|
ChadS
11-03-2004 06:55:08
|
|
Re: super m winter project in reply to jjgmc, 11-02-2004 15:42:14
|
|
| |
At what weight? One thing to consider on the Super M, was they had faster transmission gear in them (2nd gear-4th) Low gears were close to the same as the M. Lets talk HP for a moment. First, lets start with the M's the M will not make as much HP as the Super M with the same pistons I have. Now one can get the upgrades to make the M match the super M potential, but that involves, Using the same cyl head, and the cam that the Super M-450 uses in the M engine. The old cyl heads, (8060D high compression gas M head) those compression chambers are deep. Much more cc's than than the newer style cyl heads. so you dont gain as much compression using the M head as you would the Super M-450 heads. The M cam, is the old cam grind, it does not create the torque that the newer cams do, I seen that on the dyno right off the bat, All, Super M-450 that I have dynoed, all will have a 20 hp torque curve below 540 and then drop off hp, the M will only have 12-15 hp jump before it falls off. I call that "lugging power" (this is after I rejet the carb, change the governor spring, and calibrate the timing on the dyno) And I'll tell you how to tune it just like I did for everyone else it is easy, and will save you alot of $$, and headaches. more on that later,, LOL. HP estimate for the M's and I use estimate because not all M's are equally strong in HP no matter what any one says. My pistons in the M's will make 150 psi with a 4-1/8 bore, that makes it a 281ci in. 65 hp, using an 8060 head and M cam. That is with the carb rejetted, 94 octane fuel and the governor spring, and the distributor in good shape. I only offer 4-1/8 bore, small wrist pin pistons for the M-450. Now with these pistons in the Super M-450. Still 281 cubes, but now the good cam, and the newer cyl head is added to spice things up a bit. (which is what you have if it a Super M) The newer cyl head will make 30 psi more than the old 8060 head. So that bumps it up to 180psi, (with a stock not milled cyl head from the SM-450) But the engines charateristics are much better. The head and cam really brings the engine to life. A stronger torque curve, more HP at 540 from the difference in compression pressures, cyl head design and the cam grind. In my opinion, the Super M-450 tractors are the ones to pull inthe heavy classes VS the M cause they can hang on longer in the lugging. Simply put, these engine have more torque in the rpm ranges below 1300 engine rpms. With 281 cubes, 180psi, good cam and head, properly rejetted carb, timing, and governor tuned, 72-75 hp at 540. With the potential for more!!! You could mill the head and get it up to 200 psi and be stronger yet! One thing I want to point out, is that you cant just slap these things together and go pulling and expect them to be right, right off the bat. The tractor, is as good as the work YOU put into it. So if you want to do the little work that makes them great, I and everyone here on this site will be more than happy to help. Sure they wont like it if you take their money,, but hey,, bragging rights rite?? LOL. Give or take a few Hp because it depends on the fuel you use in them. ChadS
|
|
|
