Catcam 403's

[TB Rich]

Searched a lot on here but can't find anyone using 403's and what sort of power they produce?

Guessing about 230ish (assume high comp build), but if anyone knows someone using them and maybe a RR graph that would be great

Cheers

 

[Fernandez]

I've not heard of anyone on here running 403's, simply because you can't run them with std pistons. As you point out you need the higher comp maxi pistons.

I do however know of someone who's just built a 250bhp 197 motor using the maxi pistons and the Catcam follower kit amongst other bits.

I'll ask what cams he on as I'm not sure on the full spec.

 

[TB Rich]

mmm solid lifters yeah I'm not going that far, still want to retain a reasonable idle and a solid setup requires more service maintenance. Retaining hyd lifters and vvt are 2 requirements for a road car I think. Plus if you want solids you'll probably be running a cam that needs ITB's to idle properly, which isn't an option yet on the mk3.

 

[FaithlessEmo]

I belive Titan make ITB's for the mk3

 

[TB Rich]

Titan are roller barrell aren't they? Not so good with transient trottle so with a road car i'd rather have another set of Jenvey's.

The ECU is the issue, when Ktec release the Gen128 then I may conisder ITB's again, but modern canbus integrated cars with DBW are not just a case of slapping in a DTA etc anymore

 

[john_walker74]

I believe 519 Automotive has been working with Canems on an ecu for the 197 / 200...

 

[Fernandez]

mmm solid lifters yeah I'm not going that far, still want to retain a reasonable idle and a solid setup requires more service maintenance. Retaining hyd lifters and vvt are 2 requirements for a road car I think. Plus if you want solids you'll probably be running a cam that needs ITB's to idle properly, which isn't an option yet on the mk3.

His is a rally car so road comfort is not a requirement.

I belive Titan make ITB's for the mk3

They do but as Rich sums it it perfectly.

Titan are roller barrell aren't they? Not so good with transient trottle so with a road car i'd rather have another set of Jenvey's.

The ECU is the issue, when Ktec release the Gen128 then I may conisder ITB's again, but modern canbus integrated cars with DBW are not just a case of slapping in a DTA etc anymore

 

[Yiannis197]

Does anyone know how far Ktec is from releasing the Gen128 ecu? They have been doing it for ages...

Rich, looking forward to your build..

 

[PROIL]

im using 405's

will get a copy of the graph shortly,

any more info on the cat cam follower kit fernandez

 

[Fernandez]

im using 405's

will get a copy of the graph shortly,

any more info on the cat cam follower kit fernandez

From CatCam

Cat Cams launches Renault F4R finger followers for high rpm usage*
Belgium based high performance valvetrain specialist Cat Cams NV is pleased to announce a replacement finger cam follower package for the highly popular 2.0-litre, 16-valve Renault F4R engines as used in the Clio 172 / 182 / 197 and 200 models. In standard form the original RenaultSport valvetrain limits the F4R’s power output to around 260 bhp and 7800 rpm, because the standard roller finger followers are a known weak point and are not designed for prolonged high engine speeds. Therefore Cat Cams decided to redesign the F4R’s valvetrain following extensive CAD examination of various layout options.*

Cat Cams settled on using new, bespoke finger cam followers that feature sliding contact. To ensure that these followers remain aligned on the valve top, the original RenaultSport F4R hydraulic lash adjusters are replaced by Cat Cam’s solid inserts, which are connected and locked by a common shaft. This shaft also acts as the rotation axis to make it impossible for the cam follower to leave its pivot.

The exact geometry for the new sliding finger followers was determined using Cat Cams’ dedicated in-house software for detailed motion analysis, while Finite Element Analysis (FEA) software was used to optimise strength, stiffness and weight. Main target parameters included: system clearance for 15mm valve lift, and a 40mm contact diameter for the virtual equivalent bucket tappet. Finally, a default range of cam profiles was developed, again using state-of-the-art cam design software that is continuously being developed on the premises since 1998.*

With the new Cat Cam’s set up, the valve clearance on the F4R motor is set using lash caps with an extra long 4mm skirt sliding over the valve tip, and dual valve springs (manufactured by PAC Racing) with lightweight steel retainers and spring seats complete the kit.

Installation of the Cat Cams F4R finger cam follower setup requires a slot be machined in the cylinder head between the spark plug hole and the cam bearing, simply to provide the required clearance for the connecting shaft.*

Ken Stessens, responsible for cam design and product development, testifies from own experience: "A simple manual milling machine with tilt table, a bullnose tool and 2 hours of hassle-free labour is all it takes to install the new cam follower hardware."

Once the Cat Cams RenaultSport F4R engine finger cam follower setup is installed, the high rpm potential of the engine can be fully realised and the valvetrain ceases to be a weak link. This theoretically endows the F4R motor with 9,000 rpm / 300 bhp plus potential when built using upgraded forged crankshaft, connecting rods and pistons.*

Interested parties should please contact Cat Cams UK for more information and pricing on the RenaultSport F4R finger cam follower upgrade and associated cam profiles.*

 

[PROIL]

any pics of the engine build

 

[PROIL]

last time it was mapped

 

[Fernandez]

any pics of the engine build

I'll ask for some Paul

 

[PROIL]

Thanks very much,
be good to see

 

[Fernandez]

Thanks very much,
be good to see

I know the follower kit requires some head work in order to fit

 

[PROIL]

yes have seen that on cat cams website, not cheap

 

[jordanframcisss]

View attachment 10956

last time it was mapped

What you done to get it to that power?

 

[PROIL]

Rods, pistons, single piece valves, uprated valve springs, cat cams, AT throttle bodies

Contemplating changing to non vvt cams and vernier pulleys, felt our old car had more power with the non vvt

And get some head work done

 

[TB Rich]

I'm told 403's are about a similar profile to the R3 Maxi cams, so good for about 230bhp. I would guess 405's must be closer to the R3 Maxi Evo which is 250bhp. I would assume a figure inbetween those 2 would be expected for 405's by my powers of deduction??
I wonder therefore if some good power could be unlocked from getting the Maxi style manifold. Based on the fact that for the 230bhp R3, Renualt went to the effort of changing to one, so I would have thought no question for the bigger cams it'll help.

As you know, just fitting to a stock engine managed to change the fueling so drasticly it cracked the pistons in 4 days, so it must need a boat load more fuel once on.

 

[PROIL]

yes hoping to have the R3 manifold early in the new year, along with a bit of head work so will post details once it has been re mapped again

cant be far off using 1ltr fuel per mile as it is just now, so wouldnt make for a very good every day car