Re: 460 87 or 93 Octain

Posted by the tractor vet on April 15, 2005 at 07:47:03 from (4.124.74.231):

In Reply to: 460 87 or 93 Octain posted by GooseCreek Farms on April 15, 2005 at 04:29:01:

Well here we go again , yea it will run on 87 but that is not what the book calls for and you may get by just playen with your toy But since i have been there and done that i am tellen ya if you real work the tractor 87 will end up giving you problems . But hey it is your wallet and your time .Just take your toy out and put it on a set of plowes and sink them in the ground and go for it i am not just talken your garden that is 100 feet long and it will not take long or go out and grind a batch of feed running ear corn thru a small screen if the wrong oil don't get you the gas will. We use gas tractors they way they were ment to be used and yes i get a littel more out of them but so do you by rebuilding them with the overbore and step head pistons just what do you think makes poney power. They sure are not the way they came from the factory and we have one 460 over here that is used everyday on a manuar spreaderand untill we started using 93 octain in it you could only spread on the flats or down hill when pullen up hill it would get hot and start to seeze and it is bone stock. or if you tryed to grind feed if you shoveled to fast it would get hot and start to seeze . And since you can not get a forged piston for a gasser anymore and the cast pistons can't get ride of the heat fast enough they swell and melt .and if i am thinking correctly a 460-560 gasser required 90 octain unless you up graded a 560 to a 706 263 kit then you have to move up on the gas. I just wish i had the extra bucks to get a didital camra and show you what the pistons look like after they get hot . Keep in mind that i have been building engines for over 40 years anything from mild to wild from a blowen hemi to a turbo fords and even a coupel farm tractor gassers ( boy they would run but they sure made a lot of spare parts.) So if you guys think that i am kidding you on this and also think back to the mid 50 - the earlie 70's and just what was the gas that you bought at the pump reg at most stations were 95 octain reg and 100-105 high testand that is what these engines were ment to run on . The comp. ratio for the family sedan was on avg. 9.1 to 10 to 1 and if it had a 4 bbl. it was 10to1 to 11to 1 429 and 460 ford were 11 to1 390's came in two versions a prem. fuel 10.5 to 1 and a reg fuel 9.5 to 1 A 383 2bbl. was a 9.5 to1 and a 383 4bbl was 10.5 to 1 . then along came the tree huggers and down went comp. ratio and down went the fuel and along with it fuel milage . If you fallowed the engine building you would see what you had to do and even the parts books will tell you what you can get away with and what you can't .Just try and take a OLD 460 ford and rebuild it back to stock and see what happens with the 11 to 1 comp. the best that you can run on pump gas is a 9.3 to 1 and that is on the high test of today and you have to knock the timming back no more 38 degrees total at 2000 that don't fly. But hey what do i know .

Follow Ups:

• Re: 460 87 or 93 Octain Danny H 08:29:55 04/15/05 (1)
  • Run a compression test ChadS 10:59:56 04/15/05 (0)
• Re: 460 87 or 93 Octain ChadS 08:26:52 04/15/05 (0)

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