Recognize This Mac Manifold??

Scott Kneisel · Post by **Scott Kneisel** » Sun Dec 05, 2010 9:23 pm

Mc6 Carb Set-up 003.jpg: (246.78 KiB) Not downloaded yet

Mc6 Carb Set-up 002.jpg: (240.35 KiB) Not downloaded yet

Mc6 Carb Set-up 001.jpg: (187.3 KiB) Not downloaded yet

Hi Anybody recognize this manifold or know the vintage.
Carb 1 feeds into a reed block (looks like it is designed for a WB reed block but it has a Homlite in there).
Carb 2 feeds directly into the 3rd ports so it is designed for Mc9 and earlier engines.

It has "Acricast" MMV100 in the casting.

ted johnson · Post by **ted johnson** » Mon Dec 06, 2010 8:53 am

Scott, Ron has at least one of these. As you state, it's an Acricast. They were about like the Bug/Palmini units of the day. I never heard any other name for it. About the same '60 vintage, too. TJ

steveohara · Post by **steveohara** » Tue Dec 07, 2010 1:43 am

Scott,

Looks like one I have. It is an aftermarket top only designed to fit on the Mc 30 base manifold and reed cage to convert from single to dual carbs. Here is a pic of mine sitting on Mc 20. The manifold does not actually work on a Mc 20 as it was designed for the 30 with the enlarged opening under the manifold.
I have never run mine but I suspect it doesn't work worth a damn... the intake tract length is so long that it would be way out of tune at the higher rpms and I suspect that the amplification of the vibration in the engines would shake the carbs apart in a hurry.
Great looking show piece though... looks like some kind of mutation

Regards,
Steve O'Hara

steveohara · Post by **steveohara** » Tue Dec 07, 2010 1:58 am

Scott,

On closer inspection of your pics it looks like yours is a different version than mine. Mine has the same name but not that number and yours looks like the piece is designed to fit over the standard flat reed plate that came on the early Mac engines. Mine also has "Calimesa" cast into one side and I suspect that must have been the location of the manufacturer. Calimesa is a border town on the California side of the Mexico/California border.
I'm betting they were made before the Mc 40/70 manifolds were introduced and were promptly made obsolete by the OEM dual carb offering from McCulloch.
Time to dig out the 1961/1962/1963 kart magazines. I only have a couple from that era and they have almost no ads at all and even fewer pictures.
Steve O'Hara

ted johnson · Post by **ted johnson** » Tue Dec 07, 2010 9:19 am

Steve, the Acricast Ron has is a standalone dual manifold using the Homelite or West Bend reed for one carb, and feeding the third port with carb No. 2. We used to see them in "the day". The one Scott has is identical to Ron's unit. They predate the Mc30 manifold. If you look at Scott's photos, you can see that the base hole pattern mates directly to the Mac block. This design was a common one in '60/'61. The Bug manifold was very similar. They were an improvement over the stock setup, but not by more than 7-8%. Karting world did a multi-brand test back when, and the dual Reed Engineering unit was the best, if I remember. It was a mount/manifold combo that fed thru the bottom of the case. The G.E.M. dual bottom came along at about that time. They worked very well with the original manifold opening blocked off. TJ

Recognize This Mac Manifold??

Recognize This Mac Manifold??

Re: Recognize This Mac Manifold??

Re: Recognize This Mac Manifold??

Re: Recognize This Mac Manifold??

Re: Recognize This Mac Manifold??