Wb123 Posted November 10, 2020 Report Share Posted November 10, 2020 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? Quote Link to comment Share on other sites More sharing options...
Dunkield Posted November 10, 2020 Report Share Posted November 10, 2020 I would struggle to believe you could pull up anything convincing just using maths, I think swept volume is what you are looking at measuring, not sure how you could do that without dismantling it? Quote Link to comment Share on other sites More sharing options...
Wb123 Posted November 10, 2020 Author Report Share Posted November 10, 2020 If there is any data to be found on accepted rates of cylinder liner wear per hour of use or mileage that would probably suffice. Or even something suggesting most petrol engines would start seeing wear beyond standard tolerance by a certain mileage. Quote Link to comment Share on other sites More sharing options...
figgy Posted November 10, 2020 Report Share Posted November 10, 2020 I think it's down to what manufacturers state on production. Quote Link to comment Share on other sites More sharing options...
Gordon R Posted November 10, 2020 Report Share Posted November 10, 2020 Even if you could prove the cc had increased by way of wear, I can't see any company accepting it and paying a higher rate of mileage allowance. They will work on the manufacturers original spec. Quote Link to comment Share on other sites More sharing options...
GingerCat Posted November 11, 2020 Report Share Posted November 11, 2020 18 hours ago, Gordon R said: Even if you could prove the cc had increased by way of wear, I can't see any company accepting it and paying a higher rate of mileage allowance. They will work on the manufacturers original spec. Agreed. Worth a try. Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted November 11, 2020 Report Share Posted November 11, 2020 Watching this one with interest! Quote Link to comment Share on other sites More sharing options...
Centrepin Posted November 11, 2020 Report Share Posted November 11, 2020 I read it because it had a big word in it. Quote Link to comment Share on other sites More sharing options...
AVB Posted November 11, 2020 Report Share Posted November 11, 2020 I recon you have two hopes and Bob’s dead. Quote Link to comment Share on other sites More sharing options...
mellors Posted November 11, 2020 Report Share Posted November 11, 2020 🤔. Would like to here the office comments when that goes in. Think it'll be a definite NO.!!! Quote Link to comment Share on other sites More sharing options...
rbrowning2 Posted November 11, 2020 Report Share Posted November 11, 2020 I think if the engine is worn by an extra 3cc it is knackered and very unlikely to pass an mot on emissions given all the blue smoke that would be coming out of the exhaust. Quote Link to comment Share on other sites More sharing options...
bornfree Posted November 11, 2020 Report Share Posted November 11, 2020 At 110,000 a modern engine won't even be worn by 0.03cc Quote Link to comment Share on other sites More sharing options...
London Best Posted November 11, 2020 Report Share Posted November 11, 2020 Never heard such a ridiculous idea in a lifetime of motoring. Grow up! Quote Link to comment Share on other sites More sharing options...
Centrepin Posted November 12, 2020 Report Share Posted November 12, 2020 10 hours ago, London Best said: Never heard such a ridiculous idea in a lifetime of motoring. Grow up! Absolutely spot on. 🤣🤣🤣🤣🤣 Quote Link to comment Share on other sites More sharing options...
SpringDon Posted November 12, 2020 Report Share Posted November 12, 2020 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. Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted November 12, 2020 Report Share Posted November 12, 2020 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! Quote Link to comment Share on other sites More sharing options...
dead eye alan Posted November 12, 2020 Report Share Posted November 12, 2020 20 hours ago, bornfree said: At 110,000 a modern engine won't even be worn by 0.03cc Spot on I have recond modern engines with over 300000 miles that have negligible wear. Quote Link to comment Share on other sites More sharing options...
figgy Posted November 13, 2020 Report Share Posted November 13, 2020 The things some people dream up to click a few quid more. Quote Link to comment Share on other sites More sharing options...
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