timming at idle

blackcat · Post by **blackcat** » Sat May 08, 2004 7:27 pm

Just recenlty spun my 1 and 4 rod bearing due to detonation possibly due to bad timming at full throttle. Was using a stage two on turbo charged d16y8 with forged internals not sleaved. Damage occured at 9.5psi on the dyno as it was being tuned. This was a retune after second rebuild because of piston slap problems casued by over cut bores. Stage two is being upgraded to s200 for this rebuild. I did notice that before the dyno runs that my timming at ilde after the motor was warm would not stay at 16 degrees which is what i was trying to set it at. It would fluctuate between 18 and 14 degrees on it's own. I thought that it was due to tunning which is why I took it back to be retuned. My question is does anyone know why my timming was not stable and is this the reason that I spun bearings. i literally cannot afford to damage my motor like this again so i need to find out if this is just bad tuning or do I have a probelm somwhere in the car possibly the hondata. Would appreciate any ideas that anyone might have.

CivicVTi · Post by **CivicVTi** » Sun May 09, 2004 8:47 am

This is normal. The timing is not stable and it is not identical to the table maps as the ECU takes into account many parameters to define timing (table value, water temp, air temp etc, AF ratio etc)

blackcat · Post by **blackcat** » Sun May 09, 2004 4:45 pm

I understand that but it's fluctuating right before my eyes. As I'm aiming the light at the marks on the pulley I watch the white line move back and forth. It wasn't like that before and I've never seen it like that on any other car. Also when it moves I can here lopes coming from the exhaust exactly when the timming moves. So I know that the timming moving like that is not normal otherwise it wouldn't do that.