Hi Guys

Does anyone one know the differences between the fiesta turbo head and the escort turbo head etc,

Just rebuilding the FRST since its melted the head between 4th and 3rd cylinder, it had a escort head on before the one with 6 inlet studs and 8 exhaust think MFI, witch i ran with EFI and an adaptor plate, now i've seen a head of a fiesta turbo for sale,

i was wondering if their is any performane differences between the heads and witch one is best for porting etc. Cheers Seb

Since the guy fitted a escort head when he rebuilt the engine last year so was wondering why,


Cheers Guys

Seb

 

Just been talking to mate

And he was saying the escort head has a slightly bigger exhaust valve and the escorts head on a fiesta block will up the compression more than using a fiesta head, recons this is why it could have blown the head gasket since it had a group a etc

you guys shed any more light on this etc cheers Seb

 

the BEST head is the CFI 1.4 head that has heart shaped chambers( think thats what there called)

get one of them and hand it over to karl norris and get him to work it proper and you will have the best head cash can buy and there peanuts to pick up in breakers too and was on the mk5 engines too

 

Yeah the leanburn head, i have one of them of a fiesta 1.6 cvh of a f reg sport, but the pistons are different the rs has flatop pistons and the leanburn (heartshape) engine had sloping pistons will the leanburn head work well with the flat pistons etc, also will the insert bit not raise the comp too much

i heard that the leanburn heads suffers from valve shrouding aswell and generally gives less horsepower, i heard that the xr2i heads are supposed to be the best since they have thick walls so are good for porting

but then im not sure on these just what i've read of the internet etc.

Cheers Ginge i will consider it, you guys got any more info

Cheers Seb

 

L/b has a better squish chamber = better burn, but the ports as std are not as good a Hemi head.


As far as i'm aware, RST and FRST the only difference is the injector cut outs.



i used to use lean burn's on my old CVH engines, with best results, more torque and power at lower boost, even when spec and c/r was the same, just head swap.

But all my heads are ported and flowed by myself.


on my next build, i will go back to my L/B heads.

 

so would a leanburn head just fit straight on or would it need modifying would the c/r and that be ok or would i need low comp pistons or decomp plate etc,the l/b i got is no good for it since i had a 40thou skim on it when it was on my old N/A car.

 

C/r will be your issue, as your's will go from 8.0:1 on std hemi head, to 8.53:1 on a unskimmed hemi head.


Dont bother with de comp plates, if you do, go low comp pistons.




I would go std FRST head for ease and cost/time.