Inverted ASP.61fs - RCCanada - Canada Radio Controlled Hobby Forum
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Old 03-30-2011, 05:08 PM   #1
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Inverted ASP.61fs

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Just wondering if anyone has ran a asp 61 four stroke inverted and if so how did it run.
thanks kev
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Old 03-30-2011, 10:12 PM   #2
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Re: Inverted ASP.61fs

Haven't run the ASP61fs but have run the ASP91fs inverted and it runs just fine. The key to these motors unlike OS fs motors is a good long break-in either upright or side mounted. A good 5 or 6 tanks and you are ready to go.
I have found that if you try to shorten this step you have nothing but problems.
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Old 03-30-2011, 11:32 PM   #3
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Re: Inverted ASP.61fs

mounting any motor inverted can have a few issues, but basically once fired up it does not know the difference.

First and foremost you must account for any change between the carb height and fuel tank centerline. If too high or low you can create mixture issues during running and/or even have fuel siphoning out the carb when sitting. I had this when I mounted the engine inverted on my Harvard II and ended up fabbing 3 firewalls till I got the fuel tank and engine height correct.

Second is also important, but comes when you want to start the motor after any extended sitting. ANY oil or fuel will now be pooled in the cylinder head and glow plug area, (remember the movies of the ground crew running the prop blades through by hand on the old bombers before sending them off on a mission?). Minor would be the difficulty in getting the glow plug hot enough when submerged. The critical concern is what is called "Hydraulic Lock" where the piston comes hard up against that incompressible oil and/or fuel mix as it moves towards the head. If you hit the motor with a starter you can actually damage the internals. That's why it is always a good idea on any motor to flip the motor over by hand (COLD with no glow heat applied). You can feel if the motor internals hit and also get a good feeling for the general condition of the motor, (ie, prop or spinner loose, bearings notchy or other internals feel like they are rubbing).
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