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Old 01-18-2008, 11:07 AM   #1
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Default The all in one (12th / touring) 17.5 gearing thread (Novak LRP Tekin Orion)

just trying to get a place started as the onslaught of questions arise.

I just ordered a novak 17.5

going to start out about a 3.0 or 76mm on my 12th scale

and probably 2.0 or 51mm on my touring

anybody been running them yet? or had access to the other companies.
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Old 01-18-2008, 11:11 AM   #2
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Default 17.5 gearing

I had read on the CRC forums that some had been running the 17.5 at 3.1" in their 12th scale cars on their 60'x36' track and running very comparable times to the stock brushed motors. That is all I can offer at the moment. Will be testing 10.5 at our new 90'x36' club track in Minot, ND leading up to the nationals at the Hobbyplex in Omaha NE.

Mitch Witteman

Last edited by flyernemesis; 01-18-2008 at 11:26 AM. Reason: adding in our track dimension
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Old 01-18-2008, 11:13 AM   #3
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just trying to get a place started as the onslaught of questions arise.

I just ordered a novak 17.5

going to start out about a 3.0 or 76mm on my 12th scale

and probably 2.0 or 51mm on my touring

anybody been running them yet? or had access to the other companies.
We've been running the 17.5 in 1/12th for a little while now. Rollouts of 85 to 90 are common, and this is on small tracks, 65'-75' length
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Old 01-18-2008, 11:20 AM   #4
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WOWZERS, when will that pinion gear become larger than the spur
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Old 01-18-2008, 11:49 AM   #5
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I rolled a 17.5 at 3.46" in 12th at CEFX last weekend and it felt a little overgeared. It was in the ballpark though. I think that corner speeds are going to drive the gearing in 17.5 and the gear will be totally track dependant.
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Old 01-18-2008, 11:49 AM   #6
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WOWZERS, when will that pinion gear become larger than the spur
Careful what you wish for......
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Old 01-18-2008, 01:10 PM   #7
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Hey Nash-

At Novak for the sportman class (touring car w/rubber tires) we had it geared at a 3.9 final drive.
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Old 01-18-2008, 01:36 PM   #8
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Wow 3.9 FDR!?!?! For the 416 with a 105 spur that's a 55 tooth pinion...
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Old 01-18-2008, 01:37 PM   #9
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Hey Nash-

At Novak for the sportman class (touring car w/rubber tires) we had it geared at a 3.9 final drive.
Were you guys burning up the 17.5's at that fdr???
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Old 01-18-2008, 03:02 PM   #10
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We've been running the 17.5 in 1/12th for a little while now. Rollouts of 85 to 90 are common, and this is on small tracks, 65'-75' length
OD - What size spur/pinions were used?
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Old 01-18-2008, 04:33 PM   #11
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Were you guys burning up the 17.5's at that fdr???

Trackside in Milwaukee. 98 spur and 43 pinion in an Xray. Motor temped out at 160 deg. We were down to a 3.8 FDR and the motor was at 175 deg so i took a tooth out to be safe.
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Old 01-18-2008, 04:56 PM   #12
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OD - What size spur/pinions were used?
76 tooth PRS spur. If the spur was any smaller the pinion would hit the diff rings I can't believe I'm carrying 45 to 50 tooth pinions in my race box now

I've shown this before, but it looks like we're not too far off from actually needing it. The OD Racing Spur Gear Adapter!
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Old 01-18-2008, 07:20 PM   #13
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I have robinson 78 tooth gears and everthing from 22 to 47 in my box. skeen has up to 57 tooth pinion for running outdoors 12th stock on a 160 foot straight. so I can only imagine. I actually had a 72 tooth back in 96 for running 10th oval at the velodrome in indy. but I heard the 12th scale guys at the track were in the 1:1 or 1:1.2 range back in 95. I have a feeling that if the track is bigger like outdoor pavement, then more prostock drivers will end up in the 13.5/19t class. 17.5 would be like running mini at the tamiya track or speedworld. your looking at 30 or 40 second laps.

my track only has a 70' straight so some of these should be a good starting point. has anybody run some of the other 17.5s other then novak? I know the gearing on the lrp 13.5 was a couple teeth different.
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Old 01-18-2008, 08:44 PM   #14
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Originally Posted by odpurple View Post
76 tooth PRS spur. If the spur was any smaller the pinion would hit the diff rings I can't believe I'm carrying 45 to 50 tooth pinions in my race box now

I've shown this before, but it looks like we're not too far off from actually needing it. The OD Racing Spur Gear Adapter!

OMG, is that adapter actually available?
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Old 01-19-2008, 06:26 AM   #15
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Wow 3.9 FDR!?!?! For the 416 with a 105 spur that's a 55 tooth pinion...
We run the 17.5 now in Trans Am cars (4-cell touring cars on rubber tires), and we tested that motor down to a 3.67 FDR. It was fast, torquey and really nice to drive on all parts of the track. Felt like stock racing of years gone by. We determined that to prevent any unbalanced competition with current brushed motors and ridiculous gearing in some older shaft drive TCs, we limited the FDR to 4.0 with the 17.5. The motors are barely even warm to the touch. There is still a lot more that they can take.

As brushed motors in this class fall by the wayside, that limiting FDR will go away in this class.
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