Intake manifold design Q's for this throttle setup?

tony2ltr · Post by **tony2ltr** » Wed Dec 07, 2005 2:08 pm

Guys, Any suggestions in manifold design for turbocharging this setup?
My velocity stacks are a bit shorter and they are carbon fiber instead.
For what they look like inside the car, look at "ms getting weak under spark control" by tony2ltr.

Thanks,
Tony

Post by **efahl** » Wed Dec 07, 2005 5:50 pm

Tony,

Just pop a plenum over the whole mess, maybe made from a 4-5" aluminum tube. I think that thing looks a lot like what Justin Olson is building up for his engine, the biggest difference is that he has one more cylinder.

Eric

tony2ltr · Post by **tony2ltr** » Thu Dec 08, 2005 5:00 am

Is there any problem with using a box VS a tube? A box would be much easier to make and install. I just wonder where the law of diminishing returns comes in.

Tony

mickeymarrows · Post by **mickeymarrows** » Thu Dec 08, 2005 5:40 am

I believe there are some laws of physics that means that a cylinder works best, I know all the '80s F1 turbo cars had cylindrical plenums, I once mate the mistake of asking a Renault F1 engineer why, he explained it to me, I haven't a clue what he was on about

tony2ltr · Post by **tony2ltr** » Thu Dec 08, 2005 9:53 am

OK, fair enough, Like I said, I wonder if it is a matter of 1horsepower or 20hp difference.
???
I would make some joke about Renault cars, but my project is a Chevy Vega (even though it is Cosworth designed) -- the CV was one of John Delorean's pet projects (RIP).

olsonjus · Post by **olsonjus** » Thu Dec 08, 2005 10:14 am

You can check out ross machine racing:

http://www.rossmachineracing.com

They make nice plenum stock that is very strong. How thick are the velocity stacks you are using? I was going to use velocity stacks made for weber carbs, but they are too thin...

I have two sets of velocity stacks for my custom intake manifold I'm making. Here are some pictures comparing the two designs. I really like the weber stacks because they have a very nice taper to them, which has shown to perform very well. What I dont like about them is there 0.035" wall thickness. This is where the ross stack design shines. It is very thick walled, and durable. Do you guys think it is possible to build a durable and reliable intake manifold using the thinner stacks?

48 IDF 5":
http://www.tperformance.com/st...tacks/

2.0" stacks:
http://www.rossmachineracing.c....html

Regards,
Justin

olsonjus · Post by **olsonjus** » Thu Dec 08, 2005 10:16 am

I'm ending up going with the ross stacks, and this design for the plenum:

I may have to cut a hole in the hood for clearance but I'm alright with that. I may add cooling fins to the part of the plenum that stciks through the hood so it is always at ambient temp

Should look like the mad max audi MObile when I'm finished

tony2ltr · Post by **tony2ltr** » Thu Dec 08, 2005 10:26 am

I think you are going to end up with problems around 1 and 5 cyl's
I would give 1 and 5 a little more space around the stacks.
As far as thickness goes, Mine are paper thin carbon fiber. I think if this is good enough to run nat asp on 10,000 racing engines, they will be fine inside a plenum that will be relatively heavy and will absorb engine vibration.

nice stacks, by the way. But,,,, are you sure you aren't making Martinis?

I guess you want your air shaken, not stirred!
Tony

510rob · Post by **510rob** » Fri Dec 09, 2005 4:12 pm

olsonjus wrote:Should look like the mad max audi MObile when I'm finished

...Phase-4 heads... ...ssss..ssss...ssssucks NITRO!!!

it's the duck's guts, Maxy!!!

(sorry, Mad Max is an all-time favorite movie of mine, and you just put me in the mood to watch it again!!!)

tony2ltr · Post by **tony2ltr** » Fri Dec 09, 2005 7:22 pm

There was an article in Hot Rod mag in the 80's that was about those heads. They were sitting in phase 4's showroom. Are they somewhere in the Southwest? Arizona?
I want an electric clutched supercharger!!!
Actually , I was thinking about slotting my hood as well for the tube surrounding my stacks. It is atrange how great minds think alike!

Tony