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rotorwrench · 02-09-2022, 06:33 PM

These old engines don't need much compression to fire off. They just need enough to draw in a fuel mixture. If it has fuel and sparks at the plugs then I would be wondering if it's sparking at the right time. Recheck your spark timing and make sure it is at full retard. Unless it is getting too much fuel, the thing ought to pop at least once.

If your valve timing is off due to a bad timing gear, it would still have to be pretty close to have compression. Set the timing mark with the pin and look into the cylinder & see if No.1 is at TDC. It should also be blowing some air out as it comes up to the pin dimple in the gear.

Ain't these old Fords FUN!

02-09-2022, 06:33 PM	#15
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 17,410	Re: Model AA cyclinder compression These old engines don't need much compression to fire off. They just need enough to draw in a fuel mixture. If it has fuel and sparks at the plugs then I would be wondering if it's sparking at the right time. Recheck your spark timing and make sure it is at full retard. Unless it is getting too much fuel, the thing ought to pop at least once. If your valve timing is off due to a bad timing gear, it would still have to be pretty close to have compression. Set the timing mark with the pin and look into the cylinder & see if No.1 is at TDC. It should also be blowing some air out as it comes up to the pin dimple in the gear. Ain't these old Fords FUN!