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ChadS
08-05-2003 16:49:35
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Re: Re: Re: What to do to an M/450 engine in reply to Flogger, 08-05-2003 14:58:18
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I understand the confusion. I apologise. I would like to explain what I,m doing here. Ok, Lets start with a rebuild kit. High dome or stepped head (M&W or IH) pistons come out of the top of the block a 1/2 inch or so. the "step" is also the same shape as the combustion chamber of the head. With the 8060 or a 450 head can be machined down about 125 max. I like to keep it around 100 that I take off the head itself. I use a .020 thick copper head gasket. Stock gasket thickness is around .072 compressed. So you lose another .052 from the gasket. So, Its just like milling the head beyond its ability. You may not have to cut the pistons for clearence
between the head and piston. Ok now to the rods. Using a 450 kit, that has the small dia. wrist pin. The M rod has a large wrist pin. Make a brass bushing to adapt the small wrist pin to the large rod. Offset the pin bore so its at the highest point on the rod. You can move the piston upwards atleast .250 easy! same thing as lengthening the rod, or stroking the crank, without actually doing it.The engine I put together like this started out with 175psi, Iended up with 225psi. This is good for 15 hp easy! Now on to fuel, Like I have said in the past, I am a firm beliver in ethanol. It makes power at low rpms (Up to 2800rpms) When I convert the tractor to this fuel I pick up 8-12 hp by fuel alone, and properly matching the carb to the engine. I will give you another example with another tractor I built 2 years ago, It is a SH Farmall with a 350 kit with M&W high compression pistons. We left it alone the first time, dynoed 43 hp. We then tore it back apart and used H rods instead of the 350 rods. Offset the pistons and put it back together again. Its now 55 hp, just by doing that alone, without the copper gasket. On the ethanol fuel. Here is another example... I have a H with a small stroker. 3-13/16 bore and 5.25 stroke. 239ci. It has 225 psi and is 70+hp. I wish I could tell you the mathmatical figure to figure cubic inch, compression ratio, to figure HP. Maybe someone outhere knows if there is such an equasion. A stock engine has so much potential for a div2 class, if you know some of the tricks of the trade. You could change cams, it may help even more, But building compression, dyno tuning, using a good fuel, and the right carb, Getting it right, and building from there, then the HP numbers start growing, not backing up. Let me know what you think. It is real easy to do this method and possibly save some money. This is what can be done without breaking a budget. ChadS
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