Author Topic: Top speed and RPM  (Read 5189 times)

Cleprechaun

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Top speed and RPM
« on: November 07, 2018, 05:48:11 PM »
I have read that 45 mph is the top speed of a “White HT”. I opened mine up on a flat dirt road today and got it up to 33 mph according to the old speedometer. It was at 3000 rpm according to a modern cheap tach. Does this seem right ? The engine is a fresh rebuild and seems to run fine.

Hammerhead

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Re: Top speed and RPM
« Reply #1 on: December 24, 2018, 02:55:24 PM »
Mine was 35 MPH and I had to check with my buddy who has had his HT a long time.  He said that was his top speed too.  Going down a hill he said he reached 38 MPH. :D  I had heard 45 also.

spec4don

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Re: Top speed and RPM
« Reply #2 on: December 24, 2018, 05:59:42 PM »
I had mine up to about 40 once, 30 is just Fine!

Don G.
1941 M2A1 not restored
1942 M3 Diamond T Mostly restored
1943 M3A1 Under restoration
1967 M51A2 Tractor
1945 WC 63 needs restoration
1967 M36 Long wheel base duece
1951 M135 GMC Fire truck conversion

Cleprechaun

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Re: Top speed and RPM
« Reply #3 on: January 06, 2019, 09:24:07 PM »
I figured it out. The “economize” valve in the carburetor needed changing. Dramatic difference.

Cleprechaun

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Re: Top speed and RPM
« Reply #4 on: January 07, 2019, 10:07:33 PM »
This fixed it

spec4don

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Re: Top speed and RPM
« Reply #5 on: January 08, 2019, 10:28:19 AM »
Did you clean yours up or put in a new one? If you put in a new one where did you find it?

Don G.
1941 M2A1 not restored
1942 M3 Diamond T Mostly restored
1943 M3A1 Under restoration
1967 M51A2 Tractor
1945 WC 63 needs restoration
1967 M36 Long wheel base duece
1951 M135 GMC Fire truck conversion

Cleprechaun

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Re: Top speed and RPM
« Reply #6 on: January 30, 2019, 10:02:28 PM »
I put in a “new one” from an original old carb rebuild kit

autocar925

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Re: Top speed and RPM
« Reply #7 on: January 31, 2019, 11:58:39 AM »
43 on a long straight run at sea level.  From cold startup, it picks up about 5 MPH in top speed after the tracks get warm.  Tracks suck up a lot of power and they limber up as they get warm.  Seems to have a sweet spot at 28 MPH.  Everything clacking and buzzing along comfortably. 

spec4don

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Re: Top speed and RPM
« Reply #8 on: January 31, 2019, 12:12:27 PM »
That’s about right 30 seems the sweet spot for mine.
Don G
1941 M2A1 not restored
1942 M3 Diamond T Mostly restored
1943 M3A1 Under restoration
1967 M51A2 Tractor
1945 WC 63 needs restoration
1967 M36 Long wheel base duece
1951 M135 GMC Fire truck conversion

Cleprechaun

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Re: Top speed and RPM
« Reply #9 on: June 09, 2019, 11:28:48 PM »
UP DATE:
I can hit 45 easy, but chicken out at 40 mph. The trick was:
New engine broke in at around 100 miles.
Tightened up carb screws and replaced economize valve.
New battery. Had to jump start with old one.
Tracks loosened up I think.
K&N air filter. Original was shot.

Cleprechaun

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Re: Top speed and RPM
« Reply #10 on: April 14, 2020, 10:20:56 PM »
Update: My motor has loosened up, Iv gotten braver, and once the tracks warm up (10 miles) I can hit 50 mph when I’m not paying attention.

R.E.Co.

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Re: Top speed and RPM
« Reply #11 on: April 15, 2020, 07:12:16 AM »
My top speed was 42 MPH without too much tinkering with the carb.  Im sure if I worked more on the mix ratio it could ab alittle higher but who needs to go that fast? Just adds more wear and tear on the halftrack.
1941 White M2
1941 Chevrolet G506 Civilian Dash
1941 Federal 94-43 4-5 Ton COE
1918 3 Ton Field Gun Trailer

spillmk1

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Re: Top speed and RPM
« Reply #12 on: April 15, 2020, 12:07:13 PM »
If you want speed and a MV...
You're gonna need to loose the tires/tracks and get some wings!!!  ;)
1955 M38A1 Jeep
1952 M100 Trailer
1941 M2A1 Half Track
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