Building up the old gal

[6inarow]

Been searching for the limits on the n55 m235i crankshaft, and my builder is saying the crank needs to be stronger for the power goals I have(800whp). The s55 crank is a different part number, but has anybody used it in the n55 for a high power build? The block has a block guard, forged rods and pistons, race bearings, yadda yadda. Wondering if my recipe is going to hold this power without changing the crank.

Thanks for the advice, and comments, trying to get a better picture of what these engines are capable of.

 

[wheela]

Have you seen this video? He's running 750whp on a stock engine m235i.

 

[6inarow]

Have you seen this video? He's running 750whp on a stock engine m235i.

Very good video to watch, a lot of good information. I’m throwing nitrous at this engine, using a shuenk n55+ turbo on 93. It makes 480wheel, and then I’m building a port nitrous kit for a 2 stage setup. 100 first hit, second stage is another 100. The hit is going to be hard on the bottom end, even with a progressive controller. There are some who say the s55 crank fits, and those cranks hold tons of power. the bearings are the same from acl and king, N/S55.

 

[6inarow]

Btw if people are curious of the crank fits, you he answer is yea. Perfect fit, and 6 pounds lighter.