lumpy cam

hypaTG · backyard mechanic Joined: 15 Oct 2002 Posts: 524

Hey everyone,
I probably sound like a cockhead asking this, but i have been reading all this stuff about cams and stuff, and what exactly is a lumpy cam, what difference does it make and how much does it cost and what does it involve?
Cheers again.

TUFF_TE · tinkerer Joined: 12 Sep 2002 Posts: 114

make the valve go higher or stay up longer and other shit like that so you can get more air/fuel in the cylender than normal and also so you can get the exhaust gas out quicker.
I think

Tuff Te

Reddez · tinkerer Joined: 29 Oct 2002 Posts: 353

It changes the duration valves open or close for, including over lap, etc. Cams come in stages etc, a lumpy cam is very aggressive and gives better power in the high rpm bands, but will be shit drivin normally, they literally lump along, you wouldve heard v8s with a similar sound, streetable cams are the best. Lumpy cams are generally only for high performance/racing applications only, trust me they are a bitch in the city, driving slowly...

TGred · rice boy Joined: 06 Jun 2002 Posts: 23

Take a look at this link: http://www.howstuffworks.com/camshaft.htm

I got my Stage 2 Crow Cam for $150 second-hand. It had only done about 1-2000 kms and was in a 4WD!! I think they're around $350 new.
I can notice a fair power difference after the installation of my cam. My 0-100kph time dropped a fair bit even without a suitable carby.
It's a bit sluggish when the RPM is below 2k, but I'd recommend getting a cam if you want more performance from your gem.