HMSS013

i had to start a new thread rather than jack the other timing thread... that and i got to page 5 and everyone was still arguing... i couldn't make sense of half of it.

what is a reasonable advance to use to improve performance on a stock 12a - nikki w/o rats nest... and what are the risks of detonation... will the advance make my engine run cooler? ... and what is the preferred method to adjust the timing. I've been working on these cars for years but i truly am clueless in this area.

Rx-7Doctor

iTrader: (13)

Get past page 5 of that thread. Everything you need to know is covered in that thread.

HMSS013

okay.,.. made it to page 12... still just a bunch of arguing...

REVHED

Paul Yaw recommends 24L and 16T. This is total advance at wide open throttle.

To do this you mark the pully at 24* and 16*. Five degree increments works well. The pully is exactly 360mm in circumference so it's easy to do. To set the timing you need to disconnect the vacuum advance and rev the engine to about 3000rpm so it's at full mechanical advance.

David Dewhurst

iTrader: (2)

HSMMO13, go to yawpower.com & read everything you would like to know about timming the rotary motor including the whys..................

trochoid

iTrader: (6)

NA rotarys will very rarely detonate and cause apex seal damage. Turboed engines on the other hand will due to the increased combustion pressures.

Kentetsu

Well, a NA rotory will detonate if you advance the timing too far (sounds like marbles rattling around inside a coffee can), but it will rarely do any damage unless it is long term.