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pto dyno question


 
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clampdaddy
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PostPosted: Fri Jul 19, 2013 11:09 am    Post subject: pto dyno question Reply to specific post Reply with quote

Changing the primary reduction gears on a Deere changes the engine to tranny ratio so I was wondering, will it have an affect on horsepower numbers when its hooked to the dyno?
 
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north puller
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PostPosted: Fri Jul 19, 2013 11:59 am    Post subject: Re: pto dyno question Reply to specific post Reply with quote

If it is a transmission driven pto, then yes. If you slow down the
transmission by 10% (and therefore the pto by 10%) for
example, then you will have to turn the motor 10% faster to get
your "rated" 540 pto speed. You will end up reading whatever
horse power the engine makes at this new rpm.
 
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Roger in Iowa
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Location: Ottumwa, Iowa

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PostPosted: Fri Jul 19, 2013 12:29 pm    Post subject: Re: pto dyno question Reply to specific post Reply with quote

Engine will still make the same HP, just the dyno reads differently.

What brand of dyno?
 
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clampdaddy
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PostPosted: Fri Jul 19, 2013 12:52 pm    Post subject: Re: pto dyno question Reply to specific post Reply with quote

Roger in Iowa wrote:
(quoted from post at 21:29:17 07/19/13) Engine will still make the same HP, just the dyno reads differently.

What brand of dyno?


No dyno in particular, just curious if it would show a horsepower change even though the engine is still the same.
 
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buickanddeere
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PostPosted: Fri Jul 19, 2013 3:31 pm    Post subject: Re: pto dyno question Reply to specific post Reply with quote

If it did tractors would have a 1HP engine and
lots of gears to pull a 40ft chisel plough.
 
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showcrop
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PostPosted: Fri Jul 19, 2013 4:15 pm    Post subject: Re: pto dyno question Reply to specific post Reply with quote


Most dyno's you have to input the rpms so yes the reading would change.
 
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north puller
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PostPosted: Sat Jul 20, 2013 8:22 am    Post subject: Re: pto dyno question Reply to specific post Reply with quote

Some people don't get this, so i will try and explain in simple
terms.

I will use a farmall example, just because i know them.

With a little bit of work, a farmall m engine could go into a 560
or viva versa.

A super m makes 47 hp at a rated engine speed of 1450 rpm. If
you wind it up, it will make 53-55 hp at 1800 engine rpm.

now a 560 tractor is set up so that the engine turns 1800 rpm to
get 540 pto. If you put the super m engine into the 560 tractor
and put it on the dyno, the engine would turn faster (1800) to get
a 540 pto speed, and you would read 53 hp on the dyno.

Put that engine back into the super m tractor and put it on the
dyno, and it would turn 1450 to give you 540 pto and read 47 hp
on the dyno.

You are basically doing the same thing. You are changing the
engine rpm in relation to the pto rpm.since in the tractor world
hp is measured based on pto rpm, changing the engine input
speed will give you a different hp reading.

If you were to use a pony brake belt pulley dyno, you would see
no difference on your John Deere because the pulley speed
doesn't change with the gearing change.
 
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