Oil Blow by the pistons.....what to do?

K-80-123

K-80-123

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Had a friend look at my truck today.....we took it out for a short spin and after we got the motor up to normal operating temp....it started smoking when I pulled up to a stop light....when I got home we left the truck running......And my friend took the oil filler cap off....smoke would come out of the filler cap hole.

My question is this common when you have a rebuilt motor where the piston rings have not seated yet?.....How long would it take to seat the rings?.....Or is this bad to even drive the truck with this going on?

My friend said after about 1000 miles on the new engine the rings should seat and solve my smoking issues????.....Just would like to know what you guys think.....Boomer and I have talked about this....he has a game plan when he gets my truck.

Let me know what you think?


Walt
 
Walt,
My guess, and it's nothing more than that, is that Stinker may have hit the nail on the head and you have a crank case ventilation issue of some sort. Perhaps something is hooked up that's not supposed to be or visa versa. Running a power adder can add pressure to the engine and force this kind of stuff (oil comsumption/smoke) if it's not plummed correctly...that said, I'm a dipshit and don't have a definitive answer ot you question.
 
I thought that's what it was until it started knocking. Then it was too late. I don't mean to scare you because new rings definitely need to seat and the turbos are adding a lot of pressure that can blow past new rings. Just be careful.
 
Ring seating is a possible issue, but not likely with the ring material and cylinder wall finishes that accompany most 3 piece oil ring sets today. If in fact that is what
was used.
Do you have an itemized parts list that indicates the type and brand of ring used?
It could also be oil from the turbos, and or the stem seals. Or as was mentioned a breather problem.
Following a thorough visual inspection.
A leak down test is the first order of business in this situation.
You need a qualified forensic diagnostician to lay out the operation and evaluate the engine and perapherals.
 
Walt, a lot of times when tuners build motors for high boost, the general rule is "total-seal-rings". When my TT300ZX was rebuilt the first time in 1997, they were used and we ran 30-wt petroleum-based oil through the motor for 500 miles of varying engine loads but only 6-8 lbs of boost. The exhaust smoked a little...not under load, but on deceleration.

The oil was changed to 40-wt for another 500 miles (still petroleum-based). The smoking stopped at about the 800-mile-mark.

After the 1,000 mile mark, I then switched to 20-W50 synthetic oil and turned the boost controller up to 20psi. I have used the Amsoil 20-W50 Severe Service Racing Oil for the last 40,000 miles. I have had some crazy "banzai" runs in excess of 180-mph.:2in1:

Only in the last few months have I seen any signs of smoking that got my attention and decided to have the motor freshened up....which is where the car is now undergoing a major build with new ball bearing turbos.

This time to the tune of another 20K.:( I've been waiting since Nov. last year. I can relate to some of your issues. I do know that these things take a time and and money.

Hope all goes well for you.

Esh
 
Is the smoke a steady stream of smoke or does it puff like a choo-choo train? If it puffs then you could have a problem. My Impala puffed and that's how I found out I had a cracked piston.
 
Stingray said:
Is the smoke a steady stream of smoke or does it puff like a choo-choo train? If it puffs then you could have a problem. My Impala puffed and that's how I found out I had a cracked piston.
Click to expand...

Yup. That was exactly what mine was doing after losing a chunk of a piston. I too was first inclined to think PCV issues. Hopefully this isn't your situation Walt.
 
I've heard that Hennessey lists parts that he installed when doing upgrades but in fact never did it. Who knows what you have internally. Only one way to find out. I'm looking at my "options" (if you know what I mean) regarding my issues of late, perhaps its time for you to do the same.

Paperwork, paperwork, paperwork may help you if you go certain avenues with Henny. Its a bunch of crap to have all this smoke and other issues you've got for the money you've spent. Litigation may get you some of it back. You may want to check previous court or litigation actions against John (I think its part of the public record) to see if there is a trend or how to go about things legally. He's done this before (broken promises).
 
Thanks Guys

It only smokes when you idle...not when your driving.
I have no parts list from Hennessey.
I am running 5w50 mobil one.
There is only 200 miles on the new motor.
It has a crank case breather.

The engine make great power but when you stop it smokes....Hennessey never said anything about ring seating.....he seemed as surprised as I was about the smoking problem.

