930/02 receipe for HP

[77Targa0912]

In the next few months I will be diving into a full restoration on a '77 Carrera 3.0. From my research it seems this motor can be improved some from it's factory specs.

I want to retain the original CIS.

Can I improve the compression ratio?
Is there a mild cam to work with CIS?
Is an early SSI system too restrictive?
Which muffler (2/1, 2/2) would increase horsepower and give me a small sound improvement?

My local machine shop has a unique flow bench tested and dyno proven 911 valve job that will give me around 20hp.

Is 230-240 crank Hp realistic?

Thanks!

[77Targa0912]

No one?

[Steve@Rennsport]

Originally Posted by 77Targa0912

In the next few months I will be diving into a full restoration on a '77 Carrera 3.0. From my research it seems this motor can be improved some from it's factory specs.

I want to retain the original CIS.

Can I improve the compression ratio?
Is there a mild cam to work with CIS?
Is an early SSI system too restrictive?
Which muffler (2/1, 2/2) would increase horsepower and give me a small sound improvement?

My local machine shop has a unique flow bench tested and dyno proven 911 valve job that will give me around 20hp.

Is 230-240 crank Hp realistic?

Thanks!

There are many possibilities so the very first question I ask potential clients is: "Whats your maximum budget?" as thats what frames my answers. While its fun to discuss various options, there is no point in such things if one simply lacks the resources to employ them.

CR can be bumped with custom pistons. This may not be the best option if you expect 100K+ from the rebuild

You can use a 964 grind cam with CIS.

SSI's with a GOOD sport muffler is just perfect.

With all respect to your machine shop, no valve job adds 20 BHP to a CIS engine. The limitation here is the CIS and mild cams, not the heads.

220-225 BHP is possible with a 3.0 Carrera if its properly assembled and tuned using good gas.