Too much blowby with dyno?

what engine you have?

 

Every engine manufacturer has a different way to test with different specs specific to their engine. They are generally the same way, but not the same.

 

I don't understand all this talk about blow by. The only #### blowby I know of is a big tube next to the engine pan in the older trucks and as long you aint pissing fluids and such through that, is all well.

The other kind of blowby relates to bad piston rings and valve sealing angles going bad among other possibilities in a small 351 cleveland engine, it will kind of starve for compression in each cylinder tested manually with sparkplug removed and the engine turned over slowly manually.

If you have a music in your big truck engine working hard. Roll it. Keep busy. But if you did have a TIRED engine that simply is just laying down and refusing to roll the mountain or whatever, then have it tested. But don't be focused on just the blowby talk.

I literally do not know much about big rig blow by. In Desiel you pull mixture air and fuel in and compress until it explodes over a long time. That is your power, not like a gas engine with spark. Do I have that right? What else do I not know?

 

Be patient, you haven’t seen anything yet, wait until he gets on a roll about absolutely “Nothing”..............

 

all you need to know if you go to a reputable place like a Cummins dealer a cathouse a Detroit shop not somebody with some laptops a doll I could or some shade tree mechanic..
when you pay the hundred 30 or $140 for a Dyno on a truck you should be able to see wants to report print out where it's at and where it should be.
most people don't read anything that's where they make a mistake someone says hell yeah it looks good when you read the soot level when you read the blow-by there's parameters if it's close to being almost out of the parameters on every single one buyer beware!!
that's why when you go to buy a truck you treat it as an investment you spend a hundred and fifty bucks may spend seven hundred bucks?? on five different trucks but if it were a reputable dealer or sales person when you say I want to take this and have it dynoed before I even think about anything else and they refuse to let you do it
RUN DON'T WALK FROM THAT PLACE

 

There's a thread on here someplace of a dude that bought a truck, dyno'd, dropped the pan, valve cover, rear ends, almost regasketed the f truck. Spent like 4 grand or something.

Ok he's been assured by everyone.

Blows up on the way to the first load.

 

sometimes it happens that way you can take all the precautions in the world...