Thinking of high comp and forged rods

[ben_p]

Just bought a clio (picking it up on tuesday, fingers crossed)

Its a well known passed around car (stoddies)

Current engine spec.

Jenvey 48mm ITBs with matched inlets
Catcams 2428 camshafts
Lightened and balanced bottom end.
Mild headwork
Omex 600 ECU
Lightened Flywheel
182 Manifold with magnex twin
Sports cat


For piece of mind, im going to rebuild the BE (sending the head off for more work too)

But while im there, was thinking of fitting forged rods, arp bolts and replacing the OEM pistons with 12:6:1 forged items. Ive costed it at £1000 inc new shells etc.

Question - is it worth it? I know it will be more reliable at high RPM

1. Will i see a noticeable power increase
2. Is the max rpm determained by the poor valvetrain? i.e i cant rev it any higher anyway?
3. Will woosner work with 2428s?

 

[172bagss2]

EXCELLENT work Captain!!!

Although, fook rebuilding it - it will die eventually, so just rebuild it then!

New oil, strip & clean brakes, R888s. Done.

Then... Drive it! Hard. On track. Mint! :race:

 

[ben_p]

lol! you know me,

 

[172bagss2]

lol! you know me,

Exactly! All tinkering / $pending - and no driving!! :slap:

 

[W17GLE]

Get it driven!!! do a wales run as well while you are at it :rasp:

 

[ben_p]

Exactly! All tinkering / $pending - and no driving!! :slap:

LOL party in the garage, you dont need to drive them! Just tinker with them

 

[Fred@BTM]

i know 2 people selling rods and pistons, 2nd handers

 

[172bagss2]

i know 2 people selling rods and pistons, 2nd handers

Sounds good to me - but will be of no interest to £en_p...

 

[mikey_172]

did you buy this instead of the beemer

 

[ben_p]

did you buy this instead of the beemer

Yeah, keeping my e46 for a few months now as daily drive

 

[ben_p]

i know 2 people selling rods and pistons, 2nd handers

Brand? Cost?

cheers

 

[Fred@BTM]

both wossner pistons, not sure what make the rods are

 

[172bagss2]

Brand? Cost?

cheers

All-titanium construction. £3k. DONE!! :rasp:

 

[Gray]

Back in the fold

Fook spending more cash on it now... Just hammer it until something breaks then rebuild!!!

 

[172bagss2]

Back in the fold

Fook spending more cash on it now... Just hammer it until something breaks then rebuild!!!

Repost! :quiet:

 

[geesus69]

what happened to not having a clio again? :rasp:

 

[Ali]

Why bother...Barely done any work since GDI built it (Phil)

Radip car. 0-140+ nothing in it between me and Phil! FLAMES were incredible!

 

[ben_p]

Why bother...Barely done any work since GDI built it (Phil)

Radip car. 0-140+ nothing in it between me and Phil! FLAMES were incredible!

Just want to make sure its right and get a bit more power!

 

[ben_p]

what happened to not having a clio again? :rasp:

lol

 

[kevin_172]

Plans sound good man but as everyone Is saying, wait a while and then to it! I'm not going high comp on 428's as it really ain't worth it IMO. Wait till you have had some fun in it then go 422's high comp and new valve springs

 

[geesus69]

Need a car for the ring' this year, dont really want to do a clio again

to be fair you didn't commit 100%, so i'll let you off

best of luck with it pal, i owe you a few favours (understatement!) so give me a shout if you need anything

 

[172bagss2]

i owe you a few favours (understatement!) so give me a shout if you need anything

Don't worry, GRAY has returned all our favours with the Captain!

 

[deltav]

stick low comp pistons in, sell the itb's then supercharge it.

 

[Andyman]

stick low comp pistons in, sell the itb's then supercharge it.

Agree - ITB's might be good but s/charging is on another planet

 

[172bagss2]

stick low comp pistons in, sell the itb's then supercharge it.

PMSL - if only you knew mate..... :rasp:

 

[Gray]

double LOL!!!!

What about ITB's and S/C?

 

[deltav]

PMSL - if only you knew mate..... :rasp:

i do know. that's the point. charger is no problem at all.

 

[Fred@BTM]

stock engine, 310bhp+, AWT special, that'll do!

forged pistons? pah!

(although be careful on that bottom end ben, its been invaded more times than an Amsterdam special apparently!)

 

[crofty66]

Just a quick one. I amsaving up for a sc set up at the momant as i am in afghan. I have most of the info on figures etc i.e bhp and all that. Just wondering how it drives. Any help?

 

[iimushroomzii]

Whats all this Lol'ing about a supercharger?

 

[ben_p]

Whats all this Lol'ing about a supercharger?

LOL. Lets not evn take it any further!

Fred, cheers for the heads up on pistons.

 

[Gray]

All jokes aside...

Good too see you back Ben! And hopefully on a few track sessions this year??!?!!

I know Baggers has missed your sweet face x x

 

[ben_p]

yea,

FCS, the ring', oulten and baggers estate

 

[Gray]

LOL!

Destroying his collection of rare and exotic garden gnomes?

 

[Hutchie]

im not 100% sure on forged rods, as we tried some, but the ones we bought also fit the williams, thus are almost .5 of a mm shorter, lower compression....

that and we found that they didnt wanna lube the big ends properly, leading to rainbow heat effect on big ends, FUBAR'd!!

i would ballance crank run oem rods and 13:1 high comp pistons, but a cylinder head off a 138 engine (the two litre found in the mk3 clio and scenic etc, non sport engine) as it can be gas flowed better than the 172 head, its already ported at factory and its a hard job to get propper gains

arp bolts are a must

hutchie

 

[geesus69]

yea,

FCS, the ring', oulten and baggers estate

you not doing croft again? could have a night out like last time

or have you erased that weekend from your mind? lmfao:evil:

 

[Gray]

you not doing croft again? could have a night out like last time

or have you erased that weekend from your mind? lmfao:evil:

hahahaa... I could post some photos to remind us all of the alcohol fuelled evening! rough next morning was an understatement :dead:

 

[ben_p]

LOL, yea baggers can kiss goodbye to his garden!

What rods were they hutchie? I've already got the head sorted (benR)

Might just arp the big ends and fit high comp pistons then! I want to rev it to 8500 rpm

 

[172bagss2]

Lady-garden? :S

 

[stan*]

LOL, yea baggers can kiss goodbye to his garden!

What rods were they hutchie? I've already got the head sorted (benR)

Might just arp the big ends and fit high comp pistons then! I want to rev it to 8500 rpm

What cams does it have? No point revving there if its making peak power a bit below 8500rpm.

If it does rev there, Catcams H section rods are a good buy. Very well machined, no descrepencies between items (as see with other cheaper rods).
They are £599+vat.

As for the original qustion on gains from high comp pistons, the theoretical gain in HP is 2% per 1CR increase. Ive found this pretty much bang on true on actual engine dyno work. So you'be be looking at an approx 5% gain with Wossner off-the-shelf high comp pistons.