Compression 12,6:1

[Clio172-DK]

Hey!

Can you drive with 98 octane with that compression? My ECU is remapped.

 

[BenR]

yes, but you will have to remap again if you havent done so to suit the compression increase already.

 

[edde]

Yep I'm sure you could.
Why are you?

 

[Clio172-DK]

I would like the forged pistons along with cams. Just bought the Clio 182 manifold and a sport cat.

 

[edde]

I would like the forged pistons along with cams. Just bought the Clio 182 manifold and a sport cat.

Wy not get the head ported at the same time might as well.

 

[BenR]

you can increase the CR for next to free by skimming the head 40 thou (1mm), netting 12.36:1 CR.

Not always the 'ideal' thing but certainly cheaper than stripping a whole block and rehoning, running in, cost of parts and labour just for a nominal bump in compression.

 

[Clio172-DK]

BenR: NICE!! that's much cheaper

I'll get the head ported as well..

Do you know Kent Cams? i'm thinking of these

Supersport, power band 3000 - 7500, I 286 deg. & E 278 deg.

I can't remember the deg. of Clio 172..

 

[Waitey]

Don;t mention kent around here. So far due to pully faliures they have killed 3 engines.

 

[Clio172-DK]

Sorry :-(

Dosen't any of you like styling? All the pictures I can find in here are just with standard clios ?

 

[mini-valver]

Standard exterior is the new modified my friend.....

 

[garymac1]

Standard exterior is the new modified my friend.....

Thumbs up to that i'd say.

 

[MAXIBOY]

if buying cams buy catcams

 

[Adey.]

whats the stock comp ratio?

 

[Clio172-DK]

the stock ratio is 11,2:1 for a F4R730 and 11:1 for F4R732 and F4R736

mine is a F4R730

 

[Adey.]

sweet, cheers for that, how much can be taken off the head before the head is classed as scrap?

 

[edde]

sweet, cheers for that, how much can be taken off the head before the head is classed as scrap?

Cut if off the block.

 

[Adey.]

do they not run a wet liner in these blocks?

 

[Dan@SJM]

do they not run a wet liner in these blocks?

Nope.

 

[Adey.]

ahh right, im used to the old c1j, any one know how for you can overbore the block then? 2.1 2.2 ltrs?

 

[edde]

ahh right, im used to the old c1j, any one know how for you can overbore the block then? 2.1 2.2 ltrs?

There a place that was overboring to 2.2 liters I'm sure but I'd think head gasgets would be the problem. The Williams which are over bored have problem and thats when they use the longer throw cranks as well.

 

[Adey.]

custom gasket would sort that surley, wouldnt wana increase the throw any more, alreadys has a longish stroke as stock doesnt it?

 

[edde]

custom gasket would sort that surley, wouldnt wana increase the throw any more, alreadys has a longish stroke as stock doesnt it?

The Williams with the 2.2 engine kept having trouble no idea what the probl;em was exactly but it did break have loads of trouble apparently.

BenR is your person to speak to about overboring possible problems etc.

 

[Adey.]

cooolio, cheers for the info man

 

[BenR]

stroke it, stroke it and stroke it some more.

dont take material off the block or you'll end up with a teeny quench depth and start smacking the piston into the head.

head can be skimmed alot, depends how good you are at controlling cam timing.