- Thread starter Carl K
- Start date
Could also be the carb.
Did the old gauge work? If so, did it indicate the correct speeds?
Was anything done to the carb in between running on different gauges?
I'm not impressed with the aftermarket proof-meters.
But, when they are off, normally they are consistently wrong.
Different carbs bolted on my 8N will run the RPM's all over the
place. So much so that I record the idle and high end RPM of
every carb I rebuild before I send it back to the owner.
I know my governor works correctly and the tractor runs right,
so if the idle or high end performance is off, the carb isn't right.
Makes me more work when it happens, but I sleep well when done.
Did the old gauge work? If so, did it indicate the correct speeds?
Was anything done to the carb in between running on different gauges?
I'm not impressed with the aftermarket proof-meters.
But, when they are off, normally they are consistently wrong.
Different carbs bolted on my 8N will run the RPM's all over the
place. So much so that I record the idle and high end RPM of
every carb I rebuild before I send it back to the owner.
I know my governor works correctly and the tractor runs right,
so if the idle or high end performance is off, the carb isn't right.
Makes me more work when it happens, but I sleep well when done.
ust curious, but what do you change on the carb to make each one match the same governed speed on the test tractor?(quoted from post at 22:43:27 10/11/16) Could also be the carb.
Did the old gauge work? If so, did it indicate the correct speeds?
Was anything done to the carb in between running on different gauges?
I'm not impressed with the aftermarket proof-meters.
But, when they are off, normally they are consistently wrong.
Different carbs bolted on my 8N will run the RPM's all over the
place. So much so that I record the idle and high end RPM of
every carb I rebuild before I send it back to the owner.
I know my governor works correctly and the tractor runs right,
so if the idle or high end performance is off, the carb isn't right.
Makes me more work when it happens, but I sleep well when done.
They do not all match the same governed speed exactly, even on my tractor.(quoted from post at 23:48:53 10/11/16)ust curious, but what do you change on the carb to make each one match the same governed speed on the test tractor?(quoted from post at 22:43:27 10/11/16) Could also be the carb.
Did the old gauge work? If so, did it indicate the correct speeds?
Was anything done to the carb in between running on different gauges?
I'm not impressed with the aftermarket proof-meters.
But, when they are off, normally they are consistently wrong.
Different carbs bolted on my 8N will run the RPM's all over the
place. So much so that I record the idle and high end RPM of
every carb I rebuild before I send it back to the owner.
I know my governor works correctly and the tractor runs right,
so if the idle or high end performance is off, the carb isn't right.
Makes me more work when it happens, but I sleep well when done.
If they did, I wouldn't need a record. But they all end up very close.
If I can't get 1800 RPM's out of one there's a problem. Possibly
not enough fuel flow which I know is good in the rest of the system.
If I can't get it to idle under 500 RPM's there's a problem.
May be throttle shaft/plate binding for example.
Those problems get fixed.
The governor isn't powerful enough to overcome mechanical
binding and it certainly can't open clogged passageways.
Testing on a known system makes that readily apparent.
k, got it. If not close on governed speed, something still needs repair in carb.....not done yet. You did say that......I just didn't catch. Thanks for clarification, as my first read was that a good working carb might still be "all over the place " on governed speed.(quoted from post at 00:18:09 10/12/16)They do not all match the same governed speed exactly, even on my tractor.(quoted from post at 23:48:53 10/11/16)ust curious, but what do you change on the carb to make each one match the same governed speed on the test tractor?(quoted from post at 22:43:27 10/11/16) Could also be the carb.
Did the old gauge work? If so, did it indicate the correct speeds?
Was anything done to the carb in between running on different gauges?
I'm not impressed with the aftermarket proof-meters.
But, when they are off, normally they are consistently wrong.
Different carbs bolted on my 8N will run the RPM's all over the
place. So much so that I record the idle and high end RPM of
every carb I rebuild before I send it back to the owner.
I know my governor works correctly and the tractor runs right,
so if the idle or high end performance is off, the carb isn't right.
Makes me more work when it happens, but I sleep well when done.
If they did, I wouldn't need a record. But they all end up very close.
If I can't get 1800 RPM's out of one there's a problem. Possibly
not enough fuel flow which I know is good in the rest of the system.
If I can't get it to idle under 500 RPM's there's a problem.
May be throttle shaft/plate binding for example.
