Poorboy conversion pulley vibration

1332 Views 10 Replies 7 Participants Last post by tire joe, Jul 5, 2013

Jdolinski

Discussion Starter · Mar 17, 2013

I got the poorboy conversion all installed (took me a lot longer then I expected). Started it up charge was great!

However I didn't put the cover over the alternator so I could see the belt, and it seemed to be a bit of vibration in the belt. When I increased RPM's the pulley seemed to smooth out. It didn't cause any vibration it just seemed like the belt was a bit sloppy. The belt is tight so that isn't the issue. Has anyone else experienced this?

The pulley is tight with one spacer behind it.

Any help would be appreciated, my concern is that if it is out of what that it will throw my camshaft off and cause bigger issues.

Thanks for any help.

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1 - 11 of 11 Posts

tricky

· #2 · Mar 18, 2013

Normally this kind of belt has a tensioner which would smooth out the oscillations in the belt.
Unfortunately we dont have room for such. I really wouldn't concern yourself about it too much, I have about 3/8 -1/2" slop in the belt on my bikes and I have never seen one that doesnt have......some slop

It shouldnt have any control over the camshaft..... the drive belt should be on the main shaft..... I hope

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Jdolinski

Discussion Starter · #3 · Mar 18, 2013

Trickey,

I meant main shaft, I was hoping that there wasn't something out of balance... Hardly possibly but feasible. Just a little rub on the fan belt because of they slop so I have to extend add a another spacer behind the radiator, but better then taking the whole assembly apart again.

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neoracer

· #4 · Mar 18, 2013

a little "slop" is acceptable,and desirable actually,if you tightened it up so there was none all the time you would most likely have more chances of hurting the bearings in the altrenator

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Ansimp

· #5 · Mar 18, 2013

neoracer said:
a little "slop" is acceptable,and desirable actually,if you tightened it up so there was none all the time you would most likely have more chances of hurting the bearings in the altrenator

And the crankshaft bearings, is there any way that your poor boy crank pulley is slightly off center as this will cause the belt to flap?

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tricky

· #6 · Mar 18, 2013

Ride and enjoy the extra lighting power

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BenMilner

· #7 · Mar 18, 2013

It's normal to have some slop in a fan belt with no tensioner fitted. Take a look inside any pillar drill or belt driven compressor and you will see what I mean. Like the other members said, just ride and enjoy the added charging benefits.

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Jdolinski

Discussion Starter · #8 · Mar 18, 2013

Ansimp said:
And the crankshaft bearings, is there any way that your poor boy crank pulley is slightly off center as this will cause the belt to flap?

I guess this is my question. Since the bolt fits snugly around the pulley and they were both supplied by Don is there a way to have the pulley be off center?

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tortue704

· #9 · Jul 4, 2013

hello im a new menber
i want instal a the convertion kit how ken i instal the pulle they affec my timing you thinks or i ned a mecanic for doo the job

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tricky

· #10 · Jul 5, 2013

Your question on the timing has been answered in another section of the forum.

But it will not affect the timing.

If you are comfortable working mechanically you should be able to do the job.

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tire joe

· #11 · Jul 5, 2013

If the idle speed is too slow,it can cause belt oscillations. The idle speed should be 950 to 1000 rpm.

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