Re: M engine - How would you build it?

Posted by the tractor vet on August 09, 2007 at 07:07:17 from (75.19.124.211):

In Reply to: Re: M engine - How would you build it? posted by georgeky on August 08, 2007 at 20:36:17:

Well George back in the 60's and 70's till 75-76reg gas was 95 RMI octain and as we moved on from reg. leaded to unleaded and lower comp. backed off cam timing and ing. timing and on to fuel injection the levels dropped off . Clevit even did up a couple pages on this in one of there high po parts catologe tellen engine builder what pistons to order for what applacation and just how far we could go on comp. for the pump gas of today and they also made a big deal about the NEW and improved pistons as they were swinging away from the forged piston to the new silaca carbide castalum. and how they differed from the forged on heat dispersal . And at that time they were tellen us engine builder that for street use on at the time a 9to 1 was as high as we could go on the pump gas and at that time it was 95 octain and also made statement on the amount of timing on the top end . Now this was for car light truck engine building . Now when it comes to building a work engine ya take everything that you know about that and just throw it out the winder and start for the bottom and learn everyting over . The use of the 87 in the older tractors like in the letter seires and into the 400's-450 ya you can run it and get away with it but when ya get up in comp. with thew bigger pistons and smaller chamber heads like on the 400-450 with the BIG pistons that is when you will start seeing higher heat and detonation if that tractor still has the OLD advance curve and not the later curve as there was a kit that chaned from the old curve of the OLDER letter seires and this kit came around as they got away from the flat tops to the fire craters and domed pistons . It chopped 10-12 degrees off the topend of the curve.

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