924Board.org

I just love to read this! "Pressure recovery" does feel goood.

Probably the most interesting thread for the last ten years. Thank you, sir!

IIRC my head flowed 173.5 cfm @ 0.55 but I de-tuned it later with a cam with 0.53 lift. Erland ported the intake runners ...

I might be interested in an set.

Erland IS awesome and a legend on the Speedtalk site.

Note the test he did with runners that are bent 120 degrees, then take a look at the 924 head and intake...

http://www.topplocksverkstan.se ...

What upgrade valve springs are out there for a n/a race engine?

Hmm, i wonder what springs Gegge have in his n/a build, he use to find stuff from all sort of car that fit, he isn't that frequent he ...

IIRC my CR is 11,3:1 and 95 octan works, but with a wild cam. The duration effect is significant on actual CR.

Yes, you are right. Even a forend in plastic....

Hi, I also have other interests than cars. One is hunting.

I need a synthetic forend to my old Beretta 390 and the only one I found is present on Ebay:

https://www.ebay.com/itm/124056448973

( ...

Does anybody own a digital copy of the service information 924 carrera gt?

I belive I could provide such info.

The crank is made of forged steel compared to the cast iron block.

Yes, same as Audi 5 cyl.

It was LONG, I only had time for 15 min and waited for your explaination why you prefered the earlier cars pre ´80.

For a low Cd? Check out the 924 world record car...

https://www.youtube.com/watch?v=Il5uav5bj7I

A simple log

is far from "optimized design"

That is inferiour to the cast OEM manifold I am afraid.

Try the Audi 5000 TB from the 5-cyl. Same bolt pattern and the rubber J-boot fits. The secondary is much larger.