The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: Sprint Piston Size?
PostPosted: Fri Jul 19, 2019 8:44 pm 
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TDC West Mids Area Organiser
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Joined: Thu Sep 28, 2006 1:13 pm
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My understanding is the bore of a standard Sprint engine is 90.3 mm.

A piston that measures 89.69 mm at the crown, and 90.25 mm at the skirt, is therefore a standard piston...is it not?


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 Post subject: Re: Sprint Piston Size?
PostPosted: Sat Jul 20, 2019 2:50 am 
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Yes, that is correct.


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 Post subject: Re: Sprint Piston Size?
PostPosted: Sat Jul 20, 2019 11:37 pm 
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Thanks Geoff, I thought so. They were sold to me as +20'


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 Post subject: Re: Sprint Piston Size?
PostPosted: Wed Aug 07, 2019 7:44 pm 
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An oversize piston should have a stamping on the crown which indicates the size.


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