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pigeon56
 Post subject: Pistons
PostPosted: Sat Jul 15, 2023 12:12 pm 
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Hi

My 1850 engine is being rebored but i need to find at set of pistons which are standard +20 thou.

Unfortunately the machine shop have told me that they are unable to rebore further to take a bigger size pistons due to the size of the liners.
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Mad Mart
 Post subject: Re: Pistons
PostPosted: Sat Jul 15, 2023 12:32 pm 
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Do you want new or used?

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pigeon56
 Post subject: Re: Pistons
PostPosted: Sun Jul 16, 2023 8:18 am 
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Hi

Prefer new but if i cannot get new would consider used.
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cleverusername
 Post subject: Re: Pistons
PostPosted: Thu Jul 20, 2023 5:05 pm 
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Are you sure they can't bore it any larger? I have had an 1850 block bored up to Sprint size. That is 87mm to 90.3mm, which is 3.3mm.

Now to be honest I don't really understand imperial measurements but I am pretty sure that is way over 20 thou.
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Mad Mart
 Post subject: Re: Pistons
PostPosted: Thu Jul 20, 2023 6:25 pm 
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I had the same thought. 0.020" is only just over 0.5mm.. They should easily be able to bore it to +0.040".

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

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


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xvivalve
 Post subject: Re: Pistons
PostPosted: Thu Jul 20, 2023 6:55 pm 
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The OP says it is a linered block, so it would be the residual wall thickness of the liners which dictates what they can and cannot do.
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Mad Mart
 Post subject: Re: Pistons
PostPosted: Fri Jul 21, 2023 9:44 am 
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Liners are fitted from the factory. They have a certain OD and ID. The ID is bored & honed to standard size and are able to be bored out to at least +.040" if not +0.060". Even if replacement liners have been fitted, the OD would still be the same as the originals.

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


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xvivalve
 Post subject: Re: Pistons
PostPosted: Fri Jul 21, 2023 10:37 am 
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I too thought that until recently Mart, particularly as liners are shown in the factory parts book, but those who know better contested this not too long ago…

https://forum.triumphdolomite.co.uk/vie ... rs#p327975
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Mad Mart
 Post subject: Re: Pistons
PostPosted: Fri Jul 21, 2023 4:37 pm 
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So is that just the 1850s? as I've never come across a Sprint block without liners. I had assumed the 1850s were the same.

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


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2Toledos
 Post subject: Re: Pistons
PostPosted: Fri Jul 21, 2023 8:27 pm 
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Quote:
Hi

My 1850 engine is being rebored but i need to find at set of pistons which are standard +20 thou.
Alas, I only have new Hepolite sets either side of that: Standard and +0.040". :roll:

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