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kentactic 11-30-2012 06:34 PM

Cam selection
 
Ok so if you were following my last thread i was building a 350 for nitrous. Ive since abandoned that and am building a 383 all motor.

Im planning on these heads:
Assault Racing Complete SBC Small Block Chevy Aluminum Cylinder Heads Angle Plug 350 383 400 - KMJ Performance
I already ordered this Rotating Assembly at .040:
Assault Pro Series 383 Balanced Rotating Assembly - KMJ Performance

Now that setup should give me around 10.5:1 according to the chart on the Rotating assembly page. With that said i THINK im looking for a cam in the 233 Degree @ .050'' on the intake side. Does that sound right? If i run something better then pump gas is it beneficial to increase this? This is a track only car so no worries on gas mileage etc. Just looking for power.

Heres the cam i was looking at:
SBC 234/.533 242/.548 112+4 OE Hydraulic Roller Camshafts - KMJ Performance

Any help is much appreciated.

-Kenny

vinniekq2 11-30-2012 06:56 PM

nice mild cam. no idea what its purpose is? If its a street car, thats daily driven with weekend fun in mind,then sounds ok,have fun

kentactic 11-30-2012 07:02 PM

Quote:

Originally Posted by vinniekq2 (Post 1617628)
nice mild cam. no idea what its purpose is? If its a street car, thats daily driven with weekend fun in mind,then sounds ok,have fun

Thats what i feared the info i found was leading me to do. I want the most power possible. Surely there is a cam TOO big for my setup. so what cam might be better suited for making power? STRICTLY for making usuable power in a straight line. If the carb decides what cam i use then what ever the best carb is to throw the best cam in is fine since i have no carb purchased yet. Bassically what cam on the best carb with 110 fuel should i run?

Also if this changes anything im considering building this car specific for 1/8 mile drag as it is a more accessable track around here. there are a few. Also they host sand drags 4 miles from my house a few times a year. If the cars built for 1/8 mile then the 300ft sand drags will be a little better aswell.

vinniekq2 11-30-2012 07:39 PM

If you are drag racing:
find a track/car

determine how quick you want to go,with the car you have determine how much power you need IE, a 3300 pound nova will run into the 12s with a 425 hp engine and 4.11 gears/3 speed auto and a fat guy driving.
every hundred pounds will save/cost a tenth or more. If its really a race car then use racing gear ratios.

The heads will tell you how much power you could make,the cam will tell you what RPM that it happens and or if you will meet t he potential of the heads. the CR needs to be factored in. The cubic inches will also determine when the power occurs

and all the stuff you learned last thread

kentactic 11-30-2012 07:50 PM

Quote:

The heads will tell you how much power you could make,the cam will tell you what RPM that it happens and or if you will meet t he potential of the heads. the CR needs to be factored in. The cubic inches will also determine when the power occurs.
Ive given all of the above. So what cam fits in the designated slot? lets assume i want to run 5's in the 1/2 mile. Now that theres no such thing as a goal time to avoid surpassing accidently by making too much power... How quick do i want to go? As fast as my motor will push me.

With the data i provided what cam makes the best power? Its a simple goal. "The most power possible" I cant make it any simpler then this.

Heads: 200cc Intake port, 2.02/1.60 valves
Cubic inches: 383
CR: 10.5:1
Camshaft: ?

This question is open to anyone who would like to provide an opinion for the answer.

hcompton 11-30-2012 08:01 PM

Comp 294s is usally a good place to start. But needs compression and gears and good stall.

kentactic 11-30-2012 08:04 PM

Quote:

Originally Posted by hcompton (Post 1617647)
Comp 294s is usally a good place to start. But needs compression and gears and good stall.

Just to clearify are you saying 10.5:1 wont cut it or it will?

vinniekq2 11-30-2012 08:23 PM

you wont be doing 5s in any car in the 1/2 mile,

the parts you ordered so far should put a 3300 pound car into the 12s

kentactic 11-30-2012 08:28 PM

Quote:

Originally Posted by vinniekq2 (Post 1617666)

the parts you ordered so far should put a 3300 pound car into the 12s


Im going to TRY and build a lighter car then that. But if i run 12's then ill be perfectly happy with that.

Now what camshaft are you imagining in this 12 second 3300lb car?

vinniekq2 11-30-2012 08:35 PM

I use big cams in my cars,
for you maybe something like this

110173-10S NA 273 279 241 247 .570 .570 110 106 .022 .022 1,2,5
2800-7000 Small Base Circle, Fair idle, High performance Street/Mild Bracket. 10.0:1 CR, 2800+.

kentactic 11-30-2012 08:45 PM

Quote:

Originally Posted by vinniekq2 (Post 1617674)
I use big cams in my cars,
for you maybe something like this

110173-10S NA 273 279 241 247 .570 .570 110 106 .022 .022 1,2,5
2800-7000 Small Base Circle, Fair idle, High performance Street/Mild Bracket. 10.0:1 CR, 2800+.


Ok now the heads im running says its for flat tappet. Wont work no?

This cam is flat tappet and although this cam dosent have a recommended compression the one next size up says 11:1 or more so perhaps this one being one level less will work on 10.5:1 ? Im liking the RPM range.

Sbc Solid Tappet Chevy 350 383 Camshaft Kit 290/300 Gm - KMJ Performance

EDIT: Now im not seeing that they are for a flat tappet lifter so the heads work either way?

vinniekq2 11-30-2012 08:55 PM

112312-10 NA 287 291 252 256 .530 .536 110 106 .022 .022 1
2800-6800 Hot Street/Strip, 383+ cubic inch, 10.0:1, 2800+ stall.

a little solid flat tappet

hcompton 11-30-2012 09:08 PM

Quote:

Originally Posted by kentactic (Post 1617649)
Just to clearify are you saying 10.5:1 wont cut it or it will?

Yeah you should be fine here is the link to the specs. This more of an old school race cam. That can be used on the street enough to get to the track.

12-224-4 - Magnum

Not saying the other cam suggested is bad. Just always had good luck with this one and alot of ppl run them so not to hard to get it dailed in. This is a flat solid cam. And should work with most after market head setups.

kentactic 11-30-2012 09:22 PM

Quote:

Originally Posted by hcompton (Post 1617685)
Yeah you should be fine here is the link to the specs. This more of an old school race cam. That can be used on the street enough to get to the track.

12-224-4 - Magnum

Not saying the other cam suggested is bad. Just always had good luck with this one and alot of ppl run them so not to hard to get it dailed in. This is a flat solid cam. And should work with most after market head setups.


Ok thanks for the input. Ill add this car wont be driven to the track. always trailered.

vinniekq2 11-30-2012 09:31 PM

then use race parts


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