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Checkpoint 19turn spec mod

Checkpoint 19turn spec mod

Old 04-12-2006, 11:58 AM
  #121  
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#56 drill bit is .0465". 1/16 would be to big but a 3/64 would be really close.

I ran mine last weekend on a small indoor carpet track (80'x40') with a 30.5 mm rollout with touring car. Temp. was right at 170-175*. The motor was REALLY REALLY. Tons of pull any place in the power band.

take care
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Old 04-12-2006, 12:23 PM
  #122  
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Originally Posted by ottoman
I took mine apart today and it is also Hemi wound.... so unless ROAR changed their rules (again) this motor wont be legal
is there a difference between Hemi & cross wrapped ??
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Old 04-12-2006, 12:32 PM
  #123  
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Originally Posted by MR JOLLY
is there a difference between Hemi & cross wrapped ??
About 1/2 turn.
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Old 04-12-2006, 12:39 PM
  #124  
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Originally Posted by Advil
About 1/2 turn.
so which one is 19t?? or which one is 18.5t ??

also is there a uk spec one & a usa spec one
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Old 04-12-2006, 12:42 PM
  #125  
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Originally Posted by JohnB
#56 drill bit is .0465". 1/16 would be to big but a 3/64 would be really close.

I ran mine last weekend on a small indoor carpet track (80'x40') with a 30.5 mm rollout with touring car. Temp. was right at 170-175*. The motor was REALLY REALLY. Tons of pull any place in the power band.

take care
john
Thanks
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Old 04-12-2006, 01:08 PM
  #126  
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Originally Posted by MR JOLLY
so which one is 19t?? or which one is 18.5t ??

also is there a uk spec one & a usa spec one
Hemi is about 1/2 turn short. Mabuchi X-over style would be 19 even.

I have no info on the uk vs. us spec. Sorry...
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Old 04-12-2006, 01:18 PM
  #127  
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Originally Posted by ERTRACHTER
hey darksied my name is jason ertachter i run for checkpoint and i pretty much only race on rubber tire asphalt and if i can come off the track and my money motors only 140 i would be pretty happy on average mine are about 150 to 170 degrees i try to keep it no higher than 160 i run it about 15 to 20 times before i even think about opening just letting you know my thoughts
Thanks for the thoughts.

I did get mine up to a max of 160 degrees while trying to find just the right gearing for my indoor track. But I wasn't too sure about having it that warm, so I backed off on the gearing a bit. I didn't need the extra speed for that track anyway.

Like I said, I didn't really have plans on opening the motor up, but having it arch so much drove me to cut the comm earlier than I had planned.

Got any tips about which brush/springs I should run for outdoor asphault?
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Old 04-12-2006, 01:23 PM
  #128  
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What are the benefits of drilling the hole in the brushes. I've done it to my brushes before, but mainly because my more motor savy buddies told me to.

Since I'm trying to become more motor savy myself, I would like to know exactly what effect the hole in the brush has.

Thanks
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Old 04-12-2006, 03:06 PM
  #129  
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I've drilled my brushes for years until I found out from the "Motor Man" Big Jim Grenemier. Big Jim said that the hole in the brush contact surface caused more pressure is applied to the area surrounding the hole in the brush with the same amount of pressure from the same springs, with I am guessing less or equal drag on the brushes.
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Old 04-12-2006, 03:37 PM
  #130  
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Originally Posted by Darkseid
What are the benefits of drilling the hole in the brushes. I've done it to my brushes before, but mainly because my more motor savy buddies told me to.

Since I'm trying to become more motor savy myself, I would like to know exactly what effect the hole in the brush has.

Thanks
Placing a cavity or "HOLE" in the brush to me seems to run a hair cooler and my top end speed seems a bit better as well.
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Old 04-12-2006, 03:41 PM
  #131  
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Originally Posted by STLNLST
Placing a cavity or "HOLE" in the brush to me seems to run a hair cooler and my top end speed seems a bit better as well.
To me it seems like you trade low end (punch) for some top end (RPM). Don't go by what I say though....I don't know much about motors.
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Old 04-12-2006, 03:50 PM
  #132  
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Originally Posted by Advil
To me it seems like you trade low end (punch) for some top end (RPM). Don't go by what I say though....I don't know much about motors.
There is that small sacrafice of punch when you place a cavity hole in the brush due to there being a little less contact patch on the surface of the comm. No one here in Norcal will spend the time to tune their motors the way we do so that's why they always want us to do a motor for them If the rain ever stops it's curtains for my fellow racers once I hit the straight
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Old 04-13-2006, 04:45 AM
  #133  
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Originally Posted by MR JOLLY
so which one is 19t?? or which one is 18.5t ??

also is there a uk spec one & a usa spec one
Colin

No different spec, they're all the same and they're all legal.

Stu
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Old 04-13-2006, 07:21 AM
  #134  
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Well if it gives a boost to RPM with a sacrifice to punch, then drilling the hole would seem to fit with this motor. Even with a sacrifice to punch, this motor will have plenty of torque to spare. But it could do with a little more RPM, at least for TC racing.

I think I'll give the hole a try.

JPHRacer also mentioned the use of Silver springs. These are the Hard springs and are harder than those that come stock with the motor, what is the effect of harder springs on RPM and Punch.

Thanks.
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Old 04-13-2006, 09:41 AM
  #135  
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Originally Posted by Advil
Hemi is about 1/2 turn short. Mabuchi X-over style would be 19 even.

I have no info on the uk vs. us spec. Sorry...

stuart is this post true
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