BBC cam question up grade XR288HR
09-14-2017, 11:01 AM
#21
Registered
Surprised no one has mentioned the 500 EFI cam yet. 230/236 .598/.610. This cam works good in my 454's
10-25-2017, 02:53 PM
#23
Registered
Believe someone mentioned it, but that Lunati 20010671 looks like a very nice cam.
Previous Part Number: 54871LUN
Jobber Price: $285.08
- Advertised Duration (Int/Exh): 301/311
- Duration @ .050 (Int/Exh): 242/252
- Gross Valve Lift (Int/Exh): .640/.629
- LSA/ICL: 114/112
- Valve Lash (Int/Exh): Hyd/Hyd
- RPM Range: 3600-6800
- Includes: Cam Only
Previous Part Number: 54871LUN
Jobber Price: $285.08
11-17-2017, 08:59 PM
#24
Platinum Member
Platinum Member
Your existing hydraulic flat specs at 233/241 on 110.
And you are considering a hyd roller at 236/242 on 110?
Your Voodoo has fairly fast ramps for a flat hydraulic and 554/572 lift.
The Comp HR has fairly slow ramps for a HR and 521/540 lift.
Explain to me what sort of improvement you expect from the HR you have selected.
Listen to the crowd here - tight lobe separation does 2 things - makes the torque plot peakier - encourages reversion at idle.
Wider lobe separation does the reverse - flattens the torque plot - discourages reversion at idle.
I absolutely LOVE a tight lobe center in a stickshifted street/strip car. Throttle response is awesome, power comes on like gangbusters - DEFINITELY "less civilized" than a wide lobe center.
We are running a flat hydraulic on a 104 lobe separation in a Mopar 440 and it is a brutal dude compared to a similar B-body 440 that is running a 112 separation cam with similar compression, heads, induction, and duration.
But cars don't have water reversion problems.
And you are considering a hyd roller at 236/242 on 110?
Your Voodoo has fairly fast ramps for a flat hydraulic and 554/572 lift.
The Comp HR has fairly slow ramps for a HR and 521/540 lift.
Explain to me what sort of improvement you expect from the HR you have selected.
Listen to the crowd here - tight lobe separation does 2 things - makes the torque plot peakier - encourages reversion at idle.
Wider lobe separation does the reverse - flattens the torque plot - discourages reversion at idle.
I absolutely LOVE a tight lobe center in a stickshifted street/strip car. Throttle response is awesome, power comes on like gangbusters - DEFINITELY "less civilized" than a wide lobe center.
We are running a flat hydraulic on a 104 lobe separation in a Mopar 440 and it is a brutal dude compared to a similar B-body 440 that is running a 112 separation cam with similar compression, heads, induction, and duration.
But cars don't have water reversion problems.
