[pontiacjeff]

I build custom turbo kits on anything with 4 wheels. I have always wanted to turbocharge a OHC 6. The open engine bay would lend itself very nicely for turbo mounting, piping, routing, etc. I am thinking a drawthru turbo kit from a 301 would be perfect. Anybody interested? I have four turbocharged Pontiacs myself. My '96 Bonneville 3.8L V-6 made 500whp on 20psi. The OHC engine I'm sure breathes better and should react equally as well. A stock low comp OHC would not need any mods at all.

[lemans411]

i have a ohc 6 sprint that came out of my 67 lemans and i always wanted to turbo it too just worried how much it would take. if i remember correctly the sprint engines had like 10.75 - 1 compression so it would need pistons to drop the compression down.

[Rapdron]

Jeff
I have a 67 230 cu in OHC 6 which originally was the lower compression (9.0:1) 1 bbl version that I have added the 4 bbl "Sprint" intake/exhaust manifolds to. I am going to transplant it into my 67 Lemans in place of the original 326 V8.
I chose the the 1 bbl version so I could run 93 octane pump gas.
What would it take to reliably turbo this motor for the street?
It currently has a Borg Warner WC T5 mated to a 10 bolt 3.23 posi.
It would be great to see what this 6 could do performance wise, but I'm totally lost when it comes to adding new technology to old motors.
Let me know if I can help.
Thanks
Ron

[scooter1966]

Jeff, had the same idea for some time now. i have all the parts sitting, just need time to put them together.

[TheSilverBuick]

You don't want the sprint head because the compression.

I'm in the process of setting up an EFI turbo engine. I'm working on the fuel rails and injector bungs right now on my test engine. Basically I'm going to use parts I have laying around to assemble a running MPI engine and install in a '69 Firebird so as I build my good engine I have references for mocking up and the EFI system is already running in the car. I'm starting with the sprint intake and exhaust manifolds on my test engine, but the good engine will likely have home made headers and a home made intake header with injectors near the ports. I plan on cramming boost into the engine until A) I can't keep a head gasket on it, B) I can't keep detonation at bay with alcohol injection or C) the ports back up with air to the point increasing boost doesn't do much but add heat to the system. I'm going to see what I can do, and I want to eventually run Drag Week with it. Probably a 2013 goal.


As for comparing it to your Bonneville's engine, the V6 breaths way better than a stock OHC Pontiac head. With decent porting work it could get close. The Series II heads on the V6 are a pretty good design.

[TheSilverBuick]

A thread I started on the SOHCsix forum.
http://sohcsix.yuku.com/topic/2722/m.../#.TwZdENQS3TQ

I'm just starting, and it could be a few months before I get it started up, but here is a start.

The first problem was to over come was clearing the thermostat housing and the throttlebody/carb mount. This interference just wouldn't do.




So taking a cue from Cadillac EFI systems from the 70's, and using steel lines that can be bent around problem areas I've opted to angle the #1&2 (and #5&6) injectors so they will clear the thermostat housing and give a straighter shot into the port, then injectors for #3&4 will be a bit more upright to clear the throttle body/carb.


So today I started work on the fuel rails. The parts store didn't have enough of the end fittings but they should have them in tomorrow. So I'll get the tube bender out and start working on bending up the lines to link three 4" fuel rails holding a pair of injectors each. I also have two potential fittings that may be useful on the intake manifold. i.e. a screw in injector bung. I have a jeep intake manifold to practice on drilling the intake and see how the threading works (or doesn't).

So the first iteration.


Cheaper than AN fittings and available locally.


Should be more than adequate for the EFI pressure.



Then just for the heck of it, I turned the engine upside down and looked up the bores at the bolted on head. Don't see a picture like this too often. The valves definitely fill the bore!


Kinda looks like the face of this robot or confused.

[pontiacjeff]

Originally Posted by Rapdron

Jeff
I have a 67 230 cu in OHC 6 which originally was the lower compression (9.0:1) 1 bbl version that I have added the 4 bbl "Sprint" intake/exhaust manifolds to. I am going to transplant it into my 67 Lemans in place of the original 326 V8.
I chose the the 1 bbl version so I could run 93 octane pump gas.
What would it take to reliably turbo this motor for the street?
It currently has a Borg Warner WC T5 mated to a 10 bolt 3.23 posi.
It would be great to see what this 6 could do performance wise, but I'm totally lost when it comes to adding new technology to old motors.
Let me know if I can help.
Thanks
Ron

I feel a trade coming on......

[Jeff Hamlin]

How about a 69 250 1bbl, Block is .40.
Its looking for a home/project

[pontiacjeff]

that looks cool! ^^^ But I need someones running car to build it around.

[Formulabruce]

I could see a low CR build with a turbo getting close to 30 mpg in a F body, still having lots of power!
Ill be watching this thread...

[Cammer-6]

Originally Posted by pontiacjeff

that looks cool! ^^^ But I need someones running car to build it around.

may be able to help with the car
I have a 68 bird Sprint 4 speed just itching for a "tune up"

[pontiacjeff]

Originally Posted by Cammer-6

may be able to help with the car
I have a 68 bird Sprint 4 speed just itching for a "tune up"

I need ur car and a 1bbl intake manifold. That's all nothing else. (well, 'cept some money.

[camerjeff]

Jeff,

Glad to see you are still toying with the non main stream Pontiac's!!!!! Do you still have the Grand Am you brought to Norwalk a few years ago?

[pontiacjeff]

Originally Posted by camerjeff

Jeff,

Glad to see you are still toying with the non main stream Pontiac's!!!!! Do you still have the Grand Am you brought to Norwalk a few years ago?

Hey,Jeff. i do have the TGA. I blew the engine (broke a piston) at Norwalk in 2010. I built a new 2.2 GM/Opel/Isuzu 16V with Wiseco pistons, forged rods, etc. It should make abt 100hp more with the new turbo. It made 402whp with the Stage V T3-Super 60.

My new one is a 96 Bonneville, 3800 twin-charged. Thats what got me thinking about the 3.8L OHC 6!

http://www.youtube.com/watch?v=9qGtqV9XoYY

http://www.youtube.com/watch?v=0v8PHCPAGro