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Username Post: going roller cam but which one?        (Topic#197350)
PhatOne 
Senior Member
Posts: 514
PhatOne
Loc: Dallas, Tx, USA
Reg: 12-13-01
08-26-08 07:31 PM - Post#1508539    

ok guys i am looking to move from flat tappet cam to hydrolic roller. i am looging at 2 cams right now but if you have any other suggestions let me know. this truck is a weekend cruiser and occasional track trip. i am looking for more performance than the comp cam magnum 286 flat tappet cam i have in it now 286 magnum cam card . looking for the best all around cam. also what kind of power improvement can i expect from the cam over flat tappet and its current cam

the cams i am looking at are


xr288hr cam card
Comp Cams part #08-433-8
Xtreme Energy XR288HR
Hydraulic Roller-street/strip applications
RPM range: 2500-6000
Lobe center angle: 110
Intake centerline: 106
valve timing: 0.006
Duration: Intake-288 Exhaust-294
Duration @ .050" lift: Intake-236 Exhaust-242
Valve lift: Intake-0.52 Exhaust-0.54
Lobe Lift: Intake-0.347 Exhaust-0.36



Cam Card xr282hr
Comp Cams part 12-432-8
Xtreme Energy XR282HR
Hydraulic Roller-street/strip applications
RPM range: 2200 to 5800
Lobe center angle: 110
Intake centerline: 106
valve timing: 0.006
Duration: Intake-282 Exhaust-288
Duration @ .050" lift: Intake-230 Exhaust-236
Valve lift: Intake-0.51 Exhaust-0.52
Lobe Lift: Intake-0.34 Exhaust-0.347



this is going in a SWB 84 chevy truck with a 12 bolt and 3.73 gears a turbo 350 tranny and 2600 stall.

the motor specs are

383 SBC
10.2:1 compression
dart iron eagle 200cc heads
edelbrock performer rpm air gap intake
holley 750 DP
1.5 roller rockers
headman long tube headers
2.5 inch exaust with 2 chamber flow masters


 
yellow heap 
Newbie
Posts: 4

Reg: 08-26-08
08-26-08 08:25 PM - Post#1508575    
    In response to PhatOne

I run a 10.3 383 with 195 afr's and the xr282hr.
rpm air gap
650 demon dp
richmond 5
3.31 gear
I love it in my chevelle.
In a light car the 288 would be nice but its best to be a bit coservitive
In a heavier truck the 282-hands down

Edited by yellow heap on 08-26-08 08:29 PM. Reason for edit: No reason given.

 
smasher0219 
Senior Member
Posts: 863

Loc: joisey
Reg: 06-09-03
08-27-08 02:27 PM - Post#1509056    
    In response to yellow heap

Comp is trying like hell to get rid of its 288. If you run the camquest program, it will give ridiculous numbers compared to much larger cams with a tighter LSA. How can anyone trust that program.

That said the 288 is probably the better of the 2 choices you have listed.

 
PhatOne 
Senior Member
Posts: 514
PhatOne
Loc: Dallas, Tx, USA
Reg: 12-13-01
08-27-08 09:53 PM - Post#1509389    
    In response to smasher0219

2 replies and 2 different answers. wow what to do. any others to chime in


 
boogie 
Senior Member
Posts: 2137
boogie
Loc: Louisiana
Reg: 07-11-02
08-28-08 05:17 AM - Post#1509462    
    In response to PhatOne

I would get Comp to custom grind one on a billet core with the XFI lobes. Intake lobe # 3016 and Exhaust lobe # 3037.

Intake 280/230 .540 lift with 1.5
Exhaust 288/236 .536 lift

On a 108º LSA

May need to upgrade your spring/retainer package.
'85 GMC C1500 SWB 355 sbc


Edited by boogie on 08-28-08 05:21 AM. Reason for edit: No reason given.

 
rumrumm 
"13th Year" Silver Supporting Member
Posts: 1868
rumrumm
Loc: Macomb, IL
Reg: 10-18-01
08-28-08 05:49 AM - Post#1509474    
    In response to PhatOne

Since this is primarily a street cruiser, I would lean toward the smaller of the two cams. And I would advise using a rev kit so you can get more rpm out of your hydraulic rollers.
Lynn

"There's no 12-step program for stupid."


383 sbc, Eagle, AFR, SRP, CompCams, Edelbrock, Sanderson. Dyno #'s: 450 hp @ 5700, 468 ft. lbs. torque @ 4300.

http://photo.net/photos/Lynn%20Johanso n


 
PhatOne 
Senior Member
Posts: 514
PhatOne
Loc: Dallas, Tx, USA
Reg: 12-13-01
08-28-08 02:26 PM - Post#1509805    
    In response to rumrumm

i am trying to get a solid 450hp out of the motor. so will one of the 2 cams i listed get me there?

i know to error on the small side but if the 288 will get me there i am for it. but if the smaller one gets me there then i would prefer that one


 
smasher0219 
Senior Member
Posts: 863

Loc: joisey
Reg: 06-09-03
08-28-08 02:40 PM - Post#1509814    
    In response to PhatOne

There is a very small difference between those 2 cams, and chances are that either one will get you between 420-450 at the crank. If you want 400+ at the wheels, you need a cam with a tighter LSA like a 108. The problem with that is that you lose some torque under 4k, and would have to rev it to 6500+ to get the full benefits.

Also, rumor has it that small base circle roller cams require a long travel lifter since they can fall into the bore and spin. I haven't had that problem yet (knock on wood) .585 lift. And if you look at the prices of those long travel lifters, they definitely aren't on the cheap side.



 
PhatOne 
Senior Member
Posts: 514
PhatOne
Loc: Dallas, Tx, USA
Reg: 12-13-01
08-28-08 07:51 PM - Post#1510039    
    In response to smasher0219

i will be using retro fit lifters with link bar.

i am open to other cams as well. this is just what comp offered.

since it is a truck i think tq is important too.

so you think those cams will get me close to 450 at the crank. if i could get 400 at the wheels i would be in heaven.

keep em comming.


 
bowtie67 
Senior Member
Posts: 658

Loc: Loudon, NH
Reg: 12-06-03
08-30-08 05:19 AM - Post#1511078    
    In response to PhatOne

Try the Crower Hydraulic roller #00471, it makes real nice numbers and is a tourqe monster. I have run it with in a very simular combo I made 500+hp and close to 550tq, specs are 236/240@050 286/292 advertised 562/567 lift, you will fry tires, this is what I run in my 67C10, on DD it made more tq and HP than both the Compcams you mentioned.

 
smasher0219 
Senior Member
Posts: 863

Loc: joisey
Reg: 06-09-03
08-30-08 06:24 AM - Post#1511102    
    In response to bowtie67

On a side note, do the standard retro lifters have enough body on them to NOT bottom out on a small base circle cam? I was told to use long travel only.

 
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