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MVVS 21 Diesel Review
By Dave Ridgway
Paul Landels, of Just Engines, supplied an MVVS 3.5 (21) Standard R/C glow plug engine along with a Davis Diesel head for evaluation.
The instruction sheet supplied with the Davis head advises fully running in the engine as a glow before converting it to diesel operation. This gave me an opportunity to get some performance figures. As expected, the engine performed extremely well, running very smoothly and starting by hand was usually first time-hot or cold. After an hour or so running in, the MVVS felt nice and free with a perfect compression seal from the ABC piston/liner assembly. The conversion to diesel takes but a few minutes to change the head over. The standard head gasket is carefully removed from the original head and transferred to the diesel head. The glow needle settings are retained as a starting point for diesel operation load stays similar the compression screw can be left alone once set, the engine warming up after about a minute to full speed. This is by far the best throttling diesel I have witnessed. The special seals used for the contra-piston obviously work well, as does the compression adjustment work smoothly – none of the sticking contra – pistons encountered on many conventional diesel set ups.
The Davis conversion of the excellent MVVS works very well indeed, it could be used by the most inept "Diesel Dummy!" Starting is easy the engine being very docile with no tendency to bite at all. If you fancy throwing away all the paraphernalia associated with glow motors and going flying with just a can of fuel, or are simply just a diesel nut, try one of these excellent conversions.
For comparison only