Head scratcher

[Scooterwrench]

In other words, 12 oz of 10-weight oil + 116 oz of kerosene. (See attached.)

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FWIW --

Not even sure you can get straight 10w motor oil anymore.
Think ATF would work in its place?

 

[Road Trip]

Not even sure you can get straight 10w motor oil anymore.
Think ATF would work in its place?

In this discussion it's claimed that Type F is equivalent to 10 wt:
(BITOG ATF discussion comparing viscosity to engine oil wt)

It would be cool to use a couple of 'known-good/flown good' lifters
that work like you want them to, and then use these to 'calibrate' your
fluid/test fixure combo.

For the sake of argument, you alter the ATF/kerosene ratio until you can get
your known-good lifters to take a midrange value of say, 30 seconds to bleed
down at a specified shop temperature.

If you end up getting repeatable results after 3-4 iterations, then you now have
positive control over your test process. And this way you can compare
new / NOS / used lifter behavior as referenced to your 'ideal' control lifters.

Maybe not traceable to the National Bureau of Standards, but plenty
more scientific than 99.9% of what the other powerplant craftsmen out
there currently do when it comes to measuring actual leakdown rates.

Nice thought experiment...

 

[Scooterwrench]

In this discussion it's claimed that Type F is equivalent to 10 wt:
(BITOG ATF discussion comparing viscosity to engine oil wt)

Type F is getting scarce too!

 

[Pinger]

Not even sure you can get straight 10w motor oil anymore.
Think ATF would work in its place?

Hydraulic oils tend to have the largest viscosity span so I'd look there. Not sure what you guys are referring to as ''weight''. The SAE scales are different for engine oils than other eg, gear oils. ISO scale is more precise.

 

[SAATR]

ISO 32 hydraulic oil is referred to, at least by Caterpillar, as a 10W oil. ISO 32 is plentiful, so no problem sourcing a replacement.

 

[L31MaxExpress]

DIsconnected and taped over the PCV vent hose. I need to back off all the intake rocker arms to verify it is not smoke leaking past the pistons rings, but it nearly immediately stated smoking from the oil filler tube injecting smoke into the intake manifold. Leaking intake gaskets can definitely explain both the misfire and oil getting on a couple of plugs. The ring seal is pretty tight from leak down testing but it seems like even a minute amount of leakage shows smoke.

You must be registered for see images attach

 

[Scooterwrench]

Leaking intake gaskets can definitely explain both the misfire and oil getting on a couple of plugs.

You must be registered for see images attach

I think you'll find that's the culprit.

 

[rebelyell]

I can only imagine looking on a typical USA store shelf of oils --- looking for weights per ISO viscosity x, y or z --- and then asking an employee for assistance-interpretation with same. bad mojo

 

[L31MaxExpress]

I think you'll find that's the culprit.

I ran it for a bit longer and I also noticed smoke on top of the intake manifold around cylinders 1 & 3. Took a blew into the 1/2" PCV hose connected to the manifold, and smoke billowed out from the crankcase vents on the valve covers. Also explains why my IAC counts are suddenly Zero at hot idle in Park with the ac off.

 

[Scooterwrench]

I ran it for a bit longer and I also noticed smoke on top of the intake manifold around cylinders 1 & 3.

Warped manifold? I'm sure you tightened the manifold bolts from the center out. Is that a new manifold? I had to toss a factory aluminum manifold off an 86 Firebird when the guy melted the motor.