I have 2 Mc2's on my shelf right now. Just finished both of them. One is mine, one is Chris M's. They are pretty cool, they are 100cc and use an Mc7 crank and piston, just the rod is different. It looks like an mc7 rod but has a slot in the bottom and a split bushing that fits where the needle bearings go on all the other Macs.
I am also restoring an Mc1 which has a totally different crank and rod. The crank has a larger crank pin and the rod is aluminum like a Clinton rod.
Get this, the block is similar to an Mc15 saw block but only has 3 intake ports drilled (one on the front side and 2 on the back side), two exhaust ports drilled and no 3rd ports. It also has a bushing piston pin and is 80cc. Float carb that you can't even get your little finger thru and 2 miniature reeds.
Must have been a SCREEMER!!!!! LMAO
Junior Vintage Engines
Moderator: Rob Voska
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Scott Kneisel
- Posts: 477
- Joined: Mon Mar 24, 2008 7:48 pm
- Vintage Karting items owned: '63 Rupp Grand Prix, 66 Rupp Chappy, Mc6's, Mc8, Mc10's, Mc20's
Lotsa' other Macs - User Agreement: Yes
- Location: Farmington, NY
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steveohara
- Posts: 411
- Joined: Thu Jul 19, 2007 2:29 am
- Vintage Karting items owned: 1969 Bug Sprint Mc 91B1
1965 Dart Gran Prix twin Mc100s
1963 Bug Scorpion ESll Mc45
Re: Junior Vintage Engines
Scott,
A friend just sent me another Mac 2 and it doesn't have an intake manifold. Just wondering what the Mac 2s you have are fitted with for a reed petal and guard? Are they the thin metal version or the phenolic reeds?
What about the guard.... do they have the full formed cover, the thin metal arms that plug into the plate or the tapered metal shape like the later models?
The Mc 2 in my collection was built from parts so I don't rely on it as a reference for what is correct.
Regards,
Steve O'Hara
A friend just sent me another Mac 2 and it doesn't have an intake manifold. Just wondering what the Mac 2s you have are fitted with for a reed petal and guard? Are they the thin metal version or the phenolic reeds?
What about the guard.... do they have the full formed cover, the thin metal arms that plug into the plate or the tapered metal shape like the later models?
The Mc 2 in my collection was built from parts so I don't rely on it as a reference for what is correct.
Regards,
Steve O'Hara
-
Scott Kneisel
- Posts: 477
- Joined: Mon Mar 24, 2008 7:48 pm
- Vintage Karting items owned: '63 Rupp Grand Prix, 66 Rupp Chappy, Mc6's, Mc8, Mc10's, Mc20's
Lotsa' other Macs - User Agreement: Yes
- Location: Farmington, NY
Re: Junior Vintage Engines
Steve,
Only one had a manifold and it had an untapped shroud tab on it unlike what is shown in the IPL. The reed plate had no reed guard at all. It was a phenolic reed with just a flat plate and lock tab. With the ribs in the Mc2 block, it didn't really need as guard or stop, the ribs do that. The thicker phenolic reed necessitates use of a thick gasket so the hex bolt heads do not interfere with the ribs up by the ports. Fortunately I had a couple of those original thick gaskets.
My engine is going on the display shelf, Chris is gonna run his in the Clinton WB class. I expect it will be a pretty good runner even though ports are not all drilled and we are putting a small Tilly on it. The 6 cu-in helps out a lot.
Only one had a manifold and it had an untapped shroud tab on it unlike what is shown in the IPL. The reed plate had no reed guard at all. It was a phenolic reed with just a flat plate and lock tab. With the ribs in the Mc2 block, it didn't really need as guard or stop, the ribs do that. The thicker phenolic reed necessitates use of a thick gasket so the hex bolt heads do not interfere with the ribs up by the ports. Fortunately I had a couple of those original thick gaskets.
My engine is going on the display shelf, Chris is gonna run his in the Clinton WB class. I expect it will be a pretty good runner even though ports are not all drilled and we are putting a small Tilly on it. The 6 cu-in helps out a lot.