Hi people, took the head off my mini today as it need re-drilling around the thermostat housing. I decided to clean the pistons off, and stamped on the top ring of the pistons ar + .03 in the center of the pistons it has stamped
TRW-175-9799-1
JGO.03
The pistons are dished as its a 1275. Anyone know what pistons they are?
Thanks
Piston Help
Started by
dan-russell
, Feb 22 2010 01:03 PM
13 replies to this topic
#2
Guess-Works.com
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Posted 22 February 2010 - 01:12 PM
don't know what the pistons are, but they are 30 thou oversize
#3
dan-russell
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Mini Mad
Posted 22 February 2010 - 01:13 PM
presuming its had i rebore then, any idea what it would roughly be to and how to cheak?
Thanks
Thanks
#4
Ethel
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Posted 22 February 2010 - 01:19 PM
what is it, 998 1275?
#6
Guess-Works.com
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Posted 22 February 2010 - 01:56 PM
A series I assume, rather than A+, not many A+'s would have been bored to +30, most +20... but very common in A series. It's a standard overbore size.
#7
dan-russell
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Mini Mad
Posted 22 February 2010 - 03:31 PM
A series I assume, rather than A+, not many A+'s would have been bored to +30, most +20... but very common in A series. It's a standard overbore size.
yep its an a series. Does it mean its no longer a 1275?
Thanks
#8
samsfern
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Posted 22 February 2010 - 03:36 PM
itl now be something like 1303 cc, if +0.020" is 1293
#9
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#10
dan-russell
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Posted 22 February 2010 - 08:20 PM
You dont happen to know were i can get some piston rings for them from do you?
Thanks
Thanks
#12
Cooperman
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Posted 23 February 2010 - 03:40 PM
You should try Thorntons of Shrewsbury (F.W. Thornton Ltd). You may have to measure the ring widths and depths and get aftermarket ones. I had some original Rover pistons for which none of the usual Mini parts suppliers could provide a ring set, but Thorntons supplied a set made by Hastings, an excellent U.S.A. based company for a very sensible price.
#13
dan-russell
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Mini Mad
Posted 25 February 2010 - 02:28 PM
You should try Thorntons of Shrewsbury (F.W. Thornton Ltd). You may have to measure the ring widths and depths and get aftermarket ones. I had some original Rover pistons for which none of the usual Mini parts suppliers could provide a ring set, but Thorntons supplied a set made by Hastings, an excellent U.S.A. based company for a very sensible price.
Hi all, right i've found out they are TRW piston but cant seem to find them on the internet. I also think they are an american company. but as i say i cant find nothing!
#14
navyboy55
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Posted 13 February 2019 - 12:54 PM
Hi I have a new mini with 1275 A+ per code on block and we just put new aluminum head on it with 1.5 roller tips. The pistons are stamped TRW-175-9797-1 JGO.03 can some one tell me what size this motor is now?
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