GrannySShifting

iTrader: (10)

Who makes them (hamburger, B&B) and how much do they really tell you?

Heres a thought.. on a running engine at WOT vs idling is it possible for a motor with no signs on blow by at idle to push lots of oil past the rings/valve seals due in part to a restrictive exhuast?

https://ls1tech.com/forums/showthrea...00#post3208900

GrannySShifting

iTrader: (10)

anyone?

technical

Bad rings can seal decently at idle and seal like crap at wot when combustion pressure begins to rise. Valve guide usually don't leak into the combustion chamber for very long after startup.

GrannySShifting

iTrader: (10)

thats what I was thinking a blow by gauge used at idle cant tell much... but what about one used at WOT?

crainholio

iTrader: (2)

If you're talking about a leakdown tester, they're used w/ the engine shut off only...can't viably use them with the engine running.

They won't test for ring flutter like the '01 engine ring packages are prone to, but they'll very accurately test static ring sealing and valve sealing. You'll get a nice audible (with a mech stethoscope) hiss where the air is escaping.

Best application is testing all 8 cyls and measuring variation between cylinders.

GrannySShifting

iTrader: (10)

Not talking about a leakdown

http://www.jegs.com/cgi-bin/ncommerc...67&prmenbr=361 for example.

crainholio

iTrader: (2)

That's pretty cool, thanks for the correction. I guess you'd have to disable the PCV while testing with that, but it would give you a good indication of crank case pressurization.

technical

I'm just throwing this out there...
If the rings weren't orientated correctly when the engine was assembled, they could cause a similar problem. i.e. The gaps almost lining up vertically. I've seen it once, and heard about a few other cases. Food for thought.

GrannySShifting

iTrader: (10)

I could see it giving you a reading but does it have enough resolution to really tell you anything is what Im wondering you know what I mean?

crainholio

iTrader: (2)

You'd need another engine for comparison in order to make this gauge's readings useful. It won't tell you which specific cylinder(s) have issues. It will, however, let you test at WOT conditions which a leakdown tester won't.

For the questions you're asking I'd go with a leakdown tester instead of this instrument.

GrannySShifting

iTrader: (10)

Im going to do a leak, but this thing doesnt smoke at all idle or part throttle or smell like oil... until WOT

technical

You didn't do a leakdown test yet? Definitely start there....you probably aren't seeing smoke since crankcase pressure is relatively low at idle.