Some Guidance Please

whats a good rpm range for the duantless?

 

Others should chime in but I think 2500-2800 for your target cruising speed.

 

You are a lot of specialists on the forum, I never tried to understand what ratio I have, it works like this with my small F 134.
I just use my Jeep for going to village, neighbors, etc... and it is a flat country.
But I wonder... a F134 is 2,2 liters with 72 hp.
A Mercedes or Audi or others, with a 2 liters, get 300 hp! Maybe I can find a way to add some horses ? with lot of $$ !
A BMW with a 3 cyl get around 200 hp

 

No problems here with my 225 T18 D18 3.73 and 33x10.5. A V6 is probably a better choice than an SBC but a buick V8 would be pretty cool and something I would do if I ran out of projects (just don't know if the V8 ruins the nicely balanced chassis feel we have now).

 

Starting with the antique geometry (stroke ratio), there are clear engineering reasons why getting a lot more power from the F134 would require heroic changes. I think everyone would agree it would be both easier and cheaper to replace the F134 with a more modern engine, compared to say, doubling its output. Turbocharging or supercharging seems like an obvious approach, and several have tried. Replacement engines (or donor vehicles) like the Buick or Chevrolet V6 are cheap and widely available in the USA. There is also a lot of published and online advice and experience to assist with an engine swap; not so much for the extensive changes needed to make the F134 produce comparable power.

Origins: Willys 77 - Wikipedia The engine has already gone through two revisions to make more power; first for the WWII Jeep Willys Go Devil engine - Wikipedia and later to make the F134.

 

The earliest Chevrolet small block was a 265 cid. This first appeared in the 1955 Chevrolets as I recall. Only the 1955 block lacked any provision for an oil filter, according to Wikipedia. Maybe it would be of value to someone because it's an early block?

You realize that the 4.3L V6 is 262 cid, and would be easier to fit in the engine compartment than the V8. Lots of cars, vans and pickups used this engine, and you should be able to find an ugly-but-running donor if you look around. Maybe even with factory fuel injection. The Buick V6s are easier to fit in the engine compartment because the distributor is at the front, but I think availability argues in favor of the Chevy. Lots of the engines have been put in CJ-5s, and I'm sure you could get plenty of help here based on first-hand experience.

 

i am kinda thinking that. I tossed it out here since i have one already. Im thinking the v6 would be about right too. Probly eaier to cool too

 

I think you're on the right track keeping it Buick. The 4.3 is all in all amazing but the 225 makes my Jeep accelerate plenty fast if not more than I would ever need. Once you get that 225 in there and you buy a brand new 225 V6 shroud you'll be damn proud of how nice your underhood looks. Won't need funny looking additional fans or anything - just a good basic and all mechanical underhood.

 

i was thinking the same thing, i can get a duantless for a good price thinking of going that route. The v8 i have was in a flatty i got the whole complete chassis for a trade. Brain storming ideas and this board is such a grey help

 

all mechanical under hood is my goal. I have always liked the duantless. Does the duantless sound good with a after market exhaust? honestly im sure id be happy with the performance i dont hate my fHead just need a bit more fore todays toads

 

Lots of YouTube videos....personally I don't like the sound of an unmuffled 6 cyl but thats just me.

 

I have a 198, which I understand is very similar to the 225. It has a very nice exhaust note. although I will say it is pretty loud, especially with the exhaust dumping out the sides. Personally I would go for the quietest muffler you can find. It will still have plenty of growl.

 

Your having to spin allot more rpm to go the same speed.

I was running T18, D18 and 4.27 gears for a crawl ratio of 66:1. With 31's I was turning 3000 rpm on the highway at 65.
I swapped stuff to T18, D20 with 3.15 terra low and 3.31 gears for a crawl ratio of 66:1.... still on 31's.... lowered the highway cruising to 2400 rpm.
I have since swapped to 33's for better wheeling performance. I still like the 3.31 gears, 3.73 would work great too.

If you run the Sm420, D18 with terra low 3.15 and 3.73 gears with 33" tires you will have a crawl of 83:1 and turn roughly 2500 rpm on the freeway.
That's a sweet spot for the dauntless to run on the highway and 83:1 crawl is more than enough for most wheeling.

Steve is currently running a Sm420, D18, and 3.31 gears on 33's with a crawl of 57:1... this winter we will be installing terra low gears to increase his crawl ratio to 74:1.... Quite respectable crawl, freeway cruise.... and no overdrive to break.

4.88, 5.13 and 5.38 gears are a crutch to overcome the lousy first gear ratios in t90's, t14's and t15's ect......
Its way outside the box of most jeep setups. I have had some amusing talks with guys who are running t90c's and 5.38's who think they have a great crawl ratio of 44:1 ..... I tell them I am running 3.31 and they poo poo my jeep..... until I do some simple math in front of them and they walk away scratching their head....

 

My 71 came to me with a Buick 350 and I'm going to put a V6 back in it. Not enough room for an effective radiator. At least the engine mounts and bellhousing were unchanged.

 

I'd like this idea better it you could get an actual 4 or 5 speed in there (as i mentioned before, the truck 4speeds are really a 3 speed + a granny gear)....the Dauntless doesn't really have enough power for only 3 gears IMO.

 

I wore mine out but I didn't break it. Its common to see wear on the planetary hub, where the needle bearings ride on it.

 

Well sort of. If you build the engine big enough and with the right parts to generate REAL low end torque, that ultra low first gear becomes WAY less important. And the overall performance, at least in my opinion, is greatly enhanced. That said, certainly not the cheapest option.

I'm also of the firm opinion that most overdrive breakage isn't due to the design (the exception being Saturn's shift fork arrangement). It's more operator error as in letting the lube get too low or not getting that snap ring in where it belongs. But taking a main drive gear, nut, and cover along isn't a bad idea.

 

the long tube headers and shorty mufflers on the boys 70 emulates a group o Harleys perfectly. enough that during bike week the groups o bikes will look around for the other group that is a jeep.

 

I was just saying about 2 liters engine with 400 HP for small talk!
I keep my Jeep like it is, today a small trip to the honey producer, nice weather, children say hello.
The sound of the F 134 is good, people in the village turn heads. Amazing how children like the Jeep, it is like a toy.
The honey producer likes the Jeep, our mason likes our Jeep and some envy on eyes. The engines starts at first pression.
I made install a "push" button to start the engine, turning the key to start is not good. I turn the key to get contact. Then "push" and bingo, music.
Of course a V6 or other is nice, but I don't feel high speed with my Jeep.
A calm ride on small roads is enough for me, smell of the countryside, land, fields...