stunthanger.com
Engine basics => Engine set up tips => Topic started by: Gordon Tarbell on October 20, 2006, 05:41:26 PM
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I have found in my old stash of stuff some new in the box perry fuel pumps to fit the St 51-56-60 , Veco 61, and St 40-46. Since some folks like to run muffler pressure on the stunt engines, I thought I might give these a go. Any of you guys ever tried these pumps before, for a stunt application?
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OK, I guess I will be breaking new ground this winter trying this.
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People have tried them and complained about the weight. Also, the backplate style of Perry Pump has some sort of bleed hole in it that has to be postioned properly.
It's also a bunch more finicky parts to keep clean and wear out.
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I have found in my old stash of stuff some new in the box perry fuel pumps to fit the St 51-56-60 , Veco 61, and St 40-46. Since some folks like to run muffler pressure on the stunt engines, I thought I might give these a go. Any of you guys ever tried these pumps before, for a stunt application?
HI Gordon
I have used them on many differant 2 and 4 stroke engines, The results were not good.
They make the motors "dumb motors" Kill off the 4-2 break. . Plus they also have several other downsides.
You may possibly have luck with them on 4 strokes but in my opinion they are useless for our purposes.
Regards
Randy
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That is interesting because one of the perennial debates f~ is whether the 4-2 break is caused by the engine going lean because its nose is up and the tank head is now lower, or the increased load on the engine because the rpm drops because of the larger load going vertical (engine heat goes up). Your observations (assuming they were in-flight) supports the first view.
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Thanks for the input guys. I think I might still try it ,but not with great expectations of a stellar stunt run.