Camshaft profiles.

[Kelv]

Hopefully a different camshaft question...

i know there are the usual 421's, 428's and 438's etc, along with some now using the 197 profiles, but is there anything out there a bit more lairy, namely for a high compression engine that's purely for track use?
im happy to consider solid lifters if required, along with a lairy camshaft profile if the rev limit can accommodate going higher to suit.

but what else is out there, what has been tried and tested and given proven good results?
or is it a case of sticking to what's mentioned above even with high compression?

cheers.

 

[T.Trophy]

Kelv, catcams do a range of race cams that delete the vvt and have been proven to work well with high comp and high RPM. I think probably the most extreme set up is the catcam one RStuning and BigAsh are using.

 

[Dan@SJM]

422's.

 

[Kelv]

Short and sweet Dan.
any more info on them, do they need anything else to run... ie solid lifters, decent valve cut outs etc

 

[Dan@SJM]

Haha. Yeh they need ITB's (as expected really) they need larger valve cut outs in the pistons so forged build (I can supply those pretty competitively priced too) power band from 5-8krpm/

 

[Dan519]

Haha. Yeh they need ITB's (as expected really) they need larger valve cut outs in the pistons so forged build (I can supply those pretty competitively priced too) power band from 5-8krpm/

No they don't need itbs. Pete's racecar runs 422s, high comp and stock ported inlet. 217bhp 170lb/ft

 

[Carbonraider]

No they don't need itbs. Pete's racecar runs 422s, high comp and stock ported inlet. 217bhp 170lb/ft

Did Pete have further head work done to accommodate these?

 

[Dan@SJM]

Ok. They need ITB's to make the most of them then.

 

[Ph1 Tom]

ayk2008 runs catcams 553 with rs2 inlet

http://www.cliosport.net/forum/showthread.php?717050-Show-me-your-graph!/page6

 

[Dan@SJM]

Certainly some interesting results, the only experience I have of cams in an rs2 is 438's, and it wasn't 'that' impressive. It certainly isn't the best of engines, but it was asking for 6% less fuel than mine was on the 197's.

 

[Dan519]

Did Pete have further head work done to accommodate these?

no, just the different springs that you must run

 

[Chi]

Sounds like there's some good power to be had with just cams!

 

[Kelv]

Dan, would you say the springs are a necessity with the 422 cams?
standard lifters still acceptable or would these benefit from being upgraded aswell?

 

[mark123]

This tables lists the cams and the additional bits required e.g. springs, solid lifters...

http://www.catcams.co.uk/acatalog/Renault_clio_rs.html

 

[Kelv]

I tried to read through that yesterday but couldn't access some of the info.

 

[mark123]

422 and 423 just need springs, but due to the lift+duration you need pistons with cut outs. 420,421 and 428 use std parts. 551,2,3 need springs plus solid lifters (or at something extra anyway).

I thought it was interesting that the 197 profiles are different even with out VVT

http://www.catcams.co.uk/acatalog/Full-profile-list-5.html

Both would fit an F4R if you were removing VVT anyway - more options to choose from.

 

[Kelv]

Cheers Mark
I think I've got the pistons under control at the mo, high comp with suitable cut outs and H section rods to compliment aswell.
i feel I'm pretty much set on the 422's, it's just working out in my mind wether to delete the VVT and the costs involved to suit.