LO3 rebuild (HP estimates?)
#101
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Car: 1991 firebird
Engine: TBI 305 (built)
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Axle/Gears: 4.10
Re: LO3 rebuild (HP estimates?)
Well I got a few small things done today ... Rebuilt the TB with the new injectors and FPR block off plate .. Rebuilt distributor with new cam gear, cap,& rotor ... Then I got the crank out and mic d all the journals which seem to be good I had one main journal out by .001 so I do t guess I can complain about that ... Ill have more updated tomorrow !
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Car: 1991 firebird
Engine: TBI 305 (built)
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Axle/Gears: 4.10
Re: LO3 rebuild (HP estimates?)
Got my micrometers and snap gauges in the mail Yesterday and mic d the crank and my pistons all looks good so far .. Rod and main journals were all within .001 or better and all the pistons (skirts & ring lands) were spot on perfect .. Now time to order my rings and bearings ... What is a good medium priced ring and bearing ? I was thinking king bearings and moly rings ? What kind of bearings bimetal ? Tri ? What's the pro's con's of each ? Thanks !
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Re: LO3 rebuild (HP estimates?)
Here is the micrometer and snap gauge kit I got off of amazon ! I spent a total of 150$ which is really cheap if u ever looked up te prices of starette etc. and I have to say I was extremely surprised with the quality of these micrometers for the price I was expecting some cheap Chinese junk .. But no .. These things are really good quality ... The snap gauges are a little cheaply made and were a little sticky is spots but I soaked them in oil and worked them back an forth a few times and they work great as well ! Oh and the micrometers come with their each individual spec sheet to show where in the measuring range if any they are out by .001 ... Only one out of the four were off by .001 and 1/2 the range and up to the max of the tool .... amAzon ! If u need some mics get these !
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Car: 05 P71 78 Monte 63 F100 88 S10 +3
Engine: 4.6L 383 461 310 & 355 305 2.5
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Re: LO3 rebuild (HP estimates?)
I like how tools are affordable now, 15 yrs ago was a different story for sure. my favorite tools are the ones my dad gave me as a boy, a vise and the ones i made/make myself.
I think cam choose on the 5L. is critical like no other engine, and should be done after cly. head choice, a variable cam would be the hot ticket here.
If your gona run after market heads the dual pattern cam can go out the window.
In my experience dual pattern on free flowing heads can be disappointing.
I think cam choose on the 5L. is critical like no other engine, and should be done after cly. head choice, a variable cam would be the hot ticket here.
If your gona run after market heads the dual pattern cam can go out the window.
In my experience dual pattern on free flowing heads can be disappointing.
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Car: 1983 G20 Chevy
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Re: LO3 rebuild (HP estimates?)
I like how tools are affordable now, 15 yrs ago was a different story for sure. my favorite tools are the ones my dad gave me as a boy, a vise and the ones i made/make myself.
I think cam choose on the 5L. is critical like no other engine, and should be done after cly. head choice, a variable cam would be the hot ticket here.
If your gona run after market heads the dual pattern cam can go out the window.
In my experience dual pattern on free flowing heads can be disappointing.
I think cam choose on the 5L. is critical like no other engine, and should be done after cly. head choice, a variable cam would be the hot ticket here.
If your gona run after market heads the dual pattern cam can go out the window.
In my experience dual pattern on free flowing heads can be disappointing.
#106
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Re: LO3 rebuild (HP estimates?)
The cam is 214-218 @.050 264-270 advertised .488-.495 lift plus I will b using 1.6 RR
#108
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Car: 1991 firebird
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Re: LO3 rebuild (HP estimates?)
There she be .... Hard part is over ... Now I just gotta get all the old sheet metal cleaned up and painted and save up 1200$ for my heads :-/
#110
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Car: 1991 firebird
Engine: TBI 305 (built)
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Re: LO3 rebuild (HP estimates?)
Thanks ... I'm ready to get it done ! And drive my car for 72 hours straight lol ... It's been down way too long and I need my toy/ stress reliever
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Car: 1990 Camaro RS
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Re: LO3 rebuild (HP estimates?)
Looking great.
