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Thread: anyone ran this cam before?
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09-19-2010, 02:10 PM #1
- Join Date
- Aug 2010
- Location
- Clarksville, Ar
- Posts
- 79
various- 1986 Turbo 944
anyone ran this cam before?
just curious if anyone has ran this cam before. My engine build is setup for it as far as I can tell. I have it installed and the PTV clearance is good. Upgraded everything that is recommended and balanced the lower end. Comp suggested this cam for my style of driving I will be doing.
Just curious if any one has any history with it.
Comp cam 54-428-11 Grind #XR281HR
Hydraulic Roller Lifter
High RPM street strip
RPM Range 2200-7200
Timing .006
Lobe center angle 112
Intake centerline 110
Valve lash is hydraulic on both
Duration intake 281 ex 283
Duration .050" intake 228 ex 230
valve lift intake 0.571 ex 0.573
lobe lift intake .0336 ex 0.337
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09-21-2010, 04:28 PM #2
yes i have in in my car now and didnt even check the PTV that cam is not going to have any issues with PTV
now with 1.8 or higher rockers it make have issues but on a stock ls1 no issue
im running 918s and ive hit my rev limmiter a few times and its at 7000 rpm
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09-21-2010, 05:16 PM #3
- Join Date
- Aug 2010
- Location
- Clarksville, Ar
- Posts
- 79
various- 1986 Turbo 944
Black bird, nothing on the engine is stock, the rocker arms arent 1.8 though they are 1.72. The pistons have -3 reliefs in them.
Also what other mods do you have to allow your rpm range? Valve train? bottom end?
How did you go about tuning the computer after the cam install.
One last thing I am not sure what 918s are, is that 1/4 time? I am not much of a drag racer and have never been to the strip.
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09-21-2010, 09:13 PM #4
- Join Date
- May 2009
- Location
- Lima,ohio
- Age
- 40
- Posts
- 157
White- 2000 trans am
918s he talking bout his springs
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09-21-2010, 09:21 PM #5
- Join Date
- Aug 2010
- Location
- Clarksville, Ar
- Posts
- 79
various- 1986 Turbo 944
ok those are just bee hive springs. I am running 26921 dual springs. I am trying to get a rough comparison about these engines in a chevy to what I should expect out of it for my 944.
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09-22-2010, 06:42 PM #6
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09-22-2010, 06:45 PM #7
o and best so far with this cam has only been 12.4ish but i have not ran it much and not much tuneing time for it
as far as spark timming i keep my old timming tabe that is 28* till 5200 then i kicked it up to 30 * and i have zero KR
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