Propane timing

[sharpshooter]

What timing do most run with propane,I have a 355 sbc all msd electronics

 

[TOMMY RAINS]

it depends on compression and your cam we run between 30 and 40 degrees on our motors

 

[sharpshooter]

I have very mild comp. with an rv cam Iam running 30 now,but I cant get rid of a bottom end miss or pop,runs great on top

 

[sharpshooter]

Damn propane likes timing,put mine at 37 and it runs great,before hand it would fall off at about 3000 rpm,is this normal for propane

 

[patooyee]

Yes. Propane burns slower than gas, therefor you must initiate the ignition cycle before you would with gas so that the cylinder reaches peak pressure at the correct time / relatively same time as gas would. If you start it too late the piston will be running away from the flame and result in poor torque / performance / low cylinder pressure.

J. J.