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Old 06-05-2013, 10:45 AM   #1
fastfreddie

 
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Mild Cam vs BIG Cam?

I've been reading and studying about CAM's and there seems to be alot of talk about Mild Cam's for DD's and then BIG Cam's for more HP. I've done some searching but haven't found an answer to what I'm looking for.

I'm assuming a Mild Cam is somewhere around 231/236. What is considered a BIG Cam? Also, what are the pros and cons to a BIG Cam?

Thanks for the help!
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Old 06-05-2013, 10:48 AM   #2
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If i'm not mistaking a big cam will require a higher stall which will take away the street ability. I don't think that is the only pro/con. I'm subscribing to see tho as I am looking into a cam soon as well.

Did me beating you on the dyno make you want to do this? lol jk
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Old 06-05-2013, 10:55 AM   #3
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I have a 223/236 59X-60X. I'm not sure where the line is drawn for mild-wild. There was a thread a while back debating different size cams and what category that fall into. As far as stall I think the dyno graph kinda tells you what stall you will need.
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Old 06-05-2013, 10:56 AM   #4
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Quote:
Originally Posted by fastfreddie View Post
I've been reading and studying about CAM's and there seems to be alot of talk about Mild Cam's for DD's and then BIG Cam's for more HP. I've done some searching but haven't found an answer to what I'm looking for.

I'm assuming a Mild Cam is somewhere around 231/236. What is considered a BIG Cam? Also, what are the pros and cons to a BIG Cam?

Thanks for the help!
The TSP 231/236 isn't a mild cam if that's the one your talking about. A mild cam is just a cam that has less duration and less lift. Less duration means that it will idle better and drive better at low RPM. Less lift will be easier on your valvetrain. What you should buy all depends on what you're hoping to get out of the cam. The 231/236, G6X3, Night Fury, etc.. are all big cams.

I'm not the one to be answering from an auto tranny point of view as I have an LS3.
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Old 06-05-2013, 10:58 AM   #5
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Check this out it will be informative at the least

http://www.camaro5.com/forums/showthread.php?t=290089

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Old 06-05-2013, 10:58 AM   #6
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Lumpy idle is caused by low vacuum. Basically the engine want's to stall. This leads to drivability issues when putting around town.
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Old 06-05-2013, 11:08 AM   #7
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Lumpy idle is caused by overlap; low vaccum is a by product of overlap. I would define the cams listed in this thread (so far) as mild. Anything above 20 degrees of overlap at .50 is considered wilder in my book. Approaching 30 degrees is WILD. The cam in my last car (LS 402 stroker) had 26 degrees of overlap. It took a lot of tuning; but it idled and drove good considering the setup (11.7 cr, 5000 stall, 3.73 gears).
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Old 06-05-2013, 11:16 AM   #8
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Quote:
Originally Posted by fastfreddie View Post
I've been reading and studying about CAM's and there seems to be alot of talk about Mild Cam's for DD's and then BIG Cam's for more HP. I've done some searching but haven't found an answer to what I'm looking for.

I'm assuming a Mild Cam is somewhere around 231/236. What is considered a BIG Cam? Also, what are the pros and cons to a BIG Cam?

Thanks for the help!
There is no black and white answer, it's all relative. Displacement, cylinder heads, operating range, etc all play a role in what cam is needed, and what would be "big" or "small".

Now if you were to narrow it down to say a 376ci LS with LS3 heads, then you can begin define what cams are too big or too small.

Generally speaking, a cam will "rock" the power curve with peak torque being a fulcrum if you will. More duration will hurt lower RPM power, while picking up higher RPM power.
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Old 06-05-2013, 11:21 AM   #9
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Did me beating you on the dyno make you want to do this? lol jk
Absolutely....you really pissed me off!

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Old 06-05-2013, 11:23 AM   #10
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Quote:
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Generally speaking, a cam will "rock" the power curve with peak torque being a fulcrum if you will. More duration will hurt lower RPM power, while picking up higher RPM power.
That's a good way to describe it.
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Old 06-05-2013, 11:26 AM   #11
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Thanks guys for the replies. Great reading APEX Chase's post. I hadn't run across that, not sure why. I think I'll eventually get a handle on this CAM thing. Guess I was misinterpreting what defines a Mild Cam and BIG Cam.