Looking forward on how much power you are going to be making.
Looking forward on how much power you are going to be making.
#112
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Car: 1991 firebird
Engine: TBI 305 (built)
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Axle/Gears: 4.10
Re: LO3 rebuild (HP estimates?)
Yea man me too ! It prolly won't ever be dynoed but I will definitely have some track times ... If It won't pull off 8.000000000 in the 1/8th it's getting a 100 shot
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Car: 1991 firebird
Engine: TBI 305 (built)
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Axle/Gears: 4.10
Re: LO3 rebuild (HP estimates?)
Heads were ordered today ! Quick ? .. Will this bottom end hold 6000 rpm ? 6500 ? All stock .030 over .. Speed pro hyper pistons , dynamically & spin balanced , resized rods , arp bolts & studs ????!?!!!!!!!?!????
#114
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Car: 1991 firebird
Engine: TBI 305 (built)
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Axle/Gears: 4.10
Re: LO3 rebuild (HP estimates?)
Also have a summit SFI balancer and melling oil pump with king bearings and federal mogul moly coated rings
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Car: 91 Camaro RS
Engine: 355 Vortec
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Re: LO3 rebuild (HP estimates?)
I would limit it to 6K. With the cam you are running no need to go higher anyway.
#117
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Re: LO3 rebuild (HP estimates?)
Yea that's about what I was thinking on the cam redline but I may end up bumping the cam up like 1 size on duration and knocking the LSA down to 112 or possibly 110 in the near future .... Idk just depends on how well I like it .. I think I'm gonna want a little more lope at idle than the 114 LSA is gonna give ... But we will see soon .... It is also gonna get some bigger primary long tubes a new exhaust system a MSD billet distributor and possibly a small single plane intake next year
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Re: LO3 rebuild (HP estimates?)
There she b .... I guess ima have to repull my balancer that joker ain't goin on ... :-/ must have missed a burr on snout or something
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Re: LO3 rebuild (HP estimates?)
Spent 2 hrs last night trying to get the clutch splines lined up and got to thinking do I let the motor down and put bolts in motor mounts n took jack out from under trans stuck it in first gear and rocked the whole car back and forth about 5 times and kaplunk lined up pretty as u please stuck a bell housing bolt in and went to bed ! Haha never heard of anyone doin it this way but it worked like a charm !
#120
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Well I found out I forgot to put the oil pump driveshaft in a couple days ago when I went to put the distributor in .... So yesterday my buddy and I decided to TRY to pull the oil pan .... So when that didn't work I got the pan down far enough to see the driveshaft and dropped it in through the top without the collar ... Then pulled the shaft up slightly slipped the collar on dropped shaft back in and tapped the roll pin in with a punch and a baby hammer lol ... So that's done finally ... I should have this thing running today !!!!
Video soon to come !
Video soon to come !
#124
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Car: 1991 firebird
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Lol I'll try to get a video up today .... I couldn't believe how quick this thing cranked up (after I turned the distributor 180*) .... But anyway I used my old bin I was using with the stock engine I just changed my blm vs vac , increased VE by 10% just to b safe , and swapped over the SA tables from 3006 bin , .... I flashed it in and I swear the engine didn't make one complete revolution before it fired up ! .. Then it settled down to a nice smooth idle at 650-700 RPM at about 15-16 " HG .... Went for about a 30 min ride last night stopped n got 2 GAL of 110 leaded and filed her up with premium .... I really didn't get on it real hard because it's not tuned but I did about a half throttle blast and it was on 5K before I could grab a gear (tuNe is rich so no danger )
#125
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
I think I'm gonna go over my rocker arm adjustment one more again they seem just slightly louder than I'd like ... I tightened them till I couldn't spin pushrods anymore then went another half a turn .. Idk mabey these heavy valvesprings and the more aggressive cam is just naturally louder than something with stock stuff ??
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Car: 1991 firebird
Engine: TBI 305 (built)
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Axle/Gears: 4.10
Final product ..... And I have a quick ? ... I think it is my iac not sure yet .... But my iac (I think) when I first fire it up is making this horribly loud annoying whistling noise like ridiculously loud .... So my ? Is ... Is there some way I can force the iac to open slightly more after cranking so it's not right at the whistling point ? ... Like I said it only does it right after cranking for about 2 minutes then it stops ? Thanks !
