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Tractor Pulling Discussion Forum

M engine balancing

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JonM

04-19-2005 20:45:13




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I just got my block and crank back from the auto shop, I am thinking about taking it to a guy who can balance the recip parts, does anyone have any comments on this, good or bad is it worth the money, the engine is not too wild 281 with flat tops and a 450 lp head,mild porting, reground cam to match, vinson stock replacement manifold, different spring in the gov. will probably not run more than 2000 rpm to stay within the rules, a little carb work, lite springs in the distributor,14.9 tires on 14" rims will also be used in the field a little, if a good 450 will run at 55 hp I'm hoping for 65 to 70, any comments?

thanx

JonM

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NEsota

04-20-2005 07:34:08




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 Re: M engine balancing in reply to JonM, 04-19-2005 20:45:13  
Tractor pulling and souping engins ain't my bag but as I interpert your post you are wanting to decide if it is worth the money to have this engine balanced. If that is correct you might try this method. Use a drug store banance-type of scale to find the lightest ring-piston-rod, then grind material off each of the others until they all weigh the same. You pullers probably are already familiar with this method.

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LW

04-20-2005 18:32:45




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 Re: M engine balancing in reply to NEsota, 04-20-2005 07:34:08  
The problem with that is the area on the big end travels around with the crank,So all big ends need to have the same weight. Then to get each rod equal all little ends need to be matched up. Then match the pistons rings and pins as a unit. THen you can take the crank for any inline engine in and have it balanced at reputable facility.If your not going to do it this way you shouldn't do anything you could make the problem bigger.

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farmall2

04-20-2005 06:00:51




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 Re: M engine balancing in reply to JonM, 04-19-2005 20:45:13  
Skip the Vinson manifold. Run stock 400-450 gas manifold. Much better flow



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CASEPOWER

04-19-2005 20:56:08




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 Re: M engine balancing in reply to JonM, 04-19-2005 20:45:13  
Very good idea for any engine!!



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JonM

04-19-2005 21:01:50




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 Re: M engine balancing in reply to CASEPOWER, 04-19-2005 20:56:08  
Jeez Casepower what a quick reply, thanks, I really like your mag, keep it up, do you think the 65 to 70 hp is realistic, i've been following your buildup, I don't want to spend all the cash to stroke the crank and get special pistons, just want something to look stock and get up and run decent

JonM



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Flogger

04-20-2005 04:49:11




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 Re: M engine balancing in reply to JonM, 04-19-2005 21:01:50  
65-70 HP sounds well within reach for what your building and balancing the rotating assy is good insurance. The only thing about running it in the field is that you may find you don't want to feed it the fuel it'll require. That LP head kinda turns up it's nose at pump gas.



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CASEPOWER

04-20-2005 04:42:10




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 Re: M engine balancing in reply to JonM, 04-19-2005 21:01:50  
I think it is possible to get a variety of numbers from that engine from 20 to 120 hp, depending on who's dyno your using. The important thing is to get all you can out of what you build. Balancing is money well spent. It will not only free up some HP, but last longer with less wear. Hp can't be guessed accurately on two engines the same size, using the same parts. If I run .005 clearance in the cylinders and you run .003, than our engines will create different HP, different operating temp, and wear at different rates. Bearings are the same also. Porting and cam grind will also be a factor. The builder has a role in the final HP and longevity of the engine. In my opinion, only a experienced engine builder, that has actually built the same engine many times, can judge the horsepower. Your numbers do sound sensible. Much more sensible than some I have heard.

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JonM

04-20-2005 13:41:40




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 Re: M engine balancing in reply to CASEPOWER, 04-20-2005 04:42:10  
Thanks guys, gonna get the balancing done, big swap meet this weekend maybe i can score on a different manifold, the field use will be hauling a couple wagons, or a little plowing with some other local antiques.

JonM



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