What do yall think of these intake manifolds?

[Skunksmash]

I would like to get yall's opinions on these intake manifolds. I am not sure how good they are, my only intake experience lies with late model mustangs. Which needless to say aren't TBI. The summit one can't be "50 state street legal" like the edelbrock is, cause it has no place for the EGR stuff. Also, will these hurt fuel economy in any way? It seems to me that they would improve it slightly, if this was all you did. Maybe i am wrong here. Also, you would be ditching a little weight with one of these intakes and a decent set of aluminum heads.


http://store.summitracing.com/partdetail.asp?part=EDL-2104&autoview=sku


http://store.summitracing.com/partdetail.asp?part=SUM-226016&autoview=sku

[Captkaos]

They are basically the same except Summits is Cheaper.

[Skunksmash]

What about the difference in MPG's as opposed to the stock manifold? Will this cause an efficiency increase, or a decrease. Just by itself i mean.

[autorepr]

The info I get when I go to your link shows both as carb'd non EGR manifolds. You mentioned TBI and EGR so are you scrapping the TBI and bolting on a carb? Are you getting rid of the EGR valve? Is it a daily driver or hot rod?

My two cents is keep the TBI and EGR is it's a daily driver. That will be your best bet for MPG and the EGR will help it run cooler and burn the fuel more completely. If it's a hot rod don't stop at just a manifold!!!!!! 

[Skunksmash]

The info I get when I go to your link shows both as carb'd non EGR manifolds. You mentioned TBI and EGR so are you scrapping the TBI and bolting on a carb? Are you getting rid of the EGR valve? Is it a daily driver or hot rod?
 

No it is not a hot rod, it is a daily driver that i will be using to get back and forth to work. And yes it is a TBI, but surely there is a TBI version of this intake. I have heard there is. I will not be changing it over to carb'd cause of today's gas prices. What i am asking is this: Will a good aftermarket intake (for TBI) such as an edelbrock decrease my MPG's? If that is all that is done. I mean i do plan on exhaust and any other upgrades that do not decrease fuel mileage, but i just want to know what effect only putting on a better flowing intake will have. What will it do in terms of MPG? What will it do in terms of power? What will it do if anything at all? Again, this is by itself, with no head work or anything like that.

[Captkaos]

If you are wanting to change the intake in hopes of gaining MPG, you would be wasting your money.  If you want to gain some mileage as discussed in the other thread, get a TBI spacer.

[Skunksmash]

Maybe i should go ahead and take this time to ask another question about intakes. To gain any power, you would need all the head ports to exactly match the intake ports, right? Or are the head ports normally already larger than a typical intake's ports?

[VileZambonie]

Port matching is a great way to make some free power. An aluminum intake is lighter and the runners will help promote some low end torque. If you are strictly looking for fuel mileage then I wouldn't just do an intake manifold but increasing volumetric efficiency will increase overall efficiency. Think of the big picture. If you do a mild cam upgrade, intake, exhaust etc you'll notice better performance and probably about the same mileage.

[Skunksmash]

See thats where im kinda confused. I thought as soon as you go doing any headwork such as porting the heads (even just port matching) that you needed to do a cam as well. Maybe someone can explain why or why not?

[Captkaos]

FYI, the factory TBI intakes were already aluminum.

[Skunksmash]

You know what i have always wanted to do? Try and fully port out a factory intake manifold to its max capability. Though i guess it would just be to hard to port the innards of the thing, huh.

[Skunksmash]

Capt, what intake would you use if you were doing a mild/street daily driver? If you were to go with an aftermarket one, that is. That edelbrock one seems really popular but that does not mean it's the best one.

[Captkaos]

What all are you willing to change and how mild are we talking?   Changing the intake and keeping everything else the same isn't going to help you any.

[Skunksmash]

Ok thanks. What set of mild aluminum heads would you go with? Some heads that are sold are so much more efficient than the stock ones that they give more power without even losing any MPG.

[Captkaos]

Lets start with this...
How much money do you have to spend?  Give us a budget.
What are you considering mild?  Are you after power or fuel efficiency (MPG)?

If you have a street driven truck and don't plan to hammer down on it all the time, the heads on it now are fine.  Aftermarket heads are going to flow more on the high rpm side as the stock ones were designed for max 5000rpm.  Aluminum would save some weight, but they are also expensive.