ORIGINAL: Argess

ORIGINAL: supertib



that engine is for show purposes only..it would be impossible for it to run... You cannot run a multi cylinder 2 stroke on a common crankcase...each cylinder needs to have its own sealed and separate crankcase

ORIGINAL: savagecommander


you talk the talk.
ever hear of offset pin crankshaft? both pistons move in sync, V config.


and who cares if its ''two separate engines'' you know how long boat guys have been running twins that are just two engines stuck together? they probably use gears to couple the engines. one roto, one clutch, works for me. im sure it has something to do with casting costs and not knowing how well the new design will work.


gotta get rid of that exh though. get a nice 2 into 1 header and run a tuned pipe.

ORIGINAL: savagecommander
gotta get rid of that exh though. get a nice 2 into 1 header and run a tuned pipe.

ORIGINAL: savagecommander



like this? this is impossible right? both cyl moving in sync. taken out of production because of complications of production.

you get kinda feisty when somebody pushes your buttons huh ha ha!!

ORIGINAL: Anthoop

A 2 into 1 header...on a 2 stroke?
Shared crankcase/exhaust+2 stroke=no. Can it be done, yes of course but will this improve power/efficiency....no it will reduce both.
The thread title is ''The Future of Offroad Engines'' therefore I expected to see things to improve upon what we already have not take a step back into the dark ages when we knew no better.
http://www.youtube.com/watch?v=fIG9pWldO8U

ORIGINAL: savagecommander



like this? this is impossible right? both cyl moving in sync. taken out of production because of complications of production.

you get kinda feisty when somebody pushes your buttons huh ha ha!!

ORIGINAL: savagecommander
care to explain?

ORIGINAL: Anthoop


Explain what exactly? How a 2 stroke engine works and how it uses the exhaust to increase power and efficiency?
If you are needing me to explain these things then in all honesty I really can not be bothered, hit Google up.

ORIGINAL: savagecommander

care to explain?

and super, if you look back at your post, you said ''You cannot run a multi cylinder 2 stroke on a common crankcase...each cylinder needs to have its own sealed and separate crankcase'' - then- '' a V-Twin is of course possible''


good of you to change your position.


and since we're all on topic now, id just like to say how much a water cooled ringed engine is an advancement to the hobby, and i cannot wait to see what the future holds!

ORIGINAL: Anthoop

4 strokes yes. Although the use of a single carburettor on a 2 stroke twin is not a huge problem, the use of a shared exhaust is.

As supertib pointed out, the above v-twin engine looks very pretty but is totally useless.

ORIGINAL: savagecommander
no, id like you to explain what i placed in bold letters of your post. if you know that it will decrease efficiency, do explain why. if you cant be ''bothered'' to back up your statement, then i dont think you should go around posting like you know what youre talking about.

I'd like to hear this one.....

ORIGINAL: srt10
sounds like some people need to use google.... [:-]

ORIGINAL: srt10

it's amazing to me what people behind a computer want to fight about!
fact is this will work... fact is some 2 stoke motors come with can mufflers and you know what, with the can mufflers, they work! [:-]
always someone who wants to say ''IT WONT WORK''

ORIGINAL: savagecommander

i think if you look at that picture closely you'll see that the pins are in fact 90* offset, which would allow synchronized movement of the pistons.

you never said in any of your posts that ''the sirio twin will not work'' - i believe i clearly pointed out your statements and i chose to contradict them, i didnt need to cut and paste.
''You cannot run a multi cylinder 2 stroke on a common crankcase...each cylinder needs to have its own sealed and separate crankcase'' your words- then, ''You cannot have a multi cylinder 2 stroke engine share a common crankcase unless both cylinders are 100% in sync and fire at the exact same time'' again, your words.

Its nice to think you mention that after its pointed out to you. My issue is FAR too may people on this forum take your word as gold, and i wasnt about to have you shut inquiring minds out of the possibility to understand that a 2 stroke v twin COULD........... work.

all you'd need is a synchronized crankshaft and a case volume large enough to support both cyl, and in the case of the siro .36, a case volume of about .54 cu inches, all other conditions met.

as far as the two to one discussion is concerned, if the exhaust pulses are 180* apart, then two cylinders can feed one pipe, with the pipe configuration altered to compensate for the additional exhaust volume. honda had a 499ci 2 stroke that fired all of its cyl in a 60 or 70* rotation, and used four pipes. made some 200HP but was undoubtedly EFI and later was phased out for 4 stroke.

ORIGINAL: srt10
it's amazing to me what people behind a computer want to fight about!
fact is this will work... fact is some 2 stoke motors come with can mufflers and you know what, with the can mufflers, they work! [:-]
always someone who wants to say ''IT WONT WORK''

ORIGINAL: savagecommander
as far as the two to one discussion is concerned, if the exhaust pulses are 180* apart, then two cylinders can feed one pipe, with the pipe configuration altered to compensate for the additional exhaust volume. honda had a 499ci 2 stroke that fired all of its cyl in a 60 or 70* rotation, and used four pipes. made some 200HP but was undoubtedly EFI and later was phased out for 4 stroke.

ORIGINAL: savagecommander
if the exh valves are opening 180* from eachother, cyl #1's exh resonance will bounce back before cyl#2 exh cycle begins ( or be so close to the port opennig there is no issue)
there is something mentioned about harmonic resonance in the pipe that has to be accounted for, but that is unclear in theory at best.