Jimmy2222

iTrader: (3)

Hey guys, just curious, no real meaning to this post. But, has anybody ever messed with exhaust ports on a Renisis? They are side ports, would you be able to do a bridge on the exhaust side?

pluto

you shouldn't bridge the exhaust port because of the exhaust sleeve

Chuck Norris FB

I have been thinking about this as well,but i think it's preferred to port the side exhaust in a downward direction too open it sooner. there is plenty of meat to do so,however doing a exhaust bridge would make the engine lose it's zero overlap
Characteristics and may lose H.P

Jimmy2222

iTrader: (3)

Yeah, thought exhaust would be interesting on these. For a high revving N/A motor, would peripheral port's be preferred or would side ports perform better?

Chuck Norris FB

Are you referring to the intake or exhaust ports? of the renny.

Jimmy2222

iTrader: (3)

Just in general for high revving application rotaries

ArmyOfOne

iTrader: (12)

It may look as though there is a lot of meat to port down but what you dont see is that there is a water passage running through that meaty piece. And as for BP on the exhaust it will quickly overheat the bridge and it will crack at the most inopportune time. There is some porting but exhaust is a very touchy part of the system for this engine.

rotarygod

iTrader: (1)

You can't bridge the exhaust port of a Renesis. The water jacket is shaped very weird here and believe it or not extends between the exhaust sleeve and the face of the housing in this area. It is only an 1/8" wide or so but it is there. If you try to bridge port it, you'll cut into the water jacket. Due to the shape of the water passages, even porting the exhaust ports larger results in cutting into it. Guess how I know! You can do very little to the Renesis exhaust ports as a result and are pretty much limited to just slightly radiusing the edges.

The Renesis engine that I ported a few years ago was a big learning experience and I did ruin one housing cutting into the water passage. Most of the port work gets done to the primary intake ports with only a bit of cleanup on the rest. That engine didn't make tons of power over stock but it did make noticably more average power than any other Renesis I've driven with a bit more peak. Don't expect 30 hp gains or anything though. You won't get them.