as the title says...
what can i do to my stock runners to get better flow?
can siamesing only be done with aftermarket runners or what??
Mikey

 

TTT

 

They can't be ported, the walls are way to thin, but you could cut the runners and then weld two of the runners together and make them turn out like the SLP's. I think that would be more work then it's worth.

 

it would give me something to do :P lol..how would i go about welding them?? use sheet metal to put em back together?

 

I would try my luck with aluminum and get so Argon. You could try sheet metal but the casting of the stock runners is SUPER THIN, and welding to it might not be a great idea in the first place.

 

Supposedly you can use the material in the housing off of an onboard computer as the metal. I have seen pictures of this (from this site) and it looks doable. Has anyone tested this runner to see how it compares to aftertmarket runners? I have SLP's on my car and have considered this method myself.

 

Stock runners can be sent off & have Extrude Hone hone the insides, which also results in a very smooth interior wall.

Siamesed stock runners has already been covered.


But don't forget the bottom intake base & the upper plenum. They can also be ported. Extrude Hone can do the lower & a Dremel tool can be used for the upper plenum.

 

sweet cant wait to do this...gahh..haha
gonna do a search for siamesed stock runners now..

 

I dont know if it works but Ive heard about filling the runners up with water and then putting them in the freezer. When the water freezes its supposed to stretch out the runners as it expands.

 

But for it to work, both end has to be capped, with only a small hole left for the water to expand out. Too small & it could rupture the runner. Too big & it will just expand out & not push against the dents.

 

couldent find any threads about successfully siameseing these,,,,

 

Stock runners have no material for expanding they are so thin a propane torch can burn though them easily so welding would be out of the question.

 

even TIG welding? >.<

 

SLP Runners are $329.95 right now. Just bite the bullet and buy them.

 

nah..too easy..ima buy a set of crap runners and try it..
Mikey

 

400hp/500lb fts is pretty easy on stock top end parts. After that, the dollars start going out faster than the hp/ft lb numbers come in.....And it retains a stealth profile. "Yep, its a mostly stock TPI. Wanna run?"

And those #s make for a GREAT street car and light to light challenges.

 

yeah lol..next mod is heads and cam so i should be alright

 

There is a thread about doing this on a corvette forum. They show the process and tell what they used.

Go:
http://forums.corvetteforum.com/c4-t...unner-mod.html

Tell us how it turns out, im all for diy cheap hp.

 

thats EXACTLY what i wanna do! mos def doing it...

 

For a sweet finish to them, have them powder coated or polished.

 

I think this is a good idea for someone who doesnt have the cash, but in all honesty, its a crap shoot as far as quality and time spent for the performance. Dont get me wrong, I think its cool to do your own runners, but if someone is going to make some runners, someone needs to make some short, fat runners somehow, turning the TPI into "RPI" Ram Port Injection.... kinda like the 1st fuel piece, if not JUST like it, for cheap.
Any takers??

 

here is what i have done. i sold these a few years ago

 

How does the power/ and power band compare to aftermarket runners?

 

i never had these on the car sold them because i went a different direction with fuel injection.

 

see i like the way that looks and even if the improvement is small i wanna do it...

 

i have an intake that i started to mod for sale if interested.

 

I am thinking that this type of runner may perform very well. UNfortunately I have never found comparisons to the common aftermarket runners such as SLP/Edelbrock. Since they are fully seimesed they should move the power band up.

 

thats the goal...tryin to do this so i dont have to pay $300+ for aftermarket ones..

 

Extrude Hone will do the stock runners for $270. Saves you $30+ !

 

Invest in one of these, and you will not have to worry about the crappy flow of the stock runners for a good while.



It'd defeat the purpose of not wanting to spend $300+ since most Turbonetics GTK's are over $2,000 each, but hey, what can you do.

 

lol...well this "project" with my runners wont cost me a dime as im gonna be doing it in my shop class once school starts

 

If you want a project, put a slit down each runner tube on the outside, down just one half. put a slice down half of the top, and port it open to 1.6" ID leaving the bottom alone, then run a steel ball down the tube. Tack weld some sheel aluminum back over the tube while the ***** are inserted, remove the ***** and close up the welds. Should work well for a 350. Go with a 1.65" ball for a 383.

Note that runner length will slightly increase if you do this to the outside of the runner (if they were installed on the engine) and decrease the length slightly if done on the inside.

Done right, it works, and someone good with aluminum can hide the fact that they were modified. This is how I size runner tubes to different engine combos since different engines and combos require a little different intake prep. Weld it, grind it down, sandblast it and paint it in aluminum cast coat and clear it. They will look new and unmodified, just larger. The hard part if working out those bumps in the tubes to clear the bolts... that part was a PITA! I just weld up around the stubout on the bottom of the runners and port the inside to remove those before running a cross buff on a flex shaft through the runner and base (bolted together).

Damn I need to open up a TPI shop lol

 

lol..any pics of such said runners?

 

No, but maybe I should do a writeup when I get back. I'm in Iraq right now and the pics are on my external at home.

I'm planning on doing a set in 1.66" for my trans am thats about to get a 383 and another set for my 427ci TPI project engine. The larger set will be done in 1.75 and requires splitting both sides making it alot more complicated.Runners can't be opened up like this much more than 1.65" without risking a compromise in gasket material and sealing ability along the top half of the runners where they meet the plenum.

 

ahh i see..well lemme know when you get that done thanks
Mikey

getting back in the shop 2marro so we'll see how this goes..

 

If your going to be working on this in your shop class why dont you spend the money on some SLP runners and do what Kevin and Don did to theirs. It would be really cool to say you did it and it would look BA.

 

i dropped the class so i wont be doing this anymore the class got a different teacher that didnt know a socket from a wrench...he asked me what i ment by "my car has a 350" O.o lol..so i dropped it....
Mikey

 

Take it up with Administration & get him replaced......

 

ehh...i switched out already..ive taken that class 4 times already so im good..im taking Virtual Enterprise now so i can get some business experiance
Mikey

 

WTF

 

i know you want the post count but MODS PLEASE CLOSE. thanks..

 

um no, im an little to mature to do that on hear, its that you were all into doing this and then all of sudden you decide to quit the class (not that im saying you shouldnt of) it's just kinda funny how things change so fast...

 

whats funny about it? the teacher changed therefore i didnt want to have to do all the book work again, establish a good enough relationship again with the shop teacher so he would let me bring my car, and i didnt want to put up with having this guy ask me what something is when he should know because hes the teacher. also, i switched classes because the class im taking now is a course about entrepreneurship so after this class ill have at least SOME experiance with business and this played out in my favor anyway. BUT at any rate, id love to still do this, i just dont have the resources for a welder, grinder or dikes.
Mikey