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Farmall Tractors Discussion Board |
Re: Modified farmall
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Posted by BDM on May 30, 1999 at 08:24:58 from (24.4.252.128):
In Reply to: Modified farmall posted by JMc on May 29, 1999 at 19:16:13:
Thats intresting but I would like to throw in some food for thought. There is a Gent in my area with a PTO Dyno, he has modified several tractors with the factory Engines and taken readings to see his results. Now figure that the factory engine is generally far more durable in the long run than most automotive engines, one reason is the low RPMs they run at, and of course weight isn't as much a consideration when building them so they beef up areas in the engine that suffer alot of stress. Back to what I have seen from factory engines such as the 264 cid. His was producing around 90 HP at 2000 RPM, this of course was with modifications to compression, ign timing, improvements in the ign system and slight modifications to the head and using a larger bore to bring the engine to 281cid, including a cam change, but the cam change only improved HP by 10 over the factory cam, also the factory cam had a much broader torque/HP curve with the other improvements mentioned giving it much more lugging power at low RPMs. One of the biggest and easy improvements I have seen in any Tractor engine is bringing the compression up around 9 to 1, keeps the torque/hp curve way up at lower RPMs by a good margin. Remember that these engines operate in low RPMs, so keeping velocity high at low RPMs is very important. Porting can actually hurt performance at low RPMs. Unless you plan on entering Tractor pulls in the modified class then do it. Most Auto engines do not produce that kind of power at low RPMs{Great for lugging}, especially below 1000{bar most Bigger SBs and Big Blocks of course, and then there efficiency is not good at all there} You mentioned you want to work 5 acres, you will make more power without a doubt using a V8, especially a big block, but if the intended use is for a work horse you will be further ahead keeping the factory engine and putting the money into building it, and probably saving money to boot, along with the modifications that will half to be done. It all depends on what you really want from the machine and where your skills lay{and time}. Here is the formula for figuring your HP or Torque at a giving RPM. HP= RPM x Torque divided by 5252
Torque = 5252 x HP divided by RPM Just my "2 cents", good luck.
Brian
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