IH 405004R91 carb vs zenit carb h on later cubs

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inairam
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IH 405004R91 carb vs zenit carb h on later cubs

Postby inairam » Wed Oct 12, 2016 9:44 am

There are a number of discussions about IH vs zenith carbs. I am interested if anyone has thoughts on the last IH carb the IH 405004R91 used on later cubs and I think early 154s vs zenith in terms of reliability and power on a late 70s cub. Thank you.
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Re: IH 405004R91 carb vs zenit carb h on later cubs

Postby Eugene » Wed Oct 12, 2016 10:07 am

Owing Cubs with both the IH and Zenith carburetors, there is no difference is power or reliability.
I have an excuse. CRS.

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Re: IH 405004R91 carb vs zenit carb h on later cubs

Postby Matt Kirsch » Wed Oct 12, 2016 1:29 pm

X2. Both carbs work equally well and there isn't enough difference in power output from one to the next to measure.

Most tuning you can do on a large car engine only nets you small gains there. Tuning that would net you 5HP on a big V8 engine won't get you 5HP more out of a Cub. It might net you .1HP on a Cub engine. A lot of work and expense to get you about as much extra power as putting a harness on your cat and hitching it to the tractor...

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Re: IH 405004R91 carb vs zenit carb h on later cubs

Postby LRiddle » Wed Oct 12, 2016 2:45 pm

Not to hijack the post, but it the zenith a direct bolt on replacement of the IH? Same throttle and carb linkages?
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inairam
501 Club
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Posts: 635
Joined: Wed Jul 08, 2015 10:24 am
Zip Code: 19342
Tractors Owned: 1948 with international 1000 loader
1949 with kub klipper belly mower.
1957 with c-2 mower & c-54 grader blade
1965 lo-boy with c-3 mower
1975 with homemade mower
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
Circle of Safety: Y
Location: Glen Mills PA

Re: IH 405004R91 carb vs zenit carb h on later cubs

Postby inairam » Wed Oct 12, 2016 3:42 pm

LRiddle wrote:Not to hijack the post, but it the zenith a direct bolt on replacement of the IH? Same throttle and carb linkages?


The zenith does bolt on the older manifolds, but you may need an extra gasket for to the throttle plate to clear. The zenith has a different air inlet tube and the linkage is somewhat different but not difficult.
When you only have 9 horsepower you need to know the names of all of the ponies!

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LRiddle
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1951 Farmall Cub - Chesty

Woods 59 belly mower

54A blade

1956 Gravely L

Dozer blade

Tiller

Rotary Plow
Circle of Safety: Y
Location: Tallmadge, OH

Re: IH 405004R91 carb vs zenit carb h on later cubs

Postby LRiddle » Wed Oct 12, 2016 3:45 pm

inairam wrote:
LRiddle wrote:Not to hijack the post, but it the zenith a direct bolt on replacement of the IH? Same throttle and carb linkages?


The zenith does bolt on the older manifolds, but you may need an extra gasket for to the throttle plate to clear. The zenith has a different air inlet tube and the linkage is somewhat different but not difficult.


I've actually replaced the old manifold with a new one since the old one was pitted and the exhaust was stripped. So it should bolt up. What about the linkages and the air inlet tube? Do those stich over too?
Luke Riddle
Tallmadge, Ohio
1951 Cub - Chesty



"You can't believe everything you read on the internet." - Abraham Lincoln


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