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Engine wear quantification


Wb123
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To cut a long story short adding 3cc to my v5 will get me a higher milage rate at work to the tune of about £500 a year. I don't want to change the car as its pretty frugal on fuel and parts plus has done all its depreciating already.

At 110,000 miles I suspect it has already worn an extra 3cc by itself, and an old friend who is a qualified engineer is happy to write a letter supporting the case if I can help find some published evidence to back the argument up that the expected wear by this point would be at least 3cc.

So far all I can find is that engine performance doesn't suffer until at least 0.2% increase in bore diameter, and we only need 0.1% to gain the 3cc. It does use a little oil but frankly not enough to argue it has started burning oil.

 

Has anyone got any inclination of where they might have read something that could help?

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11 hours ago, London Best said:

Never heard such a ridiculous idea in a lifetime of motoring. Grow up!

Can’t really disagree with that. Even a rebore is not deemed to increase capacity for insurance purposes. 
 

if you have time on your hands, look up the maximum bore wear (before rebore/replacement) and calculate the swept volume from that. As far as I know, no manufacturer specifies wear as a percentage. Or you could get on with life.

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6 hours ago, SpringDon said:

if you have time on your hands, look up the maximum bore wear (before rebore/replacement) and calculate the swept volume from that. As far as I know, no manufacturer specifies wear as a percentage. Or you could get on with life.

Oh even better forget the idea completely!

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