P.H.A.T 5.0

hey, i have a 94 mustang gt i just bought a set of trick flow twisted wedge heads and i am looking at cams. I found a Lunati cam at summit that i like but am not sure what 2 go with/can go wiht a Hydraulic flat tappet, Solid Flat Tappet, Hydraulic Roller Tappet, or Solid Roller Tappet. what are the diffs. of all of them. i would like something with a .560 + lift.

cammedlx

You will need a hyd. roller cam..Also if i was you i would look into a custom grind from someone like ed curtis or that region..Also why so much lift if the heads stop flowing at .525 then why do you need that much.

P.H.A.T 5.0

you are right but this was the cam i am looking at what do you/you guys think would it go good with the heads http://store.summitracing.com/defaul...=egnsearch.asp

FullAuto

Just because a head may peak at a certain lift doesn't mean you limit the cam to that. If you have more cam lift, you'll pass peak flow twice. The flow may also fall off slower past peak than low lift numbers. My new Jay Allen cam is well over .200 lift more than my peak head airflow.

This is not a blanket recommendation to run out and buy oversized cams. But there is a method to the madness.

cammedlx

I don't get this one...since you question my knowledge all the time please explain your reasons better each time you pretty much say im wrong...And in my eyes once a head gets its peak flow at a certain lift there is no reason to exceed it other then to look cool when you tell your freinds you have a .700 lift solid roller...But my heads peak at .450.

FullAuto

Let's use round numbers and an over-simplified example:

Say you peak at .450 lift and 250cfm. At .400 lift you may flow 225cfm. At .500 lift you may flow 240cfm. By choosing a cam that goes up to .500 lift, you spend more time in the 240-250cfm range. After peak lift, you come back down to peak airflow and pass it twice in one cam revolution. Spending more time up there may be of added benefit rather than just peaking lift at .450 and then falling off in airflow the entire back side of the cam lobe. Understand this also assumes an equal cam lobe design. You can also have a major impact by just changing ramp rates on the lobe and spending more time in the area that benefits your combo. For a real life example, at my head's peak flow, I flow 4 cfm less than peak at .050 greater lift and 6 cfm less than peak at .150 greater lift. But it flows 5cfm less at .050 less lift and 34 cfm less at .150 less lift. So after my peak airflow, it's a pretty flat curve. Prior to peak, it's much more steep.

This may not have been a great example but it should help people see what I'm talking about. As for my cam, I did not design it. If you think it's just to "look cool" maybe you should have that conversation with Jay Allen at Camshaft Innovations. I never specifically asked for something "cool" and he never mentioned that as a selling point.

I have nothing against you. You asked a question in your first post and I answered it. All I said in the last thread was I disagreed with you and you called me a moron. Not everyone is going to agree with each other. Maybe we should just agree to disagree. I speak from my experience and you may as well. That's fine with me. I will continue to post my honest opinion and people can take it or leave it at that.