| Pontiac - Race The next Level |
08-11-2022, 02:05 PM
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Ultimate Warrior
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Join Date: Mar 2005
Location: Tri-Cities WA
Posts: 1,775
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Planning turbo engine build
I have some 32cc dish pistons in a 4.25 bore diameter that I want to use. I am planning on using these pistons. My thought is on what crank I would like to use. Should I use the offering from Molnar in a 4” stroke or should the 4.25” stroke. This is not some max effort engine, but should run good.
I have my 74cc combustion chamber aluminum Kre Dports for cylinder heads. With the 4” stroke I will get 454 cubic inches at about 9.04:1 compression. With the 4.25” stroke I will have 482 CI at about 9.54:1 compression. I have the turbo manifold already set up for a single turbo. I am thinking of using s S400 or an S480.
This is not a total budget build, but I do need to spend my money wisely to get it done.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4.
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08-11-2022, 02:46 PM
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Ultimate Warrior
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Join Date: Dec 2004
Posts: 3,456
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I'd go with the 4-in stroke. either stroke it'll be a really cool build. Good luck
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My Half AN Injun.....
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08-11-2022, 03:11 PM
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Ultimate Warrior
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Join Date: Feb 2000
Location: NH
Posts: 3,561
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What's the CH of the pistons?
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1967 Firechicken, 499", Edl heads, 262/ [email protected]" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. [email protected] mph with a 1.45 60'. Still WAY under the rollbar rule.
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The Following 2 Users Say Thank You to AG For This Useful Post:
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08-11-2022, 04:07 PM
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Boost Engineer
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Join Date: Dec 2001
Location: The United States of America
Posts: 31,302
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Travis Quillen told me some years ago, that he should have gone with a 4" stroke vs a 4.25 stroke
(482 cid in their 4.25 stroke Twin Turbo engine).
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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08-11-2022, 06:03 PM
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Ultimate Warrior
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Join Date: Mar 2002
Location: San Diego, CA
Posts: 2,909
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I’m currently gathering parts for my twin turbo build. After long discussions with very smart people who have been there and done that, I will be going with a 4” stroke. The extra load on the cylinder walls with a 4.25” stroke is not worth it. Don’t worry about the cubic inches, let the turbos make the power.
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James
1970 Trans Am
Spotts Built 484" IA2, Highports, EFI Northwind, E85
Holley Terminator X sequential EFI fabrication and suspension by
https://www.funkhouserracecars.com/
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08-11-2022, 06:10 PM
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Ultimate Warrior
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Join Date: Mar 2002
Location: San Diego, CA
Posts: 2,909
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For a turbo recommendation try https://www.forcedperformance.shop/ and ask for Robert
This is a good video regarding journal bearings and ball bearing turbos
https://youtu.be/zEVEAnRdEF4
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James
1970 Trans Am
Spotts Built 484" IA2, Highports, EFI Northwind, E85
Holley Terminator X sequential EFI fabrication and suspension by
https://www.funkhouserracecars.com/
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The Following User Says Thank You to R 70 Judge For This Useful Post:
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08-11-2022, 06:48 PM
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Ultimate Warrior
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Join Date: Mar 2005
Location: Tri-Cities WA
Posts: 1,775
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Thank you so much guys. I really appreciate your feedback about Travis Tom. He is an extremely smart guy. I will jump on Johnny’s amok at buy and hope we can get a deal going.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4.
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08-11-2022, 06:49 PM
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Ultimate Warrior
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Join Date: Mar 2005
Location: Tri-Cities WA
Posts: 1,775
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Quote:
Originally Posted by AG
What's the CH of the pistons?
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I will have to check AG. I bought them years ago and they are in my storage unit.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4.
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08-11-2022, 06:52 PM
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Ultimate Warrior
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Join Date: Mar 2005
Location: Tri-Cities WA
Posts: 1,775
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Thank you Charlie. I need to try and move this build forward.
Thank you for the videos R 70 Judge. I appreciate your feedback.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4.
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08-11-2022, 07:50 PM
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Boost Engineer
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Join Date: Dec 2001
Location: The United States of America
Posts: 31,302
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Quote:
Originally Posted by quick67bird
Thank you so much guys. I really appreciate your feedback about Travis Tom. He is an extremely smart guy. I will jump on Johnny’s amok at buy and hope we can get a deal going.
