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3100 motor (what to grab before scraping)

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Old 07-27-2009, 07:40 PM
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3100 motor (what to grab before scraping)

Ok guys i have a 96 buick skylark with the 3100 series motor in it...i know the preferable 3x00 swap is from a 2000 up...but i have this in my driveway...it did run and is well free lol...below will be a pic of the motor...i need to know everything i should grab off it before i scrap the body...im thinkin of using it in the future as a 3x00 swap...or maybe this winter idk yet...either way what do i need to safe...its all there and complete so id like to grab as much as possible before i scrap it...i do not have a cherry picker or else id grab the whole motor...plus i have no use for the bottom end so i will leave that in the car(more weight for weight in)...here is a pic...

Old 07-28-2009, 03:13 PM
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Re: 3100 motor (what to grab before scraping)

bump...come on...i know alot of people have done swaps on here
Old 07-28-2009, 04:11 PM
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Re: 3100 motor (what to grab before scraping)

Originally Posted by mtwlkn122
bump...come on...i know alot of people have done swaps on here
Actually I don't know of any 3x00, put in a 3rd gen, that have actually been completed. Most people are all "gung ho" about it, buy a bunch of parts, find out that there is a lot more work in the swap than they had thought, and scrap the project. There are only a hand full of us that are still crazy enough to actually continue on after that point...but to my knowledge none have finished yet.

But anyways...what you'll need to take is the pistons/rods and everything from the heads up (to be on the safe side). You'll need a lot of the wires/sensors/other misc stuff.
I am personally only using used heads, LIM, and UIM. Everything else I have pieced together and bought new. Maybe one day Ill make a list of every part with part numbers and prices.......and become depressed when I see the total
Old 07-29-2009, 01:40 PM
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Re: 3100 motor (what to grab before scraping)

923.4v6's car has been complete and running for some time now

But yeah, there's a lot more 4th gens with them than 3rd.
Old 07-29-2009, 02:03 PM
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Re: 3100 motor (what to grab before scraping)

lol...ya i know alot of ppl talk about it...including me...i just figure hey its free and its in the driveway so mind as well pull what i might want in the future....but ya all the lil things involved is what holds me back...but of course if this was a simple bolt on everyone would be doing it, and i like to be different just like you guys


...just wanted to say the turbo project is on hold right now...i went and talked to my mechanic today and he said i have to pass emissions...well only the visual emissions that is...seeing how i want to still drive this on the street i need to have "orgininal emission equipment" all in the car....he is a cool guy and told me what to do to pass without it "being there" lol...but it sucks cause now i cant just dump the egr, air pump, and so on to make extra room and run custom front facing headers....so now im at a stand still on that project...He told me all orginial equpiment has to be there. It doesnt have to work but has to visually be there. So of course i told him hey what if i just put it all in a plastic bag and put it under the hood does that count...he laughed and said well sort of....he says i should just mount it where i have space and not hook it up/gut it all. This way its there but not really...this pisses me off cause i really wanted to just get rid of all the unnessary things!...i HATE NEW YORK....trust me ppl New York sucks, DO NOT MOVE HERE...taxes, gas, governers, emissions, cops, and so on are all F***** REDICULOUS! I looked at movin to flordia but at 19 um ya its not in my pay grade. I would still love to come visit FirstFirebird's shop and see his car and project.

Ok enough rambling...well Grimmcs when u get a list i will just look at that thread and save it...until then ill just pull anything from the heads up and save what i think ill need
Old 07-29-2009, 03:56 PM
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Re: 3100 motor (what to grab before scraping)

Originally Posted by firstfirebird
923.4v6's car has been complete and running for some time now
Wow...I didn't know he had finished. I havent really been paying too much attention to things lately. Ill have to find and read up on his progress.


