Quote:
Originally Posted by Enes
Sorry to jump in this thread but its similar to my situation, last time i checked my compression it was still 170 to 174 on all cyl. but i was still geting blow by.
would hate to rebuild the engine if its just the valve seals wouldn't amount of blowby affect compression? if you had more blowby = lower compression..
where i'm getting at is if you do your valve seals wouldn't that increase your compression a bit too?
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No. Compression is the highest amount of pressure at TDC on the compression stroke with all valves closed. Blowby going by the valve seals occurs when the intake or exhaust valves are open so it doesn't affect your compression.
You can replace your valve seals without taking your head off, but it's a tedious procdure. It involves having that particular cylinder piston at TDC and putting rope in the cylinder to keep the valves closed or pressurizing the cylinder with air to keep the valves closed and popping the spring retainers with a O2 sensor socket. It's probably best to just take the head off and replace your timing belt components while you're in there though.