Turbo for a 914..., this may work Options

[spare time toys]

Check www.ststurbo.com they put it away from the engine. I would think it would have a big turbo lag. (IMG:style_emoticons/default/huh.gif)

[Sammy]

Hmmm, I guess you've been reading different books than I have.
According to Bob Tomlinson in turbomania (a book about turbocharging air cooled flat 4 engines) he states that long duration is a negative because it allows some of the charge to go out the exhaust with no benefit. He says anything over 270 degrees is too much. Corky Bell agrees with that statement in principle. I can't say much more except I've BTDT with good results.

BTW I never, ever had a problem with the oil getting hot in the turbo and I ran it much harder than short AX laps. I never, ever saw the temp guage get near the red zone. Maybe it did for Mark, I'll have to check with him on that. Last I remember he did say that the oil temp got near the red mark during a rally in the middle of a very hot Atlanta summer. That is the only time I ever, ever heard of that engine getting hot. If he was having problems he didn't mention it.
This car did not have anything more than a stock oil cooler. Maybe if you increase the horsepower a bunch you might need an aux. oil cooler? Big surprise there, who woulda thunk? He and I discussed that very point before he bought the car. It was one of those things I eventually planned to do but was in no hurry because frankly I felt it did not need one in so Cal.

Can you provide some information to what you used to make the statements on the cam? Particularly higher duration and lobe centers as it applies to air cooled flat 4 engines. I'd be interested in reading that.

Heat generated from boost is heat of compression. Nothing more and it is not flexible. it varies only with density, humidity, etc.
Obvoisly 10 psi will generate less intake temperature than 15 to 20. I don't see your point there.

Have you driven a turbocharged 914 with a type 4 engine?

Others have done it with great sucess, they used the stock cams and had very boost happy motors.
If it works it works.
I'm a little confused at your statement that it takes too much to make a type 4 boost happy. Can you provide more details of what you think it takes?
Granted you can't make a type 4 like a twin turbo supra engine or nissan skyline, that isn't the point and only a fool would even contemplate such a concept.