Cam Comparison - Thoughts?
#1344853
12/02/12 08:49 AM
12/02/12 08:49 AM
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Joined: Mar 2010
Posts: 1,880 Out in Left Field, NY
bobs66440
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I'm currently running the Summit 6401 cam with (9.35.1) 282/292 adv duration .465/.488 lift 114 LSA (calls for min. 9.5:1 compression but seems to work very nice) Comp recommended the 268H (21-223-4) 268/280 adv duration .477/.480 lift 110 LSA Why/is the Comp cam better for my setup for street driving. What are the differences in characteristics? The reason why I'm asking is, I have to change the cam & lifters due to a bad lifter issue (long story ). Putting in a different cam may open up a can of worms with lifter preload and I don't want to go through ordering a new set of pushrods again. If I'm not going to notice a difference, it won't be worth the hassle. I might as well put another 6401 cam in...
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Re: Cam Comparison - Thoughts?
[Re: bobs66440]
#1344855
12/02/12 10:11 AM
12/02/12 10:11 AM
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Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
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I don't think you would see any difference in performance the comp cam will give an ever so slightly rougher idle and a bit more and a tiny bit more hp.
Why would lifter pre load be enough difference to worry about they are most likely ground on the same base circle unless summits is a smaller chevy size.
Last edited by Dodgem; 12/02/12 10:15 AM.
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Re: Cam Comparison - Thoughts?
[Re: Dodgem]
#1344857
12/02/12 11:15 AM
12/02/12 11:15 AM
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Joined: Mar 2010
Posts: 1,880 Out in Left Field, NY
bobs66440
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Quote:
Why would lifter pre load be enough difference to worry about they are most likely ground on the same base circle unless summits is a smaller chevy size.
I don't really know much about it. I read that the base circles on cams are different brand to brand so that would effect the lifter preload. I would like to use the Comp cam since I already have it, but I can't get any info on the base circles of each. So I wouldn't know if the preload is effected until I install it. Then it's too late to return...
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Re: Cam Comparison - Thoughts?
[Re: bobs66440]
#1344859
12/02/12 12:25 PM
12/02/12 12:25 PM
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Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
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I would use the comp if you have it. there is a standard base circle for most mopar cams I'm sure you are fine. No adjustable rockers? The summit cam is 224/234 @ .050 the comp cam is 224/230 @ .050
Last edited by Dodgem; 12/02/12 02:40 PM.
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Re: Cam Comparison - Thoughts?
[Re: lewtot184]
#1344860
12/02/12 03:14 PM
12/02/12 03:14 PM
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Joined: Feb 2005
Posts: 4,319 Prospect, PA
BSB67
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Quote:
...the comp cams 268, with 110lsa and 4 degrees of advance ground into it,will give more low end torque but horsepower will peak sooner. it's more aggressive lobes are more failure prone. the summit cam with its 114lsa will have a more gentle torque curve, probably no big difference in horsepower compared to the 268....
These cams will be very close in power output. The power curve will just be shaped a little different. The advertised numbers do make a difference but if the manufacturers are not using the same lobe lift standard it makes the comparison difficult. But even with that, these to cams are close. The Comp will probably be a little sharper down low but the Summit will be a little flatter after peak power. you'll probably have valve train noise with the Comp, if that matters to you.
You really won't know if one makes more power than the other unless you are doing some very controlled before and after track testing.
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Re: Cam Comparison - Thoughts?
[Re: BSB67]
#1344861
12/02/12 04:28 PM
12/02/12 04:28 PM
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Joined: Mar 2010
Posts: 1,880 Out in Left Field, NY
bobs66440
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Thanks for all the replies. I would like to use the Comp cam based on the response, but what scares me is the comment "more aggressive lobes are more failure prone". Hey, I'm all for more power but I have enough problems with the MILDER cam. I don't want to have to go through this again soon... Valve train noise doesn't bother me as long as I know it's normal... I'll have to put some more thought into it....
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