6 replies to this topic

[truezie.]

hi ive got a 1275 engine i belive and was just wondering if anybody knows the rough diamiter in mm or cm of the piston to confirm it is a 1275 because it was taken from a scraper so just want to check it is what i was told! or is there any thing else to look for which is diffrent?

thanks

(sorry if its a darft question!)

[Asphalt]

70.66mm and the stroke is 81.28mm

Edited by Asphalt, 15 January 2010 - 02:48 PM.

[truezie.]

thanks for the quick reply
i just went and cleaned around the top of the piston and it says 71.34 so its prety mch the same is that right? or is that just nothing?!

thabnks again

[Asphalt]

thanks for the quick reply
i just went and cleaned around the top of the piston and it says 71.34 so its prety mch the same is that right? or is that just nothing?!

thabnks again

Could it be 71.37mm?

That would be a +.30" overbore size (gives about 1301cc). But you might struggle to find +.30 piston rings, it's a (nowadays) uncommon size and not produced anymore. I was told it's not impossible to fit shortened +.40 rings, though.

[Guess-Works.com]

Standard bore for a 1275 is 2.78" or 70.612mm

You then get factory oversizes which are +0.020", +0.030", +0.040" and +0.060"

In terms of bore diameters 71.34 is absolutely no where near 70.612, and not even close to any of the standard overbore sizes..

Edit *finger trouble on calculator*... could be a +30 ( as above )

Edited by Guess-Works.com, 15 January 2010 - 04:03 PM.

[truezie.]

it dose say on the piston +.03 (i think) on the other side of the piston which i only just noticed. so it could be like you say 1301cc?
it came out of a 1275 gt if its any diffrent?

so it could be a decent engine then?!

thanks for your help guys

Edited by truezie., 15 January 2010 - 05:15 PM.

[bmcecosse]

If it's in good nic - but the +30 makes absolutely no difference! Don't get excited about that.