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Topic Review (Newest First)
08-04-2012 02:32 PM
drostedrummer89 You know these things don't just disappear!

Matt
08-04-2012 11:59 AM
starfuryt550 I didn't know he was still having troubles :(
08-03-2012 11:04 PM
1turbofocus
Quote:
Originally Posted by 6SPD_soul View Post
I don't understand how the valvecover can influence a leakdown test, can somebody explain that?
It cant influence it but with the VC off you can make sure the valves on that Cyl are closed and if there is a lot of blow by the air escaping from around the rings into the bottom of the engine will easly come up through the oil drains in the head to where the VC covers

Tom
08-03-2012 09:23 PM
6SPD_soul
Quote:
Originally Posted by bespurcell View Post
Valve cover removed is just so you can see if valves are closed.
Huh. Seems kind of unnecesary, I thought there might be something more to it then that based on stuff above. If you're even a little off true TDC the piston will move anyway (which you can see on the gauge), and you still know that you were on the compression stroke, if the dial doesn't move at all just go to the companion cylinder.
08-03-2012 09:06 PM
bespurcell Valve cover removed is just so you can see if valves are closed.
08-03-2012 05:53 PM
6SPD_soul I don't understand how the valvecover can influence a leakdown test, can somebody explain that?
08-03-2012 09:30 AM
drostedrummer89
Quote:
Originally Posted by Roushturboedzx3 View Post
Prob broken ring lands or leaking valves.
Don't leaking valves only cause air to escape through the intake? There's no way it could pressurize the block, right?

valve cover was off. i have read that sometimes a cracked or warped cylinder head or blown gasket can cause air to exit an ajacent cylinder. I need to redo the test and tap the buckets on cyl 3 to see if the valves snap shut. may also pull the cams.

We are really hoping its in the top end, we don't want to get into a full rebuild.

as a side note, we did the same leakdown test under the same circumstances a few months prior, and we had ALOT of air leaking from valvecover. like over 20% on 2 different cylinders. we were surprised that we didn't get anywhere near the same results. we'll do it a third time and check back.

Matt
08-03-2012 08:40 AM
1turbofocus
Quote:
Originally Posted by drostedrummer89 View Post
Right. No the oil did not help significantly. It did help it smoke significantly after startup, figures.

How in the world could pressure testing cyl 3 result in cyl 4 blowing out air? Cracked block? Cracked head? Blown head gasket?

Matt
Posted via FF Mobile
My guess would be an open intake valve blowing it into the intake and into cyl 4 , if you have a cracked anything or blown HG you would have 2 dead Cyl and you dont

When you did this test did you have the valve cover off and check to make sure all valves closed on the testing Cyl

Tom
08-03-2012 03:26 AM
Roushturboedzx3 Crack block seems extreme to me. Prob broken ring lands or leaking valves.
08-03-2012 12:32 AM
Indy'sexclusiveZx3 I vote cracked block
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