Those problems get fixed.
The governor isn't powerful enough to overcome mechanical
binding and it certainly can't open clogged passageways.
Testing on a known system makes that readily apparent.
I can see how it may have sounded that way, but no, they are not(quoted from post at 10:21:46 10/12/16)k, got it. If not close on governed speed, something still needs repair in carb.....not done yet. You did say that......I just didn't catch. Thanks for clarification, as my first read was that a good working carb might still be "all over the place " on governed speed.(quoted from post at 00:18:09 10/12/16)They do not all match the same governed speed exactly, even on my tractor.(quoted from post at 23:48:53 10/11/16)ust curious, but what do you change on the carb to make each one match the same governed speed on the test tractor?(quoted from post at 22:43:27 10/11/16) Could also be the carb.
Did the old gauge work? If so, did it indicate the correct speeds?
Was anything done to the carb in between running on different gauges?
I'm not impressed with the aftermarket proof-meters.
But, when they are off, normally they are consistently wrong.
Different carbs bolted on my 8N will run the RPM's all over the
place. So much so that I record the idle and high end RPM of
every carb I rebuild before I send it back to the owner.
I know my governor works correctly and the tractor runs right,
so if the idle or high end performance is off, the carb isn't right.
Makes me more work when it happens, but I sleep well when done.
If they did, I wouldn't need a record. But they all end up very close.
If I can't get 1800 RPM's out of one there's a problem. Possibly
not enough fuel flow which I know is good in the rest of the system.
If I can't get it to idle under 500 RPM's there's a problem.
May be throttle shaft/plate binding for example.
Those problems get fixed.
The governor isn't powerful enough to overcome mechanical
binding and it certainly can't open clogged passageways.
Testing on a known system makes that readily apparent.
all over the place once fixed. Only when they're not quite right yet.
Not many have a problem, but if they do, they don't leave here that way.
That's why I test and adjust every one I rebuild. Some more than once.
ounds like you are about as through as Gary! I like that attitude & commitment!(quoted from post at 00:03:09 10/13/16)I can see how it may have sounded that way, but no, they are not(quoted from post at 10:21:46 10/12/16)k, got it. If not close on governed speed, something still needs repair in carb.....not done yet. You did say that......I just didn't catch. Thanks for clarification, as my first read was that a good working carb might still be "all over the place " on governed speed.(quoted from post at 00:18:09 10/12/16)They do not all match the same governed speed exactly, even on my tractor.(quoted from post at 23:48:53 10/11/16)ust curious, but what do you change on the carb to make each one match the same governed speed on the test tractor?(quoted from post at 22:43:27 10/11/16) Could also be the carb.
Did the old gauge work? If so, did it indicate the correct speeds?
Was anything done to the carb in between running on different gauges?
I'm not impressed with the aftermarket proof-meters.
But, when they are off, normally they are consistently wrong.
Different carbs bolted on my 8N will run the RPM's all over the
place. So much so that I record the idle and high end RPM of
every carb I rebuild before I send it back to the owner.
I know my governor works correctly and the tractor runs right,
so if the idle or high end performance is off, the carb isn't right.
Makes me more work when it happens, but I sleep well when done.
If they did, I wouldn't need a record. But they all end up very close.
If I can't get 1800 RPM's out of one there's a problem. Possibly
not enough fuel flow which I know is good in the rest of the system.
If I can't get it to idle under 500 RPM's there's a problem.
May be throttle shaft/plate binding for example.
Those problems get fixed.
The governor isn't powerful enough to overcome mechanical
binding and it certainly can't open clogged passageways.
Testing on a known system makes that readily apparent.
all over the place once fixed. Only when they're not quite right yet.
Not many have a problem, but if they do, they don't leave here that way.
That's why I test and adjust every one I rebuild. Some more than once.
Carl.............sounds like you need a little lesson in carburator tuning. Here's what I recommend. Set yer down-pointing main jet to 2-turns and LEAVITT. Adjust yer side-pointing idlemix fer FASTEST idle, NOT smoothest idle. Understand the difference? Usually its about 1/8-1/4 turn. Don't worry about the 2200-rpms. Most of yer tractor work engine speed will be about 1500-rpms. BTW, in the late 40's, they used N-engines fer 1/4-mile midget racing. Engine speeds upto 4000-rpms. .........HTH, the amazed Dell
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