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Top of pagePrevious messageNext messageBottom of page Link to this message  By Ronnie Wehba on Saturday, May 18, 2013 - 02:49 pm:

original ford head ,,what is the spark plug size,,gonna go git a compression gauge,,still got a miss

need it fixed next weekend is the WASP reuion here,,womens airforce service pilots,and would really like to give them a ride as this is where they trained at


Top of pagePrevious messageNext messageBottom of page Link to this message  By Chuck Hoffman - Gold Country of Calif. on Saturday, May 18, 2013 - 03:06 pm:

Pipe thread


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ronnie Wehba on Saturday, May 18, 2013 - 03:25 pm:

well i think the same valve is trying to stick again,,very irregular miss,all plugs firing gonna go pull timer now just to check.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jim Thode Chehalis Washington on Saturday, May 18, 2013 - 03:41 pm:

Ronnie,
This thread will help with a tester:
http://www.mtfca.com/discus/messages/179374/219847.html?1309011046

For a stuck valve or mayor differences in compression it is easy to compare how hard the engine is to turn over on each compression stroke with the hand crank.

Good luck,
Jim


Top of pagePrevious messageNext messageBottom of page Link to this message  By Wayne Sheldon, Grass Valley, CA on Saturday, May 18, 2013 - 04:55 pm:

Once in awhile, sticky valves won't show up with a compression test. What can happen is that the valve closes, but too slow. Exact rpm will vary greatly form case to case and even on the same engine for a dozen reasons (like relative thermal differences or rotating bent stem). So under a hundred or even several hundred rpm, it will close and show good on the compression test. However, at higher rpm (500, 1000, 1500), the valve may hang up lowering the compression enough to make it run rough. I have seen valves that would hang up and then snap shut about a half stroke too late.
It is still well worth the standard check. If it shows up, you know what to fix. If it doesn't show up, you are no worse off.
Drive carefully and enjoy, W2


Top of pagePrevious messageNext messageBottom of page Link to this message  By Wayne Sheldon, Grass Valley, CA on Saturday, May 18, 2013 - 05:03 pm:

Sometimes, if the trouble is a sticky slow closing valve, simply putting in a slightly stronger valve spring may fix it. It may be worth just trying that on both springs in the offending cylinder just to see what happens.
W2


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dennis Halpin on Saturday, May 18, 2013 - 06:31 pm:

"WASP reuion here,,womens airforce service pilots,and would really like to give them a ride as this is where they trained at".
Very few 'WASP's' left. :-(


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