I was playing with the desktop dyno for about a month trying different cam duration, lifts and centerlines.
It seems like for my build these specs give me the best torque to hp ratio and keep it below 6500 rpms.

center line intake 111 exhaust 103
duration intake 225 exhaust .215
intake lift .415 exhaust .400

I dont want to rev much more then 6500 becuase I dont want to kill my lower end power. these really climb fast after about 3000 rpms to about 5500 for torque and from 3000 to about 6000 rpms for peak hp.

I called crower today I think I spoke to dave. He said we could go to about 420 lift with a .980 bind but we may need lash caps. So the manta part stiffened springs that i have should be safe for these cams I hope. I know the centerline is a bit backwords from traditional cams but like I said I'm not looking for peak rpm hp. Please feel free to leave your opinions or if you have any reason to believe why these wouldnt work please feel free to tell me why.

I have theorized for a long while now that the larger intake cam will give a broader flatter torque curve

I highlighted the Racetec Cams, they used the same principle. I ran the motor specs in your profile with the stock C/Ls and the Racetec cam specs and show a decent broad torque curve. Remember though, the motor is a small bore long stroke, which lends itself to a broad flat torque curve.

gmanz24 wrote:Re: Cams for LD9? Good choice?
Thursday, December 25, 2008 3:17 PM
gmanz24

...i found the specs as well as a bunch of others....


Stock LD9 Cams
198 degrees @ .050" with .354" lift for the intake
187 degrees @ .050" with .346" lift for the exhuast

Secret Cams
200 degrees @ .050" with .360" lift for the intake
200 degrees @ .050" with .375" lift for the exhaust

JBP Stage 1
200 degrees @ .050" with 375" lift for the intake
208 degrees @ .050" with 375" lift for the exhaust

JBP Stage 2
260 degrees @ .050" with .377" lift for the intake
268 degrees @ .050" with .375" lift for the exhaust

LevelZero Motorsports Cam Specs (Stage 2)
260 degrees @ .050" with .377" for the intake
268 degrees @ .050" with .375" for the exhaust

LevelZero Motorsports Cam Specs (Stage 1)
200 degrees @ .050" with .375" for the intake
208 degrees @ .050" with .375" for the exhaust

HO Cams (Require much modification)
212 degrees @ .050" with .410" lift for the intake
212 degrees @ .050" with .410" lift for the exhaust

W41 Cams (Require much modification)
218 degrees @ .050" with .410" lift for the intake
218 degrees @ .050" with .410" lift for the exhaust

Mantapart Mild Cams Specs ( LD9 )
198 degrees @ .050” with .360” lift for the intake
201 degrees @ .050” with .374” lift for the exhaust

Genertec XX5 Specs ( LD9 )
211 degrees @ .050” with .360” lift for the intake
212 degrees @ .050” with .360” lift for the exhaust

RaceTech ( LD9 )
216 degrees @ .050” with .380” lift for the intake
206 degrees @ .050” with .365” lift for the exhaust

RSM Cams
220 degrees @ .050" with .410" lift for the intake
220 degrees @ .050" with .410" lift for the exhaust

W41 #2 Cam Specs (Hot Cams or Escort profile)
226 degrees @ .050” with .410” lift for the intake
226 degrees @ .050” with .410 “ lift for the exhaust

Crane Cam specs
222 degrees @ .050 with a lift of .430” for the intake and exhaust




your welcome boys and girls

For my daily driver am strongly considering using my HO intake cam and LO exhaust cam just for this reason.

I got a call from colt cams today. he said he may beable to give me a nice grind from my secret cams. If I remember correct I think he said he might beable to go as high as .415 and 219 for the intake. I cant remember what he told me for the exhaust he can go but I'm pulling them out today and i'm gonna send them to him in the morning. We'll just have to wait and see hot this turns out I hope it works well.