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Tractor Pulling Discussion Forum

Hey Terry B. (dyno issue)

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Mopower

01-30-2006 10:23:39




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Thanks for coming along to the meeting Sunday. I tend to be a bit leary of a dyno around at a pull. Like you said, if we ENFORCE the outside parts and appearance of engines for pure Farm Stock, the low speed limit takes care of the rest. It ought to be an interesting year to say the least. Your Dad was quite helpful in committee. Nobody wants to see Superstockers dropping back to our bread and butter classes. catch ya later.

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Terry in MI

01-31-2006 20:11:03




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 Re: Hey Terry B. (dyno issue) in reply to Mopower, 01-30-2006 10:23:39  
Hi Ethan, I thought the meeting went rather well. I don't think much about the dyno issue either. I believe the rules that state stock appearance covers this issue very well along with the 2.5 mph. As you said this 2.5 mph is an average mph. I think we could also have in the farm stock rules, to be low gear only. I would like to see the rules committee keep these rules as general as possible, such as we decided with the draw bar height. This will help cut down on the policing a great deal. Thanks for your time. Hope to see you at the next meeting.

Terry

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ChadS

01-30-2006 19:50:59




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 Re: Hey Terry B. (dyno issue) in reply to Mopower, 01-30-2006 10:23:39  
I think that could open up a safety issue. Lets suppose, you put a suspected stroker on the dyno, and she lets loose? If you want a close to stock engine clause, take a compression reading, and allow 10% over from a I&T shop manual, bout all the manuals Ive seen have specs on compression pressures. Dont wanna see someone get hurt from a dyno check, cause someones wants to cheat to win. just my honest opinion. Chad

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comfortking

01-31-2006 05:08:15




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 Re: Hey Terry B. (dyno issue) in reply to ChadS, 01-30-2006 19:50:59  
Compression is not fool proof either. Two nuts for rocker arm cover and a few twist of wrench and valves leak a lot of pressure or the decompression rockers on diesels being hidden on gas tractors. JDs leak out of the pit most of the time when being checked. Rpms and low gear will take care of most of our problems. If we class tractors by their advertized horse power and put them in the same classes we would not have 4000lb 110hp tractors pulling against B JDs or IH H, or Fords. If a tractor was sold new as a 50 hp tractor and the dry shipping weight was 6000 lbs, then pull it in all of the classes you want above 6000 lbs. Stock rpms and and 3mph or low gear your choice. I see very few Case tractors that pull but there are a lot of rules written to exclude them from getting in the Diet Classes. Strip a DC Case and spend a little money on it, then see how many places you are not allowed to pull; in the light weight classes. Dynos will not work, choke pulled out, fuel turned back, run on fuel tank with bad gas, stuck throttle linkage, these are just a few of the problems. I do not pull but put on a few pulls each year and for every action there is an opposite and unequal reaction.

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ChadS

01-31-2006 06:26:09




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 Re: Hey Terry B. (dyno issue) in reply to comfortking, 01-31-2006 05:08:15  
If a dyno is used in this situation, then the dyno operators need to have a proceedure, written in the rules, that this is how we will do this. and any attept to decive the dyno crew, they will de DQ"d on the spot and DQ dont mean dairy queen. That means, chokes are checked, petcocks closed. Sure, you can detune your tractor to decive, but if a tractor engine has been altered, well, if they have to turn the carb down, to make the dyno check, then there has to be another way to check them. Lets say you have a JD A come in, and Im not trying to pick on em,,, but, if the rules say stock, and the compression is over 130 psi, (and thats pretty good for a stock A) then that engine has been altered. an M IH, that has 200 psi, would be comsidered altered. A case DC, with over 170 is altered. the list can go on and on. Next time you have a I&T manual out, see if there is a compression pressure spec in the front of the book,, then, go out and check your tractor. I mean, come on,, if the rules say you have to be stock, or 10% over,, whatever, thats the rules you have to meet to pull that class. Chad

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Drew

01-30-2006 20:28:14




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 Re: Hey Terry B. (dyno issue) in reply to ChadS, 01-30-2006 19:50:59  
I agree with you on how it can become a safety issue. Another thing along the same lines is it could become a financial issue. You force someone to back up to the dyno and you squeeze their engine and it grenades, I can see a situation where fingers could get pointed at the dyno operator; reguardless of whether it is his fault or not or even if the engine is "stock" or not. So then whos pocket does it come out of?

And besides, there could be a whole book written about ways to cheat the dyno.

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ChadS

01-31-2006 06:32:20




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 Re: Hey Terry B. (dyno issue) in reply to Drew, 01-30-2006 20:28:14  
Sure it could be! if the dyno is used, then there has to be rules on how it is operated, and since all pto dyno's are used to check a 540 speed, then a wittness should be used, preferred to be a board member of the club, if it blows at 540, club is not responsible, if it blows at 535, then the dyno operator would be at fault, cause it did not go by the club proceedure. Clubs have to protect themselves in these situations, safety, and finacial. even a stock tractor can blow, but id bet a altered tractor would break before a stocker would. Chad

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AC

01-31-2006 04:23:32




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 Re: Hey Terry B. (dyno issue) in reply to Drew, 01-30-2006 20:28:14  
There is a whole book written about cheating about compression testing, and so on but I totally agree with you and ChadS. I think a compression reading would tell alot. Maybe up the cyl pressure limit a bit, incase there are some milled heads. Maybe like 165 psi..what do ya'll think? Is that too high? AC



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ChadS

01-31-2006 06:37:05




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 Re: Hey Terry B. (dyno issue) in reply to AC, 01-31-2006 04:23:32  
Ac, 165 for all, or a certain model? cause if a JD came in there at 165, something aint right. Ive seen at the race tracks, they usually check #1, and they have actually have a cyl that lags behind the rest of the others to pass inspection. they tear the heads off right there and find it. you check one cyl, you check them all. compression wont lie,, it would take some research, to learn what a engine would have in stock form. but once that line is drawn in the sand, you now have a rule that cant be bent. Chad

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TONY JOHNSON

01-31-2006 06:36:14




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 Re: Hey Terry B. (dyno issue) in reply to AC, 01-31-2006 04:23:32  
well you would have to squeeze the stroker all the way down? start to pull it down if a m has 75 horse and is 30 rpms from rated still, kick him out. its easy?you dont have to pull him down to rated to see his rated hp!!!



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ChadS

01-31-2006 06:38:11




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 Re: Hey Terry B. (dyno issue) in reply to TONY JOHNSON, 01-31-2006 06:36:14  
exactly right. Chad



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