LDO Posted February 10, 2011 Posted February 10, 2011 I saw this: and thought it was wild. Turns out it really got built, but details are hard to find. I'd like to build a model inspired by this sketch, but I do not like Harley Davidson engines. Would it be possible to have a pair of inline-4s side-by-side driving 4 steamroller rear tires? Could it be done with a push button shifter, and split the signal so it goes to both transmissions? Just wondering how it could be modeled realistically. Thanks. Lee
Chuck Most Posted February 10, 2011 Posted February 10, 2011 I've seen something similar done, I believe a slipper clutch was used. I'll have to do some digging and see if I can find some reference pics.
wisdonm Posted February 10, 2011 Posted February 10, 2011 You could use a Powertec V 8type of set-up.
Modelmartin Posted February 10, 2011 Posted February 10, 2011 You could use some sort of coupler between the crankshafts. That is what twin engine dragsters did. The cranks would be inline.
crazyjim Posted February 10, 2011 Posted February 10, 2011 Check out Ma's Resin for "steamroller" tires from way, way back.
LDO Posted February 10, 2011 Author Posted February 10, 2011 You could use a Powertec V 8type of set-up. I've seen that, and it's wild. What I'm after is two inlines side by side, just for the visual impact.
LDO Posted February 10, 2011 Author Posted February 10, 2011 (edited) You could use some sort of coupler between the crankshafts. That is what twin engine dragsters did. The cranks would be inline. Would there just be one transmission? BTW I have to go to work so I can't check back in for another 11-12 hours. I'm a plumber and there's still a backlog of calls for broken pipes in Austin...a week after the big freeze. It's like this at every plumbing company in town, and all the plumbing supply houses are running low on parts. I can't wait 'til we get caught up. Edited February 10, 2011 by LDO
lonewolf01 Posted February 10, 2011 Posted February 10, 2011 check out truck and tractor pullers.they sometimes run engines inline or side by side using one trans set up
Guest Johnny Posted February 10, 2011 Posted February 10, 2011 (edited) Better be a great engine tuner! Had a racing cart back in the 60's that ran two 10 hp Mccullough chainsaw engines! Direct independent drive though! If one engine failed to come up to power she would get pretty squirlly on ya! We had to remove one of the tuned headers and run a pipe to restrict one of the engines to keep them close! The guy doing the tuning kept shortening the pipe until he got the engines as close as possible! As has been said, look into pulling tractors or twin engine dragsters! Edited February 10, 2011 by Johnny
old-hermit Posted February 11, 2011 Posted February 11, 2011 Would it be possible to have a pair of inline-4s side-by-side driving 4 steamroller rear tires? The easiest way would be to use two Honda 750 cc 4's and swap the chain output gear on one to the opposite side. That way the drive chains would be between the inner & outer tires (or both chains in the center). A mechanical or electric shift linkage could be fabbed up to work both trannys. Approximately 70 hp (stock) per engine would be adequate to turn the steam rollers. An easier way would be to eliminate one tranny and use a shaft between the engines with the drive sprocket in the center. Hope that makes sense.
jas1957 Posted February 11, 2011 Posted February 11, 2011 I know somewhere I read about running 2 engines side by side. They had one engine turning the opposite way ( reverse cam & oil pump ). Used some kind of gear setup at the back that linked them & then into the same trans. I don't know if it worked well or not but bet it was wild to hear & watch.
MikeMc Posted February 11, 2011 Posted February 11, 2011 Yes you can run a dual engine MC. Growing up in Wisconsin riding Harleys the BIG ENEMY of all was T C Christenson and the Hogslayer twin engine top fuel NORTON,,,Read all about how he did the design ,,the slipper clutch from a dozer...yep http://www.motorcyclemuseum.org/halloffame/detail.aspx?RacerID=374 As to the Harley or not...I sure would not want to sit behind a wide eight cylinder...muchless twin Harleys. Power needed? I run a S&S 107" V twin with a mild tune 110 HP 114 ft lbs @ the rear wheel. I run a single 240mm Metzler with a six speed and can lay rubber as long as I can afford tires. So be Unique..CBX 6 cylinder..gives you your look, one transmission..use a jackshaft to center the sprocket..
Chuck Most Posted February 11, 2011 Posted February 11, 2011 The setup I menioned earlier wouldn't be what you want- it had two engines meshed at the crank, and a slipper clutch ONLY- no transmission at all.
seeker589 Posted February 13, 2011 Posted February 13, 2011 Yup - It can be done! What's the best thing - It doesn't HAVE to work - it just has to look like it works! You could make it powered by a dylithium reactor through a plasma power transfer transmission with a constantly variable coupler made of unobtainium. I love modeling! Yes you could mesh two motorcycle engines or any other engines for that matter. I used to hang with tractor pullers and had many conversations with a few of those with engines hooked crank-to-crank. Meshing the motors together isn't much of a problem - all you have tot do is clock the cranks so both number one cyls are firing at the same time - eveything else just works out. Coupling also helps eliminate some harmonics. Coupler strength is very important when the motors are making 500-1500HP. Ive seen things like modified flywheels and fabricated couplers. Many tracktor pullers are machinists and outstanding backyard fabricators.
diymirage Posted February 13, 2011 Posted February 13, 2011 back home we had this thing called "plaggencross" its kinda like a circle track demolition derby but instead of a track it would be raced on a cornfield, after the harvest but before the plowing so all the stumps were still there there was this one team from belgium that ran iether a 2CV or a bug (cant remember) with a hayabusa engine on each wheel they were synchronised but not attached
samdiego Posted February 13, 2011 Posted February 13, 2011 Yup - It can be done! What's the best thing - It doesn't HAVE to work - it just has to look like it works! You could make it powered by a dylithium reactor through a plasma power transfer transmission with a constantly variable coupler made of unobtainium. Kids these days. When I was young we did it all with Kryptonite and Flubber
Aaronw Posted February 13, 2011 Posted February 13, 2011 Several WW2 tanks used paired engines, the British Matilda used a pair of AEC diesel bus engines, the Soviet T-70 light tank and SU-76 SP gun used twin GAZ truck engines. The US M5 Stuart and M24 Chaffee light tanks both ran a pair of Cadillac V-8s with Hydramatic automatic transmissions. I'm not sure how the power from the two engines was "coupled" but, I do know they came together before sending the power to the tracks. I also recall reading that the two US tanks were less troublesome since the slip in the automatic transmissions helped balance out minor power differences between the engines.
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now