Topic: Venolia piston info

[Yoshimatic]

Does anybody know what compression ratio this venolia piston is please? It is 65mm and has 237 cast in the underside of the piston. Also is this piston cast or forged?
It looks cast as the 237 is cast on it but just checking.

[BPellerine]

look like maybe 12.1,they should be forged not cast.bill

[Yoshimatic]

Thanks very much for that Bill, much appreciated. Mick

[calj737]

From looking at the top picture, theres a good deal of porosity in that piston which would make me think its cast, not forged. Forging generally yields far less porosity as a byproduct of the pressure. I could be wrong with my observation though...

[754]

Naw just not clean, i dont think Venolia ever had cast..show a pic of tge side of it, looks like an early piston or the type MTC used.

[calj737]

Naw just not clean, i dont think Venolia ever had cast..

Then I stand corrected.

[PeWe]

The tops look like almost these pistons. MTC ... look like cast
http://www.ebay.com/itm/1970-70-HONDA-CB750K0-CB-750-K0-CYLINDER-and-pistons-/162238337434?_trksid=p2141725.m3641.l6368

[sohc boy]

forged

[Bill/BentON Racing]

RC sold those 836cc kit, 10.5 and 12.5 CR. I got a  set somewhere,  forged, Bill

[754]

I thought that at first, but my RC pistons had some side cutting around piston pin, these dont..but could be an early version.

[Medyo Bastos]

i have a nos ring set for rc 836 

[Yoshimatic]

i have a nos ring set for rc 836 

How much would you want for the set of rings please? Are the rc rings the same width as the Venolia rings?

[754]

Put me next in line..

[Medyo Bastos]

50 plus shipping


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[Yoshimatic]

50 plus shipping


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Yes please, I will take them thanks. Will need the shipping cost and can pay the total in one hit. Thanks mate.

[Yoshimatic]

Thanks very much to everyone for the help. Very much appreciated.

[754]

Depending on wear, you may have to bore another cylinder, and fit to these pistons..

[Medyo Bastos]

Depending on wear, you may have to bore another cylinder, and fit to these pistons..

Yes, I was thinking the same thing


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[754]

Better check ring width before sending them off..

[PeWe]

The cylinder and 836 pistons looked as a good buy, but I have 2 good sets of 836 and a working cylinder. + new rings during shipping. Said to fit ART 836 as printed in my old Action Fours. My 2 sets of RC and 1 Action fours have same type of rings. Except my cast RC that had 1-piece oil rings. 3-piece oil rings from RC forged matched.

Same seller as the 836 shipped a valve cover old style to me, will be here today. Look like an old RC style cover with welded nuts for 8 bolts keeping cam holders in place.

[754]

The Mtc kit, one piston had the lines wore ofc near skirt..looks like heavy wear..
But easy to bore to 850 cc.