clutch bell differences from 22 to 17 tooth

[minmax89]

Good ol' Chickenman advized me to get a 17/36 clutch/spur set up. So I did.

I have a standard 22t clutch bell on my Picco (originally from my T-Maxx). I got the 17t hardened steel clutch bell from traxxas. They have a number of slight differences:

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Sorry the second pic is a bit blurry.
I now know I have to get different bearings for it so that's ok.
First difference is the height (depth) of the bell part. I noticed this because when I went to fit it, I couldn't get the c-clip in the groove as it sits out further. The internal diameter is bigger on the new one too but I'm not sure thats an issue. Is it?
I got a micrometer on it and here's the measurements:

22t
8.95mm bell depth
24.04mm int. dia of bell

17t
10.03mm bell depth
26.25mm int. dia of bell

What can I do? Get it machined?

 

[Snook Man]

1st, you will never get a hardened clutch bell machined unless at a machine shop for more $ than a new bell would cost.
2nd, the Revo and Tmaxx use a different pitch clutch bell and spur, Tmaxx uses 32 pitch aka mod .8
The Revo uses a mod 1 pitch bell and spur and neither pitch can be used with the other.
The 17T bell you purchased looks to be a mod 1 and should fit the revo spurs.
The bigger? is, what flywheel and clutch are you using? 2 shoes, 3 shoes, 10th scale? 1/8th scale?
If the bell fits over the clutch shoes completely you can just use a 3mm screw in the end of the crank and shim between the screw head and outer clutch bell bearing. Or, if the flywheel is shimmed you can remove a shim or 2 to gain room for the e-clip and/or use a shorter clutch nut to gain even more room.
If using a standard 1/8th scale clutch setup, the traxxas bells will be to small to fit the shoes.

 

[minmax89]

1st, you will never get a hardened clutch bell machined unless at a machine shop for more $ than a new bell would cost.
2nd, the Revo and Tmaxx use a different pitch clutch bell and spur, Tmaxx uses 32 pitch aka mod .8
The Revo uses a mod 1 pitch bell and spur and neither pitch can be used with the other.
The 17T bell you purchased looks to be a mod 1 and should fit the revo spurs.
The bigger? is, what flywheel and clutch are you using? 2 shoes, 3 shoes, 10th scale? 1/8th scale?
If the bell fits over the clutch shoes completely you can just use a 3mm screw in the end of the crank and shim between the screw head and outer clutch bell bearing. Or, if the flywheel is shimmed you can remove a shim or 2 to gain room for the e-clip and/or use a shorter clutch nut to gain even more room.
If using a standard 1/8th scale clutch setup, the traxxas bells will be to small to fit the shoes.

Thanks Man!
I have a 2 shoe flywheel from the T-Maxx. It's 1/10th. This is currently sitting on my picco .26 max red dot.

I also bought a 36t spur here.
And the clutch bell is here.
They are the two parts I got. They go together right?

 

[chickenman242]

they will go together but to get a 1/10 or trx clutch to fit on a bb engine you need to shim the flywheel ,its doable but from experience to 1/10 clutch doesn't seem to like the power of a bb and throws the shoes after about a litre of fuel . I think you said you had a 3 shoe setup?? that may last a bit longer but I would budget for a hpi savage clutch set ,you can get them on ebay for around $17 shipped and that usually comes with a 17t bell ,which you will need to change because as @snookman explained the bell sizes are different due to the scale sizes is that make sense.
http://www.ebay.com/itm/Savage-X-4-...es-17t-1m-86271-A992-HPI-109083-/390937835469
heres a link to the clutch I have used on a few builds works like a treat!

I think I just had a major brain fart , you are putting the picco in the revo ?? if that's the case that trx 17t bell will work 100% I would however still upgrade the clutch if funds permit, strc makes a real nice 3 shoe setup for around $25 I have run it on many of my rigs and it holds up to mid block power great.

 

[Snook Man]

The spur and bell in the above links, do not fit together (different pitches).

 

[chickenman242]

Haha snook man is right I misread the cb the spur is correct the bell you need is 5217

 

[minmax89]

Thanks a million lads.

So, my current options are
1. Get the 5217 bell + bearings and use the 2-shoe clutch I have.
2. Get a 3 shoe clutch kit from another make that a:has a 17t bell, b: fits the Picco and c: mates with the 36t spur I have.

Seems I should go option 2? Is that kit you linked suitable CM?

 

[chickenman242]

to be honest I've never run a bb clutch on a mid block engine I would assume that it would work with all the relevant bell and stuff.
both my mid blocks run a sb 3 shoe setup from m2c with a 17t trx bell and have lasted a few gallons so far without a drama.
maybe someone else can confirm the bb clutch setup if not I would get the 5217 bell with the strc 3 shoe ,to me its just as good as the m2c but has less tuning options in regards to springs.

 

[minmax89]

B

to be honest I've never run a bb clutch on a mid block engine I would assume that it would work with all the relevant bell and stuff.
both my mid blocks run a sb 3 shoe setup from m2c with a 17t trx bell and have lasted a few gallons so far without a drama.
maybe someone else can confirm the bb clutch setup if not I would get the 5217 bell with the strc 3 shoe ,to me its just as good as the m2c but has less tuning options in regards to springs.

Brill. M2c??

 

[Nitro4910]

Brill. M2c??

M2c Racing!
http://www.amain.com/M2C-Racing-Tra...roduct-Feeds&gclid=CK-j6suDgMECFYMF7Aod1DoA-A

 

[minmax89]

M2c Racing!
http://www.amain.com/M2C-Racing-Tra...roduct-Feeds&gclid=CK-j6suDgMECFYMF7Aod1DoA-A

Thanks. Yeah that looks the business.
However, I was thinking of adding the traxxas telemetry. for the speed/revs sensor I need a flywheel with a magnet in it I think? Is there anything out there that might be suitable.

Justs checked and I have the Revo 36t Spur on this truck.

I've now (trial) fitted the ofna mount and picco to the truck. You guys are right, there aint a lot of adjustment is there!

 

[chickenman242]

If you want the telemetry you need a trx flywheel I would suggest using an mip clutch if that's the case.i have found the speed output to be a real pain and the first sensor only lasted 2 tanks before failing, I now just use the tamp and volts.
can you get the gears to mesh if not you may have to dremel it out a touch it should however be fine

 

[Nitro4910]

I would go with the M2C clutch and forget about the telemetry.
It's not very accurate and and fails frequently from all I've read, I would rather have the better clutch.

You are correct, there isn't much adjustment on the Revo Picco mount which is kinda disappointing.

 

[chickenman242]

The temp and volts is handy for sure .What I normally do with the temp is get reading for the ipod then get a handheld gun and see what the difference is sometime you can move the sensor around to get it a bit more accurate