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Home > Technical Chat > > Megajolt Trigger Wheel Fitting And Scatter, when used with the harmonic damper

adcyork

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York

7th Aug, 2009 at 01:00:59am

I've bought a megajolt set up second hand and it has come with a trigger wheel that is identical to this one: http://trigger-wheels.com/store/contents/media/65ring.jpg

Now i am considering my options as to how to mount it to my bottom pulley.

I'm running the standard harmonic damper type bottom pulley

My initial idea was to turn the pulley down down to produce a shoulder for the trigger wheel to be mounted against then attach it with 4 small mig welds.

My only concerns are that:

a) the pulley mass supported by the rubber damper will be higher than it was designed to be, due to the trigger wheel now being mounted on it, which will move its effective damping range further down the rev range (out of usable range).

b) The welding would possibly melt or damage the rubber damper due to the conducted heat?

I'd also heard that becuase the section of pulley that the rubber supports is always moving during use it would cause the trigger wheel to move and cause scatter of upto 2 degrees. Can anyone shed some light on this?

Any help would be great

Thanks


philc

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bromsgrove

8th Aug, 2009 at 07:31:29am

do a search to see what others have done there are loads on here

Rob H

4314 Posts
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Formerly British Open Classic

The West Country

8th Aug, 2009 at 09:45:29am

On 7th Aug, 2009 adcyork said:
I'd also heard that becuase the section of pulley that the rubber supports is always moving during use it would cause the trigger wheel to move and cause scatter of upto 2 degrees. Can anyone shed some light on this?


There is some movement as you say but it's considerably less than 2 degrees. Given the size of the pulley and the thinness off the rubber you can do some pretty quick hand waving maths which give you about 1/2 a degree of scatter before the rubber reaches it's limit. As MJ is only accurate to a degree, it doesn't really matter. If you don't trust my fag packet maths you may be relieved to know that many people myself included are successfully running MJ's using a trigger wheel cut into the outside of the damper.

Isambard Kingdom Brunel said:
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Home > Technical Chat > > Megajolt Trigger Wheel Fitting And Scatter, when used with the harmonic damper
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