connecting 2 two stroke engines

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VoodooChild

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possibly, i was hoping somebody knew what i was talking about. Have any more info on the zenoah's?
 
dan

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Kaptain Krunch said:
If the engines are 180 off, it would be much smoother, and if my thinking is correct, they would wind out faster, do to the combustion of one engine helping the other through the compression/exhaust stroke.
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you would think so but it doesent work like that. while having them 180 apart would make it way smother it doesent proform at the best. so to have both engines fire at the same time wilst the pistons are going down u will have about 175% power compered to 1 engne having 100%. and whist the pistons are coming up you have dubble the mass and 75% more power to get them up. if you were to have them 180 apart you would only get the 100% because your still only pushing 1 piston down at a time. hope you understand that might not make sence
 
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dan said:
you would think so but it doesent work like that. while having them 180 apart would make it way smother it doesent proform at the best. so to have both engines fire at the same time wilst the pistons are going down u will have about 175% power compered to 1 engne having 100%. and whist the pistons are coming up you have dubble the mass and 75% more power to get them up. if you were to have them 180 apart you would only get the 100% because your still only pushing 1 piston down at a time. hope you understand that might not make sence
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Then why dont car engines fire all 4 (or 6, 8 etc) at the same time? How come most multi cylinder engines fire their cylinders at different times? it seems like if it were that easy to make twice the power, every engine would be like that.
 
freakboy

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so pretty much what your saying dan is most twin cyl engines arent running as they should because there 180 appart
 
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freakboy said:
so pretty much what your saying dan is most twin cyl engines arent running as they should because there 180 appart
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not at all what im saying is that to build a proformace 2 stroke engine it is better to have them 0* apart. what you are saying right is an engine that honda or a factory builds to go in to motorbikes or what ever. the resoning for that would be that having them 180 apart makes a heaps smother and balanced engine and they would be more reliable. you will find that most proformace engines theses days have a flat plane crank i.e. street bikes, most ferrari's. so yer i surpose its if your after a reliable engine or a proformance engine.
 
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dan said:
not at all what im saying is that to build a proformace 2 stroke engine it is better to have them 0* apart. what you are saying right is an engine that honda or a factory builds to go in to motorbikes or what ever. the resoning for that would be that having them 180 apart makes a heaps smother and balanced engine and they would be more reliable. you will find that most proformace engines theses days have a flat plane crank i.e. street bikes, most ferrari's. so yer i surpose its if your after a reliable engine or a proformance engine.
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I have a performance 750cc sled engine (blown up), it put out over 140hp stock, each cylinder fired at a different time.

Heres a crank from a ferarri V10
 
freakboy

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No thats not ours thats a 410 we had a 358 sprint motor and its still a 180 crank there two pistons down two up. what you were describin would be all four down then rotates then all four up.
 
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freakboy said:
No thats not ours thats a 410 we had a 358 sprint motor and its still a 180 crank there two pistons down two up. what you were describin would be all four down then rotates then all four up.
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oh ok then im sorry if thats what you thought i meant but say its a 4 cyl. #1 and 4 go together and 2 and 3 to up to down thats what i mean sorry for the confusion
 
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dan said:
oh ok then im sorry if thats what you thought i meant but say its a 4 cyl. #1 and 4 go together and 2 and 3 to up to down thats what i mean sorry for the confusion
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Exactly, so if you were to downsize that into a 2 cyl engine, #1 would be 180* off #2. Show me a twin cylinder engine with a flat plane crank AND the cam timing the same for both cylinders, and then ill shut up.
 
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Kaptain Krunch said:
Exactly, so if you were to downsize that into a 2 cyl engine, #1 would be 180* off #2. Show me a twin cylinder engine with a flat plane crank AND the cam timing the same for both cylinders, and then ill shut up.
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and on a 2 stroke no such thing as cam timming
 
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well sorry i cant find a pic of one but if you dont belive me. dont belive me then is all i have to say

theres a pick of one of my engines aswell thats my baby one

 
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See in theory a flat plane crank goin all the way accross would work but then the forces pushing on the crank would bend it like this in the middle ) and then it would snap
 
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