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turbo on a cub


 
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Scott Blanchard
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PostPosted: Mon Jul 15, 2013 9:29 am    Post subject: turbo on a cub Reply to specific post Reply with quote

We have little group of farmall cub owners that get together and pull a couple times a year. The rules are any weight you want. I had heard that you can do a poor man's Turbo on a cub with a leaf blower or some other source of air blown into the air intake. Since we only have 9 horse to work with any improvement would be huge. I've done a very nice valve job and my motor, I believe is tight. I put a larger fuel line on and that has made a huge difference. Would this work? I was also thinking of hooking up to an air tank and just releasing a little air when I need it. Please don't laugh.
 
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ShaggyM
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PostPosted: Mon Jul 15, 2013 4:47 pm    Post subject: Re: turbo on a cub Reply to specific post Reply with quote

I think you would lean it out to much and it would either die out from not enought fuel or you would burn a valve.
Try rejetting the carb a little and maybe smoothing out the Venturi.
They do make High Alt pistons for the Cub
 
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wrockisland
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Joined: 12 Jul 2013
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PostPosted: Mon Jul 15, 2013 11:56 pm    Post subject: Re: turbo on a cub Reply to specific post Reply with quote

Get out the parts books and study the differences between your Cub's motor and the ones supplied with (I think?!) an IH baler. There is a Cub Low Boy in Northwest NJ with that mod that mows grass all day long in third gear.
Regarding your "turbo" idea, if you add air, you are going to have to add fuel. Keep in mind that you will be pressurizing the carb, which is pretty tricky business. A larger supply line, electric fuel pump, and larger jets will be necessary to pressurize the fuel system and deliver extra fuel. Your fuel pressure will need to be higher than your boosted air pressure.

While it might be fun to "boost" a cub, a job like that is gonna make a real mechanic out of you and might result in an expensive explosion during the process.

I'll see if I can nail down the model of the donor parts machine and post it tomorrow.

Good luck!
Steve
 
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wrockisland
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PostPosted: Tue Jul 16, 2013 7:24 am    Post subject: Re: turbo on a cub Reply to specific post Reply with quote

Here's a link to the (Holy Grail!) parts manual for the baler powerplant for sale on eBay:

http://www.ebay.com/itm/IH-International-engine-for-50-T-50-AW-baler-parts-catalog-manual-/350588808934?pt=LH_DefaultDomain_0&hash=item51a0b8aee6

IH Model 50-T baler, and 52R harvester thresher used the Cub motor, so keep your eyes open when you are scouting junk yards.

Good Luck,
Steve
 
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Buzzman72
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PostPosted: Tue Jul 16, 2013 7:31 am    Post subject: Re: turbo on a cub Reply to specific post Reply with quote

The 184/185 series Cubs had higher compression, and a considerably higher horsepower rating. But the governor was set up to run at a higher RPM also.

Pappy had a Cub he mowed with commercially back in the '60's, and he bought a 50T baler strictly for the Cub engine on it. The baler/power unit version of the C-60 engine was governed at 2250-2400 rpm. The baler governor assembly was swapped over to Pappy's Cub, and that tractor really came to life.

So if you want to look about jacking the power up on your Cub, the "secrets" have to do with more compression and higher rpm...kinda like the "big-boy" pullers.

[Side note: One evening on the way to a regular mowing job, Pappy saw that the local school corporation had their Cub out mowing a lot they owned along the street. Just for grins, Pappy wheeled his Cub off the street, and fell in behind the school's tractor, shifted into 2nd gear and started mowing behind but beside him. Pappy's Cub caught up with the school's tractor, and Pappy mowed right past him, came out at the cross street, raised the mower and shifted the PTO out, dropped his Cub into 3rd, and continued down the street. A week later, the head of maintenance at the school convinced the board that THEIR Cub was "just too small," and bids were taken on a new 140 with a Woods 59.]
 
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Buzzman72
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PostPosted: Tue Jul 16, 2013 7:35 am    Post subject: Re: turbo on a cub Reply to specific post Reply with quote

One more thing: to make the baler governor work best on the Cub, Pappy had to drill out the carburetor jet [not sure what size, but it was one or two drill sizes larger...then again, he had a set of Carter carburetor drill bits for such work].
 
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730-LP
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PostPosted: Tue Jul 16, 2013 11:04 am    Post subject: Re: turbo on a cub Reply to specific post Reply with quote

Milling the head on a flat head engine may increase compression but will decrease the air flow
 
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wrockisland
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PostPosted: Wed Jul 17, 2013 5:00 am    Post subject: Re: turbo on a cub Reply to specific post Reply with quote

That story put a smile on my face.
Your Pappy sounds like he was quite a guy!
Steve
 
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Buzzman72
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PostPosted: Thu Jul 18, 2013 4:53 pm    Post subject: Re: turbo on a cub Reply to specific post Reply with quote

Pappy WAS quite a guy...and I'm proud to be his son.
 
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