Wide Open Throttle

[Hooked_on_HP]

Last week I had a branch come up and hold my throttle wide open.It scared the crap of me for fear of hurting the engine. The govenor is set at 3000 rpm and 540 pto is at 2450. I never run over 2500 rpm doing anything. I know heavy equiptment runs at full throttle all the time with no problems. Does any one operate their compact tractor at WOT.And if so what rpm is that.

 

[whitetiger]

I run my 1100 Ford wide open all any time I am mowing, bladeing or tilling. 2800 RPM

 

[cp1969]

It doesn't hurt anything. The engine has a governor. No matter where you set the throttle, the governor controls the rpm and running at max governed rpm is fine.

 

[Soundguy]

I run my old ford 8n at WOT to keep rpms up when mowing thick brush with my 5' mower.

Pto rpm is at about 1500 rpm or so.. in head height brush, i go WOT and that ups me to about 1800 rpm, out of a possible 2200 max on the gauge. Under that load.. the old girl can't get up any higher.

Soundguy

 

[john_bud]

The only downside is higher fuel use and more noise. If the tractor is real old with low oil pressure, there could be some issues, but doubt that is your case!

Machines are a lot better at keeping us idiots from destroying them than they used to be. Still best to operate the way you normally do!

jb

 

[Soundguy]

Generally, mechanical displacement gear type oil pumps produce more oil pressure as rpm rises. thus.. if you have your minimum 6 psi oil pressure at idle.. then you probably have more than that at WOT. Given that lots of the old machines are low rpm.. if you can kick 6-10 psi per thousand rpm.. you should be good to go.

I know lots of N's that have 10 psi at max throttle.. and 5 psi at idle...and work every day.

I know of a few that the needle 'moves' when it starts up, and they work every day... I.E. . -any- positive oil pressure was just barely good enough.

( of course.. that's what ford gets when they make a l-head engine with no replaceable cam bearings... )

Soundguy

 

[Charlesaf3]

As I understand the main issue is if you are under 50 hours - you don't want to run wide open during the break in period.

 

[Bird]

When running PTO powered equipment (mowers and tiller) I set the RPM at the manufacturer's PTO speed, and when I got on paved, public roads to go somewhere, I went to WOT.

 

[Doc_Bob]

As I understand the main issue is if you are under 50 hours - you don't want to run wide open during the break in period.

One NH dealer in WI for AG equipment routinely puts new equipment on a dyno and runs them near wide open under load before they deliver the tractor. All have less than 1 hour.
Bob

 

[Farmwithjunk]

One NH dealer in WI for AG equipment routinely puts new equipment on a dyno and runs them near wide open under load before they deliver the tractor. All have less than 1 hour.
Bob

I've owned a total of 5 new tractors in my lifetime. 4 were/are diesels. Those 4 were broke in from the get-go under heavy loads. (3 of the 4 were broke in on a plow) I can account for all 4 diesels today. One met a violent end when the crankshaft broke. That was resulting from a turbo being added and HP jacked up from 67 to over 100. The other 3 are still alive and well to this day. One has slightly over 3000 hours. #2 has over 5500 hours, and #3 has around 4500. NO ENGINE TROUBLES! No excessive oil consumption, no smoking under a load, good starting, and no odd noises. They were all "ran up" on a dyno at their respective dealers before I got them. That's the way a diesel should be broke in. (I still own 2 of them)

Diesels are normally governed to a safe RPM level. Wide open isn't excessive RPM's in those cases. One thing that can have adverse effects is "free revving". That's running an engine at maximum rpm's without any type of load on it. (i.e. a dyno, pulling a plow, ect) It's best to have some load on a diesel if it's revved up for long periods.