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onfire
New member
Username: onfire
Post Number: 1
Registered: 11-2004
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, November 26, 2004 - 10:35 pm: |       |
I am looking to rebuild the engine in my 93 suburban. I want a 383 rotating assembly any recomendations. Also here is a list of parts I have compiled for the top end.
Chevy Ram Jet, 196/206 Duration @ 0.050, Hydraulic Roller Camshaft 14097395
SB Chevy Hydraulic Roller Lifter Kit 12371042
2nd Design SB Chevy w/ Roller Lifter Pushrod Kit
Part Number: 12371041
HP TBI SB Chevrolet Cast Iron Cylinder Head
Part Number: 10125377
Any power guesstimates. What about reprograming the computer?
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bogie
Intermediate Member
Username: bogie
Post Number: 137
Registered: 8-2003
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, December 17, 2004 - 3:59 pm: | |
First off the basic question is what are you using for a block? A 93 Suburban engine probably doesn't have a roller cam and in all probablility the block doesn't even have the provisions for a GM roller cam. To use GM parts the block must have the lifter bores raised .6 inch taller than a non roller block to accommodate the rather long GM lifter. The valley area must have three cast bosses over the main oil galley to support the spider that retains the lifter alignment bars. Lastly the timing case of the block needs to be machined for the thrust plate required by the factory cam. A block lacking these provisions requires the use of aftermarket roller cam parts. That will preclude most everything you have obtained thus far.
The cam selection is pretty mild. The 10125377 is the cast iron L-98 head. It suffers the same problems as its aluminum cousin with porting issues, it's basically the same as your Swirl Port heads without the vane. The compression on these heads is a bit high for cast iron on a 383, they will probably require premium fuel of 92 to 94 octane with this cam. You'll need a "D" dish piston see Keith Black at http://kb-silvolite.com/performance.php?action=start for a selection. This can require some thought as there's a lot of pistons here. You need to coordinate the pin retention method to you rod selection with one proviso, if you have rods intended for a press fit pin then you don't have worry about pistons with designations for floating or press wrist pins. A rod that uses a press fit piston pin works just fine with a floating pin piston as the retention is controlled by the rod. The purpose of the "D" shaped dish is to present the flat decked part of the piston to the squish/quench deck of the head as close to each other as is mechanically practical. Compared to a full dish piston this allows more compression and detonation resistance through greater turbulance and greater quench surface to volume ratio. This is mechanical octane!
You will have to put a custom chip in the computer as this is about a 70 horsepower gain and the TBI computer just will not stretch further than about 20 without a new brain. See these people:
http://www.fastchip.com/
http://www.hypertech-inc.com/
http://www.superchips.com/
http://www.kcspeed.com/
http://www.jetchip.com/
The stock TBI will prove to be inadaquate at feeding this engine at minimum it will require a larger capacity injector, you can find these at Holley, but in all likelyhood the air capacity will also be insufficient this can be handled by having your unit bored to 2 inches, see these guys; http://www.turbocity.com/ . Or you can use a GM unit from a 454 or a Holley 502-6 see them at http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSFI/FMSFI.html
Chips are expensive, the chip you have made needs all the engine perameters of the finished configuration. The build has to happen all at once you can't creep up on it with one improvement at a time. The chip has to go in the computer when the engine goes into the truck.
The 383 will want a lot more exhaust system, not just a CATBACK but everything from the manifolds aft. This can be a problem with the SMOG people. This also needs to be defined to the guy that blows the chip.
The final engine using what you've outlined would be capable of about 280 to 300 horsepower SAE Gross at the crank on a dyno. Lots of torque, but without more cam, TBI capacity, and exhaust capacity it will run out of top end very early so although you have more cubes than the 12353641 350 crate engine (which in several respects is essentially what you're building), I wouldn't expect any more horsepower; torque yes, horsepower no.
Bogie |
snipescastle
New member
Username: snipescastle
Post Number: 1
Registered: 2-2005
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, February 26, 2005 - 2:58 pm: | |
Hey Guys!
I have a similar question to this topic, I want to swap a 350 c.i. roller engine with the ZZ4 Cam & 305 heads while using TBI intake and electronics, I know I must use a chip to allow the computer to work with this cam.......I heard it will "Freak Out" any ideas on what I should be looking for in a chip or who I should talk to? I'm not a programmer and don't tinker with fuel mapping or timing curves, if anyone could point me in the right direction, I would be greatly thankful!
Thanks in advance!
Ben Smith |
spinup
Junior Member
Username: spinup
Post Number: 38
Registered: 1-2005
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, February 27, 2005 - 5:59 pm: | |
Try Brian at: http://www.tbichips.com
He specializes in TBI stuff. Good prices too. |
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