any one know where to find good info on this stuff.. im building my own intake and would like a little technical info to optimize hp and tq.. i was planning on basing the intake off of a carborated setup and running an eblow to the tb.. then i wanted to just lengthen the runners on the stock lt1 intake and then increase the plentum volume.. then there was the option to just build new runners and a new plentum.. i would like to know the more technical side of it all though.. any links or pics or books would be awesome.. ive see the ProRam setups.. and the modified lt1 intake posts.. just looking for opinions before i go at it.. i have fabrication skills and dont see any point in spending 1500 bucks if i can do it myself.. so what ever you guys have to offer i would appreciate it..

 

If I told you, I'd have to shoot you.

This is a Catch 22 type of scenerio. Those who have done the research and development aren't going to give away the information freely, and those who haven't and are only guessing probably won't be giving you useful information.

You'll need to decide what info is useful.

Hey, if it were that easy everyone would do it themselves.

Good luck.

 

I can offer no advice in the actual building of the thing, but maybe I can help in getting the info you need department. If you can find a good picture of what you want to build, try to get one that has an object in frame that is of a known size (pack of smokes, number 2 pencil, almost anything...). From that, you can print the pic out and trace a pencil outline of it. From the pencil drawing it's quite easy to find the perspective lines (horizon, vanishing, etc.) and use the known object in the fame as a yardstick for measurement. I've been able to draw out things in 3 dimensions like this accurate to about a 1/8th inch. It wont help you see whats INSIDE, but it'll sure get the job done on the outside A sheetmetal intake would be cake since it's pretty much a bunch of trapezoids.

It's a little hokey, but it works for me.. Good luck with it!

Dave C.

 

F-O,
is there a library near you, with a technical section.?
Look for a book on IC engine design, it will have some basic info.
.
How long, do you want the runners to be?
If short runners are OK, what I would do is,
copy the Weiand Team G , in concept.

By, continuing the intake port shape {use tubing, or whatever}
to the plenum, then flaring the end, like a trumpet.
The only ‘tuning’ you can do is decideing if you want less
cross-section, than the intake opening, of the cylinder head.
also, look at the LS-1 manifold, for inspiration.
.
For what I call ‘tube’ manifolds, you have more options,
but keep in mind that at 5000 rpm, the ‘really tuned’
lenght is something like fifty inches,
so most designs are less than that.
Is the throtle linkage, a difficult issue?
.
Let me know if you want to discuss Mach numbers, and such.

 

Check out my intake harmonics chart, it should give you some thing to think about.
I made it .

 

Good it still works.
http://www.rbracing-rsr.com/runnertorquecalc.html
Those 2 should help you a bit.

 

what about a team g style or victor jr style intake cut a little and the plentum placed on top of the runners..kinda like a cross breed between the lt1 style plentum and the vic jr style runner?

 

well i decided on the final build.. super victor intake is the base.. milling down the runner length a tad except where the studs are usually screwed in then building a "box" to slide slightly over the mounting point where the carb would have been.. then i can just bolt down the plentum right to the carb studs.. then im using a triton v10 throttle body.. will need some tuning for sure.. still curious about the ratio of runner size to plentum size though.. i believe my cam is the [CC-TS-233XR Comp Cams TS233XR Camshaft 233/242 duration @ .050", .569"/.576" lift with 1.6 rockers, 114lsa. Amazing top end pull, extremely lopey idle in stock displacement engine. Nitrous use 200 shot, supercharger 8-16psi. ] anyone help me out with the ratio here?

 

Plenum volume: more than a six pack, but less than a 12 pack, IMO.
(12 ouncers, that is).

 

lol..

 

Actually it was a serious answer. Just do the math.

Measuring the volume of something like a manifold runner, or all of them, is fairly easy with liquid and an accurate measuring cup or scale. It's not like measuring a combustion chamber where tenths of a cc count. Besides, you can have fun disposing of the liquid if you want.

1 gallon is pretty close to 231 cubic inches.
1 gallon of water weighs about 8.34 lbs.

 

lol...GN motor = 1 gallon! i never thought about that....but, now that i do...1 gallon does equal 3.78 liters. damn near 3.8L...ok, im done!

 

well i was told the optimal plenum size was equvilant to that of the motor!!! so that means 355 ci of plenum!! i could be wrong but that seems liek a alot of damn air.lol.. and still i under stand how to measure everything.. i just need to know how big the plenum needs to be in reference to the size of the runners or vice-versa... ie- "plentum should be 2x volume of runners or 1/2 volume of runners.. blah blah.." i would just hate to put all this time in fabing it with out any research.. i have looked all over the net and come up with only the "plenum should be same as the ci" well thats dandy but what about the runners? i have my compression ratio, cam, ci, gears, basically the whole combo posted. is there not a calculator that can hook me up..lol..

 

Let's see, 1-1/2 gallons would be 346.5 cubes. Hmmm... There seems to be another nice GM engine about that size.

 

Corky Bell's maximum boost and David Vizard's How to build & modify chevrolet small-block V-8 cylinder heads both say somne thing like that.
Maximum boost says that "generaly 50%-70% of engine displacement" I think "How to build & modify chevrolet small-block V-8 cylinder heads" says some thing like up to the displacement of the engine in the plenum vol or more. The index isn't that good so I can't find like I did in max boost.
Big plenums help make power.