NickVyse

Name this mystery inlet valve

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Jesus, no sooner did I think I was ready to assemble my engine when...

 

One inlet valve has a chromed stem that's warn through right where the valve-stem seal fits. I thought it was a stainless valve from Ireland engineering and bought one whilst the head was away with the valves being machined. It's not.

 

Now I might just go ahead and use it and accept a bit of blue smoke on the over run, but would prefer to just find the manufacturer and buy one new one. It has the code CA2017e stamped on them, but nothing on google and with the usual suppliers. 

 

They're 46mm inlets with am 8mm stem, as per stock. But they have a tapered and chromed stem, and are very light at 84.9gms

In comparison a new stainless valve and the original stock valves weigh about 94gms. It also looks like they have a slightly different angle on the seat. 

 

Last pic is side by side with a new stainless valve on the left.

 

IMG_6834.thumb.jpg.b2be151f6a276377732bba555ac101bb.jpg

 

IMG_6835.thumb.jpg.92c5f8e0759a711b0a2bc4a7e0cf3093.jpg

 

IMG_6836.thumb.jpg.c174476b173715f7a66b4eada18465dd.jpg

 

IMG_6837.thumb.jpg.68399aef33036e63b20c1b5f3d7aad97.jpg

 

IMG_6838.thumb.jpg.abe227bf8e0c652d214bcc0c1dc2bb94.jpg

 

IMG_6839.jpg.bd53364aeb8c3f560bfe5d0c5741d998.jpg

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not the best digital callipers in the world, but roughly 7.9mm if I measure on worn spots both sides of the valve. what are you thinking?

Edited by NickVyse

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I was just curious about how severe the wear was, since you mentioned possibly reusing it.

 

I don't think well with metric dimensions... but that translates to .004", which seems like a lot.

 

Thank you for the information.

 

Tom

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1 hour ago, NickVyse said:

not the best digital callipers in the world, but roughly 7.9mm if I measure on worn spots both sides of the valve. what are you thinking?

 

Suggest measuring at a point of no wear, and compare to the wear location. At half a thou (0.0005") of taper, I won't install used valves unless I have them surfaced and custom-fit to new guides. Some folks will go to one thousandth taper, and some more...

 

At first I thought it might be one of the custom valves* I use, but the shape is different (*same or lighter than the one you have).

 

Good luck. -KB

valves.jpg

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I'm sure it's not a great idea to run with the valve as is. It's a surface coating that's been worn away, whatever that coating is (chrome-like, but have no idea). And it has a lip between the wear and the rest of the stem. At the same time this is a quick refresh of a cheap old engine, but I'm trying to the right thing :-)

 

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I'd bin it-

the other thing is that the edge of the failing chrome will

wear the guide, as it'll be sharp.

 

t

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