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Hallo apseed,

to answer your question older or newer type MB engine. What is differnet.

The first MB 40 pylon engines where extremer, more powerfull but no easy to handle, often to difficult for the pylon racers.. So some userfriendly modifications came up.

The outlet port shape is complete different. On the older type much extremer.
The inlet porting ist also different, sometimes you have to use JB welt to modified type 1 to retuned in the size and shape as the new type, to became better handling.

Please see the pictures and compare what you see. Outside and inside a lot of different things you will see.

On all pistons you see the latest rod. This is the best. In the beginning you had a lot of problems with the rodbreaking, now this problem is solved.

I still use the old type for speed with better results but you need a lot of know how for consitend behavier on the engine.

Regards Michael