Dual groove crank pulley on repowered cub

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SamsFarm
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Dual groove crank pulley on repowered cub

Postby SamsFarm » Sat Jan 23, 2021 8:34 pm

I have a 1948 cub that been repowered with power unit engine at some time in the past.

It has a dual groove crank shaft pulley!

In its original application as a power unit, what was the extra pulley used for?

Side note, this engine really revs up!

Thank you!
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SamsFarm
501 Club
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Posts: 1350
Joined: Wed Jan 20, 2021 8:21 pm
Zip Code: 44410
Tractors Owned: 1968 Cub Fast Hitch
LF-1 Platform Carrier
144 Cultivators
L-F194 Plow(s)
F38 Disk
L-F3 Spring Tooth Harrow
Fast Hitch CS Bell 60 Grain Mill
Home Made Fast Hitch Potato Plow
54A Blade

Couple 1948 Cubs
172 Runner Planter
53 Fertilizer
Cub-3 Field Cultivator
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Mechanical Transplanter with side mount barrel (needs a fast hitch adapter) :)

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Re: Dual groove crank pulley on repowered cub

Postby SamsFarm » Sat Jan 23, 2021 8:38 pm

Engine serial # IMCUBM 31953

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John *.?-!.* cub owner
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Re: Dual groove crank pulley on repowered cub

Postby John *.?-!.* cub owner » Sat Jan 23, 2021 9:11 pm

I believe that was a combine engine, and the 2nd groove powered the auger for the unloader to empty the bin. I have a 47 my loader is on that I replaced an engine with a broken ear using one of those engines. The original owner of my replacement engine wanted the dual groove pulley back though.
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SamsFarm
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Couple 1948 Cubs
172 Runner Planter
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Re: Dual groove crank pulley on repowered cub

Postby SamsFarm » Sat Jan 23, 2021 10:10 pm

It is funny because I bought it at a consignment auction in Pa.

I was telling my brother how much faster it was, like it had a extra gear.

My brother was at a different auction here in Ohio, and was talking to a guy there.

For some reason he mentioned my cub being fast, the guy then described it to him asking him if that was it.

Here the guy my brother was talking to was the previous owner, and in fact said it did have a combine engine!

Small world!

But I had no clue what the extra groove was for!

Thank you!

SamsFarm
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Couple 1948 Cubs
172 Runner Planter
53 Fertilizer
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Mechanical Transplanter with side mount barrel (needs a fast hitch adapter) :)

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Re: Dual groove crank pulley on repowered cub

Postby SamsFarm » Sat Jan 23, 2021 10:13 pm

Anyone know the horsepower and rpm of these c60 combine engines?

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Re: Dual groove crank pulley on repowered cub

Postby tst » Sat Jan 23, 2021 10:51 pm

they used a governor that gave it more RPM, off the top of my head the #2250 rpm I think ?

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Re: Dual groove crank pulley on repowered cub

Postby Barebones » Sun Jan 24, 2021 5:19 am

My 1948 Cub doesn't have that dual pulley but it spins at 2650 RPMs. I had no idea it was different than others until I attended a Cub Fest at Rick Prentice's home in Ohio, where he was testing all comers on his dynamometer. The power band was exceptional, as well, and I still have the printout from the event. While sitting around the campfire that evening, others thought it could have a "power" generator. It doesn't sound like a typical Cub and not just because of the straight (no muffler) exhaust. No other explanations were offered, but I did some porting with the new 20-over bore and restoration work. Don't know if that alone accounts for the extra zip.

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Re: Dual groove crank pulley on repowered cub

Postby inairam » Sun Jan 24, 2021 10:37 am

tst wrote:they used a governor that gave it more RPM, off the top of my head the #2250 rpm I think ?


I have had all three governors ( power unit, cub and number cub) apart. the governor from the power units and the numbered cubs both use the same size weights but are different part numbers. The lighter weights let the c-60 run at 2400-2600 rpm in the cub. I think my stationary engine serial number plate is rated 2500 rpm. So you getting numbered cub HP in the standard cub and over 20% more turns with the same gears so it is faster.

The lighter weights do not have the tapper at the top.
When you only have 9 horsepower you need to know the names of all of the ponies!

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Re: Dual groove crank pulley on repowered cub

Postby jckengr » Sun Jan 24, 2021 9:19 pm

I can confirm that the engine with a second grove means the engine originally powered a combine. In my case it was a #60 pull type. The second grove was used for the unloading auger V belt.
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Re: Dual groove crank pulley on repowered cub

Postby outdoors4evr » Mon Jan 25, 2021 6:27 am

That second groove can now be used for a new purpose - install a hydraulic pump to run a bucket.
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SamsFarm
501 Club
501 Club
Posts: 1350
Joined: Wed Jan 20, 2021 8:21 pm
Zip Code: 44410
Tractors Owned: 1968 Cub Fast Hitch
LF-1 Platform Carrier
144 Cultivators
L-F194 Plow(s)
F38 Disk
L-F3 Spring Tooth Harrow
Fast Hitch CS Bell 60 Grain Mill
Home Made Fast Hitch Potato Plow
54A Blade

Couple 1948 Cubs
172 Runner Planter
53 Fertilizer
Cub-3 Field Cultivator
Cub-189 Two Way Plow
Cub-22 Sickle Bar Mower
Mechanical Transplanter with side mount barrel (needs a fast hitch adapter) :)

Misc Belly Mowers

Wish List
International 100 Fast Hitch Blade
Mott Fast Hitch Flail Mower

Wish Wish Wish List
Fast Hitch Rotary Hoe
4E hammer mill
Location: Ne Ohio

Re: Dual groove crank pulley on repowered cub

Postby SamsFarm » Mon Jan 25, 2021 4:23 pm

The thought crossed my mind for a extra hydraulic pump, but, for what I would not know.

Not to offend anyone, but I like cubs without a loader!

Have a much bigger Deere with a loader! :)


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