#129
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Car: 1969 firebird, 1986 Trans Am,
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Re: LO3 rebuild (HP estimates?)
Sounds good. You like the ebl? I would be curious to see # or track times.
Congrats on getting it done.
Congrats on getting it done.
#131
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Car: '90 Camaro
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Re: LO3 rebuild (HP estimates?)
that thing sounds GOOD!!!
I hope theres plenty of fox bodies around to eff with
I hope theres plenty of fox bodies around to eff with
#132
Re: LO3 rebuild (HP estimates?)
Are you missing a "zero" there? If you've got a full thousandth of variation, you need the crank reground. .001 = terrible. .0001 = wonderful. You've only got a couple of thousandths of oil film, what are you going to do with a journal that's a thousandth larger or smaller?
If your micrometers are inaccurate by a thousandth, you can chuck them into the scrap bin, or use them for C-clamps.
Again, .001 = terrible; .0001 = acceptable. Plastigauge is more accurate than a mic that's a thousandth off.
Here is the micrometer and snap gauge kit I got off of amazon ! I spent a total of 150$ which is really cheap if u ever looked up te prices of starette etc. and I have to say I was extremely surprised with the quality of these micrometers for the price I was expecting some cheap Chinese junk .. But no .. These things are really good quality ... The snap gauges are a little cheaply made and were a little sticky is spots but I soaked them in oil and worked them back an forth a few times and they work great as well ! Oh and the micrometers come with their each individual spec sheet to show where in the measuring range if any they are out by .001 ... Only one out of the four were off by .001 and 1/2 the range and up to the max of the tool .... amAzon ! If u need some mics get these !
Again, .001 = terrible; .0001 = acceptable. Plastigauge is more accurate than a mic that's a thousandth off.
Last edited by Schurkey; 11-21-2013 at 01:23 PM.
#133
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Are you missing a "zero" there? If you've got a full thousandth of variation, you need the crank reground. .001 = terrible. .0001 = wonderful. You've only got a couple of thousandths of oil film, what are you going to do with a journal that's a thousandth larger or smaller? If your micrometers are inaccurate by a thousandth, you can chuck them into the scrap bin, or use them for C-clamps. Again, .001 = terrible; .0001 = acceptable. Plastigauge is more accurate than a mic that's a thousandth off.
#134
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Earlier and my stupid brake fluid reservoir is messed up and splashed fluid all over the engine ... Screwed my pretty paint all up ! Grrrr
#135
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Car: 1991 firebird
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It really sounded good open headers but that's all u could hear so I hooked up the exhaust so I could make sure there were no unusual noises coming from the engine .... I kicked her sideways Earlier and my stupid brake fluid reservoir is messed up and splashed fluid all over the engine ... Screwed my pretty paint all up ! Grrrr
#137
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Well it's running pretty darn good ... But I have a slight problem ... I have Ebl flash and I'm running into VE overflow @ 2000rpm and 80kpa that's only a 1/3 of my rpm range ! I'm @ 22psi with 68# injectors bPC vs vac @ 83
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Car: 1989 IROC-Z / T-Top -1987 GTA
Engine: 305 (LO3) _350 (L98)
Transmission: 700R4 _ 700R4
Axle/Gears: 2.73 L.S. - ???
Re: LO3 rebuild (HP estimates?)
one of the best sounding 305s i have ever heard, nice work man
#139
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Car: 1991 firebird
Engine: TBI 305 (built)
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Axle/Gears: 4.10
Thanks .. I haven't even got it over 4500rpm yet due to tuning problems ... I think it should really start to come alive about 4000- 4500
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
I hooked up my VRFPR's vacuum port last night and the VE table a are way off now .. What do I need to do to the VE table to compensate for the vacuum reference regulator ? I'm at 22psi FP with 68# injectors from CFm Tech ... Which puts me at 83 BPC vs. Vac at WOT and 121 @ 80kpa help ASAP ! Thanks !
