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| small bore 69mm bore? https://www.ausmini.com/forums/viewtopic.php?f=2&t=79719 |
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| Author: | mattsmadmini [ Sat Dec 29, 2012 8:03 pm ] |
| Post subject: | small bore 69mm bore? |
Is it possible? I know a 68mm imp piston small bore will give 1220cc what would 69mm give? http://www.turbominis.co.uk/forums/inde ... tid=506954[/i] |
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| Author: | drmini in aust [ Sat Dec 29, 2012 8:31 pm ] |
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1251.92cc. But beware, there are things to miss when boring this big, eg the oilway from pump to relief valve. I'd not put a huffer or hairdryer on either, the cylinder walls are really too thin. Why bother- these things were done when 1275 blocks were rocking horse dung, back in the 60s. Just come & buy a 1275 block. "There ain't no replacement for displacement", and.. "there's no substitute for cubic inches, except cubic money" 
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| Author: | mattsmadmini [ Sat Dec 29, 2012 8:58 pm ] |
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Oh kev my boy, I'd never consider it! Just found it an interesting thread whilst on turb minis huge bore with paper thin walls! Would be curious to see the rods and pistons... Cheers Doc |
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| Author: | KLAS [ Sat Dec 29, 2012 11:35 pm ] |
| Post subject: | |
after reading this on turbominis, i tried to find out what pistons they are. seems to be the Ford Valencia engine, 68.7mm diameter, 53.9mm long, 18mm pin diameter and 29.4mm compression height. so it is about 4mm shorter than the Mini 998 piston, IIRC |
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| Author: | 68Rusty [ Sun Dec 30, 2012 11:35 am ] |
| Post subject: | |
drmini in aust wrote: 1251.92cc.
But beware, there are things to miss when boring this big, eg the oilway from pump to relief valve. I'd not put a huffer or hairdryer on either, the cylinder walls are really too thin. Why bother- these things were done when 1275 blocks were rocking horse dung, back in the 60s. Just come & buy a 1275 block. "There ain't no replacement for displacement", and.. "there's no substitute for cubic inches, except cubic money" I went through one block boring into oil gallery on number 4 piston to get imp piston setup, so I imagine that oversize imp pistons or other larger than 68mm would be very hit and miss. |
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