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Alright, I Gotta Know!

B

Bryce Frazier

Well-known Member
I have been gathering motivation and smarts, and, if everything goes well tomorrow, I am going to put two Farmall M's together, and try to get a good one!!!! :)

Question is though, I have Carb issues. Main issue, I don't have a useable carb! :p

So, I THINK I can rebuild the one that came off of it, but the top half is REALLY rough. I just so happen to have a carb off of a T-9 International. Pops and I decided to break it in half, and see what it looked like. It is REALLY nice inside, nearly useable as is. Only issue we see is that the Venturi is larger in the 9 series, than it is on the M's.

Anyone know if this carb will work on the M engine? Dad (who is a carb wizzard) thinks that yes it will work, and if anything will just use a little more fuel.

I am thinking that if it will work, put it on for now, and somewhere down the road, pick up the proper carb and put it on there, but for now, I need a good strong tractor for logging, and I need it N O W! :(

What do you guys think??? Can't wait to get started on it, going to be quite the project!!! Will be lots of pictures of course!!! ;)

Bryce
 
Do the bolt holes and linkages line up? Sometimes a larger venturi means a wider throat on the intake manifold....

Ben
 
(quoted from post at 22:37:54 07/21/15) I have been gathering motivation and smarts, and, if everything goes well tomorrow, I am going to put two Farmall M's together, and try to get a good one!!!! :)

Question is though, I have Carb issues. Main issue, I don't have a useable carb! :p

So, I THINK I can rebuild the one that came off of it, but the top half is REALLY rough. I just so happen to have a carb off of a T-9 International. Pops and I decided to break it in half, and see what it looked like. It is REALLY nice inside, nearly useable as is. Only issue we see is that the Venturi is larger in the 9 series, than it is on the M's.

Anyone know if this carb will work on the M engine? Dad (who is a carb wizzard) thinks that yes it will work, and if anything will just use a little more fuel.

I am thinking that if it will work, put it on for now, and somewhere down the road, pick up the proper carb and put it on there, but for now, I need a good strong tractor for logging, and I need it N O W! :(

What do you guys think??? Can't wait to get started on it, going to be quite the project!!! Will be lots of pictures of course!!! ;)

Bryce
Click to expand...
ou would already know if you had bolted it on & tried it!
 
Thanks much for pointing that out, but like I said, I have to get the two tractors put TOGETHER before I am ready to put a carb on it!! :(
 
Yes, I checked, the two bolt holes for mounting it onto the manifold are the same size/distance apart, and then the distance from the center of those bolt holes to the face where the linkage hooks up is also the same, so, from a mechanical point of view, it will bolt right on.
 
If the carb bolts up it will run the engine. You might not see it idle quite as well as you would like but maybe it will be fine. You won't know till you try it out. I assume the M has fewer cubes so it might not suck enough air through the carb at idle to make the idle circuit work as well as it was designed for. I don't think the fuel economy will change much with the bigger carb. Let us know how it runs when you get it going.
 
In my years of building carburetors for competition go-kart engines we found that a smaller venturi meant better low speed and acceleration factors. A larger venturi would work best at a higher rpm as it passed a large volume of air meaning it would pick up more fuel also. It did not work well at low speeds as it would have trouble atomizing the fuel. Here though you are going to run the engine mostly at a constant high rpm and should therefore be good with the large venturi since it doesn't require fast acceleration.
 
hehehe, 10-4 buddy!

I think we are going to try to swap Venturi's first, but I think I want to try it with the bigger carb...
 
The venturi is sized to the engine. There is quite a diference in the engines, 248 ci on the M, 335 on the 9. Any chanced the venturi from the M can be switched to the carb from the 9? Or dig through the bone pile and find a venturi closer to the same size...

It might work, but then there might not be enough air passing through to consistently draw fuel on the main jet, be balky and have a hard time adjusting the main jet and keeping it running right. There may be other differences too, like the idle circuit air bleed and the location of the idle feed in relation to the throttle plate.

But, it might get you by. Won't hurt to try.
 
If you put the bigger carb on and adjust it properly (no black smoke out the exhaust), it should use exactly the same amount of fuel as the stock carb. The amount of fuel /air mixture that is used is not dependent on supply but demand. As others have pointed out, the idle circuit may be another story.

I personally would go for it and use it as a learning session. Either it will or it won't work.
 

The T9 carburetor will bolt up, but it has a much larger throttle bore and larger venturi. Quite a few tractor pullers WANT the T9, W9 carburetor for their highly modified Farmall M pulling tractors. Key word being "modified". The T9 carb will probably work on your stock M, but I doubt if you will be happy. There are lots of M carburetors out there, both used and rebuilt. Maybe you could trade the T9 carb for a stock, M carb?

On the other hand, unless your 2 M carburetors are physically damaged or broken, they CAN be rebuilt.
 
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