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MG Midget and Sprite Technical - Marina crank / flywheel / clutch

I'm going to be using a Marina crank in my big engine build.
I'm aware of the differences between the flywheel flange of the midget / Marina crank, and the need to machine the Midget flywheel to fit.
As I don't have a flywheel with the engine, would it be easier to get hold of a Marina item? If I do, will there be problems with using a normal Midget clutch? Will I need a Marina clutch and if so, will that work with the input shaft of my Midget ribcase 'box, and the Midget clutch actuation gear?

Or shall I just get a Midget flywheel and have it machined to fit?

I'm sure there's a simple answer...
Steve Clark

Yes, the simple answer is that the Marina flywheel is a larger diameter, so no good.

You need a Midget flywheel and machine it, or machine the crank.
Dave O'Neill 2

Brilliant - thank you Dave.
Steve Clark

Steve, what are you going to do about the rear engine plate? inorder to hook up the gearbox. and the oil seals in the rear engine plate?

I Just recently became aware of this modification when Nick was looking into it, just before his moment in time.

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Standard rear backplate Prop - change of crank / flywheel has no bearing ('scuse pun) on it.

Oil seals in backplate? From my (admittedly dodgy) memory, there aren't any.
Steve Clark

Yep simply machine the flywheel from a Midget. It only needs a knats!
Bob (Robert) Midget Turbo

Thats intresting, I was thinking the set-up was similar to a mini cooper where they dont have a scroll seal and a lump of steel for the flywheel to bolt onto and an "actual real rear engine oil seal" (say that 3 times) I hope it works out for you, looking forward to the pics.

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This thread was discussed on 24/11/2008

MG Midget and Sprite Technical index

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