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willysmjeeps.com :: View topic - M38 vs MB
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M38 vs MB

 
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ClarkJ
Member


Joined: Apr 20, 2005
Posts: 13

PostPosted: Sat Oct 22, 2005 6:45 pm    Post subject: M38 vs MB Reply with quote

I was talking with a guy and he told me a WW2 Jeep goes faster than a M38.Any truth to that?Clark.
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Bob_C
Site Administrator
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Joined: Apr 03, 2005
Posts: 269
Location: Chester County, PA

PostPosted: Sat Oct 22, 2005 7:57 pm    Post subject: Reply with quote

Ehhhh....

Both are geared down so insanely low with low horsepower engines that I doubt that the speed difference between the two vehicles is noteable.
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Bob Collins
1954 M38A1 MD79056
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MajBen
Major, USMC, Retired


Joined: Apr 11, 2005
Posts: 88
Location: Missouri

PostPosted: Sat Oct 22, 2005 8:00 pm    Post subject: Reply with quote

Hi, I was thinking that that there is a difference in the gear ratio but lopo many be right in that there is no noticeable difference. SF Ben
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Semper Fi Ben M38 & M100
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Bob_C
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Joined: Apr 03, 2005
Posts: 269
Location: Chester County, PA

PostPosted: Sat Oct 22, 2005 8:54 pm    Post subject: Reply with quote

Well now, wait a sec.

MB has a differential ratio of 4.88 to 1...so every 4.88 driveshaft revolutions = 1 axle revolution.
M38 (and M38A1) have a differential ratio of 5.38 to 1.

So yeah, I guess the MB would go faster in theory.

But id still doubt youd even notice it. 63 or 65 miles an hour - what difference does it make?
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Bob Collins
1954 M38A1 MD79056
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wesk
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Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Sat Oct 22, 2005 11:04 pm    Post subject: Reply with quote

You guys forget that the tire diameters are different. The MB with 4.88 gears has a 6.00x16 tire and the M38 with 5.38 gears has a 7.00x16 tire. This almost effectively canx any advantage or disadvantage each jeeps gearing has over the other. The real reason the MB was a little fast at the top end was it was considerably lighter and the engine wasn't turning a dual belt 24 volt 25 amp generator. The M38 would probably accelerate a litttle faster. However when the Army saw the M38A1 performance figures they dumped both the MB and the M38 in favor of the A1's F134 with 72 HP.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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