Re: BB roller cam recommendations
[Re: rick4106]
#2570082
10/27/18 02:02 AM
10/27/18 02:02 AM
|
Joined: Aug 2003
Posts: 43,096 Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,096
Bend,OR USA
|
Last edited by Cab_Burge; 10/27/18 02:03 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: BB roller cam recommendations
[Re: BradH]
#2570152
10/27/18 11:26 AM
10/27/18 11:26 AM
|
Joined: Jan 2003
Posts: 14,491 So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,491
So. Burlington, Vt.
|
Max Wedge or standard ports?
What's the peak RPM the engine sees on the track?
What's the converter stall speed? And, what rockers arms...... and what ratio?
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
|
|
|
Re: BB roller cam recommendations
[Re: rick4106]
#2570236
10/27/18 03:21 PM
10/27/18 03:21 PM
|
Joined: Feb 2013
Posts: 84 La.USA
rick4106
OP
member
|
OP
member
Joined: Feb 2013
Posts: 84
La.USA
|
Hs 1.5 harland sharps and max wedge port. Only made couple of passes with .650 lift 290@.050 old comp solid. 6.35@108.9.97@131 in 1/4.
Last edited by rick4106; 10/27/18 03:23 PM.
|
|
|
Re: BB roller cam recommendations
[Re: rick4106]
#2570257
10/27/18 04:14 PM
10/27/18 04:14 PM
|
Joined: Jan 2003
Posts: 30,989 Oregon
AndyF
I Win
|
I Win
Joined: Jan 2003
Posts: 30,989
Oregon
|
290@050 is way too big for your combination. That cam is killing the torque and slowing you down. Sometimes bigger is not better. I think the 292 street roller would work or you could go one size bigger with a 260@050 intake lobe.
Looks like you're crossing the stripe at roughly 7000 rpm with those gears. With a better cam you should be going faster so you most likely will need to drop the rear gear down to 4.56 or even a 4.30.
A 440 with ported EZ heads and 12:1 compression should make 650 to 700 hp if you have a good intake manifold. That would put you into the low 9's at 140+ mph if the chassis is decent. So I'd gear the car to go 7000 rpm at 145 and then pick a cam that puts peak power around 6800 rpm. 260 @ 050 should be in the ballpark. Probably need 5000+ stall on the converter but I'm no expert there.
Last edited by AndyF; 10/27/18 04:15 PM.
|
|
|
Re: BB roller cam recommendations
[Re: rick4106]
#2570263
10/27/18 04:18 PM
10/27/18 04:18 PM
|
Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
I Live Here
|
I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
|
Hs 1.5 harland sharps and max wedge port. Only made couple of passes with .650 lift 290@.050 old comp solid. 6.35@108.9.97@131 in 1/4. I run an Isky solid roller in my 470 low deck with home ported rpm's and .680-.660 and 276-281 @ .050 and it has many street miles and a few passes with a 6.15 @ 112+ so far on crap QTP's.............
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
|
|
|
Re: BB roller cam recommendations
[Re: rick4106]
#2570268
10/27/18 04:41 PM
10/27/18 04:41 PM
|
Joined: Oct 2015
Posts: 570 UK
rb446
mopar
|
mopar
Joined: Oct 2015
Posts: 570
UK
|
My mate's 440 Dart made 600hp with 320cfm Eddy's, old .590 sft purple@12.5:1, 1050 Dom etc. Working on your no's, 2811lbs/9.97@131 your only making 560hp, something wrong, you should be up in the 640+hp range with those speccs, I don't think its the .290@.050 cam personally....I made 530hp with that cam@9.8:1 an 850DP and 260cfm 906's back in the day.
Last edited by rb446; 10/27/18 04:48 PM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
|
|
|
Re: BB roller cam recommendations
[Re: rick4106]
#2570333
10/27/18 08:08 PM
10/27/18 08:08 PM
|
Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
|
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
|
Hs 1.5 harland sharps and max wedge port. Only made couple of passes with .650 lift 290@.050 old comp solid. 6.35@108.9.97@131 in 1/4. My perspective is a bit simplistic, but MW ports, that much duration, and only 450-ish cubes is killing your torque. Add my vote to those who are suggesting you should try something 20 to 30 degrees smaller. If you're going to switch to a roller, you might even be able to pick up some lift, too.
|
|
|
Re: BB roller cam recommendations
[Re: rick4106]
#2570406
10/27/18 11:11 PM
10/27/18 11:11 PM
|
Joined: Jan 2003
Posts: 14,491 So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,491
So. Burlington, Vt.
|
While I’ve never been a big fan of the 650/290 solid, it did have its place. But imo that place isn’t MW sized Indy heads on a 440.
