Sidedraft to downdraft

M151 modifications, sugestions, and ideas, official MWO's and unofficial field mods

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deputyvaughn
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Sidedraft to downdraft

Post by deputyvaughn » Sat Jun 01, 2013 12:30 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
Jeep: I may get lost, but I won't get stuck.

Rickf
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Re: Sidedraft to downdraft

Post by Rickf » Sat Jun 01, 2013 2:25 pm

there is no bolt on, you will have to build an adapter. Mr. Recovery on here modified a manifold for a different carb. He will probably chime in when he see's this. Keep in mind that the exhaust manifold is the limiting factor in airflow through these engines.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

deputyvaughn
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Re: Sidedraft to downdraft

Post by deputyvaughn » Tue Dec 03, 2013 11:44 am

Did it. Had an adapter made and installed it. Works pretty good....still have to perfect the throttle linkage.

Scott

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Jeep: I may get lost, but I won't get stuck.

Rickf
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Re: Sidedraft to downdraft

Post by Rickf » Tue Dec 03, 2013 1:09 pm

Where you gonna put the air cleaner? Looks like zero clearance to the hood. And that is not a 151, what is that in?
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

deputyvaughn
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Re: Sidedraft to downdraft

Post by deputyvaughn » Tue Dec 03, 2013 1:41 pm

It's a 62 model CJ5 with a M151 drive train (crossbread at the drive shafts). I have the breather cap from a f134 carb and the hood does close over it. I'm working on retrofitting a paper filter into an oil bath canister for an air filter.

Scott
Jeep: I may get lost, but I won't get stuck.


Rickf
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Re: Sidedraft to downdraft

Post by Rickf » Tue Dec 03, 2013 1:45 pm

Well that is definitely a unique combination.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

deputyvaughn
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Re: Sidedraft to downdraft

Post by deputyvaughn » Tue Dec 03, 2013 5:50 pm

Got to work with what you got....LOL
there are several old post in the CJ section about some of the other mods I've done....Nissan brake booster, swing pedals from a Mazda, hydrolic clutch....
When I bought it, the M151 drive train was already in it....I figure I can do what I want without worrying about originality.

Scott
Jeep: I may get lost, but I won't get stuck.

Rickf
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Re: Sidedraft to downdraft

Post by Rickf » Wed Dec 04, 2013 4:38 am

Well you got the non-originality covered that is for sure! :roll: :lol: :lol: :lol:
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

gem1410
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Re: Sidedraft to downdraft

Post by gem1410 » Tue Jun 17, 2014 7:04 pm

how does it run with the new carb and how much did the adapter cost--any pictures of the whole jeep

deputyvaughn
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Re: Sidedraft to downdraft

Post by deputyvaughn » Mon Feb 23, 2015 11:36 am

Not intending to revive an old thread, but to answer the last posts....
gem1410, I paid a local welder $30 to fab that adapter for me. I told him what I wanted and gave him a carb gasket to make the flanges fit. The only problem I have is icing in the winter. When I first start up the fuel going through will cause ice to accumulate on the outside of the adapter. I'm still thinking on my solution for that. Once warmed up (about 2 minutes) no problems at all.

I'll try to post a few pics of the whole jeep. If this works, the first will be with the complete hardtop. The next will be after i cut it down to a half cab.
Scott

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Jeep: I may get lost, but I won't get stuck.

deputyvaughn
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Re: Sidedraft to downdraft

Post by deputyvaughn » Mon Feb 23, 2015 3:04 pm

BTW, the pics by the woods were taken while on a test drive after installing the half cab. I had forgotten to fill my gas tank and was waiting for the wife to bring fuel.....LOL.

Scott
Jeep: I may get lost, but I won't get stuck.

gpw6335
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Re: Sidedraft to downdraft

Post by gpw6335 » Sun Mar 29, 2015 6:02 pm

Nice looking jeep had to involve lots of mods,
1943 GPW 103951
1951 M38 27714
1952 M38a1 28888
1969 M274A5
1972 M151A2
1943 MBT
1951 M100
1979 M416
1962 M37B1

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