A buddy of mine put in a set of Modify drop in high torque gears. Afterwards his gun/gears were substancially louder - and sounds like crap in my opinion. Changing motors revealed varying results:
- Old TM motor with lots of pinion wear - quietest (proper sounding)
- Stock VFC motor with slight pinion wear - louder (doesn't sound good)
- Brand new G&P 160 motor - loudest (haven't heard it myself but I guess it sounds terrible).
My conclusion is that there is insufficient backlash in the hi-torgue gearset:
Backlash Description:
http://www.gearshub.com/gear-backlash.html - google for a better explanation
Basically the back of the teeth on the pinion gear hit the backside of the bevel gear teeth (in other words the 'backsides' of the teeth hit each other). Reason:
They are torque up gears, therefore you need more teeth on the bevel gear in the same amount of area to create the extra torque - therefore the teeth must be spaced closer together and insufficient backlash was the result. The backlash increased with pinion wear which is why the motors with more wear were quieter. Make sense?
So my questions are:
- Is this common with torque up gears (ie. are they noisier)?
- Is this common only with Modify gears (ie. are they noisier)?
I don't believe in using anything but regular ratio gears so I have no experience with hi-torque gear ratios. I'm pretty sure I'm correct in my diagnosis but I'd like to be certain as well as see if other hi-torque gear sets have this problem.