are these cam specs TBI friendly????
12-05-2003, 10:05 AM
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are these cam specs TBI friendly????
CAM SPEC'S FOR 383 HT ENGINE
Duration @ .050" Lift Lobe
Int. Exh. Int. Exh. Centerline
196 206 .431" .451" 109
I was looking at the stock TBI cam specs and these dont seem to be much different from stock. Definetely better though. I noticed that the Lobe Centerline is the same. I dont know if the that would make it harder or easier to tune but because its the same, I would think this cam should work. Am I right or horribly wrong?
Duration @ .050" Lift Lobe
Int. Exh. Int. Exh. Centerline
196 206 .431" .451" 109
I was looking at the stock TBI cam specs and these dont seem to be much different from stock. Definetely better though. I noticed that the Lobe Centerline is the same. I dont know if the that would make it harder or easier to tune but because its the same, I would think this cam should work. Am I right or horribly wrong?
12-05-2003, 12:28 PM
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Car: 2002 Z28
Engine: LS1
Transmission: 4L60E
Axle/Gears: 3.23
that cam has alot more lift and 20 degrees more duration on the intake side than the tock cam. With increased duration youll need more LSA for it to be computer friendly.
12-05-2003, 04:40 PM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Originally posted by vjo90RS8
that cam has alot more lift and 20 degrees more duration on the intake side than the tock cam. With increased duration youll need more LSA for it to be computer friendly.
that cam has alot more lift and 20 degrees more duration on the intake side than the tock cam. With increased duration youll need more LSA for it to be computer friendly.
12-06-2003, 05:22 PM
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Car: 91 rs
Engine: Carbed 355 CR 9:1 xr276 cam
Transmission: 700r4 2600 stall
Axle/Gears: 3.42
check this cam out it has close to the same specs and it is emmissond\s legal if that matters. The cam has a 116 LSA and would be very tunable
http://www.cranecams.com/master/apps...#3.%20CompuCam
It's the 4th one down the page
http://www.cranecams.com/master/apps...#3.%20CompuCam
It's the 4th one down the page
Last edited by THETANK; 12-06-2003 at 05:26 PM.
12-07-2003, 06:05 PM
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okay, so more LSA makes it easier to tune the computer? How come? Teach me please.
The cam I mentioned is the one from the HT 383 crate engine. I was thinking about buying that engine in the future but I wasn't sure about the compatability with TBI. You think a LT1 cam would work well with the vortec heads on that crate engine?
Yes i realize the heads would have to be modified to accomadate the lift on the LT1 cam.
The cam I mentioned is the one from the HT 383 crate engine. I was thinking about buying that engine in the future but I wasn't sure about the compatability with TBI. You think a LT1 cam would work well with the vortec heads on that crate engine?
Yes i realize the heads would have to be modified to accomadate the lift on the LT1 cam.
12-07-2003, 11:13 PM
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Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
One of the reasons a tight lobe seperation angle isnt desirable is the erratic vacuum signal that the computer will see. It'll cause a very erratic idle if the lobes have alot of overlap because as the intake valve is open, the exaust valve will be a little more open then a cam with more lsaand this causes the exaust gasses to revert back into the cylinder and lower and degrade the vacuum signal when the engine is out of the cams power band. A tighter lsa is advantagious because it enhances the exaust scavanging effect int he cams operating range, but it does so at the sacrifice of a smoother idle. That cams specs are pretty conservitave so it probably wouldnt be a big problem but its almost not worth doing since the durations arent much better then stock. I had a flat tappet with similar specs my 350 and with a good set of headers and a decent exaust it made for a nice ultra-low end torque setup but if your going through all the trouble you might as well get some decent durations in there. You could probably use it but at the low curb idle speed of the tbi systems youd have a funky, lopey idle. I already went through that and it gets annoying after awhile.
Last edited by dimented24x7; 12-07-2003 at 11:16 PM.
12-08-2003, 02:54 PM
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has anyone tried using an LT1 cam with vortec heads?
I did a search and found that the LT1 cam specs aren't that much different than the cam that i gave the specs for. The only big difference being the the LSA. I know the LT1 isn't a whole lot of cam but im trying to build up an engine with extremely good low end torque, that has an excellent idle and still gets decent gas mileage. I figure that the HT 383 crate with an LT1 cam, some porting and polishing of the heads, along with intake and exhaust, and prom tuning ought to result in at least 330 hp and 420 ft/lbs of torque. With the right tranny, gears and suspension, that setup should easily get into the mid to high 13 second range. I dont know about you guys but thats plent of power for me in a daily driver.
I did a search and found that the LT1 cam specs aren't that much different than the cam that i gave the specs for. The only big difference being the the LSA. I know the LT1 isn't a whole lot of cam but im trying to build up an engine with extremely good low end torque, that has an excellent idle and still gets decent gas mileage. I figure that the HT 383 crate with an LT1 cam, some porting and polishing of the heads, along with intake and exhaust, and prom tuning ought to result in at least 330 hp and 420 ft/lbs of torque. With the right tranny, gears and suspension, that setup should easily get into the mid to high 13 second range. I dont know about you guys but thats plent of power for me in a daily driver.
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12-08-2003, 03:23 PM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Originally posted by Berlinetta
has anyone tried using an LT1 cam with vortec heads?
I did a search and found that the LT1 cam specs aren't that much different than the cam that i gave the specs for. The only big difference being the the LSA. I know the LT1 isn't a whole lot of cam but im trying to build up an engine with extremely good low end torque, that has an excellent idle and still gets decent gas mileage. I figure that the HT 383 crate with an LT1 cam, some porting and polishing of the heads, along with intake and exhaust, and prom tuning ought to result in at least 330 hp and 420 ft/lbs of torque. With the right tranny, gears and suspension, that setup should easily get into the mid to high 13 second range. I dont know about you guys but thats plent of power for me in a daily driver.
has anyone tried using an LT1 cam with vortec heads?
I did a search and found that the LT1 cam specs aren't that much different than the cam that i gave the specs for. The only big difference being the the LSA. I know the LT1 isn't a whole lot of cam but im trying to build up an engine with extremely good low end torque, that has an excellent idle and still gets decent gas mileage. I figure that the HT 383 crate with an LT1 cam, some porting and polishing of the heads, along with intake and exhaust, and prom tuning ought to result in at least 330 hp and 420 ft/lbs of torque. With the right tranny, gears and suspension, that setup should easily get into the mid to high 13 second range. I dont know about you guys but thats plent of power for me in a daily driver.
12-09-2003, 02:05 PM
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im glad to hear that. As i posted before, it'll be a while before i can do this but i definetely plan on building up my car when i get out of school and have a good job. Right now, its hard to pay for mods and school at the same time. Shifty, I almost cried when i saw your website and the problems you had with that beautiful car of yours. Hope you can get it fixed.
12-09-2003, 05:41 PM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Originally posted by Berlinetta
Hope you can get it fixed.
Hope you can get it fixed.
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