BC

Just to clarify a few points, I wanted to state:


Quick Carl:
1.5 bar is quite a bit more than 9psi. I do believe (please correct), that 1.5 bar is way over 20lbs of boost. 9 pounds is somewhere way below .8 bar. I think that it would be a short lived engine if you used 1.5bar.

I AM interested, though, in your crank pulley design. After I have corrected you so "smart assly", would you still want to share that info?
I would appreciate that very much.
Thanks,
brendan
89S4 5spd. <img src="graemlins/burnout.gif" border="0" alt="[burnout]" />

Carl Fausett

Yes, I am developing a website to share all that I have learned. I have bought <a href="http://www.thegreatwhiteshark.com" target="_blank">www.thegreatwhiteshark.com</a> but the website isn't up yet. I have enjoyed my 34,000 original mile 78 928 - she and I won first place in our class (AP) in autocross championship points last year! Fun. To answer you questions about the difference between kinds of superchargers, and more importantly what are the main things you must think thru if you intend to s'charge a street vehicle, I strongly recommend you get and reasd the book "Street Supercharging" by Pat Ganahl. It's very helpful.I bought mine at <a href="http://www.summitracing.com" target="_blank">www.summitracing.com</a> for about $15. It has been a big help to know what kinds of problems I should expect and how to deal with them: ignition timing, detonation, intercoolers, air density, exhaust issues, heat issues, octane issues, etc.

Mike Schmidt

Aparently to make things as confusing as possible, it looks like there is no standardized way to indicate boost. 1 bar is 1 atmosphere is 14.7 psi. The problem is that sometimes boost is expressed as the amount of pressure above zero, and sometimes it's expressed as the amount of pressure above atmospheric pressure. In other words, 9 psi (.6 bar)of boost above atmospheric could also be stated as 23.7 psi ( 1.6 bar) of absolute boost. Don't ask me why it's stated one way some places and the other way in other places.

Carlos

Major kudos to Eric & his projekt 928. First legit info I've seen on 928 heads. Apparently there is substantial potential there. And a clutch, I never liked the idea of going back to the 2 disk with factory facing. It seems that heads, intake, cams & custom exhaust (competently done) cams can make an S4 stick a Z06 hunter. And this doesn't take a guy with a pointy hat, magic wand and a robe with moons & stars on it. Also it's nice to know that you don't have to pay for your engine work plus somebody's kid's college education. It's a V8, any competent engine builder working with a good head man & cam grinder can do it.

928ntslow

Looks like Eric Munck is a neighbor of mine and we had a long talk yesterday about SC'ing the early cars. I would say that this is the guy to talk to. You can reach him by visiting his site at <a href="http://www.projekt928.com" target="_blank">www.projekt928.com</a> <a href="http://www.projekt928.com" target="_blank">web page</a>

Keith <img src="graemlins/r.gif" border="0" alt="[king]" />