is this cam suitable for nitrous?

Message

rustbucket · #1 Post by **rustbucket** » Thu Jan 25, 2007 9:27 am

lunati
.626 intake 262 @ .50
.626 ext 271@ .50
lobe sep. of 106
solid roller 4/7 swap
thanks, tony

CoMax Racing · #2 Post by **CoMax Racing** » Thu Jan 25, 2007 12:22 pm

I would say no due to the fact that it is ground on a 106 Deg lobe center angle. Nitrous cams need to be in the 114 deg range to reduce the overlap and take advantage of the higher cylinder pressures.

Hope this helps

#3 Post by **John_Heard** » Thu Jan 25, 2007 1:17 pm

How much spray?

TubbedTruck67 · #4 Post by **TubbedTruck67** » Thu Jan 25, 2007 2:55 pm

Thats the same cam I run, but mines a standard firing order. I havent sprayed it so Im not much help though. It goes 12.30's in the quarter in a 4000lb truck.

rustbucket · #5 Post by **rustbucket** » Thu Jan 25, 2007 3:47 pm

last season i sprayed 275. not sure how much this year. on motor im running 6.84, I need to shave off 8/10ths to run the 6.0 class.

Im starting off this year with 175 and going up from there.

rustbucket · #6 Post by **rustbucket** » Thu Jan 25, 2007 4:46 pm

spoke with lunati, i told him my grind and he said unless i tell him exactly how much nitrous i want to spray, he cant help me. i said however much it takes to shave off 8/10ths. he reinterated if i cant tell him exactly how much nitrous, he cant even suggest a part number. I have time for a cam change if needed. can you guys help me out.

Heres the combo now.
72 nova
406 cid
patriot race heads
225 intake runners 100% cnc ported
2.08\1.60 valves
the cam listed above
dome pistons 12.8:1 comp.
4000 tci nitrous converter
powerglide w/brake
4.56 gear
the block is block filled, studded with forged internals.

the cars has run 6.84@102 in the eighth with a t350 tranny. Need to run 6.00 with powerglide.

#7 Post by **John_Heard** » Thu Jan 25, 2007 5:12 pm

I'm hoping Smokey might chime in on this one. I would think that maybe you might want to increase the lobe centers some (110/112?) and maybe a bit more duration. But I'm not up to date on SBC stuff really.

mytmouz · #8 Post by **mytmouz** » Thu Jan 25, 2007 7:51 pm

Had a similar combo once, it went in the 6.o's with a 225 shot and a slightly tighter converter. It was a 326, .660 with a 112 center. It was an Isky grind, VERY consistent.

sunsation540 · #9 Post by **sunsation540** » Thu Jan 25, 2007 8:42 pm

it is 400 inches any amount of spray will make torque i looked up your heads they increase flow to 700 lift, less duration more lift and wider centerline, the other guy is right it's cylinder entrapment, short lobe centers and high duration drop both static and dynamic compression.. lunati# 501c5lun 10degrees shorter at 0 same 50# and 0.645 lift rember after rocker lash it's 0.625 real lift i would use 1.6 all the way around grind on 112 lobe center with intake on108 in the book they list this cam from 4000.-8500.get er done,,,

stracer859 · #10 Post by **stracer859** » Thu Jan 25, 2007 9:20 pm

bullet cams sold me a cam with the same lobe sep (106) and i told him i was gonna spray around 250, said it didnt concern him unless i was goin with 350 + all the time. told me it would work fine and my old cam in the old motor had a 106 and i had 150 on it all the time never hurt nothing. now u might gain some hp on the spray with a 112+ lobe sep,

rustbucket · #11 Post by **rustbucket** » Fri Jan 26, 2007 2:34 pm

hey sunsation, i appreciate the research and effort that you invested in helping me. I spoke with lunati again this morning and due to my motor needing a .900 base circle cam he suggested the following.
it would be a custom grind.
adv. dur. 297/309
dur.@ .50 264/276
lift .648/.627
111 lobe sep.
107 intake centerline
4/7 swap
.900 base cir.
4000-8000 rpm

sunsation, being that you looked at my heads, do you think this would be the optimum cam or do you see room for improvement?
thanks again, tony

sunsation540 · #12 Post by **sunsation540** » Fri Jan 26, 2007 9:25 pm

did you get a diffrent cam rep ??? the higher intake lift and same 50 numbers with the intake advertised 5* less is a good thing... this cam is a far cry from that average mongroul that was first listed...if you have bigger than 1 7/8 headers i would still use 1.6 on exh if that is an option the increased window with nitrous would be much better , this is not to rowdy of a stick it's only 1.8 degrees lift for every degree of duration they are spring killers at 2. to 1 both lobes are from the same family.. much better choice...

aitch o · #13 Post by **aitch o** » Sat Jan 27, 2007 11:10 am

your first cam you listed is a pretty responsive motor cam (tight 106), but will not pick up the full potential of your motor on the spray (maybe 4-5 tenths in the 1/8th and 6 to 8 in the 1/4).
the second cam you list is much better for the spray with the wider 111. still not extreme by any measure. it will flow the exhaust out much better because it is later in the cycle. it will respond well between a 150 and 300 shot. i predict 6-8 tenths in the 1/8th and 1 to 1.5 seconds in the 1/4.

i ran my sbc 400 on spray for 6-7 years and fairly well understood what cams it liked and didn't. eventually ended up with a 285/304 @ .050 ground on a 114 and lift around .700. it went 10.75 on the motor and 2 full seconds quicker on a 350 shot.

is this cam suitable for nitrous?

is this cam suitable for nitrous?

Suitable Cam

sbc nitrous cam

Who is online