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Old 08-26-2003, 01:34 AM
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good cams, bad cams

whats brand cams are good and what ones are bad? a comp cams 268h or even 270h was reccomended to me to use on short track (racing on ice). I asked the guy what kind of cam would be "old skool" since I'm using dec headers. I'd want the sound to fit with early 70's performance. lol, I know that sounds funny but I'm in to a retro theme for this years race car! some money is going to be invested in this engine and I'd hate to buy a cheap cam thats known to break under high heat, sudden high torque situations and ruin the whole engine.
check out my video's on my yahoo group if ya can and you will see what I'm talking about. oh yea, join to!




http://groups.yahoo.com/group/half_fast/

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Old 08-26-2003, 09:24 AM
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I like comp cams, and the only one that failed on me was my fault (low oil press.). Other than that, I've never heard of any problems with them. Crane is also a very reputable mfgr.
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Old 08-26-2003, 01:39 PM
E.T. divided by $ spent= Speed
 
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I actuall heard a string of bad things about Competition cams and I was very leary when I put in my EX262 but so far so good.
I've had good luck with the summit cams and cleveite too.
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Old 08-26-2003, 06:59 PM
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allright I'm convince to go with comp cams. I'm concerned about the idel though, what does a 270 sound like? is it pretty rough? I need a good distinct idle. I will be reaching some pretty high rpms with the engine. but I dont want to go to high because I'm using stock valvetrain.
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Old 08-26-2003, 07:23 PM
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A 270 probably won't have the idle your looking for. I have a 278 duration cam and it has a really good ilde. A 280 has a good lumpy idle too. Alot of people think I have a big block in my truck by the way it sounds. Most cam dealers will have the specs on the cam. Just look for good idle to lumpy idle.
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Old 08-27-2003, 12:35 AM
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where do you get a 278? I looked up comp cams website and they had a sound byte of an xm 278 and it sounds good to me!!! I just cant find a place that sells that one....
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Old 08-27-2003, 12:53 AM
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That 270magnum should be a little rough.I have the EX262 218/224@050 and evan it has a noticable lope,kinda like the old 327 vette cam.
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Old 08-27-2003, 09:31 PM
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I have a single pattern 278 Energizer cam from Crane. I was thinking of stepping down to a 262 or a 268 dual pattern cam. Let me know if you are interested in a slightly used 278 cam.
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Old 08-28-2003, 01:44 PM
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what are the specs on that and what do you want for it?
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Old 08-28-2003, 02:18 PM
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I ran a comp 280magnum in my BBC, and it was a great sounding cam. Nice lumpy idle. It liked higher rpms, but still wasn't an all out race cam. I don't know if it's the same with a SBC, but I used the stock valve train with it with no problems (but used roller rockers).
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Old 08-28-2003, 02:20 PM
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Good to fair idle, daily performance usage, good mid-range torque and HP, mild bracket racing, auto trans w/2500+ converter, 2700-3200 cruise RPM, 9.5 to 10.75 compression ratio advised. Basic RPM 2400-5400

Advertised duration is 278/278, duration @50 is 222, lobe separation is 110 and lift is .467/.467.

I would like to get at least $30 for the cam. Let me know if your interested.
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Old 08-28-2003, 02:54 PM
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I found a movie of a vette idling with the 270H cam, but you need Quicktime to see it.
http://www.c3sharktank.com/sound/OpenPipes.mpa

XE262H - http://www.thirdgen.org/newdesign/so...k/tasound3.wav
278H- (I think the engine needs some tuning up)http://www.thirdgen.org/newdesign/so...agga/nagga.mp3

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Old 08-28-2003, 09:27 PM
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Some of the racers in my area have nothing good to say about comp cams. They say they always break at the rear most cam lobe. It appears that it's more than just a bad blank but more of where they are getting the materials to grind cams. I should think they would be okay for street use. Even for power levels up to 450 horse. I don't personally use them but I don't think I will untill the word get's better than it's been. I repeat, This is only hear say.
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Old 08-29-2003, 01:11 AM
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ok, really like a 278, but I like the 270 also, both sound pretty old skool but I've never used a cam before and it sounds like it's gonna die if I floor it. could that happen? remember I'm using everything else completely stock. and whats the difference between dual pattern and single pattern?

Last edited by jackflash; 08-29-2003 at 01:19 AM.
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Old 08-29-2003, 11:13 AM
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Single pattern cams have the intake and exhaust lobes ground to the same spec. Dual pattern or split pattern cams have one or the other ground on different specs. Often timed with more duration on the exhaust side to help crutch the production heads inability to flow well enough. Or in a nitrous injected engine the nitrous makes a fair more exhaust then normal, necessitating the need for a longer cyl. blow down period.
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