Might be a dumb question...but here goes!!!

Bobs85PU

Well-Known Member
As most of you know, I'm more an air-cooled VW guy, than a Chebbie guy...Although I do own my 85 Chevy Pickup, with a Vortec 350, Edelbrock Intake and 600 CFM Carb, Headers and an HEI Distributor.

This question concerns the VW engine I'm building.....

I realize you can back off on the specs for a cam in a turbocharged engine...The turbocharger does it's thing, so you can run a less radical cam.

When dealing with an Air-Cooled VW engine, you HAVE to run a much lower compression ratio, than with a Water-Cooled engine.

As the car this engine will be used in, will be a street car...NO drag racing...And the engine will have approx. 7.5 to 8.0 compression...Can I up the specs of the cam, to make up for the lack of compression?

I can supply the specs of the engine (bore, stroke, distributor, valve sizes, carbs, the cam I'd like to use, turbo specs, deck height, head cc's, etc, etc).

I'll be running 91-93 octane gas...NO racing gas.

This post is nothing more than a thought provoker...
 
ITS NOT A DUMB QUESTION, its a darn good question!
turbos have a rather unique exhaust timing and exhaust pressure curve requirement, a standard non-turbo cam design will work but its not ideal.
turbos generally want a wider LSA and a shorter exhaust duration than a non-turbo cam



related info, links and sub-links that should give you a good bit of info


http://www.dune-buggy.com/turbo/enginebasics.htm

http://minimopar.knizefamily.net/perf/turboinfo.html

http://www.max-boost.co.uk/max-boost/cylhead/cams.htm

http://www.actionimport.com/Tech_Files/ ... mation.htm

http://www.turbochargerpros.com/turbopa ... arger.html

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Hey Grump, sorry I hadn't replied sooner!!!

I've been reading much of the info on the links you provided.

And, I found this book:

Turbomania.jpg
 
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