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Old 10-12-2012, 07:53 PM
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Nitrous cams ?

Talking small blocks here...

What is the main difference that seperates them from others... n/a cams vs nitrous cams. Valve events, lsa, ivc/evc, lift etc...

Are there any off the shelf cams that can be used ase nitrous cams by altering timing events (advance/retard)
Is there a possibility to use single pattern camshaft in a spray application ?

At what point (big shot) it should become necessary to use a nitrous camshaft instead of lets say Comp Cams Xtreme Energy camshaft or similar ground on 110 LSA ?

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Last edited by monzter; 10-12-2012 at 07:58 PM.
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Old 10-12-2012, 08:57 PM
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If you use anymore that 150 horse NO2,you need more than a nitrous cam...pistons,new rings,special gap,excellent ignition system..
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Old 10-13-2012, 05:59 AM
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And if all those things are given, forged pistons, correct ring gap, good rod bolts and a bullet proof ignition system. What kind of cams are we looking at, and can off the shelf cam be used if it's advanced some ?
Talking about 150-250 hp single shot on 350 sbc here.
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Old 10-13-2012, 09:00 AM
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Many of the Crane Powermax Hyd , solid and roller cams are dual pattern and ground on wider 112-114LSA.
They make great "Nitrous-cams" You can install as per cam card or advance a bit more.
Nitrous likes less overlap (wider LSA) and a early exhaust opening point. (exhaust blow down point)
to deal with the increased exhaust gas volume.
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Old 10-13-2012, 09:24 AM
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Sorry to chime in but would this particular camshaft be ok on the spray if advanced ?
http://www.compcams.com/Company/CC/c...?csid=304&sb=2
And do i understand that if the camshaft is advanced 4 degrees. Does that alter all valve events by 4 degrees ? There for open the exhaust valve sooner ?

Last edited by Icejeep; 10-13-2012 at 09:33 AM.
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Old 10-13-2012, 09:40 AM
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I have before used Crane Powermax 272/284 hydraulic camshaft with good result, but that was not with nitrous, only n/a. They all seem to have much split duration at 0.050" lift and adv. duration, they also seem to have more lift at exhaust valve for better scavenging right ? Then i assume nitrous likes big tube headers also.
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Old 10-13-2012, 10:01 AM
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Quote:
Originally Posted by Icejeep View Post
Sorry to chime in but would this particular camshaft be ok on the spray if advanced ?
12-769-8 - Xtreme Energy
And do i understand that if the camshaft is advanced 4 degrees. Does that alter all valve events by 4 degrees ? There for open the exhaust valve sooner ?
Yes this cam is fine for nitrous. Its a bit mild thou for serious power.
Can be installed as per cam card or advanced a bit more, say another 2-3deg.
Always degree the cam first before adjusting the phasing.
Yes moving the cam effects all 4 valve events.
If using this one I would run the valve lash tighter than spec.
.010" to .012" intake .012" .014" exhaust, set valve lash cold

Its a bit small for a hard shot but you got the idea.
Nitrous versions of these cams with a different (wider) LSA and or a different exhaust cam lobe are only a phone call
away.

Last edited by F-BIRD'88; 10-13-2012 at 10:09 AM.
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Old 10-13-2012, 10:06 AM
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Quote:
Originally Posted by monzter View Post
I have before used Crane Powermax 272/284 hydraulic camshaft with good result, but that was not with nitrous, only n/a. They all seem to have much split duration at 0.050" lift and adv. duration, they also seem to have more lift at exhaust valve for better scavenging right ? Then i assume nitrous likes big tube headers also.
Yes this is a good cam for mild nitrous. It has the extra exhaust duration .

I like the next Crane cam for mild-moderate nitrous/blower where a hyd is desired.
Crane HMV278-2. (powermax H278-2)
278-290 222-234 114LSA. Can experiment with the cam installed on a 104 to 109 intake C/L for best effect on nitrous.
Always degree it first before moving it.
Its a good one for mild street-strip nitrous.
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Old 10-13-2012, 10:09 AM
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Thank you sir.
How big of a shot you think it would tolerate ?
How much tighter should i run the valve lash ?

I have this thread here - Pistons and rods for sbc 350 ?
Hope you can give your self a time and read through it and tell me your oppinion as i don't want to steal this thread here. First it was about finding the right piston and rods for my strip car, but since i have that figured out i am looking for camshaft recommendation.
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Old 10-15-2012, 12:59 AM
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is it better to go hyd with nos or solid? or really does it matter with lifter type?
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Old 10-15-2012, 10:25 AM
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Whenyou inject NOS ( especialy a big shot) the your MPH is going to increase a lot.
And the resulting engine rpm at the top end. The mechanical lifter camshaft will tolerate a lot more rpm before bad things happen .Like lifters pumping up from valve foat at high rpm.
having both valve held off seat while injecting nos and throw in ignition and you got trouble.
can you say BANG!!!.
Solid lifter cams ( flat tappet or roller rev higher and tolerate momentay valve searged thu the rpm range al lot beetter. Hyd cams do not recover from serge like a solid will. ( the lifters pump up)

When runing NOS you can expect higher engine rpms. Can be very critical depending on how your car is geared. The solid lifter cams work better. More stabe at high rpm more power at high rpm.
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