[John Langer]

Originally Posted by johnta1

Longer?
Or later? (exhaust closure)

Area under the curve, longer. This is the race section, right?

[John Langer]

Again, someone please show me an example of an nos cam. You know one of those max effort sticks that push people well into the 7's...

[dda72]

So my 268/278 duration cam on 108 centerline isn't good? Damn it.........

[John Langer]

Is that a solid lifter or conventional hydraulic cam...

[dda72]

Tight lash solid, is that good choice??

[cgeise]

The gap that used be between N/A and NOS and even Tubo cams has gotten a lot closer over the last few year - at least thats what I have been shown, and by the why, there is a NOS specific Carb - Call Dale Cubic and he can explain it to you as I dont remeber the details. Carry on

[johnta1]

Area under the curve, longer. This is the race section, right?

Sure is, where are you at?

Exhaust valve open longer sounds like duration to me?
(from EVO to EVC)

Nothing to do with LSA?

[RAIV-Z]

Originally Posted by Hooter

I've always said we need one of those blow up boxing rings with the inflated gloves for Norwalk. Everyone can take their aggressions out on each other. Too bad most of us old farts on here are at or nearing heart attack age and we'd end up in the ER.

Beer Pong would more appropriate, both young and old can participate.

[dda72]

Langer, So is 4 degrees advanced is too much? Maybe straight up? Shift it 6800rpm?

[EPC_Motorsports]

Originally Posted by John Langer

Is that a solid lifter or conventional hydraulic cam...

I prefer a 3/4 cam my self. I like the rv selection for nos.

[dda72]

Originally Posted by EPC_Motorsports

I prefer a 3/4 cam my self. I like the rv selection for nos.

No 3/4 cam is solid lift...........wake up there's better technology now!

[mysticmissle]

Rhoads lifters ttfmfr

[David Holmberg]

For nitrous I just use a higher ratio exhaust rocker arm and a RAIV cam.

[dda72]

Originally Posted by Ray Cox

Jack I asked if you still had it never said I wanted to buy it.. Had another post going trying to use one for the first 2 races.. Another py member came through. Got it today.. But I did end up buying it instead of using it..Arron don't forget this project is only partially financed so far. Long way to go. I don't have LIL Jack cash.

To get this thread back on topic, Ray glad to hear your making upgrades and changing things up. Wish you the best in 2014! Enjoyed visiting with you and your son last year during NMCA races!

[RAIV-Z]

Originally Posted by David Holmberg

For nitrous I just use a higher ratio exhaust rocker arm and a RAIV cam.

I have a spare set of 1.65 Crane Energizer rockers...

[Ray Cox]

John while talking to tony about the heads he is going to do for me he said it will make "a little less HP" being set up for nitrous because the cam and the chambers are both different. I have no idea what the cam is only repeating what Tony said. So there must be some differance on a nitrous cam.

[Aaron Quinton]

It will depend on the exh valve size but yes, it will want more duration. The optimum exh closing will be a little earlier assuming the exh system is the same and the exh opening will be sooner. I don't know the details of your heads but a 10-20 deg increase in seat to seat exh duration over an optimized NA event would be reasonable.

Assuming your int valve is 2.40" and exh is 1.75" or so, I'm surprised you're not run a larger difference in seat to seat timing now.

You can label the cam whatever you want. A 50% increase in mass flow using the same exh port and valve will want more duration (earlier EVO) for optimum performance.

I'm out ...

Originally Posted by John Langer

I already run over 30 degree difference on duration from intake to exhaust so would a nitrous cam have 40-50????

[John Langer]

286/318 on a 117. Ray, you have to soften up the chambers and reduce compression on the naz compared to n/a. There is a ton you can do with cam profiles.

[John Langer]

2.320/1.700

[Ray Cox]

Originally Posted by John Langer

286/318 on a 117. Ray, you have to soften up the chambers and reduce compression on the naz compared to n/a. There is a ton you can do with cam profiles.

I am sure there is a lot that can be done,I plan on doing whatever Tony recommends. First 2 races will be with the old motor. But I do have a few new parts for it that should make it more interesting.