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| Author |
Message |
    
Mike Adams
| | Posted on Wednesday, February 05, 2003 - 02:34 pm: | 
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Hi,
I have a 1902 Thrall engine 2 cylinder, 2 cycle. The pistons have a rectangular window in the side,an actual hole through the skirt, between the upper and lower rings. Does this window face the intake ports for the intake charge? Mike |
Ernie
| | Posted on Wednesday, February 05, 2003 - 07:00 pm: |
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Mike,
The dam on the top of the piston (or notch) faces the intake port (transfer from the crankcase). The sloping side is the exhaust side. If you go by this the hole in the skirt will be correct.
Hope this helps
Ernie |
Mike Adams
| | Posted on Thursday, February 06, 2003 - 09:00 am: |
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Ernie,
I think my engine is what they call a three port 2 cycle. Both the intake and the exhaust are on the same side of the jug,so as long as the sloping side, or lowest part of the top of the piston is the exhaust side, I should be ok, right? Doing it this way, the cylinder is open to the exhaust port when the piston is all the way down, and when the piston is all the way up, the crankcase is open to the intake port. One more Question. Even though this is going to have a gas/oil mix for fuel, should I have a small amount of oil in the crankcase for the rod ends to run through? Mike |
Mike Adams
| | Posted on Thursday, February 06, 2003 - 09:13 am: |
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Ernie, If you want to see what the motor looks like, check the one and two cylinder gas inboards index, under the heading "2 cylinder Thrall 2 cycle early 1900's 11/23/00 07:33am". Mike |
Richard Day
| | Posted on Saturday, February 08, 2003 - 06:57 pm: |
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Mike do not add oil to the crankcase. They put a drain plug in the bottom of the crankcase so you can drain off excess oil, water and gasoline that may built up> Urge you read the TIPS section in the technical section before you wreck your engine. You have been warned!!! |
Mike Adams
| | Posted on Sunday, February 09, 2003 - 10:07 am: |
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Richard, Thanks for the advice. This Thrall engine has no drain plug in the bottom of the crankcase. The shop that did the babbit work suggested that I add oil to the crankcase, but your message makes more sense. Do you have any thoughts on my piston orientation, in regards to my Feb.6, reply to Ernie? He never got back to me. Mike |
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