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Smart enough that he is a "ROCKET MAN" for NASA these days vs a Pontiac Hot Rodder.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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08-11-2022, 08:08 PM
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Ultimate Warrior
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Join Date: Dec 2004
Posts: 3,456
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Keep us posted. I hope you figure it out to your liking . Sounds like you have most of the stuff . Even if you used a 3.75 stroke it be killer...
Im using a 3.75 in the motor im building now .. I have no doubt it will have more power/torque then ill ever need..
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My Half AN Injun.....
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08-11-2022, 08:17 PM
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Ultimate Warrior
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Join Date: Mar 2005
Location: Tri-Cities WA
Posts: 1,775
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Thank you Charlie. I have collected a few parts over the years. I just need the crank, aftermarket block, crank, turbo and figure out an induction system.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4.
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08-11-2022, 09:05 PM
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Ultimate Warrior
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Join Date: Mar 2002
Location: San Diego, CA
Posts: 2,909
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Quote:
Originally Posted by quick67bird
Thank you Charlie. I have collected a few parts over the years. I just need the crank, aftermarket block, crank, turbo and figure out an induction system.
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I’m using a Northwind with a Steve Morris billet elbow and a Wilson’s 105mm throttle body with Holley Terminator X EFI. I have thread going in the EFI tech section if you want to duplicate anything.
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James
1970 Trans Am
Spotts Built 484" IA2, Highports, EFI Northwind, E85
Holley Terminator X sequential EFI fabrication and suspension by
https://www.funkhouserracecars.com/
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The Following User Says Thank You to R 70 Judge For This Useful Post:
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08-15-2022, 01:30 PM
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Ultimate Warrior
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Join Date: Jan 2005
Location: Ellensburg,WA
Posts: 2,944
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I recommend you get the ring lands hard coated/ Anodized -- It will really help in the long run.
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The Following 2 Users Say Thank You to cgeise For This Useful Post:
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08-15-2022, 09:34 PM
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Ultimate Warrior
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Join Date: Mar 2005
Location: Tri-Cities WA
Posts: 1,775
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Curt is there someone local to us to do the anodizing or do the pistons need shipped off?
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4.
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09-23-2022, 06:52 PM
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Ultimate Warrior
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Join Date: Mar 2005
Location: Tri-Cities WA
Posts: 1,775
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A few people asked to see my turbo manifolds that I bought a few years ago. I finally was able to make it out to my storage unit to get some pictures. Here they are if you all have any more questions let me know.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4.
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09-24-2022, 01:26 PM
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Boost Engineer
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Join Date: Dec 2001
Location: The United States of America
Posts: 31,302
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Hope they PACKAGE as good as they look in your vehicle.
Have fun. Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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09-24-2022, 02:23 PM
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Ultimate Warrior
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Join Date: Jan 2022
Posts: 1,744
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If this is a factory block are you planing to fill it up to the bottom of the front timing cover water passages.
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I do stuff for reasons.
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09-24-2022, 05:41 PM
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Ultimate Warrior
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Join Date: Mar 2005
Location: Tri-Cities WA
Posts: 1,775
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Quote:
Originally Posted by Tom Vaught
Hope they PACKAGE as good as they look in your vehicle.
Have fun. Tom V.
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I have mocked them up in my car and the turbo will sit real close to where the battery used to be in my Firebird. I will weld up a support to help support the turbo on the passenger front frame rail. I have been trying to do this build for a while. I start to get frustrated and think I will just sell everything. I just keep telling myself that the parts aren’t costing me anything sitting there. Thank you for your insight Tom.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4.
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09-24-2022, 05:47 PM
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Ultimate Warrior
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Join Date: Mar 2005
Location: Tri-Cities WA
Posts: 1,775
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Quote:
Originally Posted by 25stevem
If this is a factory block are you planing to fill it up to the bottom of the front timing cover water passages.
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Hey Steve the plan is to get an aftermarket block. I figure that would be the best way to go since I already have the dished pistons for a 4.25 bore.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4.
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