FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
|
#1
|
||||
|
||||
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.
__________________
67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#2
|
||||
|
||||
I'd go with the 4-in stroke. either stroke it'll be a really cool build. Good luck
__________________
My Half AN Injun..... |
The Following User Says Thank You to charlie66 For This Useful Post: | ||
#3
|
||||
|
||||
What's the CH of the pistons?
__________________
1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
The Following 2 Users Say Thank You to AG For This Useful Post: | ||
#4
|
||||
|
||||
I will have to check AG. I bought them years ago and they are in my storage unit.
__________________
67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#5
|
||||
|
||||
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.
__________________
"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. |
The Following 3 Users Say Thank You to Tom Vaught For This Useful Post: | ||
#6
|
||||
|
||||
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.
__________________
James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
The Following User Says Thank You to R 70 Judge For This Useful Post: | ||
#7
|
||||
|
||||
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
__________________
James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
The Following User Says Thank You to R 70 Judge For This Useful Post: | ||
#8
|
||||
|
||||
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.
__________________
67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#9
|
||||
|
||||
Quote:
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. |
The Following User Says Thank You to Tom Vaught For This Useful Post: | ||
#10
|
||||
|
||||
Thank you Charlie. I need to try and move this build forward.
Thank you for the videos R 70 Judge. I appreciate your feedback.
__________________
67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#11
|
||||
|
||||
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..
__________________
My Half AN Injun..... |
The Following User Says Thank You to charlie66 For This Useful Post: | ||
#12
|
||||
|
||||
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.
__________________
67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#13
|
||||
|
||||
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.
__________________
James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
The Following User Says Thank You to R 70 Judge For This Useful Post: | ||
#14
|
||||
|
||||
I recommend you get the ring lands hard coated/ Anodized -- It will really help in the long run.
|
The Following 2 Users Say Thank You to cgeise For This Useful Post: | ||
#15
|
||||
|
||||
Curt is there someone local to us to do the anodizing or do the pistons need shipped off?
__________________
67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#16
|
||||
|
||||
I would call the piston maker to see if they can do it -- just a thought
|
#17
|
||||
|
||||
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.
__________________
67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#18
|
||||
|
||||
That looks like the turbo manifolds turbo69bird developed years back. Good looking kit for a single turbo.
__________________
James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
#19
|
||||
|
||||
Quote:
Thanks, Robert
__________________
67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#20
|
||||
|
||||
Agree, they do look like them. If so, they are pretty stout pieces and will work well.
__________________
DOC'S TA Turbo 535, CV 1 heads. Built by Cerralli Competition Engines Tenth Anniversary (Van Nuys) restored. Tenth Anniversary Barn Find (Norwood) Both 4 speeds! |
Reply |
|
|