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Old 30 Apr 2016, 18:35 (Ref:3637379)   #1
Adam43
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Omega Piston Rings

I'm rebuilding a B-series engine (1950cc) I needed a new set of Omega Piston Rings (for 83.5mm Omega pistons, #3649). I ordered these from http://www.shengineering.co.uk. However it turns out the oil control rings are too big - I understand that they changed from 3mm to 4mm at some point and mine need the older 3mm ring. All the other rings in the set I bought are OK.
Contacting Omega hasn't helped.

Does anyone have any idea if there may be any places that stock the older rings?
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Old 30 Apr 2016, 18:50 (Ref:3637385)   #2
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Originally Posted by Adam43 View Post
I'm rebuilding a B-series engine (1950cc) I needed a new set of Omega Piston Rings (for 83.5mm Omega pistons, #3649). I ordered these from http://www.shengineering.co.uk. However it turns out the oil control rings are too big - I understand that they changed from 3mm to 4mm at some point and mine need the older 3mm ring. All the other rings in the set I bought are OK.
Contacting Omega hasn't helped.

Does anyone have any idea if there may be any places that stock the older rings?
The other alternative Adam would be to find a real engineer, with a real lathe (a rarity in these days of CNC machine shops) who can open up the ring grooves in the piston accurately to suit the new style rings.
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Old 30 Apr 2016, 19:14 (Ref:3637394)   #3
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Real engineering - I like that not least because they will be suitable going forward if (when) I need to do it again.
I was going to have new pistons, but they cleaned up very well and I've had them coated. Bought new pins and rings, I thought jobs a good'n.

I'm hoping for an easy solution. not least as I'd like it completed!
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Old 1 May 2016, 08:41 (Ref:3637467)   #4
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83.5 mm is a common Ford crossflow , Bda / lotus twincam size . It may be worth a look on a Ford/ Lotus website to compare sizes . Burtons, QED, etc. Altenative may be looking for a ring manufacturer listing ",Deves" and "Hastings" are ring manufacturers, also seem to remember possibly a company in Bradford, can't remember name though (Bradford piston rings?)!

Good Luck

Last edited by oneofapair; 1 May 2016 at 08:46. Reason: additional info
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Old 1 May 2016, 14:22 (Ref:3637543)   #5
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Thanks, I'll give them all a call next week.
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Old 2 May 2016, 20:15 (Ref:3637938)   #6
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What did SH Engineering say? Have found Dave pretty helpful.

Have a look for peugeot 205/309 1.9 GTI rings, they were 83mm so 0.5mm oversize rings would work if they are 3mm, which I think they are.

FW Thorntons should do them.
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