porting / bigger valves / 0.1mm skim questions

[opexo]

So i've finally found a place with a proper hardware for head porting. They also can replace the standard valves with bigger ones.

The thing is that i want to make my car/engine with as much standard ford parts as possible while taking the "maximum" out of it.

I know the most restricting thing in the zetec is the head after it has the HO intake 2.0 throttle maf etc. So i'd like to "fix" this a bit by porting it. I'd like to run with standard management too - 2.0 DALE eec-iv.

Also i'm thinking to get 0,1mm off the head to get around 11,3 compression ratio.

 

If i go for porting + bigger valves, will the standard management cope with the fueling or it will lean out the mixture and i'd have to think about mega (which i don't wanna;p) ?

If i go for porting + bigger valves + 0,1 skim off the head to go ~11,3 CR will i go into problems with engine knocking? Or leaning the mix?

Or (which i'm thinking the most for) if i go just for porting + skim 0,1mm to get ~11,3 CR without bigger valves will i get engine knocking? Here i don't think it'll lean the mix. I know it has been done with 2.0 block and 1.8 head +skim without engine knocking but with the head porting allowing more A/F mix to go in would this change the things so maybe the option would be to just port the head w/o skimming to keep the CR@~10,8?

 

And another question - if i go for porting + bigger valves will the standard 2.0 or rs1800 cams do fine or i'll have to replace them? Cause i won't be able to..

Thanks:}

[Stu]

I know the most restricting thing in the zetec is the head after it has the HO intake 2.0 throttle maf etc.

 

Wrong. Don't waste your time and money.

[opexo]

ok so just 0.1mm skim for 11,3CR (it'll run LPG some time in the future with high octane gasoline anyway so it's gonna be ok i think)

Which reminds me for another question - where is the best place to drill holes in the sandwich plate for the lpg injectors (or the nozzles after the injectors i think is more correct) because i don't want to drill the HO intake like most people do? And that way they will be closer to the intake valves too - the closer the better.

[opexo]

ok so just 0.1mm skim for 11,3CR (it'll run LPG some time in the future with high octane gasoline anyway so it's gonna be ok i think)

Which reminds me for another question - where is the best place to drill holes in the sandwich plate for the lpg injectors (or the nozzles after the injectors i think is more correct) because i don't want to drill the HO intake like most people do? And that way they will be closer to the intake valves too - the closer the better.

[Stu]

I'd re-visit your calculations. 0.1mm for 11.3 CR? You're dreaming. 0.1mm would barely touch it!

[Ahmotorsport]

The standard Zetec valves are good for a hell of a lot more power than a head skim and porting without throttle bodies/carbs will give.

[Andy 3i]

0.1mm is almost like a standard skim isn't it? I've had 1mm taken off...which is more like 1.2-1.3mm as its probably been skimmed once or twice before. Although I couldn't tell you the precise CR...it's on standard valves, unported head and standard efi manifold

[opexo]

I refer to this thread for the calculations: http://davespages.forumotion.com/t10-zetec...io-calculations

I was quoting by memory (which isnt that sharp these days )

20 thou (or 0,5mm) skim off a 2.0 head on 2.0 block gives 10,64CR

1.8 head on 2.0 block w/o any skimming (and standard gasket) gives 10,78CR

The author (Davespages) says he skimmed the head (1.8 on 2.0 block) 0.2mm and the CR went up to 11,42

So yea my math sucks atm 0,1mm skim should give (11,42-10,78)/2+10,78=0,64/2+10,78=0,32+10,78=11,1CR which imo i's perfect both for regular petrol and lpg.

 

I've abandoned completely the thoughts about the valves and porting etc yea they are stupid move for what i want to do.

Edited May 6, 2013 by opexo

[Stu]

Where in your post did you easy you were going to put a 1.8 head on a 2.0 block?

[opexo]

In the description of the title. " .. about 2.0 bottom and (*)RS1800 head+intake and the rest"

It crossed my mind that it might not get noticed but..;p

 

(*)-fiesta

Edited May 6, 2013 by opexo

[opexo]

Here is the thing - my goal is to hit 150hp. This is the whole story. Anything above it is welcome but 150 is the bottom line.

Will i be able to do it with 2.0 bottom and that head and intake and the rest - i don't know really. I hope.

I've heard that it's achievable but i have not seen anywhere to be explained exactly how, like "i've done this and made that.." etc

Any suggestions are welcome. Like tiny mods here and there, fine tuning somewhere etc. Because more threads will come from me anyway, i feel it

[scottybo]

ryanml managed 151 with his 2l n i dont think he even really did a great deal to it so its definitely possible. im pushing for 150 out of my 1.8 130

[Stu]

Here is the thing - my goal is to hit 150hp. This is the whole story. Anything above it is welcome but 150 is the bottom line.

Will i be able to do it with 2.0 bottom and that head and intake and the rest - i don't know really. I hope.

I've heard that it's achievable but i have not seen anywhere to be explained exactly how, like "i've done this and made that.." etc

Any suggestions are welcome. Like tiny mods here and there, fine tuning somewhere etc. Because more threads will come from me anyway, i feel it

 

With a high compression ratio, de-cat, cams, super unleaded and appropriate tuning you can just about hit 150bhp on the 2L with the original intake tract. It's hardly worth it though unless you're doing the work anyway. You'd get used to the power in about 5 minutes.

 

Beyond this you need to remove the restrictive intake with either ITB's or carbs. Then you're only gaining 20-30bhp over where you were before, again not a huge increase.

 

I know I preach about turbocharged engines, but you just can't get the same performance per pound £ with n/a tuning.

 

A full on race spec 2 litre zetec may only have 160-170 ft-lb of torque. A stage 1 escort rs turbo engine from the early 80's will have more. Much more.

[opexo]

The escort im driving is 115hp now. I already have a DALE 2.0 ecu and from Fiesta RS1800 the head+cams+HO intake+throttle and TPS sitting around.

I am on a pretty limited budget.

So i have 2 options

- swap cams intake etc on the current engine to get around 130hp and that's it or

- take out and sell the whole engine which is good w/o oil burning and changed water pump and cam belt set before 1000 miles (all that requiring good money for the engine) and get a decent 2.0 block on which i put new water pump, cam belt and the rest, mate it with the head and other parts i already have so in the end i end up with "new" engine ready to push up to 150hp. Bottom line: no money spent - 35hp gained.

 

I'm on your side, i'd love to go turbo too but i just can't see it pocket-wise in the near future.

Edited May 8, 2013 by opexo

[bongo]

if you want 150bhp or there abouts........do the rs2k i4 conversion.theyre 150 bhp standard. Edited May 8, 2013 by bongo