General Uno Turbo head

[Aceuno]

Can anybody tell me how many cc's is in an mk2 uno turbo head?

 

[M@nticore]

Take your bore x stroke that is in mm, convert that to cm.
then use this equation, 3.14x half of bore x half of bore x stroke. then you get the cc's of one cylinder, Divide that by the compression ratio, then you will have the size of the combustion chamber inc the head gasket.

 

[M@nticore]

OK
bore x stroke of UT
80.5 x 67.4 with comp ratio of 7.8:1

3.14 x 4.025x4.025x6.74
= 342.86 cc per cyl

then devide 342.86 by 7.8

and that = 43.956 cc per combustion chamber inc gasket.

 

[alexGS]

... which is quite a lot relative to some of the other engines in the family!

I measured (with a flat piece of plastic having a hole drilled in it, and a pipette) the capacity of a FIAT 128 1116cc cylinder head - 32cc - and a 1290cc cylinder head - 34cc. I would expect the apparently-identical Uno 1116cc and 1301cc engine heads to have similar capacity. But the Turbo is obviously quite a lot larger (to give that lower compression ratio).

EDIT: One obvious assumption that calculation would make: that the piston goes all the way to the top of the bore, and that the piston has a flat top. Unfortunately, neither of these is necessarily true (the FIAT pistons always have valve cutouts, probably 2-3cc there, and in the N/A 1301cc engine the pistons don't get to the top). But on the whole, I think it gives you a fair idea (why do you need to know?)

-Alex

 

[starletdrifter]

anyone know the compression ratio of the 1301cc non-turbo engine?

thnks
Geoff

 

[alexGS]

9.14:1 according to the Mk1 handbook.

I think you're in NZ aren't you?

I think you added me to your MSN contact list, but I've never seen you online

-Alex