Posted by CoopertownBob on May 29, 2012 at 21:03:32 from (74.51.5.44):
In Reply to: H Questions posted by mkirsch on May 29, 2012 at 14:52:58:
BruceS. said: (quoted from post at 17:52:58 05/29/12) Serial tag no. and engine no. don't match. In fact, there's about 100,000 difference.Is this common? Also are Autolite 388's OK for an H? It came with those and they look fine. Thanks for answers.
The serial number issue has been well covered, but not the plugs.
The 388 is too hot a plug to use in the H, even for modified engine pullers. They take away torque from the little engine, same as with Champion D-21's. BTW, the 388 is equivalent to the Champion D-23 in heat range. Use the 3116, gaped at .025 or even .030-.035 if your coil with fire them and run regular pump gas in it. Don't waste your money on additives or high test gas. These engines don't make anywhere near enough compression to need it, even with the initial timing advanced 40 degrees and fire-crater pistons installed. Or, if you dislike Autolite, use the Champion D15Y or D18Y. Champions are original to Farmalls. I wouldn't bother changing the 388's out though until they needed it, unless you know of a Popper around that needs plugs. Those old Johnnie-Poppers need the highest heat range plug they can get to help avoid fouling.
BTW Bruce, what are the serial numbers on each?
This post was edited by CoopertownBob at 11:45:34 05/30/12.
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