That's the way to do it!
06-09-2005, 04:38 AM
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That's the way to do it!
Whooooooo. Blown my first gear set!
So the moral of this story? If you are using the stock plastic gears DONT use a gear cover. It obviously makes the gears overheat, mind you I was doing some really long WOT runs up and down a beach[>:]
Ian F.
So the moral of this story? If you are using the stock plastic gears DONT use a gear cover. It obviously makes the gears overheat, mind you I was doing some really long WOT runs up and down a beach[>:]
Ian F.
06-09-2005, 04:46 AM
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RE: That's the way to do it!
If you continue to drive in those conditions you may find that you will still overheat and strip those plastic gears[
]
Too each his own weak point
It looks like you had fun if only for a moment in time and that is what matters[&:]
]Too each his own weak point
It looks like you had fun if only for a moment in time and that is what matters[&:]
06-09-2005, 04:47 AM
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RE: That's the way to do it!
Oh dear.
I have just ordered a metal pinion gear (the small one) and a alloy gear carrier. The pinion came this morning from KRB and i am just waiting on the alloy gear carrier.
At the club i go to NVR, one of the members has seen both the plastic pinion and spur met together
Darren
I have just ordered a metal pinion gear (the small one) and a alloy gear carrier. The pinion came this morning from KRB and i am just waiting on the alloy gear carrier.
At the club i go to NVR, one of the members has seen both the plastic pinion and spur met together
Darren
06-09-2005, 07:27 AM
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RE: That's the way to do it!
Funny thing is I had a marder race (26cc) before this for 2 years and it still had the original gears on when I sold it. OK they were a little worn & chipped, but I never stripped or melted one, & I drove that car as hard or even harder than the MB. Although I never fitted a gear cover to the Marder.
06-09-2005, 07:43 AM
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RE: That's the way to do it!
with the big tires the forces are quite a bit bigger there. normal buggies suffer much less from this type of problem. steel pinion and alloy gear carrier is the thing to do. even then you will strip some spur gears from time to time.
rhylsadar
rhylsadar
06-09-2005, 08:01 AM
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RE: That's the way to do it!
Cyberfyn, did you run your Marder on the sand like your monster beetle, I found that sand gets between the spur gear and the spur gear carrier and locks them both together solid which then negates the rubber bushings. I did not strip gears but I distroyed 2 plastic spur gear carriers.
What I did with the alloy spur carrier was to take a skim off the outside diameter with a lathe so the gap between the alloy carrier and the plastic spur gear is just larger than a grain of sand and can't lock solid. Since I did this I have had no problems
I am also running a steel pinion, my ratio is 18/46 and up until recently my cover was on.
Another thing to consider as to the cause of your problem.
What I did with the alloy spur carrier was to take a skim off the outside diameter with a lathe so the gap between the alloy carrier and the plastic spur gear is just larger than a grain of sand and can't lock solid. Since I did this I have had no problems
I am also running a steel pinion, my ratio is 18/46 and up until recently my cover was on.
Another thing to consider as to the cause of your problem.
06-09-2005, 08:03 AM
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RE: That's the way to do it!
Yes. I ran them both in the sand, but only on hard wet sand (low tide) I try and keep out of the dry stuff 
Ian F.
Ian F.
06-09-2005, 08:08 AM
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RE: That's the way to do it!
I found that when I striped the inner flats on my plastic spur gear carrier it was a real ordeal to remove the spur gear from the carrier. Have you found this too?
06-09-2005, 05:15 PM
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RE: That's the way to do it!
Here's a few pics of my MT fitted with a alloy gear carrier and steel spur gear - accompanied by a sheared pinion gear which is soon to be replaced with a steel one I think.
06-09-2005, 05:36 PM
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RE: That's the way to do it!
My gear set looked exactly like that cyberfn, this is with a open gearwheel. It still overheated, or perhaps a stone got caught. Can't be sure. IMO even with my gear cover I'll still use plastic gearing.
X-Fell I would re-consider not using all metal for the gear parts. What happens if a stone gets caught in the teeth? At least the plastic gear is destroyed and not anything else (and costly)
X-Fell I would re-consider not using all metal for the gear parts. What happens if a stone gets caught in the teeth? At least the plastic gear is destroyed and not anything else (and costly)
06-10-2005, 03:33 AM
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RE: That's the way to do it!
Exactly. I'd rather blow a $6 pinion than a diff or engine!. I have re-ordered plastic gears and a can of spray silcone dry lube. This will kill the friction between the plastic gears, stoping the heat build-up but won't pick up dirt.
Ian F.
Ian F.
06-10-2005, 03:45 AM
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RE: That's the way to do it!
This is the stuff I use on my gears with good results. Mine are all steel/alloy though. I try to destroy my beast and have yet to have a faiure in my motor or diff. related to upgrading to all metal gears[sm=surprised.gif] Unless you count my drive cups as part of the diff.[&:]
06-10-2005, 05:34 AM
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RE: That's the way to do it!
2 years old? Then that explains a lot. Most likely FG used a Superior grade of plastic back then and has only recently switch to an Inferior grade. Just like their switching from Solo and FG engines to the made in China brand. Lower cost = Higher Profit. Or an even easier example. Harley Davidson motorcycles were always American made with American made parts and sold good and were High priced. After HDM switched to cheaper made in China parts, the parts were inferior and started breaking. With the cheaper made parts their prices stayed the same but their profits increased knowing that motorcyclist had to replace the cheap made parts that were breaking with other cheap made parts. Things went great for a while. That was until the motorcycle riders started to switch to other makes and HDM's profits started to plummet almost to the point of full bankruptcy. They learned their lesson mighty fast and went back to a Superior grade parts made in the USA. Now the sales are brisk again with lots of repeat buyers. FG should learn a lesson from HDM.
The above example can be found in most every country or industry when they switch to a POOR QUALITY and CHEAPER PRICED item just to increase their profits at the expense of customer satisfaction and at times safety.
The above example can be found in most every country or industry when they switch to a POOR QUALITY and CHEAPER PRICED item just to increase their profits at the expense of customer satisfaction and at times safety.
06-10-2005, 02:44 PM
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RE: That's the way to do it!
ORIGINAL: Cyberfyn
Exactly. I'd rather blow a $6 pinion than a diff or engine!. I have re-ordered plastic gears and a can of spray silcone dry lube. This will kill the friction between the plastic gears, stoping the heat build-up but won't pick up dirt.
Ian F.
Exactly. I'd rather blow a $6 pinion than a diff or engine!. I have re-ordered plastic gears and a can of spray silcone dry lube. This will kill the friction between the plastic gears, stoping the heat build-up but won't pick up dirt.
Ian F.
06-11-2005, 05:35 AM
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RE: That's the way to do it!
I don't think so. The flats on the pinion were not melted at all & I was doing verrrrrry long full throttle runs up and down a beach so the cluch was not constantly being used. In fact the cluch probable just engaged the once as I pulled off so it would have produced no heat on it's own, and I spend the next 5 mins blasting round in huge ovals and figure eights
So I still think it was a combination of full power, dry gears, and sand causing the gears to terminally get together in the ultimate mesh!
Ian F.
So I still think it was a combination of full power, dry gears, and sand causing the gears to terminally get together in the ultimate mesh!
Ian F.
