PSI GUY

iTrader: (2)

Building a new engine for the wife's car, she was originally running a 11.5:1 GSR, ported head, sk2stg2 cams, skunk2 manifold 70mm throttle body, etc. Anyway, I am building a B20 bottom to put under it, have all the parts here and ready, just need to assemble. B20 is 84.5mm, 11.5:1 JE slugs and eagle rods, balanced, blah, blah, anyway, want to get some more air in as the skunk2 manifold has a relatively small plenum size for the 2 liter.

Before I go further, I am not an engineer, nor do I have extensive knowledge in calculating air volume, movement, density, etc. I am a automotive technician who has a wife that races and wants more power, ya dig?

Okay, so I have a line on an Edelbrock Victor X manifold, I know people say it's better for turbo than N/A, but have read other postings about it being used on B20/vtecs with good results. Also heard that the Performer X manifold is better suited for all motor but even with them being modded and the runners being shortened it makes good power. So, now that we have that out of the way, if the Performer X runners are too long and people shorter them, why can't the victor X runners be lengthened a bit. Seems like a difficult task but while talking to a friend today we kind of came up with a solution.

If you cut the plenum off the manifold, and added some trumpets, reworked the shape then modded the opening of the plenum to fit over the trumpets, thus giving it the extra length and still having a bigger volume then the Performer or the skunk2, plus having the added bonus of the stack's capability(velocity gains, etc) I think for the cost, it beats buying a custom manifold or having one built. I am only saying this is a cheap alternative as the used manifold is only $100 and the stacks can be bought from Ross Machine for 40 bucks each as seen here...
http://www.rossmachineracing.com/ovalstack.html

Any thoughts on this, am I wasting my time, as it is only time and a few bucks to have at it, or should I modify the plenum on the skunk2 for more volume, but then the runners are not thick enough to even out the entry angles and make everything even. I don't want to get into a huge debate on what manifold is better, just looking for opinions on what people have seen or done if anything like what I plan on doing?

Sorry for the long winded post, just looking for some insight, thanks.

m4xwellmurd3r

Intake manifold design is based off where you want to put the power. Big plenum, short runner intakes put the power band way high, the victor x for instance is made to breathe in the 7000-10000+ range. The performer x is for the like, 4000-8000 range.

There is no such thing as a manifold thats better for turbo or na, except for highly specialized manifolds desogn to mitigate the flow distribution issues turbocharged engines suffer.

I think the reason people put that big victor x on their car is because it makes numbers way high on the charts. What they fail to notice is a manifold like the performer x would give them a much stronger torque curve, at similar hp levels.

Your idea is sound though. Lengthening the runners should make the victor x produce more bottom end torque. Go for it, dyno it before and after.

Uncle Dave

Camshafts,header and exhaust size and the gearing your using along with vehicle weight look at all this first before worrying about the intake manifold mods,you really need to look at where you want your torque curve then you can make a choice on intake manifold designs and mods.

93egSLEEPER

Victor X sucks for NA compared to others. Period.

Ported ITR, Ported S2, Custom Performer X or an AEBS would be my only choices.

Charlie Moua

iTrader: (3)

OP i do follow your though process but i think you are a little head of yourself.

IMHO, modding the IM should be done after you have some baseline numebers for the new engine your building the wify. For now stick with OTS IM. If your b20v is in the +190whp range then IMHO it would make sense/cost effective to toy around with modding IM with VS on runners.

whitesihatch

in for updates, ive waited to see a modded victor x for all motor