Exhaust manifold porting>>
#1
Exhaust manifold porting>>
Alright then, me and a friend were talking about porting and such and started to look around for sounds and such. Ive come to the conclusion, I wanna port my stock manifolds. Mainly for the sound it will give me, and if there is some added power, GREAT!!
But I have some concerns before I do this (im planning on starting this within a week BTW)
With the added flow, will there be any issues with running lean? Or could that just come from intake manifold porting? Is there anything I should know about this other than the porting process itself? I know how the porting is done alone, but Im asking if there is any "secrets" you all know of that would help me out or that I should watch out for or be aware of?
And my last question (I think), what do you guys think of the idea??
Thanks much all
PS, Im dead serious about doing this if you're wondering.
But I have some concerns before I do this (im planning on starting this within a week BTW)
With the added flow, will there be any issues with running lean? Or could that just come from intake manifold porting? Is there anything I should know about this other than the porting process itself? I know how the porting is done alone, but Im asking if there is any "secrets" you all know of that would help me out or that I should watch out for or be aware of?
And my last question (I think), what do you guys think of the idea??
Thanks much all
PS, Im dead serious about doing this if you're wondering.
#3
if your un experianced you should really look at a bunch articles and talk with someone who has done it to the same motor but gasket matching is always a quick and easy way to free up alittle airflow
#4
Dude, Ive been searching the last 2 hours and cant really find anything too specific. All im getting is its not a huge project and just to have a driving free weekend, is there anything else to it?? I have to belive its that simple. And I can accomplish this by rocking the engine right?? And as far as the porting (or port matching) thats nothing, Ive dont that once before on a cutlass with the rocket 307 I belive it was. Well, started to do it and just sold it to the junk yard.
Like I said, Im really just looking for some good tips and wanting all of your opinions on the whole idea.
And again, its not so much performance im looking for (although that would be cool) as much as Im wanting to get that sound out of it.
And, does anyone know about the crossover? What would the deal be with that? is that diameter large enough where I dont need to do anything?
HAHA! Sorry, I got another "and" I was told by somone (who really doesnt know what hes talkign about most of the time) that all you need to do is match the front manifold, does this seem correct or just plain stupid? I personally am leaning towards stupid, and im wanting to do it even if its not nessesary so i have the satisfaction of another thing done by myself you know?
Like I said, Im really just looking for some good tips and wanting all of your opinions on the whole idea.
And again, its not so much performance im looking for (although that would be cool) as much as Im wanting to get that sound out of it.
And, does anyone know about the crossover? What would the deal be with that? is that diameter large enough where I dont need to do anything?
HAHA! Sorry, I got another "and" I was told by somone (who really doesnt know what hes talkign about most of the time) that all you need to do is match the front manifold, does this seem correct or just plain stupid? I personally am leaning towards stupid, and im wanting to do it even if its not nessesary so i have the satisfaction of another thing done by myself you know?
#5
Alright then, me and a friend were talking about porting and such and started to look around for sounds and such. Ive come to the conclusion, I wanna port my stock manifolds. Mainly for the sound it will give me, and if there is some added power, GREAT!!
With the added flow, will there be any issues with running lean?
I know how the porting is done alone, but Im asking if there is any "secrets" you all know of that would help me out or that I should watch out for or be aware of?
And my last question (I think), what do you guys think of the idea??
And my last question (I think), what do you guys think of the idea??
There is a way to get around that- they have a process called extrude honing where they push this soft clay like material through (it contains abrasives)- and basically ports as it flows through; keeping the porting smooth, and porting around curves and such. The downside is it is expensive.
If I was looking to get some gains out of the porting, I would have to port the heads as well would'nt I??
However, if this is your first time porting- I'd scrap the idea of touching your heads. There is a lot to porting heads- and a lot of stuff you can do to make it flow worse if you don't know what you're doing. The airflow does all kinds of weird things making the turn coming in, and going around the valve- stuff you don't have to consider up in the manifolds.
#6
sound from porting? IMHO sound gain will be minimal realistically so will performance gains, with todays technology you may as well go get yourself a set of J/Y heads and get them cnc ported but IMHO not worth the money
#7
GREAT! Thanks, yeah, the whole deal I was asking about porting the heads was, I was wondering if I had to do that to see anything, wasnt planning on it.
If I mentioned intake porting, I meant exhaust...OOPS. But awesome, thanks alot.
Do you think it would be better for me to get a set of them from the junk yard to do this with??
If I mentioned intake porting, I meant exhaust...OOPS. But awesome, thanks alot.
Do you think it would be better for me to get a set of them from the junk yard to do this with??
#8
Another thing, even if there is virtually nothing changed, its somthing I wanna do cause the whole DIY factor (somthing I can say i customized) And cause It will give me a little more expierience. Also, cause I know its gonna change the sound a little at least.
#9
GREAT! Thanks, yeah, the whole deal I was asking about porting the heads was, I was wondering if I had to do that to see anything, wasnt planning on it.
If I mentioned intake porting, I meant exhaust...OOPS. But awesome, thanks alot.
Do you think it would be better for me to get a set of them from the junk yard to do this with??
If I mentioned intake porting, I meant exhaust...OOPS. But awesome, thanks alot.
Do you think it would be better for me to get a set of them from the junk yard to do this with??
Also, I always recommend getting a junkyard part to practice on. You never know if you might crack through or something- and don't want to ruin your only set.
Are your exhaust manifolds tubular steel or cast iron? The 3800's have a cast iron front and tubular steel rear. You can usually port a lot more in the iron ones because they have more wall thickness. But you need to be careful not to go too deep- remember those manifolds get super hot, and cool pretty fast after- so you've got to think about cracking later on.
Another thing, even if there is virtually nothing changed, its somthing I wanna do cause the whole DIY factor (somthing I can say i customized) And cause It will give me a little more expierience. Also, cause I know its gonna change the sound a little at least.
Any reason you don't just want to do headers?