Location: Mackay, Nth Queensland
Registered: June 2002
Pinging and Backfiring!?
Thu, 25 July 2002 03:31
Just a few questions,
I have a modified 18-RGEU with twin 40mm Webers, electronic fuel pump and longer duration cams fitted to an st141 corona.
when at idle it usually backfires, mostly after a hard run and also when decelerating it backfires loudly - mainly when i change to a lower gear and revs high. i've heard that i may need an rpm transducer to stop the fuel pump at high revs or is there another way? Also how can i stop the car from backfiring when idling cause it puts the beast to shame.
Also another problem is that it pings sometimes. the engine has been compression tested where the first 2 cylinders are at 120psi and the last two are at 60psi - i know these are low but am saving to fix them. could the pinging be from the type of fuel i'm using - unleaded - or has it got to do with the early detonation because of low compression?
One last question, is it possible to upgrade the carby jetters to match a 45/55mm dcoe webber to fit in the 40mm weber with a venturi size of 32mm? i've read that bigger webbers allow more fuel throughput and are suitable for high revving engines such as mine which should peak at 8000.
if anyone has any ideas or solutions please reply,
Thu, 25 July 2002 03:31
