Jump to content
SAU Community

Recommended Posts

  • Replies 63
  • Created
  • Last Reply

Top Posters In This Topic

Can anyone explain the duration to me??

Duration of a camshaft is how long it keeps the

Inlet/exhaust valve open for. So if you look af a 360* wheel and you have 260* cams, the camshaft has to go around 260* before the valve closes again. Lift is how far the valve opens as in height. So if standard camshafts lift is 8.5

And your aftermarket camshafts lift is 10.25

Then obviously the cam lobe is going to push the valve down open further by 1.75 which there for increase's air intake to in most cases create more horsepower. :)

Just a basic run down if you can't get your head around it I can be more thorough.

Cheers Josh.

which 260s did you have ? would be awsome if you have before and after dyno charts to see the difference between the two cams ?

There is no real difference loaded up on the dyno. I've seen a back to back, graph actually looks pretty close.

Same as -9s and -5s on the dyno, they don't look worlds apart in response or anything.

But the difference lies in the transient response or on/off throttle on the dyno and that's where things were noticed. Also dependant on the headwork that's actually been done, that compliments the cam setup, so it's no one singular thing

If the change was same setup to same setup and the only change was cams then it would been interesting to see the difference

I've seen on my 34 the difference from going to type Rs from type Bs and it was a fair bit, same peak power but every thing happened 800 rpm sooner give or take

so for my 6266 turbo (medium size single turbo) which already has a lot of grunt up top, would benefit from type R cams or there abouts, small duration 9.1 lift, to help spool and bottom end response

wonder why so many people go type b then

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • You should have got a Maine Coone then. Only thing is they're big. But so cool, and just like a dog. Or, just get yourself a high performance dog. That'll teach you for wanting Parkour indoors 😛
    • Are you thinking of Bens R32? I don't remember if his went through the bonnet itself, but it went through the chassis rail. Brad (RISKIN) bought it, and turned it into a track car. It's funny how anti people are of Jim Berry now. I remember when I pulled mine out (during an engine change) and inspected it and found it cracking badly. At that point in time so many people were even on SAU, were so pro Jim Berry, and that was after Bens GTR exploded his quite publically.
    • That's one of the reasons I got that breed, they look weird, the other reasons are they small, they are very vocal, and run around like they are on crack, I didn't want a breed that just sits around, these two are like kids on red cordial  My daughter has one, and it's a laugh riot, constantly doing Parkour around the house, sits on her shoulder, plays catch, and constantly runs around the house taking turns chasing the dog around, her Bermese though, just lays around with constant bitch face, and just looks on in utter disgust at the cat and dog playing together 
    • I'm getting PTSD flashbacks seeing that name again.  With my turbo swift, I got 1,500km of street use on a Jim Berry clutch before it exploded and took out my input shaft with it. 
    • It always seems the uglier an animal is the more is costs
×
×
  • Create New...