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[wildheart]

What would the cost/benefits be?
I am thinking of getting all the bits over the next 12 months(got to sort out the s1 first),i am thinking 1.8 zetec bottom end,mild ported head,uprated carb,piper/kent cam with solid lifters.

Would this lot make for a good package on the road while still having some fuel econemy
And with the solid lifters in am i right in thinking it will be safe to rev to 7k+.

Cheers peeps

[chumkila]

benefits = rapid ride

[MadcatCraig]

compression will be too low using normal zetec pistons too low for normally aspirated but ok for turbo

if ure using carb it will run liek a sack of s**t so u will need new pistons to make compression ratio higher !

[wildheart]

I've been told a while back by one tuner(cant remember who now)that if i have the head skimmed by a certain amount,depending if you use 1.8 or 2 litre that the compresion will be fine for an old xr2.

[MadcatCraig]

im not sure about the size of an xr2 head but with a turbo head on 1800 zetec bottom end the compression is arround 8:1 this is way too low for N/A carbed lump !

[MadcatCraig]

head skimmed

ure talking a lot of skimming off the head ! i wouldnt want to do that !

[The Gilly]

why not just pop a turbo on it to then?

[wildheart]

POP A TURBO ON TOO

I wish,but while my s1 is off the road for winter i have to get a stage 2 turbo(original one just died)a karl norris stage 3 head,grs alloy radiator and kenlowe fan to go with my twin pass intercooler that is on its way.
Oh yeah i now need two new tyres aswell on it

So as you can imagine that lot aint gonna be cheap,thats why im looking for a cheap rise in power on the xr2.

[Andy'sFRST]

Skim the head by 2.5mm for the 1800, 1.5mm for the 2000 all will give you a C/R of 10.5:1 but if you don't want to do that then fit a lean burn CVH head then you don't have to skim it as much.

[festajon]

I have been researching this as i should be doin it within the next few months!! Compression ratio works out around 8.6 or 8.9:1 using standard zetec pistons from a 1.8 bottom end. Compression does have to be higher on carbed engines slightly, so a head skim would be good. Even the 1.8 CVH bottom end conversion from ferriday engineering uses standard 1.8 zetec pistons, and they recommend getting the head skimmed by their guidance and tollerances, and costs £30 for them to do it. Sounds like a good package, but fuel economy is always a bit pants on carbs to be honest, tho wont be too bad if u stick a weber performance carb on, a DFTM i think or may be DATR, tis on their website tho. You'd be lookin at around 120-125ish bhp with that lot on, and loadsa torque

[PF Dave]

Skim the head 2.5mm

I have skimmed 80 thou of an inch of mine and thats given a 11:1 compression ration. 2.5mm off the head cant be good. If you need to skim it then take it off the top of the block (and thats taking it for granted that the engine ro head has not been skimmed before btw - you never know what someone previous has done!)

as for a zetec bottom end on carbs...ask cubby but he is doing exactly as the man is asking above and is not changing pistons as far as I know...no need. If you need to up the compression ratio skim the block (As above)

Yes it will be pretty damn rapid and still be ok on fuel too.

as for the solid lifters they allow the drivetrain side of things to rev upward of 7k as the lifters cant get to the point where they cant pump up as they are fixed (aka solid) BUT that doesnt mean your bottom end will take it...Zetec should be fine to 7k but anymore and your pushing your luck as the conrods arnt massively different to the CVH con rods and its normally these or the big end bolts that give way when over revving.

Oh and if there setup right carbs are suprisingly efficent!

[The Gilly]

Thanks for posting what I'd told you Dave I really couldn't be bothered after working on that cossie all day.

[PF Dave]

You cheeky git! What you told ME?

[cubby240]

I am building a 2.0l ZVH with twin 45's etc.... Like Dave say's get the block skimmed as skimming that much off the head will drastically reduce the combustion area. We don't know exactly how much to take off the block as yet as we have not decided whether to go fro a 300 or a 320 cam.

Cubby

[wildheart]

im now thinking of a full 16valve conversion

[Andy'sFRST]

Theres nothing wrong with skimming the head cos Ian Howell and HT Racing say its o.k as long as you cut valve pockets in the pistons HT Racing likes to use the lean burn head cos you don't need to skim it that much

Wildheart have a look at for the 16v conversion
http://www.jimhearne.co.uk/zetecinMk2.htm

[Mexi]

freakpower on here is running a zvh on carbs, bout 175bhp i think.

blokie with a red orion!

cant see a problem me self