The rings are +0.030 in with ring gaps as follows:
- Top 0.008" - 0.016"
- Second 0.012" - 0.020"
- Oil 0.010" -0.020"
The top ring appears to be coated steel and the second ring cast iron, which must explain the min. gap difference.
The rings currently gap in the bores at the very lowest values for each ring, No apparent variation in bore diameter top and bottom or ovalling. I'm confident in the measurements and don't want to add tolerance for possible measuring error.
I'd like to simply fit them as they are but would probably be happier adding one or two thou just for peace of mind, particularly as 8 thou is only 2.4 thou per inch of bore, but not sure if this is necessary. I won't be racing the car but would like to know there is some reserve if I do push the engine a bit. QED advise that anything within the stated tolerances is fine - but would be more confident if anybody here could verify this from their experience?
- First Gear
- Posts: 22
- Joined: 26 Sep 2009
- Location: London
I cannot see how stoning another couple of thou. would be a problem if it makes you feel better.
BTW I found it much easier, whilst fitting the bottom ring, to fit the internal spring first then gently stretching the ring over it.
- Fourth Gear
- Posts: 561
- Joined: 12 Jan 2015
- Location: amersham
No problem whatsoever, stagger the ring gaps keep toward the sides. Make sure there is no step for the top ring to touch.
- Third Gear
- Posts: 455
- Joined: 14 Sep 2013
- Location: south coast uk
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