GM LE2 engine conversion

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Chris Matheny

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Got the mold gel coated for making the carbon fiber valve cover. I will now sand and buff this and take a plug from it to then lay up the carbon valve cover on. I shaved 2" of height at the highest point and 1.5" off what will be the front of the engine. These dimensions along with my gearbox will keep the propeller centerline the same as a Lycoming 235-320 and also the height of the engine. I haven't progressed as much as I wanted lately but I had a cervical fusion in my neck yesterday so when I start feeling better progress should pick back up.
 

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Vigilant1

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Chris,
Thanks for the update. I'm surprised GM left the valve covers so much higher than absolutely required, getting the hoodline as low as possible is an important consideration in some installations. Putiing prop at the same height as an O-320 will be a real plus.
Take care of that neck. We only get one chance to do that post-op care right. It's >possible< the medical community will be a bit busy for awhile, so try to stay out of their clutches.
Best wishes.
Mark
 

Chris Matheny

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Mark, they used that space for baffling for the PCV system. It was very well baffled since these engines are direct injected from the factory and have to keep oil off the intake valves. I'll be using port injectors and a different PCV system.
 

Chris Matheny

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Been playing with the throttle body and injectors idea, I think I'm going to make this a single injector per ECM setup at this point. Port injection smooths out low rpm idle and idle emissions but does very little for power and usually kills a little torque. I mocked up an intake today and will probably finish it this coming week. This will also shed a little more weight and simplify plumbing.
 

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Chris Matheny

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Made the prototype dual thermostat housing today. Still think I can shed some weight but hate to with the two bolt attachment and housing flex. It's very stable and would have at least triple redundancy with this design. This has a 180 a 195 and a bypass circuit. You'd know if any of them stuck and could plan accordingly. Cut almost 2" off the installed length. Will determine the fittings and sensors where I need them in the housings and machine them into place this week. I do not want any slip on hoses or hose clamps on this conversion. All The fittings will be AN fittings with safety wires. The thermostats you see will be replaced as they have been ground in areas I will not need. This did add about 14oz but I think it's worth it.
 

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