Now I just need to win the lottery!
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Old 06-05-2013, 12:31 PM   #12
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Pros and cons are, when you get the mild cam after a few months or sooner your gonna wish you had the bigger one. Mark my words. Lol
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Old 06-05-2013, 01:06 PM   #13
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Pros and cons are, when you get the mild cam after a few months or sooner your gonna wish you had the bigger one. Mark my words. Lol
Alex told me to never listen to your advice.

J/K
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Old 06-05-2013, 01:16 PM   #14
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Getting my cam and conversion done next week...
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Old 06-05-2013, 01:17 PM   #15
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Getting my cam and conversion done next week...
Congrats man.

What cam are you going with?
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Old 06-05-2013, 01:18 PM   #16
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224-228 dur/.500-.580lft would be mild......236+dur/.590lft+ would be wild. In simple layman's terms.
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Old 06-05-2013, 01:36 PM   #17
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Pros and cons are, when you get the mild cam after a few months or sooner your gonna wish you had the bigger one. Mark my words. Lol
yep but some cams in the .61x range are making good power. my cam is in the .64x range intake 61x exhaust
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Old 06-05-2013, 01:43 PM   #18
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Vengeance Kaotik would be wild! That's what I'm going with. 235/243 .621/.624 113 LSA might as well get the big one so I don't end up doing the install twice.
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Old 06-05-2013, 02:55 PM   #19
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Alex told me to never listen to your advice.

J/K
Lol FINE!! Lol
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Old 06-05-2013, 02:56 PM   #20
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Vengeance Kaotik would be wild! That's what I'm going with. 235/243 .621/.624 113 LSA might as well get the big one so I don't end up doing the install twice.
That cam card is purrrrrttyyy!
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Old 06-05-2013, 03:02 PM   #21
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What's this considered


227/239 613/623 on a 115
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Old 06-05-2013, 03:21 PM   #22
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This is a loaded question as what's big to one person might not be to another. I would say that a lot of people in general go overkill with a big cam, so big that it throws away decent driveability, low and mid range power, all to make a big number up top.

We're big on driveability here, and we want to make cams that you can enjoy throughout the powerband, not just at 5k+, so just about everything we design is like that. We've got some on the smaller side that make great power that you can't even hear, and we've got those that have a nice rumble to them, turn heads, and put down some serious power without sacrificing driveability
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Old 06-05-2013, 04:54 PM   #23
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To me for a stock bottom end:

1) Mild cam, intake and exhaust durations 21x's or 22x's, does not need a stall, max rpm 6500

2) Mid range cam, intake duration 22x's to low 23x's, exhaust max of high 23x's, stall will help

3) big cam, intake as big as it gets for stock, probably 234 ish, exhaust I've seen 247. Will want to be shifted at 7000, need a stall and would like a gear.

Biggest cam I've personally ever run is 240/244.

I'm still trying to understand what cams work for these setups, you have a nice 6.3 liter engine in a 4000 lb car. I don't see how a cam like a 227/239 (just approximate numbers for the sake of conversation) 112 + 2 wouldn't help with the power band from 3000-5000 with a big split, and keep the max rpms down by doing it on a 112. I don't see yet why an appropriately cammed 3200 stall car couldn't run as strong as a big cam car with a gear. At some point the smaller cam would have better mid range I'm thinking.

Just some thoughts.
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Old 06-05-2013, 05:04 PM   #24
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Hey John I've often wondered what your asking. That's one reason I haven't upgraded to a bigger cam. I don't know how my cam will stand up against these big cams. My first run was a 12.4 @ 114 no stall and 2.1 sec 60'. So I'm thinking now that I have my stall and about to add drags I may end up perfectly happy with my small cam.
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Old 06-05-2013, 07:38 PM   #25
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Dan white 2ss is running a GT11 which I don't think is super big, and his car runs pretty good.

Maybe at some point we can find some different dyno sheets and overlay them. Seems to me that if a one cam had stronger mid range it would show up on the graphs.
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