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Location:
NSW, East Coast
Registered:
July 2003
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: oil pressure drama's???
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Mon, 08 December 2003 13:27
 
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i know with my motor, i have too much blowby. and when the cap is on, there is a slow, but steady, stream of air..
when you first take the cap off, it seems like a ruch of air, but it is actually just, sortve', air vibrations coming from the filler neck... so although you feel the air pulstaing, there's not much actually coming out..
if there is heaps of air coming out, then there is probably too much blowby... hmmmm
Cya, Stewart
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Location:
NSW, East Coast
Registered:
July 2003
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Re: oil pressure drama's???
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Thu, 11 December 2003 05:02
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Blow-by ive never heard this term before.
For all the idiots like me could someone please explain blowby, what causes it, is it damaging my motor, is it fixable/repairable.
Thanks heaps.
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Location:
Brisbane
Registered:
May 2002
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Re: oil pressure drama's???
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Thu, 11 December 2003 05:13
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Blowby occurs when the compression rings aren't sealing properly, allowing some pressure from the combustion chamber to leak past and into the crankcase. Obviously a pressurised crankcase will cause the phenomenon you described above.
Blowby itself isn't necessarily damaging to the engine but it is a symptom of existing wear in your engine. Worn compression rings will result in reduced cranking pressure which is obviously bad for power, and combustion gases will gradually contaminate the oil thus reducing its effective lifespan.
As for fixing it, that should be fairly obvious - install new rings and hone the bores (or overbore if they're too worn). Basically you're looking at a bottom-end rebuild.
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Location:
NSW, East Coast
Registered:
July 2003
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Location:
Brisbane
Registered:
May 2002
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Re: oil pressure drama's???
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Thu, 11 December 2003 12:36
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Do a compression test, then squirt some oil down the bores and do it again. If the numbers jump up that means your rings are on their way out.
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Location:
NSW, East Coast
Registered:
July 2003
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Re: oil pressure drama's???
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Thu, 11 December 2003 12:49
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Thanks norbie i will give it a go?
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