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pto rpm compared to motor

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a puller

03-17-2004 19:39:50

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I was wondering if I could figure how many rpm the motor was running by the pto rpm when the tractor is on the dyno?? I we have a 1950 A, 1952G, and 1941or42A....thanks alot....

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lynn

03-18-2004 17:51:20

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Re: pto rpm compared to motor in reply to a puller, 03-17-2004 19:39:50

a puller..multiply the pto speed by 975 and divide by 540..example at 450 pto rpm x 975 motor rpm divided by 540 equals 812 rpm..have to get out my dyno book to be sure but you can tweak the rpms a little bit as a g is rated at 535 and and a is 545..lynn

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a puller

03-18-2004 19:17:12

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Re: Re: pto rpm compared to motor in reply to lynn, 03-18-2004 17:51:20

thanks for the info. so say that I have the pto@700rpm...how would I figure out the engine rpm? I don't really know what two different figures are to figure out the difference and to come up with a ratio....thanks for the start...a puller

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lynn

03-19-2004 16:44:19

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Re: Re: Re: pto rpm compared to motor in reply to a puller, 03-18-2004 19:17:12

a puller..use the same formula and multiply the 975 rpm by 700 and divide by 540..this gives you 1264 rpm..i use the 540 on both g and a..if you use the 545 for an a it would 1252 rpm..lynn

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buickanddeere

03-18-2004 14:22:06

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Re: pto rpm compared to motor in reply to a puller, 03-17-2004 19:39:50

It's a ratio/proportion that doesn't change. Increase the engine rpm by 20% and the pto speed plus the wheel speed goes up 20%.

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a puller

03-18-2004 19:14:13

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Re: Re: pto rpm compared to motor in reply to buickanddeere , 03-18-2004 14:22:06

you don't happen to know what the ratio is though do ya? I am intersed in figuring rpm on the dyno to see how may motor rpm I am running....thanks alot, a puller

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Tom

03-17-2004 20:35:18

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Re: pto rpm compared to motor in reply to a puller, 03-17-2004 19:39:50

What you need to know here is the gear ratio between the engine and PTO. With the PTO engaged, crank the engine and note the number of rotations it makes for 1 rotation of the PTO shaft. So if you get, for example, 2.25 rotations of the engine for 1 rotation of the PTO shaft, then you can just multiply your PTO RPM by 2.25 to get engine RPM.
Another approach would be to look at the tractor specs for the engine. If rated RPM of the engine is, say, 1300 RPM under load with 540 RPM at the PTO, then the multiplier becomes 1300/540 to get engine RPM from PTO RPM. Short of knowing the exact gear ratio, the above approaches may give you a reasonably good estimate.

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a puller

03-17-2004 20:40:35

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Re: Re: pto rpm compared to motor in reply to Tom, 03-17-2004 20:35:18

thanks alot, now all I have to do is find a chart with pto rpm's and motor rpms...thanks...a puller

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ChadS

03-17-2004 20:03:31

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Re: pto rpm compared to motor in reply to a puller, 03-17-2004 19:39:50

A puller, I don't mean to talk BS with you here, but what is the deal? You really think that about me? No biggie, I can back up problems when things go wrong. I would not have it any other way sir. And you are right, let the customers decide. You know as well as I do that Good ol Denny will bend ya over and stick it to ya before he backs it up. Where have you seen me do that? Lies? Well, if that is your opinion, I can't say much. Just the fact that I am not like that. That hurt dude, may not be manly to say that, but geesh!! Should I have focused on a deere?

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a puller

03-17-2004 20:32:13

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Re: Re: pto rpm compared to motor in reply to ChadS, 03-17-2004 20:03:31

I have never seen you screw anyone over nor have I ever heard of you doing that....I think alot is just to put someone down to feel better..... you nkow..alot of times there's nothing better then to kick a man when he's down(eyes rolling..lol) I am with you..I don't understand it. I have been taught to respect all and treat them with God's love. I iknow it's hard to do. I just get fired up when people treat others like crap. I just want to make sure that I'm not just reading your post wrong..I dont' remember what I said if it was my opinion..or if your talkin about other peoples...lol...but I believe in honesty..and I haven't seen anything dishonest yet from ya..lol..take care....and have a good night...a puller

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ChadS

03-17-2004 20:54:52

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Re: Re: Re: pto rpm compared to motor in reply to a puller, 03-17-2004 20:32:13

