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#1
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engine problem
Ok, I am not sure what is causing this, maybe someone will know. I rebuilt a
1600 single port and went through and adjusted the valves. Everything lined up correctly (valve wise) starting at #1 at tdc. When I crank the motor instead of it sucking in air it blows out of the carb. Did I some how put the cam in wrong? I can not picture it being in wrong if I can get all the valves in the correct positions at tdc of each cylinder. Any clues? |
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#2
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george taylor wrote:
> Ok, I am not sure what is causing this, maybe someone will know. I rebuilt a > 1600 single port and went through and adjusted the valves. Everything lined > up correctly (valve wise) starting at #1 at tdc. When I crank the motor > instead of it sucking in air it blows out of the carb. Did I some how put > the cam in wrong? I can not picture it being in wrong if I can get all the > valves in the correct positions at tdc of each cylinder. Any clues? > > Assuming you did get the cam marks lined up, there is not just ONE TDC for each cylinder, but in fact TWO. Take #1 cyl as an example. The first time that the pulley mark comes around, #1 piston is at its high point and the exhaust valve is open to let the burned gases out. The NEXT complete revolution of the pulley brings the mark up again, but this time #1 piston is completing the compression stroke and both Intake and Exhaust valves must be closed. Go thru it again. Focus on #1 valves. Turn the pulley and watch for the #1 rockers to "back off" at TDC. This would be the correct TDC to adjust #1 valves. Hard to explain; hope that was clear. -- Speedy Jim http://www.nls.net/mp/volks/ |
#3
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Thanks. I did notice that there were 2 point that were at tdc, so I rotated
it to the point that both valves were closed. I will try it again. I just can not se that if both valves are in the closed position, and the piston is at the top of the cycle that it would push out air. Thanks again. "Speedy Jim" > wrote in message ... > george taylor wrote: > >> Ok, I am not sure what is causing this, maybe someone will know. I >> rebuilt a 1600 single port and went through and adjusted the valves. >> Everything lined up correctly (valve wise) starting at #1 at tdc. When I >> crank the motor instead of it sucking in air it blows out of the carb. >> Did I some how put the cam in wrong? I can not picture it being in wrong >> if I can get all the valves in the correct positions at tdc of each >> cylinder. Any clues? > Assuming you did get the cam marks lined up, > there is not just ONE TDC for each cylinder, but in fact TWO. > > Take #1 cyl as an example. > The first time that the pulley mark comes around, > #1 piston is at its high point and the exhaust valve > is open to let the burned gases out. > > The NEXT complete revolution of the pulley brings > the mark up again, but this time #1 piston is > completing the compression stroke and both Intake and Exhaust > valves must be closed. > > Go thru it again. Focus on #1 valves. Turn the pulley > and watch for the #1 rockers to "back off" at TDC. > This would be the correct TDC to adjust #1 valves. > > Hard to explain; hope that was clear. > > -- > > Speedy Jim > http://www.nls.net/mp/volks/ |
#4
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"Speedy Jim" > schreef in bericht ... > george taylor wrote: > >> Ok, I am not sure what is causing this, maybe someone will know. I >> rebuilt a 1600 single port and went through and adjusted the valves. >> Everything lined up correctly (valve wise) starting at #1 at tdc. When I >> crank the motor instead of it sucking in air it blows out of the carb. >> Did I some how put the cam in wrong? I can not picture it being in wrong >> if I can get all the valves in the correct positions at tdc of each >> cylinder. Any clues? > Assuming you did get the cam marks lined up, > there is not just ONE TDC for each cylinder, but in fact TWO. > > Take #1 cyl as an example. > The first time that the pulley mark comes around, > #1 piston is at its high point and the exhaust valve > is open to let the burned gases out. > > The NEXT complete revolution of the pulley brings > the mark up again, but this time #1 piston is > completing the compression stroke and both Intake and Exhaust > valves must be closed. > > Go thru it again. Focus on #1 valves. Turn the pulley > and watch for the #1 rockers to "back off" at TDC. > This would be the correct TDC to adjust #1 valves. > > Hard to explain; hope that was clear. > > -- > > Speedy Jim > http://www.nls.net/mp/volks/ So if i understand this correct there are 2 TDC positions? As a novice i'm told to also line up the dizzy at the right mark(cyl 1), does that automaticly set up the right TDC? just wondering, Roger |
#5
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bug '59 wrote:
<SNIP> > So if i understand this correct there are 2 TDC positions? > As a novice i'm told to also line up the dizzy at the right mark(cyl 1), > does that automaticly set up the right TDC? > > just wondering, > Roger > > > That's no guarantee. If the dizzy drive gear is put in wrong, the dizzy can just be turned or plug wires swapped around. You have to follow the motion of the valves to determine whether TDC is an exhaust stroke or a compression/firing stroke. -- Speedy Jim http://www.nls.net/mp/volks/ |
#6
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"Speedy Jim" > schreef in bericht ... > bug '59 wrote: > > <SNIP> >> So if i understand this correct there are 2 TDC positions? >> As a novice i'm told to also line up the dizzy at the right mark(cyl 1), >> does that automaticly set up the right TDC? >> >> just wondering, >> Roger >> >> >> That's no guarantee. If the dizzy drive gear is put in wrong, > the dizzy can just be turned or plug wires swapped around. > > You have to follow the motion of the valves to determine > whether TDC is an exhaust stroke or a compression/firing stroke. > > -- > > Speedy Jim > http://www.nls.net/mp/volks/ Interesting info, could make a huge difference on my "hesitation" problem posted earlier. Won't find that one in the books (at least not the one i have) Thanks Roger |
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