Subject: [FlyRotary] Re: Cooling Problem

 

Dave;

 

My thought is that some excessive clearance in the pump could result in small reduction in flow; but never allow full bypass of the flow.  When your engine is at 2000 RPM it should be pumping about 15 GPM.  No way that is going to bypass through the impeller clearance rather than go around the loop.

 

Al

 

Dale,

 

The impeller is very securely fastened to the shaft, but that is a thought about the impeller clearance.  The thought had crossed my mind but it is a very difficult thing to measure (kind of like trying to watch the light go out after the frige door is shut :-)   I figured since it was sold that way it must be approiate, but it is an aftermarket pump and housing so who knows.   Before I put it all together I will make some measurements and see if I can figure out the clearance...  maybe with a piece of clay on the impeller blades.

 

Does anyone have a guess as to the proper impeller clearance?

 

Dave Leonard

 

 

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