The CCW Tha Heist and my day with PIT Motors LTD - Page 3

gardo · 03-25-2011, 08:23 AM

Spoke to the Guys down in PIT Motors LTD and they will be doing some live load testing cause I was thinking of taking the 15/42 to a 15/38

Will keep you guys posted

Barnone · 03-25-2011, 11:07 AM

Gardo,
That 15/38 would be the same as my 13/33 which might be a little high for a young guy like you. Anyway it's easy enough to change the rear sprocket with the right o-ring pliers.

Be nice to see the dyno power curve from PIT. I might take mine over to my dyno guy.

gardo · 03-25-2011, 11:57 AM

Barnone - I dont understand your meaning of "too high" could you explain please

thx

RageHardIntoTheBendies · 03-25-2011, 12:24 PM

I'm running 15-42 on my 167fmm and it will stay pinned at 8k rpm+ on all but the steepest hill. I'm going to a 16-42 and I'm sure it will pull it fine as this motor is all low end. This is on a an upright dualsport so I'm sure you should be fine.

Weldangrind · 03-25-2011, 12:38 PM

Quote:

Originally Posted by gardo

Barnone - I dont understand your meaning of "too high" could you explain please

thx

Too high refers to a numerically low gear ratio (I know, it sounds confusing). See this chart: http://www.jtsprockets.com/fileadmin...tgearratio.pdf

A 15/42 combo is a 2.80:1 ratio, and a 15/38 combo is a 2.53:1 ratio. The 2.53:1 ratio is higher (which is lower numerically), and that translates to more top end speed and less low end acceleration. The reverse is true for the 2.80:1 ratio.

Barnone · 03-25-2011, 02:24 PM

W&G,
Good explain as Darrell Waltrip 0f NASCAR fame says.

Barnone · 03-25-2011, 02:32 PM

Quote:

Originally Posted by RageHardIntoTheBendies

I'm running 15-42 on my 167fmm and it will stay pinned at 8k rpm+ on all but the steepest hill. I'm going to a 16-42 and I'm sure it will pull it fine as this motor is all low end. This is on a an upright dualsport so I'm sure you should be fine.

Rage,
Thanks for the numbers and confirmation of my suspected low end power of the 167FMM engine. At least that how it feels to my butt dyno.

RageHardIntoTheBendies · 03-25-2011, 02:45 PM

Yea makes me wish there were hotter cams for this engine as I'm sure
there would be a pony or 2 to be had there.

gardo · 03-25-2011, 05:48 PM

Thanks WG that makes a bit more sense. i figure that i rode a Heist with the stock 15/42 I will play with it stock for now and play with the numbers some with the guys from PIT

katoranger · 03-25-2011, 08:32 PM

Easy thing to try would be to swap a 16 or 17 sprocket on the front.

Weldangrind · 03-25-2011, 10:39 PM

Quote:

Originally Posted by RageHardIntoTheBendies

Yea makes me wish there were hotter cams for this engine as I'm sure
there would be a pony or 2 to be had there.

You can always use a regrinding service. Colt and Shadbolt are in the Lower Mainland. China cams must be available for cheap, so I'd buy a new one and hand that to the grinder.

03-25-2011, 12:24 PM	#34
RageHardIntoTheBendies Join Date: Oct 2010 Location: Victoria, BC Posts: 114	I'm running 15-42 on my 167fmm and it will stay pinned at 8k rpm+ on all but the steepest hill. I'm going to a 16-42 and I'm sure it will pull it fine as this motor is all low end. This is on a an upright dualsport so I'm sure you should be fine. __________________ Saga 250 Enduro
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03-25-2011, 02:45 PM	#38
RageHardIntoTheBendies Join Date: Oct 2010 Location: Victoria, BC Posts: 114	Yea makes me wish there were hotter cams for this engine as I'm sure there would be a pony or 2 to be had there. __________________ Saga 250 Enduro
	0

03-25-2011, 08:32 PM	#40
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	Easy thing to try would be to swap a 16 or 17 sprocket on the front. __________________ You meet the nicest people on a Honda Clone.
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03-25-2011, 08:23 AM	#31
gardo Join Date: Mar 2011 Posts: 54	Spoke to the Guys down in PIT Motors LTD and they will be doing some live load testing cause I was thinking of taking the 15/42 to a 15/38 Will keep you guys posted
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03-25-2011, 11:07 AM	#32
Barnone Join Date: Feb 2007 Posts: 1,354	Gardo, That 15/38 would be the same as my 13/33 which might be a little high for a young guy like you. Anyway it's easy enough to change the rear sprocket with the right o-ring pliers. Be nice to see the dyno power curve from PIT. I might take mine over to my dyno guy.
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03-25-2011, 11:57 AM	#33
gardo Join Date: Mar 2011 Posts: 54	Barnone - I dont understand your meaning of "too high" could you explain please thx
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03-25-2011, 02:24 PM	#36
Barnone Join Date: Feb 2007 Posts: 1,354	W&G, Good explain as Darrell Waltrip 0f NASCAR fame says.
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03-25-2011, 05:48 PM	#39
gardo Join Date: Mar 2011 Posts: 54	Thanks WG that makes a bit more sense. i figure that i rode a Heist with the stock 15/42 I will play with it stock for now and play with the numbers some with the guys from PIT
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