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#1
11-04-23, 00:10
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The two things I have concern with......
A top speed of 55 mph with standard C15a axle gear ratio.......
My 261 stock rebuilt gives me 44 mph with the 10:50 Chevron tyres and that is pushing near 2990 RPM........ Now my speedometer has not been calibrated using a GPS reading and I think my rpm meter is reasonably close to a testing separate rpm meter gauge. Planning to calibrate the NOS GMC speedo with a telephone app this Spring.''I do have a mounted set of NOS 9:00 x16 Michelin that have not tried yet.. I believe from all account thats the radial are far smoother b ut not sure they would increase the top speed unless the rolling diameter is greater than the 10:50....... How do I get more top speed without pushing the 261 much over 3000 rpm???? 44 mph is a handful not sure I would feel comfortable at 55....... Note that non of my tires have ever been balanced yet....... one truck tire shop would not tackle the 10:50 on my CMP rims ..... have yet to check with Benson truck shop.... Properly adjusted new brake linings on radius linings matched to turned drums seems quite adequate. Comments/suggestions welcome before I paint RED racing stripes on my CMP.......
__________________
Bob Carriere....B.T.B C15a Cab 11 Hammond, Ontario Canada 
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#2
11-04-23, 01:36
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I think Bob C. has preempted my question about roadspeeds on stock 15cwt drivelines. I have had severaal roadworthy CMPs over the years and could never achieve speeds any where near 50mph without fear of engine destruction or vehicle instability resulting in catastrophe.
I have 20 inch wheels and tires on my current 15cwt chev it it wont do 50mph without fear of imminent disaster. So what experience do others have on this question?
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#3
11-04-23, 02:03
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60MPH in a 12 cab CMP. Not the most intelligent choice, but back in the day that’s what she could do.. Was it safe? Foolhardy? Probably
__________________
3RD Echelon Wksp 1968 M274A5 Mule Baifield USMC 1966 M274A2 Mule BMY USMC 1966 M274A2 Mule BMY USMC 1958 M274 Mule Willys US Army 1970 M38A1 CDN3 70-08715 1 CSR 1943 Converto Airborne Trailer 1983 M1009 CUCV 1957 Triumph TRW 500cc RT-524, PRC-77s, and trucks and stuff and more stuff and and....... OMVA, MVPA, G503, Steel Soldiers
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#4
11-04-23, 02:21
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speed
in 2005 coming home on our first big freedom convoy I had on a set of 1100x20 on my C15A, we hit about 65 mph when we just had to pull out and pass an LSVW. Only time I ran the big tires on the C15A.
I regularly cruise at 50 mph (gps confirmed) in my C60L with 1100x20's with the 235 with Fentons.
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#5
11-04-23, 02:36
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Canada's Fighting Vehicles lists maximum speeds between 40 and 50 MPH. The maximums do vary within the same basic model (eg. C60) which I assume may be due to weight as to the best of my knowledge all C60 had the same power, gearing and tires.
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#6
11-04-23, 03:20
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speed
Quote:
Way more useable RPM with the 235 and a few MPH from the 1100 tires.
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#7
11-04-23, 22:43
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Very usable info, will digest and get back on this subject later
__________________
Regards, Hanno --------------------------
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