what's the weaknesses of the renesis motor?
 

I know there are some parts that are better in it, like the e-shaft, but what are the weaknesses of that engine vs. the 13brew?

Why do you have such an eccentric shaft fetish?
How about the high compression rotors? Or the stronger 2-piece seals?

Maybe it would be easier if you just asked what isn't stronger on the Renesis, like the tiny exhaust ports.
That is all that comes to mind.

just curious ... is this for your curiosity or do you have a specific question in mind?

"stronger" is really pointless because both engines do what they were designed to do very well - especially in the context of time.

I think there is a blurring of the ideas here of a weak output and a weak design, neither of which are the case, especially in the correct context.

exactly!

i understand natural progress and Renesis fits that bill to a tee, but some of the stuff i read, with people looking to better the REW's game makes me think that there is, indeed, a blurring of ideas, or rather, ideology.

I would think the research and development still has some room for improvement. You dont get much power from bolt on parts on it from what I hear. Its a great NA engine as it is, but peak power of the older 13's seems to be a little better with all the different ports, but probably without the powerband of a renesis.

BTW has anyone built a lower compression boosted renesis? I would like to see the results on that. Ive been hearing mixed results with the stock high comp renesis with bolt on turbo kits

not likely to happen. from what i've read, there is an interference issue with the side seals (i think it was the side seals) and the Renesis exhaust ports. so the only lower compression, at this point, would be someone machining Renesis rotors to accomplish it.