1071 Engine

[steve1071]

My 1071 is on plus 60 and looks like it needs boring. What are my best options, presumably 73mm or sleeve it back to standard? And what pistons are recommended for a fast road motor.

Cheers

[wantafaster1]

You can get 72.5mm pistons from Keith Calver , depends on the amount of wear, it's 12 thou bigger than you have.
Second time this week I've mentioned him, don't work for him and other than buying some bits I don't know him lol!

[steve1071]

Thanks

Not far from me and need to go over that way soon for work.

[BRI MK1]

Steve get Southam mini metro to fit new liners back to standard best way out cheers Brian.

[Spider]

If it were me, I'd have the block sleeved back to either standard or +0.020". Sleeves are available that will take boring to +0.040" over the initial finished sleeved size, so say you go for standards, then it can be done again at +0.020" and then +0.040", so you'll get another 2 'goes' for the investment.

There seems to be a negative view of sleeves and I really can't see why. Half decent sleeves are a better bore material than the 'straight' blocks are and from my experience, the bore and ring life is usually around 3 times that of un-sleeved blocks.

[steve1071]

Cheers chaps, I'm going to have a word with my engineering shop and Keith Calver tomorrow and go from there.