gasoline washing cylinder walls

booshay

New Member
Apr 17, 2010
1
0
0
I have a 94 mustang single turbo that i have been trying to get running for a couple of months now. It has been missing bad since i put the new short block in it. I have been adjusting the valves over and over(Victor Jr. stud mount heads). i have probably tried starting the car 20 or 30 times and i am just wondering is that enough to wash the rings and walls out and ruin my compression? I have checked compression with a compression tester and i am not seeing any psi. When i first put the heads on the rebuilt short block there was about 120 psi on all cylinders. I have run the valves several times thinking that the missing was because of valves not being right. I just really want to know if my shortblock could be ruined yet because of all the gasoline flooding the cylinders everytime i try to start the car. Like I said I have tried to start it about 20 to 30 times already. If anyone knows how long it would take to wash the shortblock out bad enough that it would have no compression i would appreciate the insight. Thanks.
 
Im guessin its leaking through the valves, not the rings, but you can squirt a tablespoon(@) of oil in the sparkplug hole, then test it again, if psi goes up then it is a ring problem

ps- its good to prime the oil pump anytime it sits for a while (just before starting it)
 
If you are fuel injected I don't think you'd really have a problem with washing down the cylinder walls like you would in the days of a big four barrel carb sitting up there leaking and the accelerator pump squirting gas with every tap of the foot. It probably hasn't done the engine any good, but I can't see the compression going away with just cranking on it a few times. As mentioned earlier it would be a good idea to squirt a little oil in the plug holes to bring the compression up at the rings and also provide a little peace of mind that the cylinder walls are getting lubed.
 
There is no way to wash down cylinders during start up. The starter is only cranking the engine 200-300rpm. Even if you were pouring fuel in there it would not cause premature cylinder or ring wear, it takes thousands of rpms and heat not hundreds of rpms cold starting. To me it sounds that the valves are not closing either by incorrect valve adjustment, wrong push rods or bent valves.

Scott