MVVS 2.5

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  • #41332
    Scott Lapraik

    Good morning engine experts. I have just acquired a new MVVS 2.5 and from what I’ve read on there web site this should make for a good A/B classic engine on a 450 sq. in. plane, i.e. Satellite, Midi Pearl, etc. Does anyone have any first hand experience with these engines?

    Thks, Scott


    Hi Scott,
    I will assume that it is the newer ‘split case’ MVVS, rather than the older D7 model.
    This would come under the ‘fairly powerful’, descriptor I think, rather than being a true Nelson competitor. They are a trifle heavy, but it should give what you want, especially if you use a little nitro. A Nelson plug head would probably help, too. If it is the ‘split case’ engine it can be assembled with a side or rear exhaust, but rear exhaust makes everything inside line up better. This is from memory only – I haven’t seen one for about 15 years – but what I’ve just said implies there’s a spare transfer cavity in the lower case, doesn’t it? In which case finding a way to block that up would be of possible benefit.

    The older D7 came as a glow, too, but was better known as a diesel, and was really very good for it’s time (late 60’s/early 70’s). It really only lost out when F1C went to a 7 sec run and the all-conquering Rossi 15 reigned supreme. The Czechs did very well with them in a number of World Champs.

    I’ve rambled enough!


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