Blew my engine. Anyone here build a 3.8 or 4.0?

[Gilles]

Originally Posted by Jake Raby

Loaded question, with way too many potential variables for a general answer.

The crankcase for the Carrera S is not special, its the same as your M97.21 in most every way. It has larger diameter cylinders from the factory, but we never care about that.

You have one chance to do this right. Learning curves are 90 degrees and margins of error are near zero. This is why I offer classes.

I always stick with the M# designation that the vehicle came with, unless its a crazy project with no budget or time constraints.

Jake,

I am sorry perhaps I was not clear enough, I was referring to the strength of the 3.4 crankshaft because I was considering going to the 3.8 Nickies with the forged rods and was not sure if the crank would be the weak point.

Regarding the learning curve, I have assembled a few aluminum (Italian and old VW) engines but by no means are an engine expert, but I am planning to attend your M96/97 rebuilt class, hopefully before this years end, thank you for your comments!
.

[Jake Raby]

Originally Posted by Gilles

Jake,

I am sorry perhaps I was not clear enough, I was referring to the strength of the 3.4 crankshaft because I was considering going to the 3.8 Nickies with the forged rods and was not sure if the crank would be the weak point.

Regarding the learning curve, I have assembled a few aluminum (Italian and old VW) engines but by no means are an engine expert, but I am planning to attend your M96/97 rebuilt class, hopefully before this years end, thank you for your comments!
.

The only remaining enthusiast class is in December, and its mostly filled. I just finished the training site, so you can go there for details, and to sign up.
The Knowledge Gruppe

The factory crank is fine, just ensure it is magna flux tested, and that you do NOT use a lightweight/ single mass flywheel.

Its the little things that bite you with these engines. My classes are all about "silver bullets" that help avoid issues.