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Old 07-07-2004, 10:31 AM
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Help me pick a new camshaft!!!

Okay, I've got a new engine in my camaro this year, and I'm not happy at all with the camshaft selection.... I'm sure one of you pros can help me pick a new one... I really want to go solid roller this time... Here's the specs on my car:

383 Stroker
10:1 JE Custom Dished Nitrous Pistons
JE HNS rings (hellfire)
Studded 4 bolt Mains
Scat 4340 Crankshaft
Scat 4340 I Beam rods (7/16"ARP rod bolts)
Dart Pro1 Aluminum 215cc Heads (2.08, 1.60 valves)
Dart Single Plane Intake Manifold
Holley 750 Double Pumper
Hedman 1 3/4" Headers
Comp NX284H Nitrous HP Camshaft (.507i, .525e duration @ .050 240i, 253e, LSA 113.0)
1.5 Full Roller Rockers
TH350 tranny (Hughes GM92 Converter, Transgo full manual shift kit)
Richmond 3.90 gears, Eaton posi....

I really want to swap to a meatier cam... The one I'm using is way too mild. The car does get driven on the street some, but not too often... I do run pretty large doses of nitrous on it.. My best time is 10.77 @ 127.13 on 300 shot (6000 DA)... My opinion is that it should be faster than that on that much nitrous... What camshaft would you guys run with this engine setup??? Anything else I should change??? Your input means a lot to me!!!


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Old 07-07-2004, 11:03 AM
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My first suggestion before swapping to another cam would be to give it some gas, I would step up to a 850 carb first and go from there. Your running a very respectable time for a camaro, being there not flyweights by any means.
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Old 07-07-2004, 11:24 AM
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cam

Is that 10.1 compression a guess or did you cc everything and find out what it really is.... If not do you remember how much dish was on those pistons?? What was the deck height????

What are your 60' times 330' times 1/8 mile times?????

That cam sounds small to me also for that combo. Do you know what the car weighs??? You need to be careful an overcammed heavy car will be a real pig!!!!!

If it is a 10.1 motor i would go with a cam thats 255 @ .050 Intake 260 @.050 exhaust 110/112 lsa you could sneak some more in if the car is on the lighter side.

I would call bullet cams and talk to john and get his recomendation....

Keith
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Old 07-07-2004, 01:33 PM
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You realize the springs have to be changed and you have to use a bronze gear on this.

What type of rpm with the new stick?
HOw heavy is the car?
Have you got a progressive controller on this?

Chris
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Old 07-07-2004, 01:43 PM
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Yes, I do realize that the valvesprings will have to be changed... I plan on keeping it under around 6500-6800 rpm... The pistons are JE custom forgings, and they built them to be 10:1 on a zero decked block, with 64cc heads.. Whatever cam I chose, I will order the full kit with springs, lifters, pushrods, the whole 9 yards.

The nitrous system is a dual stage... Currently I'm launching on 200 shot, and bringin in 100 after shifting to 2nd...

I've never weighed the car, but I'm thinking with me in it (I'm a heavy person) it's around 3700-3800 lbs..

My timeslip looks like this

60'.......1.695
1/8.........6.930
mph........102.78
1/4.......10.773@127.13

I'm working on different springs, and meatier slicks to improve my traction issues this week...

here's a video of one 10.77 run...

http://amarilloracers.com/webvids/10.77.mpg

Thanks for the input guys...!!! Do you really think the carb is choking it that much???? If it is, I can't really tell....
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Old 07-07-2004, 01:53 PM
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carb

Man your 60' times are way!! off a 10.77 car should 60 ' in the 1.48 range

I would fix this first before you change the cam. you will probably get down in the 10.40's range with the 60' times working right.......

I personally don't think the carb is going to hold you back with the set-up you have now. Unless there is something wrong with it....

Get those 60' fixed and hit it with the 300 shot off the line and you will be in the 20's I think that good for the weight of the car and the motor...

Keith
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Old 07-07-2004, 01:55 PM
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I'd reverse your NOS shot, launch on the 100, improve traction, introduce the 200 as the car is moving. Your high elevation also, I know because I have worked with Carrol at Carrols Automotive on projects in the past. You are going to have get something in the 260 range and around 660 to .680 lift. If I remember you are at around 3500 ft elevation. . .thin air going to take more cam.


Chris
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Old 07-07-2004, 02:03 PM
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Yeah, I totally agree with you.... I'm ordering springs, drag shocks, and slicks this week....

The springs on it now are moroso trick springs, but I think they are too weak.. The car sits on the bumpstops. I'm ordering new ones Friday... The tires on the car are 27x10.5 Hoosier quick time pro's, but I'm ordering 28x10.5 MT ET drags.... Hopefully these changes will help lower the 60' quite a bit... Thanks for the input...

I plan on swapping the camshaft, and the transmission over the winter, and was just looking for some insight. The suspension woes are of course taking priority right now....

Yeah, we're at 3672 feet, but the density altitude is always way higher than that... I know of Caroll... Cottle right??? I was actually thinking of having my heads ported by them.. His shop is downtown... That's a big cam you suggested!!! How much (powerwise) do you think this hydraulic flat pos is hurting me??? Thanks.

Last edited by MEAN_SBC; 07-07-2004 at 02:03 PM.
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Old 07-07-2004, 02:07 PM
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Difference of night and day between a solid roller and hyd. flat. Yes, cottal, he did have a BBC camaro he was drag racing back a few years ago. I would highly recommend Carrols work.

Chris
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Old 07-07-2004, 03:08 PM
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Well, I'm gonna run this Hydraulic pos for the rest of this year, and then swap to a solid roller..... Thanks
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Old 07-07-2004, 07:11 PM
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With a camshaft that big, will piston to valve clearance be an issue????
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Old 07-08-2004, 06:47 AM
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Any time you go with a bigger cam, piston to valve clearence should be checked, some have did so and haven`t gotten bit yet, others did it and got bit. If you step up to bigger cam then you have, check it by all means.
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Old 07-08-2004, 07:00 AM
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When building a HP engine, remember 2 words: CHECK EVERTHING!!!!

Chris
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Old 07-08-2004, 09:47 AM
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Yeah, I'll be sure to check it..... That would be a big stupid mistake....
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Old 07-08-2004, 02:04 PM
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Since you're running nitrous, I'd go with the larger 850cfm carb. Adding nitrous will burn fuel more efficiently and allow more fuel to burn in the combustion chamber. With the 750cfm carb, you may be running too lean on the top end.
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