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 Post subject: Comp Cam Info
 Post Posted: Fri Feb 05, 2010 11:21 pm 
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Joined: Wed Oct 24, 2007 6:36 pm
Posts: 718
Location: Blanco, Texas
I am building a 555 BBC.
I'm wondering how hard the cam is going to be on the springs. I've called and emailed Comp Cams with no response.

The info I have on the cam is, it's a custom grind.

From the person I bought the cam from:

Comp CB475 1828B/405/R 114

281/302 @ .050 .824/.782 Lift

Lash .020/.026 Net lift .804/.756

Int CL 112 Installed @ 110


From the end of the cam:

47/82b/405/RR 114

4/7S
CC R

(STAMPED) 3300026

E8280-05

Anyone have any info or advise will be appreciated.

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 Post subject: Re: Comp Cam Info
 Post Posted: Sat Feb 06, 2010 9:32 pm 
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Joined: Mon Oct 29, 2007 7:07 pm
Posts: 1422
Location: Florida
Intake lobe is 33 MI, exhaust is 40. Not real bad, mine is 28 MI. O:) With good springs you should be fine, unless you want to spin 8500+.


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 Post subject: Re: Comp Cam Info
 Post Posted: Sun Feb 07, 2010 9:18 am 
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Joined: Sat Nov 03, 2007 4:44 pm
Posts: 1423
Location: Clawson, Mi.
I would recommend P.S.I. springs in either the double with a flat dampner in the middle or (get a set of triples if you rpm is going over 7500), and a spring diam. of 1.62 or larger, that should handle what ever this cam has and then some... I run 1.64 diam P.S.I. triples and I buzz to 8000 rpm's and I have shaft rockers too, lil ol 505. I check my springs often, and usually when I set and check my rocker arm clearance's. I also do a spring psi test with the Moroso gauge. Hope this helps.

John

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 Post subject: Re: Comp Cam Info
 Post Posted: Tue Feb 09, 2010 9:20 pm 
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Joined: Wed Oct 24, 2007 6:36 pm
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Location: Blanco, Texas
Thanks for the info guys,
I've been reading up on the "intensity" of the lobes, new info for me. I guess I'll just run the combo as I bought it. BB2 Xtras that flow 429 @ .800 int and 308 @ .800 exh, also a Super Victor with a 1050 Dominator. As a 565 with 14.5 compression it dynoed at 956 hp @ 7200 rpm, 775 tq @ 5600 rpm. It will be a 555 this time (new block, wanted to leave room for a couple of rebuilds). The car and driver weigh 2800# with 4.56 gears and 14 X 32's and I want to run in an 8.50 index class.
Think it will run the number?

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 Post subject: Re: Comp Cam Info
 Post Posted: Wed Feb 10, 2010 8:11 am 
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Location: N.J.
Donee, thinking your going to need a bigger tire or less gear....depends on how much you want to spin it....Also thinking your going to need a 9" converter... #-o

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 Post subject: Re: Comp Cam Info
 Post Posted: Thu Feb 11, 2010 10:07 am 
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Joined: Wed Oct 24, 2007 6:36 pm
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Location: Blanco, Texas
I have a 9" Hughes convertor, I'll get the numbers and post them, I think it stalled around 5500 behind my 498 ~600 hp (9.50s) . I was trying to keep the rpm under 7500.
Thanks,

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 Post subject: Re: Comp Cam Info
 Post Posted: Thu Feb 11, 2010 2:11 pm 
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Joined: Sat Feb 07, 2009 4:12 pm
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Location: Adelaide Australia
Ive seen a similar car to that spec wise run 8.5's with a bit more power than that, So i dont think it will run the number. If its index racing dont you need to be able to run the number easy? I think it would be on its limit of performance to get that 8.50 so it might not do it on a bad day. Seems to me the carby size would be too small to make the power on low air pressure days. The previous claimed power per CFM head flow is a flow factor of .278 which is on the high side, to do that it has to be efficient at most things. Its claimed to make 956hp on 565 cubes 'thats downgraded to 939hp on 555 cubes and its making 1.69 hp per cube. Humm seems a bit low for the overall package to me indicating it's not that efficient. So to me it doesn't quite add up with confidence. But it will go better than the old combo thats for sure.


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 Post subject: Re: Comp Cam Info
 Post Posted: Thu Feb 11, 2010 9:49 pm 
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Location: Blanco, Texas
Well my original goal when I stepped up to this engine was to run 8.70's in the heat of summer, so I could run the 9.0 index. So I may be reaching for a little more performance than I should be, it isn't the first time. It'll be interesting where it ends up, thats the fun in it. Thanks for your input.
Any other thoughts are welcome.

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