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        Help! How do I retime my 6327 Graupner Speed 480 race motor for a gearbox.

#1 Joe Elston Apr 19, 2001 07:13 PM

Help! How do I retime my 6327 Graupner Speed 480 race motor for a gearbox.
 
The last time I tried this, I ruined my 40:00 dollar motor. I need to retime my speed 480 to run in reverse for a gearbox. I have a four cell pack and also have an Astr Super what meter. I would appreciate anyones help please. I dont want to ruin another motor. And this one is brand new never been run.
Thanks Joe

#2 LJH Apr 19, 2001 08:51 PM

Check this out.
http://www.maxxprod.com/cobaltmotors.pdf

Cheers,
Jim

#3 El Pe Apr 19, 2001 08:56 PM

Joe,
What gear box are you using with your 480?

Lee

#4 Joe Elston Apr 19, 2001 09:25 PM

EL PE, well I will be using two gearboxes on my 480's. I have a twin Islander that I am installing two speed 480's in. What I did was buy the Cermark/MPI speed 400 box they are identical near as I could see. I then took my dremel tool and made the opening larger for the 480 to fit in the gearbox. I then purchased rc car metric pinions to match the ones that came with the box for the smaller speed 400 shaft. RC car motors have 1/8 inch shafts like the 480. Well I have now a gearbox with dual ball bearings and with ratios from 2.0 to 1, 2.5 to 1 and finnaly 3.0 to 1. And you can even go higher by just taking some more metal of the gearbox. So you can slide the motor down to use a bigger pinion. I have not done very much testing because the first motor I tried to reverse timed I cooked. And I am installing a planatery box of 3.7 to1 on a 480 for my Herr Piper Cherokee. It does not need reverse timing and I wanted to make sure the motor fit in the Cherokee's cowl I am also going to put both planes on floats,
That is how I did.
Joe

#5 Joe Elston Apr 19, 2001 09:28 PM

LJH thats not what I was looking for. You can reverse the motor without changing the leads. Thanks Though. Someone will help me out.
Joe

#6 LJH Apr 20, 2001 11:50 AM

Joe,
You can do it one of two ways. either what is said on the MPI page or turn the end bells 180 deg's. But you will still have to retime. This is how I have done it on my SP48 BB race motor for my Pico Jet. Good luck.

Cheers,
Jim Hahn

#7 Joe Elston Apr 20, 2001 11:56 AM

Jim, can you tell me how you did it? and which process did you use. I would really appreciate the info.
Joe


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