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robplumber View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote robplumber Quote  Post ReplyReply Direct Link To This Post Topic: top speed
    Posted: 27 Dec. 2014 at 3:54pm
I have been curious since I started driving my 47, what is my top speed? My speedometer is definitely off,I just wasn't sure how much.
So today I took advantage of the beautiful weather and downloaded a gps speed app to my phone,then went out driving.
I topped out at 52 mph. That was on a nice paved road, but not a highway.
I think if I pushed it, I could get 55.
I Don't usually ever go above 40 though. That's a comfortable speed to cruse for me. Any more and I feel like I'm going to kill the engine!
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Lee (MN) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lee (MN) Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 4:06pm
Sound about right, 45 is all you want to ask of these rigs. My speedo is right on as far as gps goes. With an OD you can run 45-50 nicely.

Lee
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaksjep Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 4:21pm
My '46 CJ2A with an F-Head gets me 48 mph and it is screaming in protest.  I like about 40 or so as a max...
My posts are my personal opinion and are not legal advice as I am not an attorney. If you act on any of my comments you do so at your own risk.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldtime Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 5:06pm
Stock standard with 29" tall tires at maximum crankshaft velocity of 4000 RPM = 60 MPH.
 
The maximum efficient RPM for a G0-Devil is the same as the maximum torque output @ 2100 RPM.
With standard 29" tall tires the pre 1963 CJ's will optimally cruise at 35 MPH.
 
Not nearly as efficient but I will recommend an absolute maximum sustained RPM of 3100.
The maximum sustained speed then becomes 50 MPH.
Beyond that the MPG and the engine longevity suffers horribly. 

Add a 25% O.D. and the ideal cruise speed increases to 47 MPH with a maximum sustained speed of 66 MPH.
 
Sufficient HP to tackle hills and head winds at hiway speed is a separate concern.
 
 

 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PhillipM Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 6:30pm
Mine will get to 50 fairly well, 55 is a strain, and if I hit a long flat or slightly downhill, 60. Going over 50 raises the engine temp from 185 to 210.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TERRY Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 6:47pm
Rob,
Don't forget the "highly efficient" brakes, be kind to the drivetrain and yourself with the speed!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Adrian Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 8:21pm
I am sitting on the fence at the moment deciding to try and find an Overdrive or fit the PTO set up I have.

I have 600-16s on Jeep and as long as it will sit on 40mph I will be happy enough.

I guess the compromise is to go to 6.50s or even 7.00s  to gear it up a bit?, I think both were options when the Jeep was new and I like the look of NDTs.

Adrian
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 8:52pm
29" tall tires, 5.38 rear gears, T-90 tranny in 3rd, D-18 in hi range, Your engine rpm will be 3450 at 55.3mph
Right on the dash on my CJ-2A is says Max Speed 60mph which with 29" tall tires is 3750rpm
 
Speed calculator can be found here
 
 
 


Edited by Mark W. - 27 Dec. 2014 at 8:54pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PhillipM Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 9:53pm
The brakes aren't bad if restored and adjusted correctly.
"90% of all carburetor problems are electrical"
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Post Options Post Options   Thanks (0) Thanks(0)   Quote berettajeep Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 10:16pm
Mine is happiest at being around 43 at top speed. I would love an overdrive but not to go faster, just to keep the RPM's down and have 6 forward gears.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bretto Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 10:29pm
My max is probably 45. I feel I'm abusing it pushing it into the 50‘s. I have an overdrive and have really enjoyed the splitting of gears and helping out in lowering the top end RPMs. I use it for nothing related in trying to go faster.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lee (MN) Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 10:32pm
Originally posted by Adrian Adrian wrote:

I am sitting on the fence at the moment deciding to try and find an Overdrive or fit the PTO set up I have.

Adrian


Why not do bolth.

Lee
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpet Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 10:34pm
Not saying you should do it ....

http://m.youtube.com/watch?v=oMUi3tN3bQw


.. just saying you can do it.

Works better with the windshield down.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpet Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 10:41pm
This one was after my engine rebuild:

http://m.youtube.com/watch?v=2RrM9fSzHj0



... On flat land with the windshield down and overdrive.

Here is the GPS confirmation:



The max speed shows 68

Edited by jpet - 27 Dec. 2014 at 10:43pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote berettajeep Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 10:45pm
Originally posted by jpet jpet wrote:

Not saying you should do it ....

http://m.youtube.com/watch?v=oMUi3tN3bQw


.. just saying you can do it.

Works better with the windshield down.



Show off! LOL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WorkInProgress Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 11:06pm
yes Adrian if you buy the adapter you can use both the pto and the overdrive
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Adrian Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 11:07pm
Originally posted by Lee (MN) Lee (MN) wrote:

Originally posted by Adrian Adrian wrote:

I am sitting on the fence at the moment deciding to try and find an Overdrive or fit the PTO set up I have.

Adrian


Why not do bolth.

Lee

How?, I thought once the PTO bolted to the back of the gearbox I lost the spot for the OD?

Adrian
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Adrian Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec. 2014 at 11:19pm
Oh No....more $$$$$$, better get it going first, just doing the rear wheel bearings now, about to measure up the shims, ..I'd like to get it sitting back on its wheels before the holidays here are over, then once the new gearbox mainshaft arrives, yippee....the engine, gearbox and TC can all go back in.

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