Originally Posted by mtwlkn122
only the visual emissions that is...seeing how i want to still drive this on the street i need to have "orgininal emission equipment" all in the car....
Im in the same boat. I don't have the sniffer test here...but everything that was stock, emissions wise, has to be on the car and in working condition. Obviously I'm not worried about it...there are only a few old F-Bodies around here so, if I were to go to a shop, the mechanics probably wont notice all the engine work and things missing...and its good knowing guys who own their own shop...............
Old 08-02-2009, 09:27 PM
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Re: 3100 motor (what to grab before scraping)

Originally Posted by mtwlkn122


...just wanted to say the turbo project is on hold right now...i went and talked to my mechanic today and he said i have to pass emissions...well only the visual emissions that is...seeing how i want to still drive this on the street i need to have "orgininal emission equipment" all in the car....he is a cool guy and told me what to do to pass without it "being there" lol...but it sucks cause now i cant just dump the egr, air pump, and so on to make extra room and run custom front facing headers....so now im at a stand still on that project...He told me all orginial equpiment has to be there. It doesnt have to work but has to visually be there. So of course i told him hey what if i just put it all in a plastic bag and put it under the hood does that count...he laughed and said well sort of....he says i should just mount it where i have space and not hook it up/gut it all. This way its there but not really...this pisses me off cause i really wanted to just get rid of all the unnessary things!...i HATE NEW YORK....trust me ppl New York sucks, DO NOT MOVE HERE...taxes, gas, governers, emissions, cops, and so on are all F***** REDICULOUS! I looked at movin to flordia but at 19 um ya its not in my pay grade. I would still love to come visit FirstFirebird's shop and see his car and project.
Save the front cover and pullies (but not the water pump, get a new one), the power steering pump, possibly the DIS stuff, and the engine mount/lifting eye brackets (but dump the remaining mounts on the front head). It might be a good idea to save the alternator as well just in case the case halves have different mounting bolt locations.

You can probably get away with saving your stock dished pistons, but keep the 3100 set just in case. FYI, the 3.1 has a lower CR than a 2.8 (8.5:1 compared to 8.9:1, as taken off of the Tech Data pages), so, without much knowledge of just how different the 3100 and 3.1 pistons are in terms of dish size, I would think that there wouldn't be much of a difference, unlike going from the flat-top 2.8 pistons.

You can keep your EGR valve, you just have to make sure they're the same. Junk the exhaust parts. All of them. The pipes are no use to us as they will hit the firewall in the back.

As for the emissions stuff, I know it sucks. You just need to know someone with a current NYSI card.

Don't know about Florida... I would hate to have to run up here every hurricane season just to make sure my car is safe...

I have a set from a 98 Malibu in my garage mounted to a 2.8 block I picked up last year, waiting to be cleaned and painted. I plan on trying to get rid of the upper plenum and making a new one so I can keep my dizzy... I'm not really thrilled with the fact that I'm going to have to find a way to use a CKP sensor, and I would just rather keep my intake close to the way it is for the moment, while avoiding the top of the PS pump... Plus, it would be different.

Last edited by Maverick H1L; 08-02-2009 at 09:41 PM.
Old 08-03-2009, 11:44 AM
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Re: 3100 motor (what to grab before scraping)

Thanks for all the help guys...and ya idk what im going to do now cause of inspection....i do know a guy but he is kind of on the fence about the whole thing....i mean i only need to pass visual so all he would have to say is "ya its there" and ill slip him extra...we will see what i can do...As for now i just say a picker and a stand go on sale at HarborFreight so im thinkin about pickin both up for this comming winter projects...i need to get a picker anyway cause i want to go through the firebird motor anyway...i was planning on spending that money on headers and a heated o2 tho...oh well tools are future investments headers are not nesscary at this point in my build...ok enough rambling on...ill keep you all posted as to what i do...

Anyone intressted in a 96 buick skylark and a 95 bonneville with the 3.8 series motor in it? lol
Old 08-05-2009, 01:36 PM
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Re: 3100 motor (what to grab before scraping)

If you read some of the other posts regarding this, youll need the heads, intake, fuel rail, part of the lines coming off the rail, pistons for sure. If you keep your pistons youll be running like 13:1 compression or something crazy like that. search around for any of the 3x00 swaps and youll find what you need to keep from it.
Old 08-05-2009, 01:43 PM
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Re: 3100 motor (what to grab before scraping)

:edit: Brain cramp forming on this one... I'll just back out of the piston deal. However, to yank the pistons, it's going to require the use of a ridge reamer, an expensive tool to only be used twice or so, once for each engine.

Last edited by Maverick H1L; 08-05-2009 at 02:33 PM.
Old 08-05-2009, 02:41 PM
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Re: 3100 motor (what to grab before scraping)

2.8 Iron head volume ---> 48.5cc
2.8 Iron piston volume ---> 0.0cc
(later style 2.8)
---------------------------------------
3.1 Iron head volume ---> 48.5cc
3.1 Iron piston volume ---> 12.0cc
---------------------------------------
3.1 Aluminum head volume ---> 26.4cc
3.1 Aluminum piston volume ---> 26.4cc
--------------------------------------
3100 Head volume ---> 26.4cc
3100 Piston volume ---> 28.6cc


These are the stock numbers taken from 60V6 CR calculator.

