Sidedraft to downdraft

feel the need to change or modify your mutt? This is the place to discuss it.

Moderators: rickf, raymond, Mr. Recovery

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deputyvaughn
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Sidedraft to downdraft

Unread post by deputyvaughn » June 2nd, 2013, 2:16 pm

Does anyone know of a mod to change an M151 engine from the sidedraft Zenith carb to a downdraft. Is there an intake that will bolt straight up or will I have to fabricate an adapter. I once changed a MG Midget over by using a Datsun B210 intake (ports and spacing matched, just had to modify bolt pattern) and Datsun carb. The progressive 2 barrel made a major difference in performance.

Scott

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rickf
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Re: Sidedraft to downdraft

Unread post by rickf » June 2nd, 2013, 7:07 pm

I KNOW I answered this earlier???? There is no bolt on conversion, you will have to make an adapter. Mr Recovery modified a manifold to accept a different carb, he should chime in when he sees this. Just be aware that the exhaust manifold is the main limiting factor in the engines ability to breath.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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mrdibbles
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Re: Sidedraft to downdraft

Unread post by mrdibbles » June 2nd, 2013, 8:44 pm

I spent a ton of money modifying my M151A2 and honestly while the motor clearly looks better the performance really isn't there. Like Rick says the exhaust manifold really is the weak link...

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Mr. Recovery
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Re: Sidedraft to downdraft

Unread post by Mr. Recovery » June 2nd, 2013, 10:10 pm

I set 1 up with a Webber DOC32, it seems to run good just sitting in the tub, can't drive it at this point. My thought was to make it an easy swap back to stock. The last photo is a short Vid of it running, just click on it and it "should" play.


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1960 M151 Run 1
1963 M151 Willys DoD 10-63 in Baltimore
1989 Alley Cat. "work in Progress"
NRA Life Member
American Legion Post 275 Fl
US Army 6 years 2nd Armored Cavalry Bindlach Germany
Colorado Army Nat. Guard 5 years
Md Air Guard 15 years active duty on C-130's

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