GAS Engine's, Basic Info

[LohringMiller]

I can't believe you are running your engines at close to full throttle. We could only get a few seconds of full throttle operation in my cat before the engines seized. At one time I believe we bought all the available AAC piston and sleeve assemblies. We tested more than 6 using different oils and break in techniques. Nothing worked.

Lohring Miller

 

[Rod Fonda]

I can't believe you are running your engines at close to full throttle. We could only get a few seconds of full throttle operation in my cat before the engines seized. At one time I believe we bought all the available AAC piston and sleeve assemblies. We tested more than 6 using different oils and break in techniques. Nothing worked.

Lohring Miller

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The heat gasoline produces,over expanding the piston and becoming oval shaped towards the hotter ex port side,,I'm wondering how much a ringed piston changes shape around the crown area and they can seize around the skirt area with a cpl thou clearance ,,So it could possibly work if it was run on methanol,with maybe some cooling holes under the ex port ?

 

[justaddwata]

interesting. They are ringed pistons without the ring's installed? Or regular pistons with no groove for a ring?

Sorry for the confusion - They were the original "no ring" version that were run first. The ringed versions have since been fitted.

 

[LohringMiller]

We seized a ringed piston as well. The cylinder was out of round just above the exhaust port giving no clearance in that area. Our other ringed pistons ran fine.

Lohring Miller