Boomer will need to look at it and decide what is the best course of action....I just did not know if ring seating was the problem.

Walt
 
Its just plain ol BS! You pay all that jack and your shit should be perfect! This is the common problem for all of us that dont live 5 minutes from Boomer or dan Cragin....(mike you bastage)....no wonder his shit runs good, BUT it is at DC ALL THETIME,......Walt to have the level of service Mike gets u would have your truck on a car hauler more than u would have it in your garage....I seriously doubt any of these trucks are plug and play easy!! Many trips to tuners and changes to tunes are immenent! IT SUCKS! That why Im in the boat that I am in........shoulda left mine stock!
 
K-80-123 said:
Thanks Guys

It only smokes when you idle...not when your driving.
I have no parts list from Hennessey.
I am running 5w50 mobil one.
There is only 200 miles on the new motor.
It has a crank case breather.

The engine make great power but when you stop it smokes....Hennessey never said anything about ring seating.....he seemed as surprised as I was about the smoking problem.

Boomer will need to look at it and decide what is the best course of action....I just did not know if ring seating was the problem.

Walt
Click to expand...
quit driving it bro, there is something major wrong. you wont have that kind of blowby at idle, even with low tension rings. we just need to get it, and fix it right.
 
Listen to BOOMER! i wish I had. I did 90 percent, just got a little off the beaten path with the tranny and tuner...hehe cost True Performance a motor rebuild.....
 
Walt I totally agree with Boomer, don't run it anymore. Get it to him ASAP, before anything bad happens. Just my opinion.

Bill.
 
K-man your rings are seated enough if have gotten into it allready, this is what I would like you to check,

On the breather system does it come from the valve cover into a catch can of sorts? and if so does it also route to the air intake somehow?

for isntance this is what I found with mine, it came from the valve cover to a catch can but also had a vaccum pulled on it from the air intake, in doing this it would pull oil thru the system and into the turbo, just enough for it to smoke at idle and idle only like yours.


The way I am swapping it to is individual moroso catch cans with a filter on top. this way it is not brought back in to the engine . I will post pics as soon as I can.

I personally dont think you have an engine problem bro, could be wrong, but John H does actually have one of the best engine builders in the nation period.
 
Stinker said:
K-man your rings are seated enough if have gotten into it allready, this is what I would like you to check,

On the breather system does it come from the valve cover into a catch can of sorts? and if so does it also route to the air intake somehow?

for isntance this is what I found with mine, it came from the valve cover to a catch can but also had a vaccum pulled on it from the air intake, in doing this it would pull oil thru the system and into the turbo, just enough for it to smoke at idle and idle only like yours.


The way I am swapping it to is individual moroso catch cans with a filter on top. this way it is not brought back in to the engine . I will post pics as soon as I can.

I personally dont think you have an engine problem bro, could be wrong, but John H does actually have one of the best engine builders in the nation period.
Click to expand...
dude, he also has smoke rolling out of the valve covers. that isnt oil going into the turbos.
 
Yep had that also, I'm not saying he "dont" have problems with the engine, just know the builder is aweful good, but I had the same problems with mine , valve cover smoke, exhaust smoke, heck even once out from under the fendors. Just saying depending on th way the breather system was put on and located it could be part of the problem. Just making a suggestion of checking, I'll leave it alone.

I'm sure you will take care of it,not saying anything you said was wrong, apologize if it came off that way
 
Not saying on V10's, I have seen if the block was bored without a honing plate it does it also - out of round after heads being torked on - will not seat rings. Other issues were valve seat pockets to deep and puddled oil and was sucked thru valves guides. They needed valve guide umbrella seals put on.
 
Stinker said:
Yep had that also, I'm not saying he "dont" have problems with the engine, just know the builder is aweful good, but I had the same problems with mine , valve cover smoke, exhaust smoke, heck even once out from under the fendors. Just saying depending on th way the breather system was put on and located it could be part of the problem. Just making a suggestion of checking, I'll leave it alone.

I'm sure you will take care of it,not saying anything you said was wrong, apologize if it came off that way
Click to expand...
no worries bro, glad you give a crap. your a good shit..............most of the time, when you take your meds!:D :D
 
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