Blow By... Front main blown again.

[Chevy1925]

I'd get concerned about anything over 25-30%

I wonder if 400 miles just isn't enough to seat the rings? Maybe needs a few hundred miles towing a few thousand pound trailer to help them seat?

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Constant rpm is not the best idea to set rings.

I'm more curious on ptw clearance, ring gap, oil pump he's using, rpm he's turning, compression ratio and injector size.

I have a feeling he has a few things not helping the cylinders seal up

 

[LBZ]

Constant rpm is not the best idea to set rings.

I'm more curious on ptw clearance, ring gap, oil pump he's using, rpm he's turning, compression ratio and injector size.

I have a feeling he has a few things not helping the cylinders seal up

Don't recall saying anything about constant rpm. Just increase the load on the engine via pulling a heavy trailer.

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[Bustedknuckles]

Put some standard oil in it and go beat on it for a while and see if that doesn't help....

 

[Ne-max]

Many sled pullers and racers dont put on many miles. They dont loose that much oil.

 

[Chevy1925]

Don't recall saying anything about constant rpm. Just increase the load on the engine via pulling a heavy trailer.

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i know, but you also didnt say anything about not staying at a constant RPM. i was just adding to your post. guess it kinda looked like i was trying to tell you about constant RPM

 

[DMAX497]

Truck runs in the upper 3-4K + rpm life... Injector is about 350% over according to flow sheet.

Don't know what oil pump is in it. Nor the ptw or gap. Thought ptw was built into the piston from MAHLE?

 

[Chevy1925]

Truck runs in the upper 3-4K + rpm life... Injector is about 350% over according to flow sheet.

Don't know what oil pump is in it. Nor the ptw or gap. Thought ptw was built into the piston from MAHLE?

ptw clearance changes as you hone the cyl walls so while mahle may make the pistons a few thousands smaller, that doesnt mean that the machine shop didnt open the cyl up too much and create too much ptw clearance.

the fact you are not getting any blow by out of one side of the engine leads me to believe thats not so much your issue but something is not fully seated or cant get seated. the LBZ engine i just built has 0 blow by even when first started and ran hard but that is on cast pistons and rings for those pistons, yours is a little different setup.

let that engine get up to temp and put some heat into the system, then go playing with it regardless of the heat soak you are worried about. see if things start sealing up then

 

[ikeG]

If it had enough of ptw to make it have this extreme blow by, it would be a noisy sucker.

 

[DMAX497]

The motor doesn't have any odd noises or rattle. Just is smooth and just screams!

What oil should I put in it? Good ole delo? Rotella? Non synthetic...

 

[Chevy1925]

your choice. the oil debate on here gets retarded.

 

[Awenta]

Whatever makes you and your motor happy.

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[DMAX497]

Okay pass on the oil debate no need to get de railed.

 

[LBZ]

your choice. the oil debate on here gets retarded.

No kidding!!

Changing from different weights or syn to non-syn may make slight changes in blowby, sound or smoke but not major changes and certainly not fix your issue.

What confuses me is why one side and not the other? It's a common crankcase so I'm not thinking rings now. Beginning to think maybe a valve or injector is leaking past in that head.

Leak down test will definitely help you find the source though.

 

[hondarider552]

your choice. the oil debate on here gets retarded.

You lost all your hair trying to argue in those threads

 

[duramaxzak]

You should never break in a motor with synthetic oil. I have Mahle forged .020" over Pistons in my pull truck and the PVC hose never even has oil residue in it. I'm guessing your rings have not seated yet.

 

[DMAX497]

Had Joe Gibbs break in oil for about 250 miles... Then switched to Redline for the last 100 miles... Going to be putting other oil in.

 

[Chevy1925]

You lost all your hair trying to argue in those threads

:roflmao:

 

[LBZ]

You should never break in a motor with synthetic oil. I have Mahle forged .020" over Pistons in my pull truck and the PVC hose never even has oil residue in it. I'm guessing your rings have not seated yet.

Why? The corvette and other vehicles are broken in and shipped with synthetic in them. As long as you change the oil after a 1000 miles or so in a fresh build there is nothing wrong with synthetic oil.
Amsoil says it's fine also.

 

[duramaxzak]

Why? The corvette and other vehicles are broken in and shipped with synthetic in them. As long as you change the oil after a 1000 miles or so in a fresh build there is nothing wrong with synthetic oil.
Amsoil says it's fine also.

There is nothing wrong with synthetic, just not a good break in oil. Way to slick and will usually not let the rings seat in properly.

 

[LBZ]

There is nothing wrong with synthetic, just not a good break in oil. Way to slick and will usually not let the rings seat in properly.

Ok then.