Fast road camshafts

[zentac]

mine are the HKS 272 profile, its a little lumpy at tickover but not too bad, we have had to take loads of fuel out of the map so far just for normal road use.

[bradc]

Any chance you'd be able to put up a video?

My Autronic has the car set to idle at about 1100rpm anyway, so it doesn't worry me if it is a bit lumpy at 650rpm or so. I think the more wild cams will be masked by the small turbos and extra capacity+cylinders anyway compared to say an EVO

[zentac]

we were having problems getting the gasses out of the engine with standard cams with 515bhp, the heads have been ported but we were still on standard cams. I will get a video up as soon as I can but off to nurburgh on wednesday so it probably wont be until I get back.

[bradc]

ok cool

[Mitsiman]

Will be interested to see your results for sure.

And for those that are confused, the HKS 272 profile is our favourite, but we also do a 264/272 profile as well and smaller. The HKS one is the one we sell the most of and is definitly the recomended choice for high horsepower applications.

And you don't need any shims with our units as these are brand new billets, not regrounds.

[Mark 4]

Will be interested to see your results for sure.

And for those that are confused, the HKS 272 profile is our favourite, but we also do a 264/272 profile as well and smaller. The HKS one is the one we sell the most of and is definitly the recomended choice for high horsepower applications.

And you don't need any shims with our units as these are brand new billets, not regrounds.

What is the lift on these ?

[Mitsiman]

they should be 0.300" lift if I recall correclty

[Mark 4]

I make that 7.62mm (give or take)

According to Zentacs sig he was running 265° and 10.8mm lift.

So, 7.62 sound a bit tame.

[Eurospec]

272's are fine. Idle is a bit lumpy, but thats about it.

The thing is though, dont go thinking cams will give you boat loads of power on their own. They dont. Some - yes, but not lots.

Normally you use cams to change the shape of the power curve to move the power around to be more where you want it.

Cheers,

Ben.

[zentac]

I make that 7.62mm (give or take)

According to Zentacs sig he was running 265° and 10.8mm lift.

So, 7.62 sound a bit tame.

the 265's were the original re-grinds I had done and one was bent so they never got fitted.

[Mark 4]

the 265's were the original re-grinds I had done and one was bent so they never got fitted.

So what lift do you have on the 272's please ?

[zentac]

Quick update - these engines NEED cams

Just back from the rollers, and I currently have the same power as last year 515bhp on pump fuel but on 1.5 bar (was 1.8 last year) so doing some more mapping today (need 2bar +) ready to race sunday..... I will just need to hold on tight and shut my eyes!

The only thing we have changed since last year are cams, valve springs & flywheel.

[Turbo_Steve]

Good info! Thanks Zentac!
So that's the HKS cams with 272 duration on both inlet and exhaust?
What's it like to drive "off boost"?
I don't doubt for a moment that at 500+bhp the cams are holding it back, but longer duration moves power "up the curve" (even more so on a turbocharged engine) so my concern is that a car that usually has children & shopping in, how big a compromise are they, and would something a little milder make more sense for the "daily driver" bridgade?

Or should I just buy an RS4 Avant? [/dreaming]

[zentac]

we are still mapping it but the 515bhp graph we had before was almost identical to the graph we currently have but now on lower boost. it was down about 10 lb/ft across the range, but we were only half way through mapping and hadn't really started putting ignition in which would have brought it back.

[Mitsiman]

sounding good. You are correct that the 272 hks profile is a "Mild" camshaft, its primary design is for road racing so big power spread, fat torque curve and good throttle response.

We can make larger profiles for sure, but they become strictly high rpm horsepoer enignes rather than a road rcing engine setup. Keep us up to date with the results