clampdaddy
Member
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?
- Thread starter clampdaddy
- Start date
north puller
Member
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.
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.
Roger in Iowa
Well-known Member
Engine will still make the same HP, just the dyno reads differently.
What brand of dyno?
What brand of dyno?
clampdaddy
Member
No dyno in particular, just curious if it would show a horsepower change even though the engine is still the same.
buickanddeere
Well-known Member
If it did tractors would have a 1HP engine and
lots of gears to pull a 40ft chisel plough.
lots of gears to pull a 40ft chisel plough.
north puller
Member
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.
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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