Blowby and oil usage
01-29-2009, 05:59 AM
#31
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while im in there to do a leakdown test, ill check the seals. say a seal did break/crack or is leaking, wouldnt i get some oil running down the stem into the combustion chamber causing a bit of blue smoke?? or could it leak enough pressure past but not be bad enough to let an excessive amount of oil past??
Lets not forget the exhaust valve stems either as the exhaust ports are pressurized.
01-29-2009, 10:23 AM
#32
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OK, I do not see how this could be at a idle where no boost is being applied,
also..engines are not running at full boost all the time, so this would have to happen say at 5 lbs and more ? (Just for a number )
I understand the stem area sees boost preasure as a constant when under boost,
But, how much air can you get up 24 stems at 20 lbs boost with a clearance of a thou ?
Again Please no one take this like a argument...just a educating conversation
thanx
also..engines are not running at full boost all the time, so this would have to happen say at 5 lbs and more ? (Just for a number )
I understand the stem area sees boost preasure as a constant when under boost,
But, how much air can you get up 24 stems at 20 lbs boost with a clearance of a thou ?
Again Please no one take this like a argument...just a educating conversation
thanx
01-29-2009, 03:30 PM
#35
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it does happen only when im in higher boost (20psi +).
i talked to jeff this afternoon, and he seemed to think its more of a turbo problem, or rings. but he did say that valve seals are a possible. if it was a turbo, i would see signs of oil burning somewhere, be it intake or exhaust. i think the valve seals make pretty good sense, im curious about what shape the guides are in.
what do you do if your running more boost than what the hx35 makes? some are running twice what im making?? does someone sell better seals??
i talked to jeff this afternoon, and he seemed to think its more of a turbo problem, or rings. but he did say that valve seals are a possible. if it was a turbo, i would see signs of oil burning somewhere, be it intake or exhaust. i think the valve seals make pretty good sense, im curious about what shape the guides are in.
what do you do if your running more boost than what the hx35 makes? some are running twice what im making?? does someone sell better seals??
01-29-2009, 04:12 PM
#37
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it does happen only when im in higher boost (20psi +).
i talked to jeff this afternoon, and he seemed to think its more of a turbo problem, or rings. but he did say that valve seals are a possible. if it was a turbo, i would see signs of oil burning somewhere, be it intake or exhaust. i think the valve seals make pretty good sense, im curious about what shape the guides are in.
what do you do if your running more boost than what the hx35 makes? some are running twice what im making?? does someone sell better seals??
i talked to jeff this afternoon, and he seemed to think its more of a turbo problem, or rings. but he did say that valve seals are a possible. if it was a turbo, i would see signs of oil burning somewhere, be it intake or exhaust. i think the valve seals make pretty good sense, im curious about what shape the guides are in.
what do you do if your running more boost than what the hx35 makes? some are running twice what im making?? does someone sell better seals??
01-29-2009, 04:45 PM
#38
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You can do this..When you are changing out your seals, after the air is chucked to the cyl you are working on do the valve spring drill , remove the seals, push on a Pice of tight fitting rubber hose part way dwn the stem. ( you do not want to loose the valves at this pt, )
Unhook the air. The valves of course will drop a dwn a little but now you can feel exactly how "loose they are in the guide bore.
Unhook the air. The valves of course will drop a dwn a little but now you can feel exactly how "loose they are in the guide bore.
01-29-2009, 05:03 PM
#39
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I am having a problem with my 98 24valve. i have an excessive amount of oil coming from the breather tube anytime i put the truck under load. i drove it to work last week with a load of scrap in the bed, and it pushed a gallon of oil out and all over the bottom of the truck. if i baby it, i can drive it for weeks without using a drop. it started for the first time towing my car back from carlisle pa last summer, and it seems to be getting worse as time goes on.
the truck has never seen more that 35 psi of boost, and didnt use a drop of oil before that trip from PA. i rebuilt the vac. pump a few weeks ago, and it didnt make a difference. i plan on doing a compression test next sunday.
im starting to think it may have broken a ring or something, and its only showing up with higher boost levels. anyone have any ideas or sugestions. all mods are listed in my signature. thanks guys
the truck has never seen more that 35 psi of boost, and didnt use a drop of oil before that trip from PA. i rebuilt the vac. pump a few weeks ago, and it didnt make a difference. i plan on doing a compression test next sunday.
im starting to think it may have broken a ring or something, and its only showing up with higher boost levels. anyone have any ideas or sugestions. all mods are listed in my signature. thanks guys
01-29-2009, 07:39 PM
#40
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logskidder, the truck has been driven regularly since i bought it 8/06. jeff said that the compression numbers sound good, and that he has never seen a 24valve with 130k that needed rings, regardless of power levels.
johnh, we just put a super b on my friends 12 valve, so i think im going to take his stocker and run the truck for a bit to see what happens before i do the seal
johnh, we just put a super b on my friends 12 valve, so i think im going to take his stocker and run the truck for a bit to see what happens before i do the seal
01-30-2009, 12:28 PM
#41
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01-30-2009, 02:58 PM
#42
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my definition of oil consumption is using or losing .... the end result is the same
01-30-2009, 06:09 PM
#43
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01-30-2009, 06:17 PM
#44
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Well...I just want to know if the valve stem seal deal has any truth to it....As I still do not see how .... unless the guides were so worn they are all have a orgy and swapping holes and valves with EA other .
01-30-2009, 06:37 PM
#45
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I am also interested in the fix. I first would have said vacuum pump but he rebuilt that. A peek at the turbo intake/exhaust would be next.(done) Compression (done) or leakdown check would follow. I don't have a boroscope or access to one anymore but some might. If non of these shows anything, then I would check the valves using compressed air to hold them up while removing the keepers and replacing the seals at the same time, if nothing found then it starts to get deeper and maybe expensive.
All that said if I had a spare turbo laying around to try.....
All that said if I had a spare turbo laying around to try.....