modelengineer
Lord of the noise
Or you can have each V in phase (both cyl's in the V get TDC at the same time) and just have 4 chambers.
v8 2 stroke build
- Thread starter dan
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yer could do that but to make it out of one crank i would need 8 genals and it would be fairly long
modelengineer
Lord of the noise
well, you don't need a journal between each throw. There are some 4 cylinder engines which only have 3 main journals; one at each end and one in the middle.
I think the supercharged idea is the best.
I think the supercharged idea is the best.
yer it would be
Orange Krate
Active member
I've had all these ideas before. The whole topic makes me tired. Please, someone else do it so I don't ever actually try it!
If I did, I would probably start by modding these parts.
http://www.nvbackflow.com/engines/pricelist.htm
http://www.nvbackflow.com/engines/
If I did, I would probably start by modding these parts.
http://www.nvbackflow.com/engines/pricelist.htm
http://www.nvbackflow.com/engines/
TurtleMann14
Insane plan member
in a v arrangement you can't have both pistons reach tdc at the same time...
it's mechanically impossible
unless you make a two stoke with head and valves i think your going to have to have a blower of sorts
(and then don't forget to have a high pressure release in case she decides to burn in the case)
and your exhaust port timing will have to be shorter from normal 2T if its charged
it's mechanically impossible
unless you make a two stoke with head and valves i think your going to have to have a blower of sorts
(and then don't forget to have a high pressure release in case she decides to burn in the case)
and your exhaust port timing will have to be shorter from normal 2T if its charged
Orange Krate
Active member
In going through my old notebooks looking for my belt tensioner transmission idea, I found a sketch of my supercharged, 2cycle 2stroke idea from way back also. Looks like I wanted reed valves in the head below the carbs? What's supposed to keep all the oil in the crankcase on compression? 
I had no idea about 2 strokes(still don't) Still, it's fun to revisit old ideas.
I had no idea about 2 strokes(still don't) Still, it's fun to revisit old ideas.
Russ2251
AZUSA:Powered by LAWN-BOY
No oil sump in 2 cycle engines, hence no oil loss.
Gas is mixed with oil and, as such, internals are constantly lubed.
Gas is mixed with oil and, as such, internals are constantly lubed.
frederic
The Junk Man
Two strokes generally make twice the power of equal-sized four strokes, simply because they fire each cylinder twice as often. Sounds plausable to me.
Making one may or may not be difficult depending on the machining skills you have as well as machines you have access too.
Machining the block out of a solid chunk of aluminum, steel or iron will be fairly expensive which is why these parts are cast by the OEMs to a reasonable shape at which time they just machine things as precisely as they can, or need.
Another option is to build your engine as an assembly - the crankcase is one piece, the cylinders bolt on, and the heads bolt onto that.
You could also tig-weld several two-cylinder blocks together to make as many cylinders as you want. I've personally done something along those lines by making an adapter that went between two Buick V6 engines, I joined the crankshafts externally rather than weld the blocks together.
Lots of ways to do this.
Making one may or may not be difficult depending on the machining skills you have as well as machines you have access too.
Machining the block out of a solid chunk of aluminum, steel or iron will be fairly expensive which is why these parts are cast by the OEMs to a reasonable shape at which time they just machine things as precisely as they can, or need.
Another option is to build your engine as an assembly - the crankcase is one piece, the cylinders bolt on, and the heads bolt onto that.
You could also tig-weld several two-cylinder blocks together to make as many cylinders as you want. I've personally done something along those lines by making an adapter that went between two Buick V6 engines, I joined the crankshafts externally rather than weld the blocks together.
Lots of ways to do this.
Orange Krate
Active member
That much I know. I was going for a gasoline Detroit because I was opposed to mixing 2cyl oil. Now supercharging the crankcase with 2cyl fuel makes more sense.
Thedude
New member
Thats gonna be sweet!
modelengineer
Lord of the noise
You can have them at tdc at the same time. The banks would have to be slightly staggered to account for the pistons being on different crankpins, but it is completely possible.
TurtleMann14
Insane plan member
crank pins = crank journals?
no, you are supposed to have the banks point directly at the center axis of the crank or it will put more load on the piston
you can have two cylinders on the same bank be at tdc at the same time, but not the same journal
no, you are supposed to have the banks point directly at the center axis of the crank or it will put more load on the piston
you can have two cylinders on the same bank be at tdc at the same time, but not the same journal
KartRacer695
KartRacer695
how about just buy 8 cr500 engines and slap em together, no offence, but i think ur bitting of more than you can chew.
modelengineer
Lord of the noise
Yes.
I understand that, that's not what I meant. Staggered front to back, keeping inline with the crank axis, so as to enable them to be on different crank pins.
Yes, that's what I said
TurtleMann14
Insane plan member
but what we are going for is two pistons in the same journal to be at tdc so that air is properly drawn in the crank case and then compressed up into the cylinder.
so unless it has two crankshafts tied together, or a valved head, i think he would be better off with an inline engine
so unless it has two crankshafts tied together, or a valved head, i think he would be better off with an inline engine
Kaptain Krunch
Pro Junk Collector
Straight 8 2 stroke would be sweet. 8 tuned pipes would take up so much room!
TurtleMann14
Insane plan member
^agreed a lot of room, it would look sick though
Kaptain Krunch
Pro Junk Collector
Forget the looks, it would SOUND sick. You ever heard a nice piped twin or triple sled idling? imagine that times 4...
TurtleMann14
Insane plan member
mmmmm i wonder what it would sound like....
she would scream that is for sure
she would scream that is for sure
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