Posted by the tractor vet on October 29, 2007 at 10:26:05 from (75.19.120.169):
In Reply to: what octane gas to run? posted by new 560 owner in ks on October 29, 2007 at 10:04:19:
Ya may be ok on the 91 BUT make darn sure that your ing. timing is dead on the money at rated RPM . AND DO NOT TRY AND WEEN BACK ON THE MAIN FUEL SCREW ON THE CARB. Ya have to keep in mind that over the ears that that head has been off and has been milled down to take the warp out of it and also even though it is a 560 with the supposely C263 ya just may find that it has been upgraded to a 706 C263 or even a C291 . Just like most old tractors when it came time to overhaul the shop would ask if ya wanted a few more ponys and i have NEVER meet a farmer that did not want more. ANd when ya asked them it was just about always the same answer well just how much more can ya get me . So with the head being milled down god only knows how many times and the moving up to the 706 pistons that ups the comp. ratio and therefore up HP. and the need for a better grade of fuel is needed . Now it is like this if ya hear it octane ping you can almost bet your bippy that it is already to late. as with engine noise and gear train noise on a tractor it is at times hard to hear it till the vary last second before she lock up . And don't think that i will see the temp gauge going up as when they super heat on the top of the piston it happens so fast that that heat never has the time to sink into the coolant.
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