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Slant 6 Motorcycle
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Author:  Baron [ Mon Sep 13, 2004 1:09 am ]
Post subject:  Slant 6 Motorcycle
I'm new here and i own a 67 dart with a 225 that i replaced about 2 years ago. ive made several cars from the ground up and now I have decided to try to make a motorcycle from the original motor thats still sitting in my garage.
I also want to make all the styling in matte black / black rubber sprayon bed liner/ and billett alumium
going for that brushed look instead of having any chrome.

i was also thinking about putting an airbag spring on the swingarm tail and having the normal ride position be at full inflation, then when i park i could let out all the air and drop it to the frame and with an engine that wide i wouldnt need a kick stand!

and ive been very influenced by THIS:
http://www.smoon-kits.com/FFVII/har...dydaytona29.jpg http://gkworld.zoovy.com/product/GKW00242 http://www.megalixir.net/hardydaytona.html

last night i spent from about 10pm - 4am tearing apart my engine, the prognosis? a little grim.

one piston has a hole in it. nothing else is structuarly wrong, just a hole. weird. so thats getting replaced, wich means all pistons get replaced, along with the valves, and the rockers and pushrods are missing, so those will be new too!

other parts that are not existant yet:

intake manifold. i want dual carbs, probobly going to have a custom manifold made so that the carbs can sit on either side of the gas tank.

exaust manifold, i need to get a stocky so that i can get the engine running before i start on the frame of the bike, i plan on making (dual)custom headers in the end.

everything electrical. plugs, wires, distrubutor, EVERYTHING

fuel pump/ filter. im replacing the mech. pump with NOTHING because the gas tank is on top of the engine. bikes dont need em. but i will have an in-line filter pre-carb.

what do you guys think? got any advice?
Author:  argentina-slantsixer [ Mon Sep 13, 2004 5:12 am ]
Post subject: 
Here's my cent: get a GOOD reinforced helmet :lol:
Author:  GuyLR [ Mon Sep 13, 2004 6:37 am ]
Post subject: 
Ok I'm lightin' up the flame thrower. I Can't think of a worse motor to try to put in a motorcycle than a Slant. Boats, motorhomes, stationary power rigs, water pumps, sawmills, submarines (Submarines?), fine. Please not a Slant Motorcycle, a trike maybe but not a motorcycle. Your talent is needed for other things in this world besides putting a 45 year old engine into an unrideable vehicle.
Author:  Eric W [ Mon Sep 13, 2004 9:21 am ]
Post subject: 
Why not? BossHoss makes motorcycles with 350ci or 502ci Chevy engines...may as well do it right and use a slant! 8)
Author:  De Soto Frank [ Mon Sep 13, 2004 11:04 am ]
Post subject: 
Well, "balance" of the machine, for one thing...

are you planning to orient the engine on the long axis of the bike or transverse?

If you're going "inline", I'd suggest an engine with a vertical orientation.

Back in the '40s or '50s, someone built a bike that was running out on the salt flats of the Soutwest that had a Plymouth flat-head six....

Are you going to try and outdo the Road-Dog ?
Author:  sixinthehead [ Mon Sep 13, 2004 2:05 pm ]
Post subject: 
"Plymouth motorcycle";
http://www.allpar.com/history/plymouth/motorcycle.html
(300 mph? I don't think so :shock: )

I was thinking balance problems, too. Ever put a Slant on an engine stand at the "installed angle" of 30 deg? Likely it didn't stay up for long...
Author:  De Soto Frank [ Mon Sep 13, 2004 2:45 pm ]
Post subject: 
So, old Fred "broke a connecting rod at 180 MPH and he wasn't even out of second gear" ? :shock: :shock: :shock:

I wonder what the final drive ratio on that bike was? The rear end ratio of a stock Plymouth that Fred's engine & tranny came from was around 4.3:1...

That must've been something...180 MPH on a bike, in 1935...must've seemed like "the speed of light" !
Author:  Jeb [ Mon Sep 13, 2004 5:34 pm ]
Post subject: 
Want to be different, build a motorcycle that will kick everyones ass. A motorcycle powered by a 331 HEMI. That will make the Chevy guys run for cover when they hear it coming.

