Does anyone have any idea what the timing should be for a n/a RB30 with RB25 twincam head. I know the original engine was 15deg BTDC. This would amount to the 4th timing mark on the crank pulley. The engine still does the same revolution it just uses 2 cams to do it. Something about oil T peices on the block advance the timing by 10degs :?: I have tryed running 25deg BTDC and the engine felt rough. I have tryed running 5deg BTDC and the engine was smooth. Idle was smooth and consistent all the time. Has anyone got some theories or know :? :? :?

http://trinity.frontierisp.net.au/~rowan/twincam.htm ask this guy.

Quote: Originally Posted by carcrazy http://trinity.frontierisp.net.au/~rowan/twincam.htm ask this guy. Thanks. Lets see what I get back.