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Dauntless or Kubota

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52 M38 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 52 M38 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Mar. 2019 at 11:58pm
Originally posted by chasendeer chasendeer wrote:

The issue is with the crawl speed will go way up on the diesel combo. If a odd fire will crawl around 600 rpm and the diesel is around 1000 rpm even with the heavy fly wheel.

Interesting point my kubota tractor idles just below 1000, I have a distinct feeling it would be unhappy below that.  I may need to do some calculations as to what my crawl speed would be.  What is the lower rpm for useable power with the kubota?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nothing Special Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 12:14am
If you are going to use the Jeep to crawl, crawl speed is VERY important!  Energy is proportional to the square of the speed, so cutting your actual crawl speed in half means you are hitting the rocks with only 1/4 as much energy.

So if crawling is in the cards, the difference between 1000 and 600 rpm would be very significant (only hitting the rocks 1/3 as hard).
Bob

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oldtime View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldtime Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 12:28am
Direct from post #1....
Quote   I will never take the jeep on the highway, and it is unlikely that I will rock craw at all with it.
 

Actually the L134 should be somewhere near ideal for that sort of useage.
I took it that you merely felt the 134 was perhaps too slow when accelerating on city streets.

IMHO the Dauntless wins hands down vs both TDI and Diesel engines whenever crawling and or accelerating fast plus sufficient HP for sustained interstate useage.

Real world application makes all the difference.


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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Post Options Post Options   Thanks (0) Thanks(0)   Quote davemacinnh Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 12:31am
Not a chance the dauntless would beat a tdi in a Cj in crawling and absolutely never in accelerating.
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52 M38 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 52 M38 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 12:38am
The crawl ratio for my setup is 39.7:1.  With 31” tires that puts 3mph at just a hair under 1300rpm.  2mph is 860rpm. It would appear without terra-low the kubota will run right around 3mph, the Dauntless comfortably below 2mph, approaching 1mph.
http://www.4lo.com/calc/gearratio.php

I am not sure that helps my decision. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jeepsterjim Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 12:40am
I like the dauntless/Buick V-6. However I like its big brother better...252 V-6 with TBI.  lots of torque. When set up, the motor would idle around 650 rpm. Used this motor along with a SM420, D300 w/low gears, and 4.88s.  

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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldtime Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 12:42am
Quote  Not a chance the dauntless would beat a tdi in a Cj in crawling and absolutely never in accelerating.
TDI Engine specifications simply don't support that claim.

And the increased idling RPM only serves to amplify Gear Ranging concerns for crawling usage.
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Millennium falcon Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 12:46am
Haha you apparently have never driven a tuned tdi.... they pull very hard. I personally haven’t driven a duantless Jeep so I’m not going to make any bold statements if I can’t back them up with real life experience. A tuned tdi will roast tires and move you from a-b very quickly with almost zero lag thanks to the variable geometry turbo. Dave: I’m sure you would agree.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote davemacinnh Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 12:50am
Real life data does support that claim though. It’s fine though if you don’t want to admit that a tdi is a legitimate swap candidate though. There are lots of people that say “look at the data”.(which actually proves a tdi is faster 0-60 anyway. I’m living in the real life where I own a tdi Willys, friends with dauntless and seen the kubotas in action. All cool motors but nothing comes close to the tdi. Haters gonna hate though and I get that.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote davemacinnh Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 12:51am
Millennium, I have driven the dauntless and they are really nothing special or quick about them.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldtime Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 12:56am
Quote  MY vote is for VW TDI! Here is mine... Its lighter than the 134, It makes 120hp/200tq makes usable power from 1000-4000rpm.

Dauntless Buick 225 V6 
Horsepower (net)160 @ 4200
Torque (net) 235 @ 2400
Idles down to 500 RPM
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote 52 M38 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 12:58am
To get back on point, TDI’s are great, I own one, it flies but is irrelevant in this thread.

Do any of the kubota guys worry about the unknown and likely over 8,000 hrs on the V2203 engines?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TateC Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 1:07am
My goodness, for a minute there I thought I was looking on G503 forum.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote chasendeer Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 1:09am
Originally posted by TateC TateC wrote:

My goodness, for a minute there I thought I was looking on G503 forum.

So true!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Millennium falcon Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 1:09am
Oldtime: I’m not trying to win any competition....apparently you are! Haha... but that has been proven over and over on pretty much every post I make. This guy asked for opinions on diesel swaps. I gave m. Opinion based on my personal experience...nothing more. I also didn’t diss any other engines in the process. How dare anyone have a different opinion than you. Haha! You win, you’re smarter and faster than everyone. Haha! 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 52 M38 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 1:18am
Originally posted by 52 M38 52 M38 wrote:

To get back on point, TDI’s are great, I own one, it flies but is irrelevant in this thread.

Do any of the kubota guys worry about the unknown and likely over 8,000 hrs on the V2203 engines?

Bump.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hotrod59 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 1:19am
Just finished my 225 swap, it is a rocket now! It will easily do 65mph+ I kept the T90 in it for now. Haven’t taken it off road much yet, but the little I have it does well. I would go V6. 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar. 2019 at 2:30am
WHAT on earth does acceleration and speed have to do with Off road crawling. An engine that can't run at under 900rpm can't move a vehicle as slow as an engine that can run at 600rpm give the same drive train and tires. It just can't. Now if you want to bounce over stuff 2mph faster then cool. BUT its not the same thing.
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