Something a little more practical. Try a Slant six powered lawnmower or go-cart.
Author:  Baron [ Mon Sep 13, 2004 10:22 pm ]
Post subject: 
well first off i'm making it out of the slant 6 because I ALREADY OWN THE SLANT6

inline? thats crazy, of course its going to be transverse and the engine will slant forward, AWAY from my knees, exaust pipes crawling under my feet, everything else in between. in fact at night people will be able to see the spark inside my clear distributor cap as i buzz down the road.

and I've met and hungout with the guys from boss hogs, i rode a bike with a lincoln flathead V8, i don't need that much power.

lets see, i own an EXTRA 225, i want to make a motorcycle, why not make something original and unique? and if the engine does NOT workout i can always drop a crate V-Twin! so why would i not at least try?

and i dont intdon'tor gearing it up for ridiculous speeds, i just intend on cruising around and being able to perhaps drive it to a few bike rallys and such, so a top speed of 100-120 will be way more than enough.

and i am taking my stripped block and head to the shop tomorrow to get it baked n cleaned, it will come back with new valves installed and im pretty i'mre i want to shave the head .060, what are the best pistons to get? i want some with valve depressions in them.

right now the toughest challenge i see ahead is trying to find a dual carb manifold that keeps everything close to the block but the carbs wide apart from the centerline of the bike, im certian this does not exist and i will use a stock manifold, or something close. God only knows i cant afford to get a custom intake manifold made.

and i am definatly going to get a set of dutra duals for this puppy, is seems like they were made for me :D

so does anyone have any HELPFUL advice?
do i need to make some diagrams of my plans so far?
or all we all on the same page now?
Author:  GTS225 [ Tue Sep 14, 2004 3:30 am ]
Post subject: 
Good God, man!!! A slant is, like, 38 inches long, and you plan on mounting it crosswise? In addition, you're going to have to have guards at both ends for the flywheel and water pumps belts.

What are you gonna do for a drive system? The only reasonable way I can see is a jack-shaft arrangement to get the rotational force back to the centerline of the chassis, and then you're gonna have an awfully long belt of chain final drive.

I see no reason that you can't fabricate your own intake as you describe. It's just a couple steel plates and some tubing welded together.

Still, I suggest you seriously consider a trike arrangement.

Roger
Author:  kesteb [ Tue Sep 14, 2004 4:16 pm ]
Post subject: 
I think somebody has watched to many "Monster Garage" shows. But then Jesse did make a trike out of that diesel 6.
Author:  HyperValiant [ Tue Sep 14, 2004 6:20 pm ]
Post subject: 
What about:
radiator?
fan?
oil pan sump?
the fact that you wont be able to lean into a turn without scrubbing one end or the other?
Im not trying to pee on your parade as I would love for you prove me wrong and I also love the uniquness of the whole idea but having built many cars myself ,I have learned the importance of reality.
HyperValiant
Author:  Baron [ Tue Sep 14, 2004 11:30 pm ]
Post subject: 
a friend of mine was telling me i could make an intake manifold also, im not sure how exactly i would want it but basicly i want the carbs at outside rear corner, meaning behind cyl's 1 and 6.

and the fan is going to be dual electric with auto thermostat, like a honda.
they will be affixed behind the radiator and im going to make a cowl out of fiberglass to cover the gaps between the radiator and the block and frame
i should have plenty of room.. im planning a 45deg rake

and turning too sharp? im going to try to keep the bike a little off the ground to allow for the width of the block but i also plan on installing skid plates on steel arms made from the same tubing (type not size) as the frame for protection. also the ride height will be adjustible on the fly.

and look, i appreciate any criticism, but do not try to discourage me from even trying, ive spent 7 years building and modifiying cars and now i want to build a motorcycle. if i fail, its a learning experiance, if i succeed, yay. either way its worth it to me. and i can always drop my working engine in some other project and put a "regular" engine and drivetrain in the bike. so nothing is a loss. unless i kill myself, but thats a risk im willing to take (lol)


(edit) oh crap, i forgot about the oil pan i was thinking i would have to modify an existing oil pan to be symetrical left to right on the bike, and then adding baffles against acceleration and cornering, if i can fit an oilpan in.. then im sure this can be done, i do know a bit about oil pan internal efficiency, and this dosent seem hard. i wish someone who knows about this could back me up....
Author:  HyperValiant [ Wed Sep 15, 2004 5:40 pm ]
Post subject: 
OK, Ill offer an idea on the oil pan.Bild a custom oil pan that will clear the reciprocating assembley,the plug the port for the original pickup and tube,then drill and tap into the side of the block tapping into the original galley from the outside and then use an external oil tank with another pump to get the oil from the pan back to the tank,or use a dry sump pump.
(DISCLAIMER:Im not a doctor nor do I play one on TV and I didnt spend the night in a HolidayInn Express last night).
HyperValiant
Author:  Kermit Lucas [ Wed Sep 15, 2004 10:11 pm ]
Post subject: 
Why not build a dune buggy type thingy? A slant 6 bike will be unridable, except maybe down the 1/4 mile track. I ride bikes and own a Dodge 6, I can't ever see them as one.
Seems a crossflow head engine will be lots better for fitting everything in a bicycle frame. And, use the dry sump.
I saw a bike last weekend with a GM 'Quad-four' engine installed. Wild-looking thing, but probably won't outrun a V-Max.

Good luck.
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