Piston

Information relating to the Matchless G3 or AJS Model 16 350cc Heavyweight
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Piston

Postby bob121 » Thu Oct 04, 2018 5:37 pm

Removed top end on friends 1955 g3ls. The piston has a series of groves the length of the piston. I'm assuming this is for dragging extra oil up the bore. Can't find any information on it. Looks too good to be DIY. Can anyone shed any light on it.

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Re: Piston

Postby 1608 » Fri Oct 05, 2018 12:37 am

I've never seen vertical grooves in a piston skirt only the splits in a 'split skirt' piston. Theres usually more than enough oil delivered to the bore without the need for any modification. Interested to see if anyone else has an idea.

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Re: Piston

Postby bob121 » Fri Oct 05, 2018 11:57 am

Sorry, when I said the length, I didn't mean that they were vertical. There are 5 grooves running horizontally down the piston, below the rings.

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Re: Piston

Postby SPRIDDLER » Fri Oct 05, 2018 12:48 pm

bob121 wrote:Sorry, when I said the length, I didn't mean that they were vertical. There are 5 grooves running horizontally down the piston, below the rings.

I take it you mean they run horizontally around the piston, parallel to the rings. Could it once have been a wire wound piston, now missing the wire?

amc-wire-wound-piston.jpg
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Re: Piston

Postby spookefoote1956 » Fri Oct 05, 2018 4:32 pm

I had one like that in the matchless engine when I bought it.
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Re: Piston

Postby bob121 » Fri Oct 05, 2018 7:31 pm

Spaced further apart than in the picture. Probably 1/4 " apart. Grooves are almost wide enough to take a ring.

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