Re: 706 looses power on long pulls

Posted by the tractor vet on May 11, 2007 at 12:51:26 from (75.19.120.63):

In Reply to: Re: 706 looses power on long pulls posted by chadd on May 11, 2007 at 11:54:26:

By backing off the timing she will run even hotter and cause plug fouling ,Ther is a vary fine line in the sand here on the C263 if it is stock your curb timing at idel is wright around TDc and running at full throttel the advace is around 23-24 , not much total advance here on the C291 you are at around 19 degrees BTDC and this new and IMPROVED gas MADE FOR CARS that realy do not work so to speak and running around and 8 compression ratio it is fine but not on a engine that is working hard . like i said many times before gas was a bunch different back before 1973 . Now showen my age here back when BIG TRCUKS still used gas engines they were in the 8to 1 compression ratio and they still had to run the OLD hightest and it was 105 or better at the pumps . And if ya wanted to be cheap back then when there was only 3 cents a gallon between the two that 3 cents ment that you would not make it far as it would wipe out the engine . I have played with cars trcuks and equipment since the 60's between drag racen to tractor pullen played with big trucks to the point of we found the weakness in the drive lines . Worked around many engeneers back during my days of drag racen when ya did not go to the big box store and buy your parts ya made them yourself or had them made . Since i bouht the first 706 like always i have worked tryen to get that last littel bit out of them and have made my far share of spare parts and when something happens i can look at the parts and tell ya as to why it happened . That is like this fuel thing on the 87 octain and we spent the BIG bucks to have a Lab test the fuel and from this EGG HEAD that did the testing and our long talk about this as to why ya can't use the socalled reg. of today and by ReaDING THE OWNERS MANUAL and it clearly states NOTHING LESS then 93 and go back to the 560 with the C263 here it states nothing laess then 89 , now her is the stumbeling block when ya do and over haul today on a 560 C263 you are now installing 706 C263 pistons in her so here again ya got to up the fuel . Way back when working with Ford at one point in time we were having a big problem with the 67 FE 360-390 engines as tooil burning and Ford came out with there test and it was to back up the ing. timing 5 degrees and drive the vehical for a half hour , now if ya want to see and engine get hot that is the way to do it . Along with backing up ing. timing ya make for harder starts and lots of accelaration stumbel . Now when i still had my COUGH choke Massey 300 combine with the go old trusty 225 slant six i was having a real problem with high engine temps , so i had to find out WHY i did everything from cleaning and boiling the rad. to speeded up the fan nothing helped when worken she would get real close to 250 . One day i was going out to the land of the Hoosier to a sale and they had gas at a price we could only wish for today as .689 a gallon for high test and back here it was .949 for hightest as that is what i ran in my f350 460 powered one ton and they had real FARM GAS at this station that had the GOOD old fashioned LEAD in it andit was now get this 95 octain where as there hightest car gas was 93 and the FARM GAS was at a price of 54.9 a gallon. Now i was just getting ready to run corn and i thought to myself here is a way to cut some cost out of the picture buy gas out here in Hoosier land . Oh wait how am i going to get it from out there to back here ????? I'll try and buy a couple 100 gallon fuel tanks . That is what i did i bought two 110 fuel tanks with pumps at the sale for 50 or 60 bucks and filled them on the way home . When i put that gas in the old massey the engine temp dropped down to 185-195 and stayed there . It was the reg. gas that i was tryen to run.

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