Hello... the Paul Landels (Just Engines) well-traveled shoe box has arrived again.! The contents are an M.V.V.S 40 and 49 with quiet silencer and Davis Diesel Conversions. M.V.V.S. have been producing quality engines since the early fifties. Both these motors can be converted to side or rear exhaust by simply removing the head and liner cylinder assembly and re-locating them to their respective new positions. Not advisable to do with a used motor however.

M.V.V.S 40 DIESEL CONVERSION
The 40 supplied was used and abused but fitted with a new piston and cylinder liner, plus a Davis head and instructions. Easy job to convert. Undo four cap head screws and remove glow head. Gently remove alloy gasket and put on diesel head, or fit new gasket. Ensure liner has not moved out of position. Fit conversion and screws and tighten down evenly.

M.V.V.S DIESEL 40 ON THE TEST BENCH
Firmly clamped on the bench, throttle linkage attached, fresh fuel in tank, 11x6 A.P.C. prop. 21/2 turns open on needle, ready to go. Open throttle fully, finger over choke, turn prop to draw fuel into motor. Remember, diesels are always live, so careful when choking because they may fire or start. Reduce throttle to 1/4 open, insert Allen key into compression screw, flick prop and increase compression until motor fires or starts, when running open throttle to full and adjust mixture and compression until motor is happiest. This one took six flicks and settled down very quickly with no signs of distress. Shut throttle and adjust slow running mixture and throttle idle. Also, again, very easy and quickly done. Throttle response appeared very good. After about 20 minutes of running in, five-minute bursts and allow to cool in between, the motor was ready to test. All starts took no more than three flicks. A range of A.P.C. and radio – active RAM props were tried, the best results Rpm were on RAMS.

M.V.V.S 49 DIESEL CONVERSION
This was a brand new out of the box engine. The motor was fitted with a 12x6 APC prop for running in, the conversion and setting up are the same as on the 40. The motor is only slightly taller and the cosmetics differ slightly. It will go straight into where a 40 came out of. With no modifications – handy, eh! The same running in period and methods were used and the motor was very happy after this time.

SUMMARY
The 40 was air tested in a Weston Jazz 3D and was found to have more than adequate power. The vertical performance was fantastic, 15 feet from ground on tick over, full up open throttle, instant response with 10x6 R.A.M. Out of sight. The 49 was exchanged on the field and fitted with an 11x7 R.A.M., slightly deeper exhaust note, same excellent performance – too much for the pilot "me". Well, was I impressed?
YES...... I bought them both!