|
Re: Cam choice for 505 to run 10.50's
[Re: Sport440]
#2007517
02/07/16 07:17 PM
02/07/16 07:17 PM
|
Joined: Mar 2009
Posts: 2,463
Sydney,Australia
tex013
OP
top fuel
|
OP
top fuel
Joined: Mar 2009
Posts: 2,463
Sydney,Australia
|
Tex [/quote]
I agree, if those were my only choices, I would run the smallest, the Howards cam.
But, what do you mean that all those cams were ground on a 104 Intake centerline.
Cams are grounds at A LSA and not at a Intake centerline. They are installed at a specific ICL
You stated differences of 110-108-106 LSA for the three separate cams. Im sure they weren't all ground on a 104 LSA Did , you mean a recommended installed 104 ICL
Also, I wouldnt use any of the cams you listed for what your doing. The hughes cam listed 6872 would be better IMO too.
[/quote]
Yes the Howards is 104ICL installed , all cams are installed 4 degrees advanced ICL over the lobe separation .
Tex
New best ET 10.259@129.65 .
New best MPH 130.32
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive
|
|
|
Re: Cam choice for 505 to run 10.50's
[Re: tex013]
#2007532
02/07/16 07:39 PM
02/07/16 07:39 PM
|
Joined: Jan 2003
Posts: 14,497
So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,497
So. Burlington, Vt.
|
I guess I'll leave it with this......
Go to some of the on line dynamic compression calculators and see what those long duration cams and 10.5cr add up to...... And see if that number resonates in your mind as something that's going to make big power.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
|
|
|
Re: Cam choice for 505 to run 10.50's
[Re: Roadrunner451]
#2016326
02/20/16 10:51 PM
02/20/16 10:51 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
I'll apologise for bringing this back up, but I find this a very interesting topic. I'm sure I'm not the only one as there are a lot of people in a similar situation. Having some people post with real world experience and have guys who do this sort of thing as a living has been pretty interesting. But there's a couple of things I was curious about.
Would it not make sense to run a bit more duration, but keep the lobe centers kind of on the tight side to keep the dynamic compression up ?
Run as much lift as you think you can tolerate ? I would think this would be up to the individual though.
Is more exhaust duration needed on a street/strip car even if it has a good exhaust system ?
Just some things I'm thinking about for my own car as well. I've had two reccomendations from two different cam grinders, and they are considerably different. The one I received had a lot of duration and a wide lobe center. Not really getting the wide lobe center thing at all.
You would have to state what your gonna do with the car and all the specs to the engine.. a wide LSA will give a flatter torque curve but the narrow one will give more bottom end torque... where do you need it at.. if its a street/strip you might want the wider LSA but advance the cam 
|
|
|
Re: Cam choice for 505 to run 10.50's
[Re: Roadrunner451]
#2016366
02/21/16 12:07 AM
02/21/16 12:07 AM
|
Joined: Mar 2009
Posts: 2,463
Sydney,Australia
tex013
OP
top fuel
|
OP
top fuel
Joined: Mar 2009
Posts: 2,463
Sydney,Australia
|
Roadrunner451 ,
Yes getting the most input can help . After running dynamic comp numbers like Fast said , it appears i will need to aim for around 60deg ABDC or less to gain/retain good compression . With my numbers there was nearly 1 point of compression between cam choices .As to tight lobe seperation i understand this to make the motor power peakier , wider is flatter/broader . Still waiting for my short so on hold .
Tex
New best ET 10.259@129.65 .
New best MPH 130.32
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive
|
|
|
Re: Cam choice for 505 to run 10.50's
[Re: Project kickin A]
#2016645
02/21/16 04:24 PM
02/21/16 04:24 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
|
I run a 585 260@ 50 installed at 104 fast ramp Engle flat tap solid in a std RB 446 with sidewinder heads, hooker fender exits with a M1 and 1090 BG it went 10.55 last weekend, foot brake glide nothing too radical
At what weight, gear & stall speed? My old combo was 266 at .050" / .600" / 108 LSA + 4 SFT Comp grind from Porter Racing Heads, 452 RB w/ ported Stage VI heads (10.70 CR & 93-oct E10 fuel), BG 4150 carb, 2" headers & full exhaust, 4.10s & 4500-flash converter... ran 10.5s at 3750+ #s at near sea level tracks, and 2-3 tenths slower in summer heat and higher altitude tracks. IMO, the OP doesn't need a "big" cam to run his posted #, just one that's a good fit for the rest of the combination. The Hughes 6872 on 108 LSA looks reasonable to me, too. As always... just my opinion. 
|
|
|
|
|
Wider LSA on race cams looses bottom end and gains top end, same thing on tighter LSA, more bottom end and looses high HP and RPM in each gear 
