Belt Deflection and Clutch Engagement RPM

[Drewd]

Didn't notice it until today that my primary was engaging at 4500 rpm. When sled was new, it engaged at 4200 rpm.

Could too much belt deflection be the cause of this? When I first got sled, the belt top sat higher than the top of the secondary and checking it today, the top of the belt was below the rim of the secondary. Pushing against the belt showed a lot of slack deflection.

I adjusted the deflection after I got home but wasn't able to test it out as it is already dark outside and most of the snow has melted in the street.

Thoughts?

Thanks,
Drew

PS I now carry a small set of allen wrenches so I can do this adjustment in the field.

 

[BILTIT]

Yes


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[robadoodle]

make sure you carry a 1/4" bolt with you because the brittle adjuster bolt snaps if you aint ready for it.
they make an adjuster for your primary that takes care of engagement point. i got mine from kurt's. works the way its supposed to. let me know if you have ?'s.

 

[winter4ever]

deflection wont really effect engagement rpm, more of what "gear" your sled is when it does engage. Engagement is all about weights verses your primary spring. If your spring is binding up or gouging the surface of the primary that it rides in, then you can have weird issues with engagement. That is where I would start if you think you have an issue, but it doesn't really sound like you do.

 

[Trenchmaster]

Another thing to check is the side clearance between the belt and primary sheave. As the belt wears this clearance will increase causing the motor to spin up more before the belt engages.