Piston Ring Question

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Model T Ford Forum: Forum 2015: Piston Ring Question
Top of pagePrevious messageNext messageBottom of page Link to this message  By Pat Kelly Montana on Thursday, November 26, 2015 - 08:51 pm:

I'm tearing down a spare motor to see what I got in a wonder deal. It's a 26-27 motor, standard bore size and the crank is standard dia. journals. It has iron pistons. From the pictures can you tell if the rings are stock Ford? The spring was behind the second compression ring. Haven't seen that before on a compression ring. PK





Top of pagePrevious messageNext messageBottom of page Link to this message  By Richard Gould, Folsom, CA on Thursday, November 26, 2015 - 08:56 pm:

Not original Ford rings. Those you have are pretty much standard type replacement rings you can buy today for the cast iron pistons.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Pat Kelly Montana on Thursday, November 26, 2015 - 09:08 pm:

Thanks Richard. Do you know what the spring steel ring does behind the compression ring? PK


Top of pagePrevious messageNext messageBottom of page Link to this message  By Roger Karlsson, southern Sweden on Friday, November 27, 2015 - 05:08 am:

It's an expander ring that increases the pressure on the ring so it seals better to the cylinder. Might increase wear, but was a low cost option to get more miles out of the engine without a full bore and piston job.

Here's a thread with picture of the same type of expanders sold as accessories: http://www.mtfca.com/discus/messages/506218/584620.html?1446831333


Top of pagePrevious messageNext messageBottom of page Link to this message  By Pat Kelly Montana on Friday, November 27, 2015 - 10:56 am:

Thanks Roger. PK


Top of pagePrevious messageNext messageBottom of page Link to this message  By keith g barrier Savannah Tn. on Friday, November 27, 2015 - 06:09 pm:

The expander ring you have I believe is to be used behind the oil control ring at the skirt. KGB


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