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850 Pistons (again)

Posted: Sun Apr 12, 2015 7:35 am
by gs.davies
On my quest for a set of 850 Pistons that don't cost the earth I've turned up these. Does anyone know anything about them?

"I can supply you with 848cc pistons @ any size:

STD
+20
+30
+40
+60

The pistons are original fitment, 5 ring type, dished top, pinch bolt fit, 8.3:1 or 9.1:1 compression ratio versions."

I have asked for part numbers but I was unaware that there was a 9.1:1 850 piston..

Re: 850 Pistons (again)

Posted: Sun Apr 12, 2015 8:57 am
by 251 ENG
Who is the manufacturer of these ?

Re: 850 Pistons (again)

Posted: Sun Apr 12, 2015 9:12 am
by Spider
I have a couple of suppliers for new after market 850 pistons, only 4 ring types though and in all the standard oversizes up to +0.060", however they are listed as 8.3:1 types.

I've also just looked across a variety of factory info (Metro and ST) re: the 9.1's and I can't find any reference to them. These do have me curious.

Re: 850 Pistons (again)

Posted: Sun Apr 12, 2015 9:22 am
by Gareth Brandt
8.9:1 for 8AH engine.......is this the automatic?

Re: 850 Pistons (again)

Posted: Sun Apr 12, 2015 9:45 am
by Spider
Gareth Brandt wrote:8.9:1 for 8AH engine.......is this the automatic?
Yes it is. I didn't think of looking there, we never had 850 Auto's here, only 998's.

Could be the higher comp pistons though.

Re: 850 Pistons (again)

Posted: Sun Apr 12, 2015 11:20 am
by Macker2
Are they something like these County Pistons that I got from Paul at Engine Tekniks in Westhoughton.

viewtopic.php?f=3&t=11989

I have them in my 850 but haven't fired it up yet.
Macker

Re: 850 Pistons (again)

Posted: Sun Apr 12, 2015 6:05 pm
by gs.davies
I've asked for the part numbers - I already have 15037s at plus 40 in it. They're all showing stress fractures around the pin though.

It's either these which are on offer at a great price (compared to how much they're usually going for) or I build an 1100 and have some proper fun!

Re: 850 Pistons (again)

Posted: Tue May 05, 2015 10:44 am
by nick rogers
After discussions at Blyton, I wanted to let folks know that I have several sets of 15037's at different oversize. I will sort them out and photograph them and stick them on the For Sale section.