Wednesday, November 30, 2011

Dave's MC18/MC21 engine

Nothing to do with my build, but, Dave ended up in a situation where he had an MC18 engine without a crankshaft. Then he got hold of a good MC21 crankshaft and MC21 cases.
So he put together an engine that was MC21 crankshaft and crankcases, but with a MC18 Barrels/heads and gearbox.
He bought an MC21 Selector drum and gear position sensor. Also bought an MC21 oil pump.
He has a (MC18) PGM II, so it is now just a matter of getting the neutral light to work off the MC21 GPS, with the MC18 PGM II (instead of the MC21 PGM III). This is very simple as there is a wire for the neutral light

MC21 drum has slot for Gear Position Sensor

Red circle is MC18 neutral switch trigger.
Purple circle is MC21 GPS slot.
MC21 drum has slot for Gear Position Sensor, and no taper in hole,
Otherwise it is the same as MC18.

MC18 and MC21 selector drums look the same from here

MC21 Gear position sensor with small roll pin for selector drum slot.

MC18 Neutral switch case. Offset from selector drum axis

MC21 Gear position sensor case. Coaxial with selector drum.

MC18 oil pump case

MC21 oil pump case with extra oil feed to RH main bearing.

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