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Car: 91 Trans am
Engine: built 360 TBI
Transmission: built 700r4
Axle/Gears: 10bolt/3.23
Re: LO3 rebuild (HP estimates?)
I hooked up my VRFPR's vacuum port last night and the VE table a are way off now .. What do I need to do to the VE table to compensate for the vacuum reference regulator ? I'm at 22psi FP with 68# injectors from CFm Tech ... Which puts me at 83 BPC vs. Vac at WOT and 121 @ 80kpa help ASAP ! Thanks !
#143
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Car: 1991 firebird
Engine: TBI 305 (built)
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Axle/Gears: 4.10
[QUOTE="thomas1976;5678562"] Copy and paste the numbers from the TBI Excell SS BPC table values in the "BPC-BPC vs VAC" table.[/QUOTE
I got it figured out thanks tho ! And sorry about the video had my phone locked in landscape mode n it made the picture tiny ftw
I got it figured out thanks tho ! And sorry about the video had my phone locked in landscape mode n it made the picture tiny ftw
#144
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Trying to get this thing tuned ! ... Anyone have any suggestions on any parameters that may need to be changed after this build ? Different heads, cam , compression, injectors, intake manifold, etc . Thanks !
Oh and this motor starts up good when the motor is cold but after it gets good an got n I try to cut it off then back on it acts like it needs more fuel or something ? Or less fuel ? Idk ? It didn't start that till I hooked up the vacuum on the VRFPR ... So it's something to do with too much or not enough fuel ! Thanks
Oh and this motor starts up good when the motor is cold but after it gets good an got n I try to cut it off then back on it acts like it needs more fuel or something ? Or less fuel ? Idk ? It didn't start that till I hooked up the vacuum on the VRFPR ... So it's something to do with too much or not enough fuel ! Thanks
#145
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Re: LO3 rebuild (HP estimates?)
Can you put together a list of what parts you used/changed? Cam, heads, and so on. That will be helpful in knowing what needs to be done in the tune.
At a minimum I would start with VE Learns. And be sure to jump on it a few times to get the rings seated.
RBob.
At a minimum I would start with VE Learns. And be sure to jump on it a few times to get the rings seated.
RBob.
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Trick flow super 23 175 cc heads .038 quench
Speed pro hyper flattops 10.5:1 compression
.030 over ore 310 ci
Summit dual plane intake with center divider cut out and 1" phenolic TBI adapter/spacer
No exhaust crossover under intake
True CAI
Aero motive VRFPR
Shorty headers & 3" system
Cfm tech 620 cfm TBI
Cfm tech 68# injectors
Autolite 3924
Under drive pulley set voltage around 13.8 pump voltage 13.8
TPI fuel pump
Howard's cam 214/218 @ .050 520/528 lift 114LSA
Driveability is actually quite good now just not quite right yet
#147
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Car: 1991 firebird
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Had the 120 mph speedometer buried today in 4th gear think I was doin about 130 or so and still had a whole gear to go :-o
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Re: LO3 rebuild (HP estimates?)
The SA tables will need to be different then the stock L03 tables. Once the fueling is more inline try the Vortec SA tables. As long as they are OK (no detonation), try them for a couple of days.
Can also try the 5.4l w/'113 heads SA tables. IIRC, they are a bit more aggressive then the Vortec tables.
RBob.
Can also try the 5.4l w/'113 heads SA tables. IIRC, they are a bit more aggressive then the Vortec tables.
RBob.
#149
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
The SA tables will need to be different then the stock L03 tables. Once the fueling is more inline try the Vortec SA tables. As long as they are OK (no detonation), try them for a couple of days. Can also try the 5.4l w/'113 heads SA tables. IIRC, they are a bit more aggressive then the Vortec tables. RBob.
Change should need changing somewhere but idk" here's a Couple pics for ya RBob
Low speed keeps getting This little "dip" where the dot is
And here is high speed after a VE learn today smoothing factor of 3 I think ....
VE was gettin a lot better as far as how it's been running but I flippin ran into VE Overflow again today at 1400 rpm and 90-100kpa .... I'm seeing 23PSI fuel preassure at WOT and no lower than 13-14 psi at idle