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Bad valves seals or guides?

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Old Oct 18, 2010 | 06:05 AM
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Default Bad valves seals or guides?

puff of smoke upon start up, then smokes as i get to about 2k. i burned 2 quarts in 30 miles!

Compression test show perfect compression across the board and leak down test came out good as well...when we bore scoped the motor there is a nice amount of oil sitting at the top of every piston.

Are the just the seals bad or is it my guides?
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Old Oct 19, 2010 | 05:32 AM
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Default Re: Bad valves seals or guides?

someone throw me a freakin bone....please lol
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Old Oct 19, 2010 | 07:08 AM
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Default Re: Bad valves seals or guides?

Good compression and a passed leak-down test tell you your rings are good and your valves are seating properly when closed. Oil on top of the pistons usually means oil leaking down from the head. So it's definitely seals or guides. How many miles are on this engine? If the valve guides are seriously worn that will usually lead to some noise from the valve train.

Now I may be speaking small block chevy here, but the valve seals keep oil from reaching and leaking past the valve guides. If there isn't any abnormal noise coming from the head I would start with the valve seals. Cheapest, easiest, and most likely bad anyway even if the problem does run deeper.
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Old Oct 19, 2010 | 03:49 PM
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Default Re: Bad valves seals or guides?

most likely valve seals very comon! i have a fresh ported b16 head fresh 0 miles complete if you want a stress free replacement! asking $650! p.m me for the f.s thread.
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Old Oct 20, 2010 | 03:26 AM
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Default Re: Bad valves seals or guides?

Two quarts in 30 miles is insane. You would be crop dusting. Have you checked you IM for oil? The PCV could be leaking.
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Old Oct 20, 2010 | 06:45 AM
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Default Re: Bad valves seals or guides?

thats a lot of smoke....2 quarts in 30 min???
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Old Oct 20, 2010 | 07:20 AM
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Default Re: Bad valves seals or guides?

Originally Posted by dntnedvtec
thats a lot of smoke....2 quarts in 30 min???
2 quarts in 30 miles

the bottom end was just replaced with 0 miles on it, and the head has about 50k.

bore scoped the IM and it was dry
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Old Oct 20, 2010 | 07:27 AM
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Default Re: Bad valves seals or guides?

That rate of oil burn would produce a horrendous amount of smoke. You are positive that there are no external leaks?
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Old Oct 20, 2010 | 10:25 AM
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Default Re: Bad valves seals or guides?

none at all...its does smoke alot
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Old Oct 20, 2010 | 10:31 AM
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Default Re: Bad valves seals or guides?

Well, get your self some valve seals, and get to work! I would doubt that it would be the guides, because it has to get past the seal, before the yada yada yada....you know what I mean.

here you go!!

https://honda-tech.com/zerothread?id=1604753
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Old Oct 20, 2010 | 02:15 PM
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Default Re: Bad valves seals or guides?

that's more than bad seals could ever produce. no seals on an otherwise healthy engine would only burn around 1qt every 500 miles. as it sits you probably look like spy hunter driving around. somehow, you have a a very large problem and i have no idea where to even start guessing.
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Old Oct 20, 2010 | 07:41 PM
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Default Re: Bad valves seals or guides?

Originally Posted by idrivesideways
that's more than bad seals could ever produce. no seals on an otherwise healthy engine would only burn around 1qt every 500 miles. as it sits you probably look like spy hunter driving around. somehow, you have a a very large problem and i have no idea where to even start guessing.
maybe you forgot to put the two dowels between the head and block..
does the valve cover have the gromets for the spark plugs undernieth?
head gasket leak maybe.. are you using head studs like arp or are you using the used oem bolts for the head to block?
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Old Oct 21, 2010 | 04:25 AM
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Default Re: Bad valves seals or guides?

Originally Posted by idrivesideways
that's more than bad seals could ever produce. no seals on an otherwise healthy engine would only burn around 1qt every 500 miles. as it sits you probably look like spy hunter driving around. somehow, you have a a very large problem and i have no idea where to even start guessing.
Your probably right. 1qt every 500 miles? Doesn't it seem like that is quite a bit??
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Old Oct 21, 2010 | 12:48 PM
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Default Re: Bad valves seals or guides?

it is and will fry an exhaust valve after enough time. the oil will coat it and lead to a fracture. 500 miles is much different than 30 though. totally different causes
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