[Healeys] 100 engine bore for sleeves

[Larry Varley]

Hi John, I'm also getting the pistons from JP, who do a semi dished plus 
0.060 oversize. So compression around 9.5 to 1. Large liners do protrude 
into the bore of the distributor drive tunnel, but Ill make up a tool to 
bore that back out easily enough. We all have the memories but it seems 
none of us remember the details when it comes to actual sizes! Not that 
I would imply that most Healey owners are reaching a certain age :)
Cheers
Larry

On 20/02/2014 3:41 PM, John Rowe wrote:
> Hi Larry
> I did this to my 100 some 12yrs ago. I had bought std bore flat top pistons
> from JP Pistons in Adelaide but due to misunderstanding with machinist who I
> understood said the bore was fine it later turned out not to be the case. A
> P/o had evidently experienced heavy oil consumption and had fitted Cords
> rings which have a detrimental effect on bore leaving it wavy.
> The machinist recommended re-sleeving rather than over-boring as that was
> cheaper than buying new pistons again as the liners were cheaper than
> pistons with the same amount of machining required.
> I understand he used liners from a Mazda diesel engine but from what model I
> don't know. They must be thicker than usual as I couldn't insert the
> distributor cog past the liner. This was easily fixed by machining the cog
> on a linishing machine.T his same problem also occurred on a fellow
> Queeensland club members engine but I understand they ground a bit of the
> liner away in the distributor tunnel.
> Either way both fixes were successful
> Regards
> John Rowe
> Qld Australia
> BN1 BT7
>
>
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