All Small Six Winter Project: Better breathing with a large log

[awasson]

I have often thought two 32/36 mounted like you describe would work really well. It could very well overcome much of the limitation of the log design. And you would get to enjoy the experience of flooring it and feeling the secondary's kick in! A flat top log head will fit a 2100 with machining and adapter mounted and the 32/36 is likely smaller base dimensions. The air cleaner would require some planning.

I was just looking at the log on my C9 head. The area where I would like to mount the carburetors is 2-1/8” (outside dimensions) at it’s most narrow point. I could get aluminum stock that I could machine for the 2V bores and mounting studs. Then I’d bolt and epoxy them to the log.

 

[DON]

My modified intake ( 2 barrel) has steel for the base and is brazed.
Myself, I think I would rather bolt it up instead of epoxy. I just don’t know if I would trust epoxy long term. I was checking into repairing a motorcycle gas tank with epoxy and there are people that have had problems and I don’t recall the directions saying it was impervious to gas. Just resistant. Two different things in my mind

 

[wme013]

Why stop at just 2 carbs?
Offenhauser 5970 or Offenhauser 5205
Although the SU's are way cool too.

 

[awasson]

My modified intake ( 2 barrel) has steel for the base and is brazed.
Myself, I think I would rather bolt it up instead of epoxy. I just don’t know if I would trust epoxy long term. I was checking into repairing a motorcycle gas tank with epoxy and there are people that have had problems and I don’t recall the directions saying it was impervious to gas. Just resistant. Two different things in my mind

I was just looking at the photos of yours. The braised steel plate looks like a good way to go. I would hope the brass would resist cracking from heat expansion too. That while whole head looks really decent.

 

[awasson]

Why stop at just 2 carbs?
Offenhauser 5970 or Offenhauser 5205
Although the SU's are way cool too.

What carbs are on that Offy intake? Are those Carter YF’s, some kind of Holley or something similar? That might be a better route after all. I’m not committed yet. I just want to make sure that whatever direction I choose will flow the best given the nature of the log intake.

 

[wme013]

Not familiar with either Holley # 1921-S or #2227-1A the Offy is listed to use in this app.
I think the 1921 is the 2 ends and the 222-1A is the center carb…
:
Not seen on Holley site or on fleebay either.
1904 too expensive…
can U use 3 of the same carbs?
How bout 3 sm YFs?

https://www.youtube.com/@VivaLaCruise
He has a multi post installation instruction

 

[DON]

I was just looking at the photos of yours. The braised steel plate looks like a good way to go. I would hope the brass would resist cracking from heat expansion too. That while head looks really decent.

I am not worried about cracking from heat. Fresh air/fuel flowing thru, water flowing thru block that’s what? 189-190 degrees. I can’t see the intake log getting over 200. Not sure of the metallic properties, but I would think brass would be more flexible than case iron. But more problems probably arise from different metals being attached to each other

 

[awasson]

I am not worried about cracking from heat. Fresh air/fuel flowing thru, water flowing thru block that’s what? 189-190 degrees. I can’t see the intake log getting over 200. Not sure of the metallic properties, but I would think brass would be more flexible than case iron. But more problems probably arise from different metals being attached to each other

Yep, that’s what I meant but didn’t explain it very well. Brass is flexible and should be safe from cracking. Epoxy would certainly crack before a braised piece.

 

[Frank]

With headers the intake will be quite cool relatively. 36* temp drop below ambient is the air/fuel entering the intake at the carb base.