D
Doug St. Clair
Guest
"The culprit:
'68 Ford 42
"The culprit:
'68 Ford 427 (Eaton) 300 HP
MSD Ignition
Autolite 4100 Carb (From Pony Carbs)
I set the timing based on suggestions from the engine shop - 34 degrees at full advance.
When the engine starts up, and when making quick little runs, it runs beautiful. It idles @ 700 out of gear, down to 600 or so in gear, and will roar up to 4000 RPMS and back again with no issues.
At some point, something "happens". There's nothing noticable to indicate it happened, like a backfire or the such. All of a sudden, when trying to bring the engine back down to idle, the thing starts to run rough and wants to cough out below 1000RPMs. It'll still run fine at higher RPM's, I just can't get it back down to idle without fighting with it.
Eventually, the problem simply vanishes. This appears to be an on-or-off situation, as there's no gradual decline or recovery of performance. I'm eyeing the carb, and have thought of ordering a Holley Marine Carb. This would obviously be an expensive "guess". Any thoughts on where to start (or continue) on this?
One other thing, which may or may not be related. The thermostat is a 160 degree version, which appears to be the only one available for this motor. Outside of the thermostat housing is a constant flow of fresh (cold) lake water. As a result, the thermostat won't pop open until around 190-200 degrees. I seem to recall this was always the case (pre rebuild), but the smell of fresh engine paint makes this a little more obvious after the rebuild. Is there a solution to getting the thing to open earlier?
Thanks!"
'68 Ford 42
"The culprit:
'68 Ford 427 (Eaton) 300 HP
MSD Ignition
Autolite 4100 Carb (From Pony Carbs)
I set the timing based on suggestions from the engine shop - 34 degrees at full advance.
When the engine starts up, and when making quick little runs, it runs beautiful. It idles @ 700 out of gear, down to 600 or so in gear, and will roar up to 4000 RPMS and back again with no issues.
At some point, something "happens". There's nothing noticable to indicate it happened, like a backfire or the such. All of a sudden, when trying to bring the engine back down to idle, the thing starts to run rough and wants to cough out below 1000RPMs. It'll still run fine at higher RPM's, I just can't get it back down to idle without fighting with it.
Eventually, the problem simply vanishes. This appears to be an on-or-off situation, as there's no gradual decline or recovery of performance. I'm eyeing the carb, and have thought of ordering a Holley Marine Carb. This would obviously be an expensive "guess". Any thoughts on where to start (or continue) on this?
One other thing, which may or may not be related. The thermostat is a 160 degree version, which appears to be the only one available for this motor. Outside of the thermostat housing is a constant flow of fresh (cold) lake water. As a result, the thermostat won't pop open until around 190-200 degrees. I seem to recall this was always the case (pre rebuild), but the smell of fresh engine paint makes this a little more obvious after the rebuild. Is there a solution to getting the thing to open earlier?
Thanks!"