Well, I am looking for the cam specs for the P12 20V cams.

Thanks Andreas Miko

i have some specs for those cams. msg me on how you want them. they are pretty similar to the n1. i tried calling you the otherday but you got a new cell number i guess

If the 20v cams are similar to the N1 cams, then why would the 20v sr20ve only make 204ps? I would expect at least 215-225ps if not more since the N1 makes 200ps. Am I missing something?

maybe its because of the n1's higher comp and honing of the intake , and more tuned ecu etc. maybe?

Throttle body is also bigger on the N1 also (not 100% sure on this but pretty sure). So that would be cams(slightly different), Intake manifold, TB (maybe), Compression Ratio, ECU, Higher Revs (same cams in a smaller engine are bigger in % and allow higher revs). Possibly some port work. My guess its all in the small details since the N1 is a super low volume motor.

The N1 has 11.9 to 1 compression. 20V has 11 to 1 compression. The N1 has ported intake and head, 20V does not. The N1 has a 1 in shorter intake manifold, 1 inc larger plenum and larger TB 70mm vs 20V 60mm TB. The N1 has a better rod to crank ratio which make it more efficent. N1 rod about 2.0 ratio and 20V 1.551 ratio. I think my figure are corrrect. all these factors play a big diffrence into the HP equation.

Andreas Miko

As far as the 20V 204 hp cams go the small lobes have a larger cam lift and duration so it will make more power than the SR16VE and N1 cams in the mid range section. The 20V low side lobes are even bigger than the standard 20VE 190 hp motor. On the high side the 20V has a little more lift than the N1 but less duration on the intake side and on the Ex the 20V has a little less lift and duration than the N1 cams but the 20V 204 hp model has more lift and duration than the standard 190 hp 20VE.

What I am looking for is the actual numbers.

As for 98sr20ve and Shoe59 I might try and get a head exchange going with a moded VE head so that the 20V cams will fit. We will see.

Andreas Miko

Thanks for clearing that up, but I just a few more questions that I hope someone can answer...

1. What would be the optimum specs for a custom grind cam on a SR20VE, ~2.3L (with 89mm or 90mm bore), or 2188cc (just bored 90mm, not stroked). Both on the low and high cams.

2. What needs to be done to allow the any of those combination to rev to the desire rpm to take advantage of the cams. Im hoping the 16ve valve springs can do the job.

Is the N1 intake manifold the same bolt pattern as the regular DE manifold? Ports match up?

http://www.gonzonx.com/modifications/images/throttlebodies.jpg

VE throttle body on left, N1 throttle body on right

Chuck, where did you get a picture of those Throttle Bodies. Do you have a way of getting that Throttle Body. Anybody know the size of the RC Enginering TB that we can get for our cars. I thought it was a 67mm or so.

to me it looks as if the holes wont line up. Might need to fabricate an adaptor plate or use the N1 Plenum to use the N1 TB. I wonder how much a N1 Plenum + TB would cost and how much hp it would make?

if you wanted one, money shouldn't be the first thing in your way. think about the rarity of those parts.....

i wonder if we could source some of those N1 parts from Nissan even if we had part No's b/c of the super limited production?

oh man! thats large...looks like a coffee mug! :eek: ahhihi...what do you get with a larger TB? :)

But is larger better? Smaller diameters flow faster. In Honda-land, b16 TB on R intake manifolds on B16 make more HP. Yes, I know a B16 is not an SR motor, I'm just using it as an example.

Originally posted by scmser
But is larger better? Smaller diameters flow faster.

Sounds like someone has been reading Motoman (http://www.mototuneusa.com/).

Steve

Steve,

I don't know if/how it works on car/our engines but I can assure you that it WORKS bigtime on motorcycle engines.

Chris

Originally posted by 98sr20ve
Chuck, where did you get a picture of those Throttle Bodies.

Bubba's site.

But why is the plenum BIGGER on the N1?Intake plenums are usually 60% of displacement volume. 1.6 bigger than 2.0 plenum? Will some mechanical engineer enlighten me? I know the runners are shorter, does the larger TB and plenum compliment that?