froggy
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| posted on 5/6/11 at 04:47 PM |
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head gasket issues (again ) opinions please
my road car has popped its headgasket again and the worry is that there is a trace of oil in no2 exhaust port and a little bit in the turbine housing
. i cant see any marks on the piston and can see the top ring is in tact around no2 piston .
the engine is a saab b234 and running well over 500hp the header tank started to vent a little with water temp at over 110 and the steam was coming
out of the breather pipe not the exhaust plus the piston wasnt steam cleaned as i would normally see . if steam is coming from the breather perhaps
oil is getting in via the same route but its a new one on me .
have some pics 
above no2 cyl low spot which is opposite the blow on the gasket
i very much doubt the oil has come up via a broken ring as i have run 3 bar by accident on another engine with no ring damage and the gasket took the
hit this time .
i had the car idling for a few minutes with the bonnet up after a few boost runs for data logging and as usual the temp had climbed over 100 and i let
it come down to 95 before shutting off but this time it didnt come down after a few minutes so i had a look under the bonnet and saw the header
weeping and a then a bit of blue smoke out the back 
no matter how i look at it i cant see how oil has got into no2 exhaust port as the oil feed is on no1
[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]
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theconrodkid
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| posted on 5/6/11 at 06:13 PM |
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looks like it could do with a skim,oil in the ex port could be valve guide or seal
who cares who wins
pass the pork pies
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ianclark1275
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| posted on 5/6/11 at 07:12 PM |
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increasing water jacket pressures i have found due to slight warping of the block. (combustion gas into water holes via gasket.)
head skim is a must, but even then, for high compression, block is worth skimming flat.
not sure about oil.
measure twice, cut once, scrap it, start again.
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