Stock intakes question

[Skunksmash]

This is probably a dumb question, but what is the value of boring out a stock intake? From an engineering standpoint, I mean. And can it even be done? For example, say for originality purposes, I want to keep my stock intake. But, as we all know, they flow like poop compared to all those aluminum ones from companies like Edelbrock or Trick flow. And, many of us want more power.

So, could a stock intake be "bored" out, through all the passages? I'm not talking about just simple port matching, though of course that would be part of the process. I'm talking about gutting out even more metal, all the way through the WHOLE intake. When you port match, all you do is match the port sizes. You don't do anything else to the rest of the runner for that hole. Is there some way to make the rest of the runner the same size as the port that you just matched to the head? All the way to the top.

Basically I'm looking for a way to dramatically improve the flow of the intake, so much so that it can at least kind of compete with those aftermarket ones. Now of course, they're way better and you're never going to get one of these old iron boat anchors to be as good as a modern aluminum one.

[INSIDIOUS '86]

Your looking for this guy it seams. http://m.summitracing.com/parts/nal-14096011
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[INSIDIOUS '86]

I've seen once were a guy went though extreme lengths to take a performer rpm intake and tig welded all the numbers and such on the intake all to disguise it. Guy was an exceptional tig welder though. Haha. Or do what this other guy I know did haha. Hogging out an intake is much more involved than you would think. You can also look for marine intakes which are cast better and flow a little more as a good starting point increasing plenum up top by using a spacer will help a lot. Making it square bore and making the top look like a performer intake will yield good results. Internally your going to have to deal with the casting as is and maybe port Match and de flash the bottom ends. Block off the egr and heat riser ports and your prob at the max of the intake


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[geezer#99]

You want your stock intake manifold or exhaust manifold done. THen you're looking for
"extrude Hone".
http://extrudehoneafm.com/

[INSIDIOUS '86]

I would be almost worried that to smooth of a funish would be detrimental to fuel mixing. It's neat as hell though
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[mgchevyparts]

Extrude honing helps but you still have poorly shaped runners that aren't the best for power. Keeping in mind that head flow is most important, so if you have aftermarket heads to gain horsepower what does it matter the brand of intake since engine is no longer stock anyway. An improved intake alone on a stocker won't do much, if anything at all.

[SkinnyG]

I've heard of guys sawing the factory intake in half, porting it, then welding it back together and finishing it so it looks "as cast."

I've also heard of guys capping the intake and filling it with hydrosulphuric acid for a spell. The acid dissolves everything "bigger" and it still looks "as cast" inside.

In the effort vs cost end of things, unless I wanted to build a killer "cheater" motor, I wouldn't bother.

[Skunksmash]

Originally Posted by INSIDIOUS '86

I would be almost worried that to smooth of a funish would be detrimental to fuel mixing. It's neat as hell though
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Always wondered about fuel mixing, VS unimpeded airflow.

Originally Posted by mgchevyparts

Extrude honing helps but you still have poorly shaped runners that aren't the best for power. Keeping in mind that head flow is most important, so if you have aftermarket heads to gain horsepower what does it matter the brand of intake since engine is no longer stock anyway. An improved intake alone on a stocker won't do much, if anything at all.

So there is some low hanging fruit, if you just soup up your factory heads. You can still use the stock intake and gain some power.

Originally Posted by SkinnyG

I've heard of guys sawing the factory intake in half, porting it, then welding it back together and finishing it so it looks "as cast."

Thought of doing that. You'd have to cut it longways though. That would suck.

Originally Posted by SkinnyG

In the effort vs cost end of things, unless I wanted to build a killer "cheater" motor, I wouldn't bother.

That's kind of what I'm talking about. A motor that would appear to be all stock, from the outside. But the inside is all awesome. Well, as awesome as you can get with modded stock stuff anyway. How good have you seen "cheater" motors get? In my estimation, you wouldn't get much more than about 120hp more than stock, before you ran into the limitations. You would have to use the factory block, heads, valve covers, intake, and oil pan. But all the internals could be aftermarket.

And then no one would know! WAHAHAHA!!

[geezer#99]

THe mixing occurs in the carb. Smoothed and shaped runners speed up the mix in to the chamber. THat's why you port and polish. Rough surfaces slow down the mix and tend to seperate it.
Check these guys out for stock appearing cars. THey run some incredible times.
http://www.fastraces.org/