will a grp n head gasket for a 1.3 fit a hybrid 1.4?

[johnnynova]

1.2 head on 1.4 block, wil a grp n head gasket fit it?

cheers
john

[j1400]

Provided the firing rings clear the pistons yes. but I wold say a 1.4 head gasket is needed.

[Snowface]

i think u need a 1.2 head gasket. Apparently to the gasket that goes with the head your using.

So 1200 head = 1200 gasket.

could get both and compare.

[rgv_stu]

use a 1200 or 1400 one
the 1400 one is thicker btw

the 1300 one will be too small bore

[johnnynova]

is there any advantage in using a thicker one, won't it lower my compressiuon ratio??

[rgv_stu]

well if your fitting a 1200 head then the comp ratio will go up anyway, by using the 1200 gasket it will go up even more.

[Ste_Nova]

i used a 1.4 gasket on mine

[johnnynova]

higher compression with high octane fuel (ie q8 p8 ron) (shell optimax)
gives you better performance doesnt it?

so still which is better for performance?

need sum info from sum1 who has used both on seperate occasions as to which is better?


thanks for the info already ;-)

john

[mc_hawkings]

I have used a 1.2 gasket on mine as said it highers compression. I just thought the head gave better flow as ports are bigger than 1.4 which are tiny square ports. I'd say it would be the gaskets that gives the highering & lowering of CR

1.4 gasket is twice as thick than that of 1.2 gasket

[Snowface]

you won;t need to run High octane fuel until your C/r is over 11.5:1/12:1 at least.

Just by using a 1200 gasket (head) on a 1400 bottom end will give you around 11:1 i think.

[mc_hawkings]

Mate do you know of a good way of checking CR accuratly.... book figures for a standard 1.4nv are 9.1 thats quite alot 11.1......istill think its just because of the gasket & not head

[Snowface]

1200 engine has a cr of 10:1,

so 1200/10 = 120.

using the 1200 head on ur 1400 bottom end....

1400/120 = 11.667

[johnnynova]

ok thanks, so i think i'll go for the 1.2 gasket!

cheers all

i wil let you know once its done and rolling road'd

[Stuart]

thats a very rough way to work out the new CR, but i suppose it will do the job


the only way to do it accurately is to

divide the swept capacity of one cylinder by the compressed capacity, ie stroke volume over head volume. (in its most basic sense)

[Aragorn]

to make snowfaces calculation slightly more accurate u should have done:

vol @ BDC / vol @ TDC

vol @ BDC is the engine capacity + head vol, vol @ TDC is the head vol alone

(1200+120) / 120, which is 11:1 and thats not the compression ratio of the 1200 ;)

if we assume cyl head vol is 135 we get: (1200+135) / 135 = 9.9ish

then fit that to a 1.4 (assuming any pistons dishes are the same)

(1400+135) /135 = 11.3

[mc_hawkings]

I worked out snowfaces way of lowering CR using 1600 head on 1.4 block came to 8.75 if i use a thickness of 1.2 gasket (a steel or sbd item) should up it enough to get to 9.2 right CR for a turbo.

You couldnt work it out using your method could you please;)