Posted by Bob Kerr on January 04, 2009 at 19:05:16 from (63.134.174.180):
In Reply to: H power increase posted by Scott NY on January 04, 2009 at 03:42:44:
If you want to keep it simple just look for a set of Firecrater or high altitude (5000 ft)pistons (or similar type) and sleeves. Better think about freshening up the bearings and grind the valves while you are in there. If the bearings are a bit loose now they might start knocking with the extra jolt of the higher compression. I have a 51 H also with Firecraters and it delivers 150 lbs of compression on all 4 with those pistons. It makes plenty of power for pulling logs and what not, but haven't hooked it up to a plow yet but I have no doubt it will pull fine even in clay. It did pull a 16ft trailer with seats and full of people at idle in 5th gear and I hate to say it but the idle was so slow it sounded like a JD, but kept right on going and not once acted like it would die. There is a nice little "crack" to the exhaust with that compression. If I am pulling a good size log up a hill at full throttle it has never acted like the carb was too small. Just remember, a lot of carb engines run more efficient at a higher air flow through the venturi. Too big of carb will slow down the air flow and not mix the fuel all the way. it might act like it runs better, but that is just because some gas isn't getting vaporised and it is running lean at that point and lean can act more "snappy" but falls down with a load.
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