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Oil Field Engines & Related Equipment

Titusville Iron Works J C Engine Help


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  #1  
Old 12-14-2008, 09:15:20 PM
machinels machinels is offline
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Default Titusville Iron Works J C Engine Help

Please tell me how to set piston position, in relation to transfer ports on a J C engine
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  #2  
Old 12-15-2008, 01:56:10 AM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: J C Engine Help

I assume that you are talking about a 2 cycle engine (assuming sometimes has consequences not for this forum). With the piston at BDC, the top edge of the piston head(combustion end), nearest to the cylinder wall should be just at the bottom edge of the transfer port. This does not mean the deflector (if your engine has one) If the engine is piston port intake, the inlet port should be completely opened by the bottom of the piston at TDC. These are optimum settings. Sometimes machining was not perfect - then a balance had to be acheived to get the engine to run well. If the engine has poppet or disc valve intake, then only the transfer port setting is important.
Andrew
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Old 12-15-2008, 10:07:04 AM
machinels machinels is offline
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Default Re: J C Engine Help

Andrew, thanks on the help, but I need know if you take the head off and look at the piston, I need to no if the piston turned correctly in the bore. I no the rod sould have a mark on it for the top dead center of piston, but my rod is scared in this area. The piston has two lugs on it. I think go on either side of intake ports. Let me know Larry
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Old 12-15-2008, 04:29:15 PM
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Zach Williams Zach Williams is offline
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Default Re: Titusville Iron Works J C Engine Help

I believe that you set the half moon on the piston opposite of the exhaust ports, at least that is what I remember, I could be wrong, it's been a while.
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Old 12-15-2008, 06:57:53 PM
Steve NW Ohio Steve NW Ohio is offline
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Default Re: Titusville Iron Works J C Engine Help

The "half-moon" deflecting surface of the piston surface is lined up with the exhaust port on my "JC" (McKinney) 2 cycle engine.
I did this on the recommendation of a old pumper based on:
That surface was intended to direct the exhaust gas towards the exhaust port in advance of the incoming fuel mixture being introduced to the cylinder cavity. It seemed to work well on that engine and I used the same positioning of the piston when restoring my Spang engine as well.
When looking at the air turbulence during the travel action of the piston the placement of that angular surface (in this manner) creates a "draw" effect and theothretically amplifies the inrush of the new fuel mixture.
This is more critical when actual power is required compared to how we (in the hobby) only run for show purposes. What I did find was that the postion of the top edge of the piston in relationship to the intake port had considerable more effect on ease of starting and repeatable operating characteristics then piston rotation. My 1.5 cents worth on the subject.
[everything is now worth less then it once was]
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Old 12-15-2008, 08:20:07 PM
Frank Stenger Frank Stenger is offline
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Default Re: Titusville Iron Works J C Engine Help

I'm no world authority on this, but the piston deflector for
my M&H Sheffield halfbreed is like I show in the attached
sketch. I guess I would say that it is next to the intake
port, but a picture is worth... etc, etc...
This is how the engine was set up when I got it - and there
was also a punch mark on the piston rod top to indicate this.
When I had the head off, I could turn the engine over with
the intake system in action. If you stood a couple of feet
in front of the cylinder head opening, you could feel the blast
of intake air as it was deflected along the cylinder wall toward
the head end. My read is that this inrush of fresh charge
fills the cylinder and - at the same time - helps scavenge
the exhaust gas out the exhaust port. Simple two-strokes
lose some good fuel-air mix doing it this way, but they run
well at a some loss in efficiency.
The big high-efficiency diesels use a blower to scavenge
the cylinder and fill it with fresh air. Then, near TDC the
injectors blast in the fuel at no loss out the exhaust.
Such engines can be "super" efficient!

Frank Stenger
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Old 12-15-2008, 10:16:42 PM
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Ray Ethridge Ray Ethridge is offline
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The deflector on my National Transit 2 stroke piston is oriented the same as Frank shows in his sketch.
Ray Ethridge
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