That being said, I think the xr292r is too much of a step in the other direction. Sure, it’ll work okay......... but I don’t feel that cam in that combo is going to make the best use of a roller set up in a 12:1 bracket car with decent heads.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
|
|
|
Re: BB roller cam recommendations
[Re: AndyF]
#2570638
10/28/18 04:15 PM
10/28/18 04:15 PM
|
Joined: Jan 2003
Posts: 5,484 SoCal
Brian Hafliger
master
|
master
Joined: Jan 2003
Posts: 5,484
SoCal
|
Looks like it's laying down after the first 1/8...mph is down alot compared to the 1/8 mph.
What does it 60ft.? Fuel system?
Brian Hafliger
|
|
|
Re: BB roller cam recommendations
[Re: rick4106]
#2570725
10/28/18 09:04 PM
10/28/18 09:04 PM
|
Joined: Jan 2003
Posts: 14,491 So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,491
So. Burlington, Vt.
|
No real benefit to limiting yourself to what’s available in a catalog.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
|
|
|
Re: BB roller cam recommendations
[Re: AndyF]
#2579338
11/16/18 10:08 PM
11/16/18 10:08 PM
|
Joined: May 2004
Posts: 1,522 Ste-Sophie, Quebec, Canada
Wedgeman
pro stock
|
pro stock
Joined: May 2004
Posts: 1,522
Ste-Sophie, Quebec, Canada
|
That would most likely work better than what the OP has now but my guess is that it is still 10 degrees too big. I tried a 270@050 cam in my 470 with TF heads and it was too big. That engine worked best with cams in the 260 range. The OP engine is a little smaller but has a bit more compression. My guess is the OP's engine will work best with a cam in the 260's. As a reference, Dyno Sim gives me the best numbers with a 270/276 at .050 for my 12.5cr 470.....
|
|
|
Re: BB roller cam recommendations
[Re: Wedgeman]
#2579349
11/16/18 10:21 PM
11/16/18 10:21 PM
|
Joined: May 2008
Posts: 1,131 Thigh-Gap Junction
@#$%&*!
New user name, Same old jerk!
|
New user name, Same old jerk!
Joined: May 2008
Posts: 1,131
Thigh-Gap Junction
|
As a reference, Dyno Sim gives me the best numbers with a 270/276 at .050
for my 12.5cr 470.....
Does the simulator consider head flow? Does it give different results for flat-tappet vs. roller cams?
|
|
|
Re: BB roller cam recommendations
[Re: rick4106]
#2579402
11/17/18 01:08 AM
11/17/18 01:08 AM
|
Joined: Jul 2013
Posts: 561 USA
B3RE
mopar
|
mopar
Joined: Jul 2013
Posts: 561
USA
|
Yes something in the combo is not working. My dart has a 446 with Sr heads that flow 290 and has a .557 mopar cam, speed pro pistons and a 750 carb. That car 6runs 6.60s @ 3300 A 290@.050 cam and Max Wedge port with only 446 cubes means you should be turning a lot of rpm to make power. Like ou812, I don't think it's making power on top. My first suspect when I see this is valvetrain instability, and may be why it's laying down. The bottom might be a bit soft from the big cam, but you could crutch that a bit with the converter. But, if it won't rev, that's an exercise in futility. Make sure the rocker geometry is right so the valvetrain stays stable, no matter what cam you choose to go with.
Mike Beachel
I didn't write the rules of math nor create the laws of physics, I am just bound by them.
|
|
|
Re: BB roller cam recommendations
[Re: rick4106]
#2579493
11/17/18 11:51 AM
11/17/18 11:51 AM
|
Joined: Jan 2003
Posts: 9,982 Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
|
master
Joined: Jan 2003
Posts: 9,982
Frostbitefalls MN (Rocky&Bullw...
|
If the motor is 446 cubes and has 2.19 intakes, Vizards LSA chart asks for a lobe seperation that is rather tight. 104! If a single pattern 270 @ .050 cam is ground that way, the overlap at .050 would be 62 degrees, letting the motor breath. I definately don't have enough experiance to pick a cam that is perfect here, but looking at 62 degrees overlap combined with no more than 270 @ .050 total duration in straight up will allow a resonably early intake closing of 59 degrees ATDC. Sounds logical to me. Use a 6,000 + stall minimum due to the glide, shift it at 7,000?
Last edited by gregsdart; 11/17/18 11:52 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
|
|
|
Re: BB roller cam recommendations
[Re: rick4106]
#2579541
11/17/18 01:40 PM
11/17/18 01:40 PM
|
Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
|
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
|
Hs 1.5 harland sharps and max wedge port. Only made couple of passes with .650 lift 290@.050 old comp solid. 6.35@108.9.97@131 in 1/4. I don't have "the" answer for you, but can give you something to think about. My RB 452 has less compression (11.5) and standard ports, but comparable flow #s. Dwayne Porter spec'd a 265 at .050 x .650" on 108 LSA solid roller, which made peak torque at 5100 and peak HP at 6900. Your MW ports would probably push the peak torque & HP RPMs up 300-400 over mine. I don't recall what you may have for converter stall or what RPM you're willing to spin your engine, but you may be able to better predict what size cam suits your combination based on this.
|
|
|
|
|