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Throttle plate and acceleration

C

CharlesRR

New User
Hoping someone knows the answer to this. I have a 1948 8n
and when I pull the throttle lever all the way to the far right I still
can manually go down by the governor and pull the throttle shaft
and get another 1/3 or so of acceleration. In other words the
throttle lever is not allowing me to fully accelerate. The throttle
rods are adjustable for a 1/4 inch or so, but this does not give
me much. I am short about an additional inch of travel.

Is the 8n designed or meant not to go to full acceleration?

Should I adjust this, and if so, how?

Thanks.
 
Do you have a proofmeter? I'm pretty sure 2200 rpms should be about your top end. Idk about your linkages sry.
 
Tim23, no I do not have a proof meter installed and working - long
story. I was just thinking of the problem mechanically and not
being practical about just figuring out what the high end should be
in the specs. I think I am going to pick up a LCD Tach and see what
she clocks in at. Still not sure where I go from there if she is below
where she should be.
 
welcome
Get your tach and check it against book spec for max rpm.
leave it be til then, tractors don't turn very fast compared to a car.(some off brands, amazingly so..'this can't be right'...yep, is)

Think about how a governor works.
Throttle lever at wide open, say 2200 rpms.
plowing tough ground, engine slowing, the governor
puts on the steam by allowing the throttle plate to open even more to compensate to keep rpms where you set the throttle lever.
load goes away, the governor closes the butterfly back down to
keep rpms steady. all without your input....nice.

Sure, reaching down to the carb and manually opening the butterfly, over-ruling the governor, will make the engine turn faster...........right to the 'bang,chunka,chunka,chunka' level :)

hope you never experience it, but having a governor to carb rod break or fall off on a running tractor, will show you just how fast and high tractor motors can rev while you are frantically reaching for the key to shut it down!!
 
NNP - Thanks. Definitely not looking for a bang, chunka-chunka.
I have heard it before. It is gut wrenching.

My plan is to just make sure the tractor is adjusted right. In general
plowing, discing and pulling dirt around with a box blade is easy
given the torque available and low speeds used.

The only real issue with the RPM's is the flail mower that gets used
several times a year for weed control. If the tractor is not
producing a solid high end the flail ain't flailin' so good.
 
NNP wrote:

"hope you never experience it, but having a governor to carb rod break or fall off on a running tractor, will show you just how fast and high tractor motors can rev while you are frantically reaching for the key to shut it down!!"

Definitely a depressing experience that happened to me and upon first start up in almost two months which made it even worse! It took a second for the oil pressure to shoot up and after cranking the throttle lever a couple of times, I frantically reached for the key and fortunately found it quickly -- long arms helped i guess.
Man, that experience hurt!

Governor rod had fallen off at carb -- which reminds me, I have to toughen up that little spring/cup connector.

Terry
 

It is not supposed to go to full open upon opening the throttle. It is not supposed to go full open until it is at full setting and a heavy load starts to pull the RPMs down.
 
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