GEM930

GEM930

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I posted to an older thread about this, but realized it was the rv-10 section only. I'm reposting here in hopes that I might get a larger audience. I looking for an underdrive pulley the standard Lester part # 14684 alternator. Any ideas where to find one or suggestions on size???

Thanks guys! (and gals)!
 
GEM930 said:
I posted to an older thread about this, but realized it was the rv-10 section only. I'm reposting here in hopes that I might get a larger audience. I looking for an underdrive pulley the standard Lester part # 14684 alternator. Any ideas where to find one or suggestions on size???

Thanks guys! (and gals)!
Click to expand...

Are you looking for a larger pulley for the alternator?
 
Yes, Appearently the standard pully the Lester comes with drives the alternator much faster than need be when used with the large lycoming flywheel.
 
Installing a larger pulley will likely require a new belt and may also cause interference with the cowl (I know clearance on the 7 is very close between cowl and pulley).
 
Pulley

I have a 3" (might be 3 1/4") 15 mm shaft pulley. It is at home, so can't measure it. Let me know if you are interested.
 
If its 3.25 I might be, let me know. Also please measure the width of the flat area at the bottom of the "v".
Thx!
 
I installed a stainless steel pad on the cowl

I have the later RV-6A cowl and the standard pulley clears it when it is just sitting in the hangar but I noticesd markings where there had been pulley to cowl contact and knew it was only a matter of time before the cowl was penetrated. I cut off the blade of a SS butter knife and glued it to the inside of the cowl with structural adhesive over the contact marks. Now several years later there is a grove worn in the SS. My neighbor has a slot cut completely through his RV-6A cowl by the alternator pulley. Compared to the airplane, alternators are a throw away part and I would not try to save it at the risk of damaging the cowl.

Bob Axsom
 
Bob Axsom said:
I have the later RV-6A cowl and the standard pulley clears it when it is just sitting in the hangar but I noticesd markings where there had been pulley to cowl contact and knew it was only a matter of time before the cowl was penetrated. I cut off the blade of a SS butter knife and glued it to the inside of the cowl with structural adhesive over the contact marks. Now several years later there is a grove worn in the SS. My neighbor has a slot cut completely through his RV-6A cowl by the alternator pulley. Compared to the airplane, alternators are a throw away part and I would not try to save it at the risk of damaging the cowl.

Bob Axsom
Click to expand...

I've seen many a cowl with a little "bump" for the alternator pulley - in fact, I've installed a couple of those bumps. Very simple fiberglass work, and you just put it where the groove tells you to....;)
 
Hidden bump!

Ironflight said:
I've seen many a cowl with a little "bump" for the alternator pulley - in fact, I've installed a couple of those bumps. Very simple fiberglass work, and you just put it where the groove tells you to....;)
Click to expand...

And very few people even notice the bump! :) A tennis ball with wax paper makes a great bump shaper, pressed into the soft fiberglass from inside of the cowling.
 
GEM930 said:
If its 3.25 I might be, let me know. Also please measure the width of the flat area at the bottom of the "v".
Thx!
Click to expand...

It's 3 1/4 diameter, 15mm shaft, the bottom of the v measures 5 mm.
It's new, bought it for mine, but couldn't use it for clearance reasons.
 
Different strokes ...

Add bumps to the outside surface - REALLY? I guess if you're going with a larger diameter pulley that is the only serious option.

Bob Axsom
 
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Pulley Blister

Bob- It would be my guess that a small, properly done "blister" on the cowl would not add enough drag to the airframe to be measurable.
 
Don Jones said:
It's 3 1/4 diameter, 15mm shaft, the bottom of the v measures 5 mm.
It's new, bought it for mine, but couldn't use it for clearance reasons.
Click to expand...

I believe it's smaller then the bottom "v" of my fly wheel. Would that make a difference ??? I think I would on getting the proper belt (width). I think my flywheel is 8-10mm, I'll check.
 
GEM930 said:
I believe it's smaller then the bottom "v" of my fly wheel. Would that make a difference ??? I think I would on getting the proper belt (width). I think my flywheel is 8-10mm, I'll check.
Click to expand...

The width of the flat at the bottom of a "V" pulley is irrelevant as long as the sides of the "V" contact the sides of the belt.

The belt should never touch the bottom of the "V"
 
GEM930 said:
I believe it's smaller then the bottom "v" of my fly wheel. Would that make a difference ??? I think I would on getting the proper belt (width). I think my flywheel is 8-10mm, I'll check.
Click to expand...

This pulley is for a 10 mm belt.

You can have the pulley, just pay shipping.
call me at five seven five six three five six one nine one
 
So there no differences in belt widths??? When I initially started look for a pully at an alternator shop. The first thing he did is measure the width. Now I'm confused!
 
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