Posted by MikeJM on February 27, 2020 at 04:54:41 from (174.201.6.189):
In Reply to: Porting Cast Iron head posted by Jwilhelm770 on February 26, 2020 at 10:17:00:
Without a flow bench, anyone would be shooting in the dark.
Generally on old tractor engines the port is already too big.
The biggest area to improve on is the valve seat area, seat angles and the area on either side of the valve.
The trouble with certain heads, especially gas engines with chambered heads is the chamber severely shrouds the valve, to the point a very large valve might flow worse.
What model Oliver? Waukesha installed larger valves and made the ports larger as hp increased through the years. It s not uncommon to install valves from a 880 into a 77 head.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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