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LeMans 3 vin question

dakota

dakota

Just got it firing!
Joined
Mar 27, 2009
Messages
7
Would it be possible to fit a round cylinder from an LM 1or2 to LeMans 3 cases that had the newer square cylinders?.All LM3's had a VF prefix I understand but square cylinders.I have a VF prefix engine with round cylinders....anybody?....
 
I don't know....................were the bore sizes not different? Given the love of round heads over square I would GUESS that if it could be done easily it would have been done many many times, so my money is on a No or at best a Yes but with a crap load of machining and mods.

The reason I posted was not to just waste your time with dumbass guessing, but I wondered if you knew about the possibility of putting round rocker covers on square heads? MG sell the converter and although not perfect and to the loathing of the purists, I think it gives an Ok look.

Just a thought

John
 
Considering that MG persisted with a sump spacer for nearly 30 years before making a one piece unit would indicate to me round fin would quite possibly fit the square fin cases. But hey, I was wrong once in 1974.
 
Hello there..

By the way, the only time I had one carb on the LeMans completely misbehave and foul a cylinder was when I didn't tighten the atomizer sufficiently and it fell into the bowl, main jet and all. Lots a gas into the cylinder. I've always wanted to get Convert cylinders with pistons and put them on my LeMans, retaining the stock big valve heads. I believe it is the only other iron sleeve bike of the round jug years and a 1000cc.

Regards,
Anthony
 
Key element would be the alignment of the oil drain hole back into the block. I'd compare cylinder base gaskets for the two types of cylinders. If the holes match, or they are the same part number, then you have a good chance of converting a square head to a round head. Just remember you will need a different oil feed line to the head, and the carb mount sizes are different between the round and square heads.
 
The part numbers for the head bolts are the same for both. The head are base gaskets are different PNs for at least one reason, and that is the square fin has to return oil galleries and the round just one. The other alignment issue is the bolt spacing. If the oil gallery in the block is a little off you can increase the hole size a bit as long as it doesn't get closer to the sleeve hole. The clearance between sleeve and the block would have to work too. I found a parts place that sell M8 to M6 studs for the manifolds, so manifolds can be reused. Push rods are the same PN too, so that's good.

Please post if you try swapping the jugs.
 
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