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robplumber
Member Joined: 19 Dec. 2013 Location: edison n.j. Status: Offline Points: 458 |
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Posted: 27 Dec. 2014 at 8:54pm |
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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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1953 cj3a modified
1947 cj2a stock and beautiful 1998 xj lifted 1999 xj stock |
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Lee MN
Member Joined: 13 Aug. 2008 Location: Harris, MN Status: Offline Points: 4923 |
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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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LEE
44 GPW-The Perfected Willys 49 2A “If you wait, you only get older” 67 M715 American Made Rolling History |
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jaksjep
Member Joined: 03 Nov. 2013 Location: Southern CA Status: Offline Points: 471 |
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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...
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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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oldtime
Member Joined: 12 Sep. 2009 Location: Missouri Status: Online Points: 4139 |
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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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Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963) Zero aftermarket parts |
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PhillipM
Member Joined: 28 May 2012 Location: Jackson, MS Status: Offline Points: 560 |
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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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"90% of all carburetor problems are electrical"
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TERRY
Member Sponsor Member Joined: 22 May 2007 Location: BOULDER COLORADO Status: Offline Points: 3396 |
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Rob,
Don't forget the "highly efficient" brakes, be kind to the drivetrain and yourself with the speed! |
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BOULDER 48 2A
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Adrian
Member Joined: 01 Oct. 2011 Location: New Zealand Status: Offline Points: 1517 |
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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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1946 CJ-2A Column Change 14605
1973 Saab 96 |
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Mark W.
Member Sponsor Member Joined: 09 Nov. 2014 Location: Silverton, OR Status: Offline Points: 7923 |
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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. - 28 Dec. 2014 at 1:54am |
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Chug A Lug
1948 2A Body Customized 1949 3A W/S 1957 CJ5 Frame Modified Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962 |
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PhillipM
Member Joined: 28 May 2012 Location: Jackson, MS Status: Offline Points: 560 |
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The brakes aren't bad if restored and adjusted correctly.
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"90% of all carburetor problems are electrical"
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berettajeep
Member Sponsor Member Joined: 03 Feb. 2009 Location: Astoria OR Status: Offline Points: 4304 |
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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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bretto
Member Joined: 05 June 2010 Location: Orem, Ut Status: Offline Points: 1930 |
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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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Lee MN
Member Joined: 13 Aug. 2008 Location: Harris, MN Status: Offline Points: 4923 |
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Why not do bolth. Lee |
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LEE
44 GPW-The Perfected Willys 49 2A “If you wait, you only get older” 67 M715 American Made Rolling History |
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jpet
Moderator Group Sponsor Member x 5 Joined: 30 Apr. 2008 Location: Ramsey, IL Status: Offline Points: 11173 |
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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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CJ2A #29110 "General Willys"
MB #204827 "BAM BAM" "We do what we can, and we try what we can't" |
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jpet
Moderator Group Sponsor Member x 5 Joined: 30 Apr. 2008 Location: Ramsey, IL Status: Offline Points: 11173 |
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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 - 28 Dec. 2014 at 3:43am |
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CJ2A #29110 "General Willys"
MB #204827 "BAM BAM" "We do what we can, and we try what we can't" |
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berettajeep
Member Sponsor Member Joined: 03 Feb. 2009 Location: Astoria OR Status: Offline Points: 4304 |
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Show off! |
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WorkInProgress
Member Joined: 13 Nov. 2013 Location: Kennewick, WA Status: Offline Points: 829 |
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yes Adrian if you buy the adapter you can use both the pto and the overdrive
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My toys
1948 CJ2A 1959 CJ5 1952 M100 TRAILER |
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Adrian
Member Joined: 01 Oct. 2011 Location: New Zealand Status: Offline Points: 1517 |
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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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1946 CJ-2A Column Change 14605
1973 Saab 96 |
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Adrian
Member Joined: 01 Oct. 2011 Location: New Zealand Status: Offline Points: 1517 |
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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.
Adrian
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1946 CJ-2A Column Change 14605
1973 Saab 96 |
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