| Author |
Message |
    
curtis
Member
Username: curtis
Post Number: 9
Registered: 04-2003
| | Posted on Thursday, March 19, 2009 - 04:46 pm: | 
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This is the piston and wrist pin from 1901 Truscott I am restoring. The engine has very little wear and good compression. I have not seen this arrangement before. I was wondering if anyone was familiar with this. It has four (4) rings they are tapered with a thick side opposite the cut which is at 45 degree angle. The last ring fits into a notch in the wrist pin and holds the pin in.
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bartropr
Advanced Member
Username: bartropr
Post Number: 37
Registered: 06-2006
| | Posted on Friday, March 20, 2009 - 10:57 am: |
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I have had rings for engines made by a engineer here in the UK. He is able to reproduce some of the features you mention, but the different thickness may have been down to the quality of the cast iron and the requirement to ensure the ring had an even "springiness".
What size of engine is this - approx bore and stroke/horsepower? |
curtis
Member
Username: curtis
Post Number: 10
Registered: 04-2003
| | Posted on Tuesday, March 24, 2009 - 06:53 pm: |
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The bore of this engine is 4.5" and the stroke is 5". The Welch brothers designed this engine and used it in the early cars 1901 - 1903. They claimed it made 20 hp I think is a bit high as it doesnt spin very fast, maybe 700 RPM max. |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 437
Registered: 07-2002
| | Posted on Tuesday, March 24, 2009 - 09:03 pm: |
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The elliptical rings were common as were the 45 degree and stepped ends. If compression was good you can reuse them. Conventional rings will work fine if you need to replace them. The ring across the pin contains it and also scrapes oil and leads it to the pin. |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 438
Registered: 07-2002
| | Posted on Tuesday, March 24, 2009 - 09:04 pm: |
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Forgot to mention, the engine is a beauty. |
richardday
Senior Member
Username: richardday
Post Number: 726
Registered: 11-2003
| | Posted on Wednesday, March 25, 2009 - 10:01 am: |
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Too often the tendency is to replace perfectly good rings. Seems to me if the engine has good compression and you get good bounce prudence is to leave them alone. The eliptical rings seem to work very well without excessive wall pressure making a two stroke engine to stiff too start easily. The engine is a beauty. |