:Edit: I never used a ridge reamer on my engine when I dismantled mine. I don't think that the 60*s had a ridge on them...or at least the later ones.

Last edited by grimmcs; 08-05-2009 at 02:46 PM.
Old 08-05-2009, 04:54 PM
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Re: 3100 motor (what to grab before scraping)

Just for your info, the 3100/3400 heads and a 3.1 will have less than 12:1 (11.88 to be exact) using the RWD .040" head gaskets. You can drop that a few more points by using the FWD .060" gaskets, but then you have to worry about a huge quench area (.077" to be exact), and still will have 11.14:1.

The FWD heads are extremely efficient. The 3500 head have been used with the DOHC 5cc dish pistons and is running on pump gas, but I wouldn't suggest that high CR unless you already have a grasp on tuning. The car I'm talking about has 12.6:1 or so, 3400 with DOHC pistons, 3500 heads, BIG cam and other goodies. He lives here in FL
Old 08-05-2009, 09:22 PM
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Re: 3100 motor (what to grab before scraping)

:Edit: I never used a ridge reamer on my engine when I dismantled mine. I don't think that the 60*s had a ridge on them...or at least the later ones.
The ridge is from bore wear.

Skip the timing cover, it's a pain in the a$$ to get out in the car and you can't use it with a stamped pan. You'll need to do a little trimming to the rwd timing cover to get the fwd manifold to fit. Get the oil pump drive as well, you'll need it to plug the dist. hole and oil your engine.
Old 08-09-2009, 06:55 PM
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Re: 3100 motor (what to grab before scraping)

:facepalm:

I've NEVER used a ridge reamer to remove pistons from an engine, and I've taken apart a LOT of engines. In fact I don't even OWN a ridge reamer. Besides, you use a ridge reamer AFTER pistons are out to cut the ridge off, not before. The shavings that would be formed would get down into the space between the piston and cylinder wall scoring the cylinder when you actually remove the piston, VERY bad idea to use it before removing the piston.
Old 08-09-2009, 07:55 PM
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Re: 3100 motor (what to grab before scraping)

ok well my plan to have the crap cars out of the driveway hasnt happened yet...a few set backs(Dads house plumbing, working on apartment, and major brake failure on my car)...so i havent even gotten to touch the car yet...thank you everyone for the lists and so on...im going to buy a picker and stand cause i want to pull my motor and make sure its all tight and def put new gaskets on everything and clean/paint the motor...i take it to shows and if im popin the hood i want the v6 to at least look good lol...as for the 3100 i will prolly just yank the whole motor and wire harness and so on...ill prolly sell the tranny as it worked great and then after i pull what i want from the motor sell what i dont use...i know im going to get yelled at for having yet another "junk pile" stored in the garage but w/e...some ppl have hobbies of making kids, while i have the hobbie of modding cars

...i know its not the place to advertize it but if anyone wants parts or the whole car i plan to get rid of the 96 skylark(minus motor and tranny) and the whole 95 bonneville...bonne needs a lil tlc on the outside but it has the 3800 fwd in it...its a pretty fast lil car...plus its all black leather(and very nice still, i might keep the seats idk yet)....either way pm if you want either of them or both...i will sell CHEAP...i just need them gone!
Old 08-10-2009, 11:42 AM
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Re: 3100 motor (what to grab before scraping)

Originally Posted by bl85c
The ridge is from bore wear.

Skip the timing cover, it's a pain in the a$$ to get out in the car and you can't use it with a stamped pan. You'll need to do a little trimming to the rwd timing cover to get the fwd manifold to fit. Get the oil pump drive as well, you'll need it to plug the dist. hole and oil your engine.
The timing cover could be used with a stamped pan, but in a RWD application, it would be more problem than it's worth, not because of the oil pan, but because the waterpump passage and power steering pump location interfere with turning the intake around to face forward in the RWD application.
FWD hybrid builders use the genIII front cover with the genII pan all the time, and I'm quite sure that the flange at the front cover is the same between the FWD and '86+ RWD pan.
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