I was thinking something for the last couple of days, and it hit me when I was staring at a picture of a rotar for the engine. Is it possible to make that groove(bowl?) a little bigger to eek out some more displacement? If so, what would happen? I'm looking for positive and negative results here, because to be honest, I've got nothing better to do... and I'm ordering a pair of lightweight rotors soon, so.... ;> Any help here would be appreciated.

that would just ruin your compression, and balance unless it was perfect

what about the compression on a turbo engine? if they were balanced perfectly wouldn't this be a big improvement in power? maybe ito will have another field to master...

That stuff is unheard of, people just add more rotors.

My uncle is a machinest, and with equipment he has access to, it really shouldn't be hard to do. I expect it's going to take a day at most per rotar, and like I said, I have nothing better to do, so I'm going to give it a try. I'll post the results in a few days. The way I figure, it's going to help the powerband all the way to redline, and the worst case, I might just launch a piece of the rotor through the block. Either way I'm curious about both. Here's how the rotar faces will look like.



______ ______

\______/ (this is the normal looking 'bowl'



________ ______

\__ __/

\_/ (this is what I'm aiming for)



Wish me luck

Oh hell, the diagram didn't work :P Anyway, what I'm trying to do is add a second bowl in the middle of the larger bowl at the bottom. Hope that clarifies it.

wont that just lower the compression?



mike

it'll actually make less power all the way to redline unless you boost the **** out of it.

The way Mazda bumped up the displacement from a 12A to a 13B was by making the rotor and rotor housing 10mm (I think) wider. Messing with the "bowl" will just screw up your compression ratio.

Yes, he is right..

if you want a nice powerband..... why dont you just use high compression rotors..... that way you'll have a lot more low end power, and spool up your turbos quicker

Yeh, what he said https://www.nopistons.com/forums/pub...IR#>/bigok.gif

i'd also be concerned with the thickness of the rotor on that face, remember that they are hallow and have to tolerate some high pressures.



perhaps changing the shape of the dish would have some benefits, but making it deeper i'm not sure about. At least you'd be removing some weight, but hurting compression at the same time.



if it's an NA i'd say probably pointless, turbo and it might be interesting since you can make up for less compression with more boost.

lots of fuel needed for that, but it can be done

Okay, I'll just save the rotors until I need them in the future. If I were to use high compression rotors on a turbo engine, what would be the main problems associated with that? Will detenation be more frequent?

the 12a's have a different chamber shape, it tapers on the trailing side.



mike

to use high comp rotors with boost you need to tune really well, or you'll blow the engine