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Mad Mart
 Post subject: Sprint Piston
PostPosted: Mon Apr 02, 2018 2:08 pm 
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What size is this Sprint piston?

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dollyman
 Post subject: Re: Sprint Piston
PostPosted: Mon Apr 02, 2018 5:55 pm 
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Look's like standard to me :?:

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xvivalve
 Post subject: Re: Sprint Piston
PostPosted: Mon Apr 02, 2018 6:34 pm 
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It says Std, but at 90.28 is it 20 thou (of a mm) undersized ??? One to measure I think!
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Mad Mart
 Post subject: Re: Sprint Piston
PostPosted: Mon Apr 02, 2018 7:41 pm 
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It says Std, but at 90.28 is it 20 thou (of a mm) undersized ??? One to measure I think!
I was thinking it is std but looking at the figure below (0.02). It won't be 20 thou of a mm. though. It is 90.28mm. across the skirt of the piston.

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Engines, Gearboxes, Overdrives etc. rebuilt. PM me.


1997 TVR Chimaera 450


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MIG Wielder
 Post subject: Re: Sprint Piston
PostPosted: Mon Apr 02, 2018 9:46 pm 
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Hi Mart, You probably know most of this already, but page 12-5 of the Sprint Workshop Manual gives the various dimensions of the Sprint standard pistons. And the piston lower skirt dimension is given as 90.277mm to 90.290mm for Grade "G"std . So that agrees with what you have measured as 90.28mm. A STD size grade G piston.
As to what the 020 number refers to ... sorry I don't know.
My initial thought it was a mixed metric ( 90.28mm) and imperial measurement (+0.020 thou ) ???

Tony.
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tony g
 Post subject: Re: Sprint Piston
PostPosted: Mon Apr 02, 2018 11:21 pm 
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I would say the 90.28 is the skirt size and the bore clearance is the 0.02mm (not thou), so needs a bore of 90.3mm which is standard

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Mad Mart
 Post subject: Re: Sprint Piston
PostPosted: Mon Apr 02, 2018 11:28 pm 
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Thanks guys. Yes Tony G, that makes sense. Ah! well, off to the M/C shop tomorrow.

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Sprintless for the first time in 35+ years. :boggle2: ... Still Sprintless.

Engines, Gearboxes, Overdrives etc. rebuilt. PM me.


1997 TVR Chimaera 450


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tony g
 Post subject: Re: Sprint Piston
PostPosted: Tue Apr 03, 2018 12:55 pm 
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What brand are they Mart?

Tony

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