Yeah it gets pretty sticky in here sometimes. Just like a pull!! I just take it with a grain of salt these days, yeah I wil blast back sometimes, but it does no good. I seen the posts below with ya about the rpm on the JD, it is a touchy subject, and no one knows beter than someone who has been around them right? It was the others I was talking about opinions, I feel the same. Honesty in this pulling world is kinda rare, but never overlooked. Some keep it a secret, and pass it on to generations to come, some share it. Me, I just want to be the best at what I do, not what other builders do, I don't build thier engines, I build em my way. And really the technology I use is not difficult to figure out. Heck I aint mad at all, never will be, don't hold grudges except for one on here, and he knows who he is. LOL. But hey! Keeps me on my toes. Most probably think Our shop is a big money operation, nothing is farther from the truth. Nope, just a lathe, mill, torch and a big ol hammer, Oh yeah the shoehorn, LOL. Some advice to all of ya, you guys need to stop looking at the make, and model for determining a potential HP output of an engine. Make and model has nothing to do with it, it is the technology inside that make it count. That is why when ya call all the big named builders for a quote,, yeah you will have a stroke all right!!! anyways, I am riled up too, we all have days like that, LOL take care, hope to see ya at Laotto. Chad

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a puller

03-18-2004 19:24:39

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Re: Re: Re: Re: pto rpm compared to motor in reply to ChadS, 03-17-2004 20:54:52

ya....I need to invest into a lathe and a mill, right now, we go down to my cousins shop and take parts to work to work on them. We have had rods bushed up at a local machine shop...but other then the cranks and boring, and the stuff that takes alot of major machine work, we do all the clearence work and port/polish and carb and mag work ourselves....with a high speed..lol...and a torch..lol..I prolly won't be able to go to this laotto pull, I haven't ever heard of it before..lol....I'm still in the monor leagues of pulling....our biggest class has like 45-55 pullers in them. in a few years, we will be takin a trip to this dekalb pull....what info do you have on some BIG pulls that have a good payback to travel a weekend to go to? thanks alot and have a good day...a puller

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ChadS

03-19-2004 07:08:01

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Re: Re: Re: Re: Re: pto rpm compared to motor in reply to a puller, 03-18-2004 19:24:39

EBAY!!! LOL Lots of good stuff in there for machine equipment. I am looking into a wire cutting machine, to make custom gears. It is a cnc, that uses a hair thin wire to cut the material. I found a few that look promising. Heck, I am not for sure about a pull with a good pay back, HA HA! But for some good pullin this summer, come on down to NCIATPA!! During fair weeks, there is about 8 pulls in 15 days. To me, that is a vacation. Our biggest show, is the Elkhart County fair, in Goshen Indiana during the last week of July. It is a distance pull, not percentage, we average over 225 hooks, and that is one hook per tractor per class. Normally it is 2 hooks per class, so if we ran the regular schedule, 450 hooks for a local club would be an awesome accomplishment for our board of director to put on a show like that. It is all in front of a huge grandstand full of fans, and the atpa pulls less than 20 ft away from us on the track right beside us. You get the feeling upclose, and personal!! A puller I made a mistake, and I want to apologize to you, I read the wrong IP address the other night, and I thought it was yours, it was close, off by 1 number. man I did not mean to jump the gun, Please accept my apology sir. Dekalb is a great event to go to if it is your first national event to attend. that is where braging rights start, and end there. it is a short, power track and takes power, and balance to do well there. Only thing I can say is, don't be afraid to second guess your tractor. the slightest change can mean a lot. Chad

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a puller

03-20-2004 06:50:25

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Re: Re: Re: Re: Re: Re: pto rpm compared to motor in reply to ChadS, 03-19-2004 07:08:01

I can't say I could go by the IP address because I made a post, and the guy that answered had the exact same address....

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dan

03-17-2004 19:51:07

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Re: pto rpm compared to motor in reply to a puller, 03-17-2004 19:39:50

our club has a chart that shows the pto rpm at factory,+10%,&+20%.for most of the models. i think it is from the nebraska test book.

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a puller

03-17-2004 20:02:26

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Re: Re: pto rpm compared to motor in reply to dan, 03-17-2004 19:51:07

I am just wondering that if say the dyno says that the pto is going 600rpm, how many rpm would the motor be goin? I guess I need to refresh my math and do some figuring..lol..thanks alot..a puller

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