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my friend asks a question
John,
Here is a question for you and your metalhead group. Q: Say you had a 2 CYCLE motorcycle and you wanted to push start it. Suppose that you got on it and turned on the ignition but didn't hit the start button. Instead you depressed the clutch lever and put it in 1st gear. Then four of your not so bright friends, two on each side, pushed you and the bike BACKWARDS!! Remember there are two each side so they should be able to keep you from falling over. After the bike gains some momentum you pop the clutch. Now, the question is: WILL THE BIKE START WITH THE ENGINE RUNNINGBACKWARDS??!? If not, why not? The reason that it comes up is that I read about a new class of ULCCs (UltraLargeCrudeCarriers -- Way big mutha oil tankers) that have 2 cycle diesel engines with NO transmission, clutch or reduction gears of any sort. The drive shaft comes out the back of the engine and goes out the back of the hull and the propeller is bolted directly to the end of it No gears, no clutch, no nothing. The way that they reverse it is by shutting of the engine and then restarting it BACKWARDS!!?! It is designed to do this, I'm wondering if all 2 cycle engines will run backwards or not? Inquiring minds want to know. Bill From Engineman |
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my friend asks a question
On Sat, 29 Oct 2011 18:22:51 -0700 (PDT), "
> wrote: >John, > > Here is a question for you and your metalhead group. > > Q: Say you had a 2 CYCLE motorcycle and you wanted to push start >it. Suppose that you got on it and turned on the ignition but didn't >hit the start button. Instead you depressed the clutch lever and put >it in 1st gear. Then four of your not so bright friends, two on each >side, pushed you and the bike BACKWARDS!! Remember there are two each >side so they should be able to keep you from falling over. After the >bike gains some momentum you pop the clutch. Now, the question is: >WILL THE BIKE START WITH THE ENGINE RUNNINGBACKWARDS??!? If not, why >not? The reason that it comes up is that I read about a new class of >ULCCs (UltraLargeCrudeCarriers -- Way big mutha oil tankers) that >have 2 cycle diesel engines with NO transmission, clutch or reduction >gears of any sort. The drive shaft comes out the back of the engine >and goes out the back of the hull and the propeller is bolted directly >to the end of it No gears, no clutch, no nothing. The way that they >reverse it is by shutting of the engine and then restarting it >BACKWARDS!!?! It is designed to do this, I'm wondering if all 2 >cycle engines will run backwards or not? Inquiring minds want to >know. > > Bill > >From Engineman This is just a GUESS on my part. The big difference I see is that a 2cycle motorcycle engine is designed to run at med to high speeds so I'm guessing it's designed for single direction running. I'm thinking it also has reed valves and port valves and those might not work backwards. The Oil Barge Engine, on the other hand, is surely designed to run at very low speeds, possibly as low as 200 rpm and no faster then perhaps 800 rpm. I suspect it uses valves similar to a typical car engine too. So I can imagine it might be fairly easy to design one that runs in either direction. |
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my friend asks a question
Ashton Crusher > wrote:
> >This is just a GUESS on my part. The big difference I see is that a >2cycle motorcycle engine is designed to run at med to high speeds so >I'm guessing it's designed for single direction running. I'm thinking >it also has reed valves and port valves and those might not work >backwards. I know that the 2-cycle Briggs and Stratton on my old lawnmower would start backwards because once I mis-assembled the pull cord assembly and managed to do it. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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my friend asks a question
I didn't know Briggs & Stratton ever built any 2 cycle engines.
cuhulin |
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my friend asks a question
On Sat, 29 Oct 2011 18:22:51 -0700 (PDT), "
> wrote: >John, > > Here is a question for you and your metalhead group. > > Q: Say you had a 2 CYCLE motorcycle and you wanted to push start >it. Suppose that you got on it and turned on the ignition but didn't >hit the start button. Instead you depressed the clutch lever and put >it in 1st gear. Then four of your not so bright friends, two on each >side, pushed you and the bike BACKWARDS!! Remember there are two each >side so they should be able to keep you from falling over. After the >bike gains some momentum you pop the clutch. Now, the question is: >WILL THE BIKE START WITH THE ENGINE RUNNINGBACKWARDS??!? If not, why I would guess that it woudl start. >not? I have a motorcycle, that I fixed and ran for 5 minutes, but haven't been able to work on more. I certainly havne't adjusted the timing. If the spark timing is like a car, set BEFORE TDC, then running it backwards would have the timing after TDC. That would make the engine a lot less powerful, But if all you neede r everse was to back into a parking place, it might still do it It wouldn't run for long and wouldn't waste that much gas. Maybe there are other reasons a moto wouldn't run well in reverse. The reason that it comes up is that I read about a new class of >ULCCs (UltraLargeCrudeCarriers -- Way big mutha oil tankers) that >have 2 cycle diesel engines with NO transmission, clutch or reduction >gears of any sort. The drive shaft comes out the back of the engine >and goes out the back of the hull and the propeller is bolted directly >to the end of it No gears, no clutch, no nothing. The way that they No nothing? No adjustment for the spark timing, to make it BTDC, even though the entine is runing backwards? >reverse it is by shutting of the engine and then restarting it >BACKWARDS!!?! It is designed to do this, I'm wondering if all 2 >cycle engines will run backwards or not? Inquiring minds want to >know. > > Bill > >From Engineman |
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