Clio 172 Non-VVT Cams

[prodriv3r84]

Anyone running Any one running non-vvt Cat-Cams 4322, 433, 431 or 434 ?


Thanks

 

[Brucefil]

I'm running 431's. Make sure you get Cam vernier as you will need to dial in the Cam overlap

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[prodriv3r84]

I'm running 431's. Make sure you get Cam vernier as you will need to dial in the Cam overlap

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What is the power band RPM that you get on 431?

 

[Brucefil]

I'm getting a pretty flat torque curve and ran the car up to a 7750 rev limiter as revs are important being a race car.

Below dunk is at the wheels. Gained about 20hp by moving the cams.

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[Dibbs]

Old post I know! Looking to run 434s but concerned about piston valve contact. What power did you see in the end Bruce?

 

[prodriv3r84]

I build and engine with 434 from cat recently.
You will get a very tigth intake Valve to Piston distance but OK at 4.30mm TDC timing in case you are using Wossner std rod size, If you use the long rod version Piston KIT (Super car) you will get some extra 1mm aprox.

Regards

 

[Dibbs]

That’s great thank you, I will change the rods along with the wossner piston kit. Have you run the engine and mapped it yet?

 

[prodriv3r84]

Yes and already raced, but broken gearbox now.

 

[Dibbs]

What sort of power did it make? Nice delivery? Oh dear 😅

 

[prodriv3r84]

All the 433, 431 and 434 make good power, I would chose the cam regarding in on what type and gear ratio or engine preparation.
434 make a very linear/flat torque curve, not the big torque at 5800rpm that 433 makes.
The engine made 245hp at 7800rpm (Engine) and 245Nm, similar curves that @Brucefil posted. (Verniers adjusted in order to reduce the 6000-6300rpm (“hole”).

Cheers

 

[Dibbs]

Very good figures! Who mapped that? I might look to build something similar

 

[prodriv3r84]

XPower Equipamentos a Portuguese Company ECU Wiring and Mapping experts.

Cheers