Re: Probably ruined my new 78 Pinto, but in what way...?

Glenn Kuehn /
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first post in 8 years, w/b.

Diagnostics, rather then blindly tearing apart something and introducing more issues, i'm glad you didn't "dig in and pull the whole thing apart"

you mentioned low compression, subjective? it's not uncommon to overheat the piston and damage the sealing of the rings, couple approaches to verify this.

compression tester, because of issues with small displacement motors, either comparing to baseline numbers using the same tester under the same conditions, or comparing to a known good motor are the only useful results.

eg, with this tester, example, your listed TFR has 70#, the puch 50#, inconclusive. (automotive testers give notoriously low results)

pull the exhaust off and look up at the piston while turning the motor, make sure the rings are loose in the grooves.

fuel starvation, remove the carb, take off the float bowl, if you don't tip the carb, look what's accumulated in the bottom of the bowl for fuel health, clean accordingly.

let the gas run into a container, decent trickle? at 45 mph, it takes hours to burn a tank of gas so not much flow is needed.

besides compression and fuel (you said good spark) an air leak will prevent fuel from being drawn into the motor, example a crank seal popping out. add a dribble of gas to the plug hole, install a good, dry plug, and with fuel shut off, try to start.

exhaust off, as the gas could run right out of the motor if the exhaust port is open, try a couple times and check the plug for any color / carbon for signs of burning.

trying to start indicates an airleak or carburation problem.

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