A couple of questions

[cbvet]

M813A1 with Cummins. No sticker on tach. What's safe maximum RPM?
1400-20 tires, 151" to 152" circumference. What should vehicle speed be, say in 5th at 2000 RPM?
Can someone tell me the formula for different RPMs?
Okay, that's 3 questions.
But I know you can handle it.
Thanks,
Eric
CBVET

 

[Cdub]

Hi Eric,

With the same combo as yourself....except for the trany...I like to keep it under 2100 rpm's......

At 2100 rpm's your speed should be around 62-65 mph, which should be fast enough..

seya,

C'dub

 

[m16ty]

I've always been told not to ever go over 2100 or let the engine pull down to under 1200 on a Cummins. Lugging it under 1200 can be as harmfull as going over 2100.

 

[cbvet]

Thanks guys!
Apparently my speedometer is accurate enough.
If I can run 50-55 I'll be quite satisfied.
Eric
CBVET

 

[Cdub]

50-55 is a real nice cruz'n speed for the my five ton......Tires, steering....and just enough power on reserve for the hills

Over 60 feels like your pushing it a little to much.

Enjoy the spring time and drive'n in the 813.

Cheers,

C'dub

 

[emr]

Good Post...Thanks I learned something again, and am going to put a red arrow on it!...Randy