Uh, oh. I'm using four ring pistons. Is that why I'm getting such good oil
milage (2000 mi/qt)? My rebuild was two years ago, I hope these are not the
same pistons. Did your four ring pistons have split skirts?
Bob Donahue (Still stuck in the '50s)
Email - bobmgtd@insightbb.com
52 MGTD - NEMGTR #11470
71 MGB - NAMGBR #7-3336
----- Original Message -----
From: "Bullwinkle" <yd3@nvc.net>
To: <mg-t@autox.team.net>
Sent: Thursday, August 28, 2003 7:29 PM
Subject: Re: TF rear axle ratios/GPS/Cruising speed
> Bob:
>
> Back when I was participating in NEMGTR marathons we experienced very
> high bore wear one year when using four ring pistons. The engine needed
> a 0.020" overbore in about 6,000 miles of high speed driving. I
> attribute the excessive wear to the use of the 4 ring pistons from a
> major supplier which had two oil control rings. The engine was sleeved
> back to standard and three ring forged pistons used. I've experience no
> problems yet in the 40,000 miles since then. That's probably due to the
> better metallurgy in the sleeves and the use of the three ring pistons.
>
> Blake
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