I need help...BAD. Please, mechanical emergency

Peter123

Peter123

C-Note
Location
Houston, TX
X2 RAGS said:
this is a joke right?
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Ignorant, maybe; joke, no.

I (obviously) don't know that much about engines, but my thought was that if the valve was stuck almost closed and when the piston was dropping it closed the valve and caused enough of a vacuum that a weak starter might not be able to overcome. And when the plug was pulled, there would not be a vacuum created. In retrospect, I can see that if the starter has enough power to compress, it would most likely have enough power to overcome a vacuum like that.

I guess I was completely wrong, and now I've learned something. Kind of what this forum is about I thought. :smile:
 
Scraggly

Scraggly

Location
hhh
Peter123 said:
Ignorant, maybe; joke, no.

I (obviously) don't know that much about engines, but my thought was that if the valve was stuck almost closed and when the piston was dropping it closed the valve and caused enough of a vacuum that a weak starter might not be able to overcome. And when the plug was pulled, there would not be a vacuum created. In retrospect, I can see that if the starter has enough power to compress, it would most likely have enough power to overcome a vacuum like that.

I guess I was completely wrong, and now I've learned something. Kind of what this forum is about I thought. :smile:
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i wasnt trying to be a dick or anything man, it just that we all pretty much stick to 2 strokes here. so no valves. i just though you where joking. my bad

two-stroke-parts.gif


4_stroke_trunk_piston_engine_access2.htm_txt_4_STROKE_X_SECTION.gif


here is the basic idea.
 
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Peter123

Peter123

C-Note
Location
Houston, TX
ROFLMAO!!!

A LOT more ignorant than I thought.

I never realized that 2-strokes didn't have valves!!! I knew that they, obviously, had 2 less piston strokes which gives it more power, but I didn't know about the lack of valves.

I guess the complete lack of valve covers on my 701 should have been a major clue...

BTW, I never thought you were being a d$%k, I just wanted to clarify that I didn't understand why I was so far off.

Thanks for he info.
 
Peter123

Peter123

C-Note
Location
Houston, TX
Sorry for the threadjack, but I have a question.

With the intake port and exhaust port not having any valves to regulate the flow, how does the engine keep from pulling in half exhaust and half fuel on each stroke?
 
Conquistador

Conquistador

B-Saw
Location
Virginia Beach, VA
There are reed valves, they just don't operate like "traditional" valves that you were referring too. They are basically just flaps that open when air travels in one direction across them and close when it goes the other way. I think I explained this correctly. :ugh2:
 
Peter123

Peter123

C-Note
Location
Houston, TX
Ok, once again excuse my ignorance, but I thought the reed valves were only on the intake side, which wouldn't keep exhaust from being sucked back in. Am I not correct about this as well?
 
WFO Speedracer

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
The waves in the exhaust create a scavenging effect which helps to pull out the exhaust,of course some exhaust is recycled but the majority goes out the tailpipe
e where it belongs.I believe the proper name is the "Schnuerle loop scavenging system .This may help you somewhat,look under loop scavanged.

http://en.wikipedia.org/wiki/Two-stroke_cycle
 
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SXRguyinMA

SXRguyinMA

Life's a beach
Location
Leicester MA
chasingdaylight said:
haa.. i like your avatar every talks all this hype on stroking a motor and you de-stroke one..:laugh2: you just need smaller domes.. water ingestion sucks
but you avatar is great:thinkerg:
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yea as far as the de-stroker I just like being different. Everyone wants bigger stroke? Well SCREW THAT! I'm going smaller :barrel: :laugh2:

ran into some issues with the bend in the rod hitting the crank weights though :hitwithrock: gotta get out the dremel and grind it down a tad :fingersx:
 
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