wwii go devil engine mods

Ol' Unreliable wrote:   It was enough for Vic Hickey.

Well I don't know about that......that statement 'as written' would be fairly debatable.

It it (134L)had been "enough" Vic never would have gone on to pioneer some of the most innovative desert racers of that time......none of which were 134 powered (for obvious reasons).

He got press for his supercharged flattie but then went on to much better things....so "enough" might have been a stretch........just sayin'

Steelyard Blues wrote: If I could find the parts ......................... http://willys-overland.com/Hickey/hotrodL134.pdf   Micah

   Thanks for the post from Hot Rod about early "hop up" equip. Always had a strong interest in early speed equip. Another good read from Hot Rod mag. is 1967 Hot rod annual. First article is about Jeeps hill climbing and drag racing at Pismo Beach Calif. pretty amusing story about "Rat Patrol", which was a new show back then.....wonder if those guys or off spring are still around? There's a pic in the article of a relatively stock CJ2A with home made header and 2 carb set-up similar the one you showed. In the same book is Bonneville 1967 with great pic's and write up about Burt Munro(worlds fastest Indian) Warner Rileys 160mph stock Harley Sporster. There's also an article of step by step SBC rebuild guide......The book was like my "bible" growing up. I'd really like to have this conversation around the campfire tipping a few brewski's with all you guys that posted on this thread. Joe W

I was thinking more of GI mods.

But looking at the history of the 134, No one can beat the mods by Roos in 1939. not bad for a 1926 engine with orig 30 hp.


http://www.fourwheeler.com/features/1408-the-willys-go-devil-engine-jeep-encyclopedia/

Job one for Roos was to redo the anemic Willys four and do it on a budget. The Willys four had appeared in the 1926 Whippet, which was the company’s first economy car, albeit an upscale one. It displaced 134.2 ci, just like the later Go-Devil, but only made 30 hp. By the late ‘30s, the Willys four was making 48 hp with a few upgrades, but it had become notoriously unreliable and was well under the market’s power curve.

Roos’ reliability benchmark was 100 hours at full power. One of his first tasks was to strap the 48hp engine to a dyno. It lasted 22 hours at 3,400 rpm—’nuff said. Roos and his staff set to modernizing the engine, incorporating insert bearings, a fully counterbalanced crankshaft, aluminum pistons, a fully pressurized lubrication system, and a revised valvetrain. In just a few months, the new engine was ready for the dyno. It exceeded 100 hours at over 60 hp at a whopping 4,400 rpm. Success! The new engine was dubbed Go-Devil and first appeared in some of the 1939 Willys cars rated at 61 hp at 3600 rpm. In 1940, when the stylish new Willys 440 (4-cylinder, 1940) models appeared, they were all powered by the Go-Devil, as were the ’41 441 and ’42 442.

willys54wagon wrote: modified after the war for 68HP? These engines featured a 7:1 compression ratio, uprated intake system and were rated for 68 hp and 109 lb-ft of torque—the highest stock ratings t

       I was just about to post the same question you asked. I'll take that extra 8 H.P. I know about the head, what about the intake upgrade they mention? I 've heard the ford model T 4 banger got a significant H.P. increase by increasing the size of intake valves. It wasn't simply putting overhead intakes in the F head as Luzon red said for the very significant increase but diameter of the valve also. So any body know the limits of intake valve size on the L head engine? Maybe I'm just getting old but I find a mild hop-up on a stock engine peferable to a engine swap. Joe W

I was to young at the time to know anything about any other clubs save the ones in the local area. I do know Jeep Clubs were a BIG thing in the 60's with guys like my dad pulling junker jeeps out of fields and getting them back on the road and trails.

wadoyado wrote: ...In the same book is Bonneville 1967 with great pic's and write up about Burt Munro(worlds fastest Indian)...

Have you ever seen the movie "The World's Fastest Indian"?  It starred Anthony Hopkins and it was pretty good. 

http://https://www.imdb.com/title/tt0412080/?ref_=fn_al_tt_1

your shop manual stops at the start of the engine specifications. SO that kind of screws it as a reference.

But the reason the Car engine has 8 more HP then the Jeep engine is simple compression ratio. They also ran a Vacuum advance distributor (not that that would increase HP but if does improve mileage and drivability)

LuzonRed47 wrote: Too bad W-O was so cheap and didn't design an all-new OHV engine with 5 main bearings, but that would have been revolutionary in 1949.

They did! (not sure on main brg. Count). Later they chopped 2 cylinders off the 230-6 Tornado, and had a sweet OHC, crossflow head 4 cylinder, never went into production!    I'm guessing the V-6 made more sense!.

Lee

there is a parts list at this site

http://www.henryjcars.com/hjc77/jimb/jims.html