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Subject: "Camshaft discussion & comparison (Continued)" Previous topic | Next topic
cougar694uApr-25-05 07:52 AM
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#113047, "Camshaft discussion & comparison (Continued)"




          

I'm starting this thread because the other one is quite long.

This thread should only be posted in AFTER reading, RE-reading, and understanding the original thread (Click Here), or there are new cams to compare; and should be heavily moderated.

I'm continuing this from the end of the last thread with the specs of the Crower Stage 2 Turbo cam.

Here's a new cam to compare (taken directly off Exiles website):

Stage 2 - Turbo Grind
Grinds designed for use with forced unduction. Upgrading valve springs is highly recommended

Camshaft specifications:

Duration: Lift:
Intake: 249 deg. Intake: .410"
Exhaust: 246 deg. Exhaust: .403"

At .050" Tappet Lift:
Intake: Opens: -16.5 deg. ATDC
Closes: 23.5 degrees ABDC
Exhaust: Opens: 30.5 deg. BBDC
Closes: -25.5 degrees BTDC

Lobe Separation: 114 degrees

Duration At .050" Tappet Lift:
Intake: 187 deg. Exhaust: 185 deg.

Lobe Lift:
Intake: .234" Exhaust: .230"

After doing the math I came up with these seat-to-seat timing specs:
Intake:
Opens: 14.5 deg. BTDC
Closes: 54.5 degrees ABDC

Exhaust:
Opens: 61.0 deg. BBDC
Closes: 5.0 degrees ATDC

They're not far off from the regular Crower Stage 2 specs, but the Turbo cams have 1* more duration on the intake side. These cams also have more lift and less overlap than the original Crower2, which will allow you to get all that boost in there without as much blowing through.

In my opinion, these Crower2-Turbo's are much more suited for a turbo application than the Crane 14's (turbo grind), Crower2's, or Crane10/12's.

The program (DeskTop Dyno2000) shows it to be a little less powerful than the Crower2's or Crane12's NA (which I believe is due to the less overlap):


Figuring in a turbo is strange with this program, but here's what I came up with:


Eventhough they show the same, I think on an actual dyno, the Crower2-Turbo will perform better.

+1* Intake Duration + More Lift + Less Overlap = Greater cylinder pressure when turbo'd.

~Luke
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1969 Cougar - 11.91 - 380HP
2007 GSXR 750
1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot

  

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Camshaft discussion & comparison (Continued) [View all] , cougar694u, Apr-25-05 07:52 AM
  RE: Camshaft discussion & comparison (Continued), TeamDeanoD, May-30-05 09:00 AM, #1
RE: Camshaft discussion & comparison (Continued), WIDECLIPSE, Jun-06-05 11:00 AM, #2
RE: Camshaft discussion & comparison (Continued), TeamDR1665, Jun-07-05 06:53 AM, #4
RE: Camshaft discussion & comparison (Continued), Global Ruler Of All ThingsDarkOne, Jun-07-05 06:11 AM, #3
      RE: Camshaft discussion & comparison (Continued), CarbonFiberRST, Jun-14-05 04:31 PM, #5
           RE: Camshaft discussion & comparison (Continued), cougar694u, Jun-15-05 07:21 AM, #6
                RE: Camshaft discussion & comparison (Continued), JWoodley, Jul-10-05 06:39 AM, #7
                     RE: Camshaft discussion & comparison (Continued), CarbonFiberRST, Jul-10-05 12:18 PM, #8
                          RE: Camshaft discussion & comparison (Continued), WIDECLIPSE, Jul-11-05 03:10 AM, #9
                               RE: Camshaft discussion & comparison (Continued), cougar694u, Jul-11-05 04:23 AM, #10
                                    RE: Camshaft discussion & comparison (Continued), WIDECLIPSE, Jul-11-05 05:54 AM, #11
                                         RE: Camshaft discussion & comparison (Continued), cougar694u, Jul-11-05 08:01 AM, #12
                                              RE: Camshaft discussion & comparison (Continued), WIDECLIPSE, Jul-11-05 11:57 AM, #13
                                                   RE: Camshaft discussion & comparison (Continued), cougar694u, Jul-13-05 02:59 AM, #14
                                                        RE: Camshaft discussion & comparison (Continued), Teamner947, Jul-13-05 11:10 AM, #15
                                                             RE: Camshaft discussion & comparison (Continued), TeamMichael_97RS, Jul-14-05 11:15 AM, #16

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