Throttle servos.

I asked this on a couple of other forums, but I value the input on here just as much, so here goes.

When it comes to a throttle servo on a petrol engine, what are the key things to go for? Is it a metal gearbox, or plastic gearbox? I'm wondering about using a metal geared mini servo that I have spare. It has plenty of power to shifting the throttle arm, and has a pretty good metal gearbox in it.

But, is the vibration going to wreak havoc on the smaller geartrain, or is it going to cause an accelerated wear due to the metal gearbox?

Thoughts?
Andy

I was advised by wise old hands that the mini and micro servos are not that great at handling vibration - or oil and fuel for that matter.
I think its fair to say that the modern mini servos were really developed to fit the criteria for leccy fliers, and with the price of a standard size decent tough servo, I think I would be buying /obtaining one of those. Just my 2P worth.

That is basically my concern Tim, whether the geartrain can handle the vibration. It has plenty of power to actuate the throttle arm on the carb, but whether the gears will crumble under the shaking they get from the dirty great lump of engine up front, is what I was wondering.

Andy

Andy if you're going to use the pull only method as we talked about at the weekend then far less vibration gets transmitted to the servo and the likes of a HS 225 MG Hitec (mini not micro) would be fine if you are however going for the solid link push pull setup then I'd be inclined to go for a standard size servo. I always try to find something with good resolution so that you always get the same reliable tickover