Cam is a crower roller hydraulic cam. says low rpm for 406 is 2900 peak torque is 4100 peak hp is 5600 and top rpm is 6100 on the crower site. 6100 is damn low for my internals. The guy claimed peak hp at 6400, but the heads and intake manifold are set up for 7800 easy. Was wondering how effective a roller cam was 'past' its rpm range. Ive heard it works differently with a roller than flat. Let me know, thanks.

 

a roller cam, as with any cam, past its "rpm range" is useless. I dont know why people these days are into high-RPM motors. My way of thinking (and common sense I guess) would be to build a motor that makes the most power at the lowest RPM possible. Why spin a motor to 7800RPM when you can spin it to 6000RPM and make the exact same power, be MUCH easier on parts, and be more streetable? Most hydraulic rollers arent too happy spinning high RPM's anyway.

 

You'll never hit 7800 without a rev kit.

Why so fast? You don't care how long the engine lasts? You don't care about streetability?

 

I got crower crank and rods in the engine it's not gonna break at 7800, it wont even break at 10,000. I dont need a rev kit, got head mounted rockers.

 

7800 with a hydraulic roller? WTF are you gonna do to control valve float?

What kind of rings you running? What's your max piston speed gonna be?

 

engine was built to go 10k.

Question was answered, thanks for replys.

 

If you want your engine to hang out at 7800 then you need to look into setting yourself up with solid lifters.

Better than asking the board about it is to explain your situation on the phone with someone at the company you are wanting to buy the cam from. If you already did that, I would like to hear what they said to do to use a hydraulic setup.

 

A hyd cam, flat or roller or solid or hydraulic, is NOT effective past the RPM at which it's effective. There are 2 reasons for a cam not working at any higher RPM; one is the timing of valve events being optimized for a particular RPM range, and the other is the mechanical properties of all the parts.

That cam (00404?) will not work past what they say it will. The range they give for it is based on reason #1 above. Its duration is chosen to provide max cyl fill within a certain range. At any higher RPM than that, the cyls will not fill completely, and the motor will produce less power than at a RPM where the cyls do fill completely.

Looks to me like if you want to go to 7800 RPM, you need a solid roller; not a hyd roller.

Basically, you just have the wrong cam for what you say you're trying to do.

A rev kit will help the lifters follw the cam profile more accurately. Doesn't matter what kind of rockers you have.