pixeldev

I am determined to get at least 5 inch exhaust. Preferrably 6. I have a supercharged big block 355.

Where can I find this type of exhaust? Stainless preferred. Does anyone know ANY vendors? Or will I have to get it made custom?

Is it true the bigger the exhaust, the louder the noise?

18inchboyds

awesome , just awesome . You have a sc big block 355, u sure about that or is it a small block . And a 6 inch exhaust , maybe a 6 inch tip . Theirs no way you need a 6 inch exhaust . If your car has like 2k hp then just run hedders and thats it , but their are tons of car with 3 and 4 inch exhaust . Mufflex makes a 4 inch exhaust . The only way you could get 6 inch is if you got something from the diesel truck market . And then it isnt gonna fit very well. I think you just being a dork ,so ill be one too, lets see your bb 355 that needs a 6 inch exhaust . I want some pics .

pixeldev

Ill get pics monday. I just bought the car a month ago, and it NEEDS to pass the etest so its getting a temporary cat on it, and smaller jets. But after that the big jets are being put in and im putting a new exhaust system in it, stainless.

Like I said, im not going any lower than 5, im stubborn, when I say im getting atleast 5" exhaust... I am.

But anyways, do you know where I can get that? Someone has to sell it. Oh yea and I read on a website that 6" is for 550+ HP but ofcourse thats a bunch of bull****, but I beleived it for a second.

The engine is a SB. Ill take pics on Monday for you.

18inchboyds

well i smell bs on the 355 bb .but , their is like no room for 5 inch exhaust , unless your car sits like stock and is wicked high or you raised it .

http://www.portadiesel.com/products/60l/exhaust4.html
http://cgi.ebay.com/ebaymotors/ws/eB...category=33630

firebirdjosh

iTrader: (1)

True duals is the only thing that will fit and flow the same amount of air.

pixeldev

Actually... I was just thinking (which I dont do often) and remembered my headers come down into one big one on the passenger side... therefore. I think I am going to fabricate a 5" side exhaust for it just on the pasenger side.

What do you guys think?

mw66nova

iTrader: (13)

i think you are an idiot and that you will never need a 5" exhaust. plenty of people are DEEP in the 9 second time range in the 1/4 with 4" exhaust. and, a dual 2 1/2" will be MORE than you'll need. there simply isn't enough room under these cars for that kind of exhaust.

i'd like to know a bit more about your combo so that i can determine:

a) what you think you know about your combo
b) what you actually know about your combo
c) what i need to tell you to get where you need to be with your combo.

pixeldev

I dont care what you think, get off my post.

And I usually get the chicken mcnugget combo.

If you dont have anything nice to say, then dont say it.

DanTheMan_smlk

when u start getting 6'' or bigger exhaust, u better keep kids away cause they might get their heads stuck in it ...just give it a good ol' rev and they pop out

pixeldev

LOL. You the kind of guy I like to hear, not the idiot above.

Thanks for making my day better

DanTheMan_smlk

lol, no problem man

vejatabul

the smallest bigblock chevy made was the old "w" series motor. it was a 348ci, but seeing as how it is nearly impossible that someone was wierd enough to put a w motor in a thirdgen, i would say that your car is a small block.

im not going to flame you, you have already been subjected to it by my friends.

but......

if the person who sold you the car told you it was a big block, and it is not, then how many other parts on the car are not as the previous owner said they were?

my advice would be to fabricate the side exhaust like you mentioned, but if you have short tube headers(probaly 1 5/8 primarys) that use a 2 1/2 y pipe, how much power do you really think going to a 5 inch exhaust will give you? are you doing this strictly for the idea of haveing 5 inch exhaust? if you are, then go for it, im not one to stifle creative ideas because they go against the norm, but i would if they are rediculous and mis-informed

you should expect to see quite a bit of flaming if you continue to post things that are not logical. it tends to make you look like an un-knowledgeable person...... im not implying that you are, just this is the opinion others will form.

Apeiron

If it has Vortec heads, then it's not a big block. It would be closer to 8.1L than 5.7L if it was.

pixeldev

vejatabul: If your froend would of said what you did I would of been very nice. But he flamed me and called me an idiot, so he can grow up...

Anyways I dont know much about engines, I am an auto body person. So I guess it is small block then, I didn't know that. Im doing the 5 inch pipe to be unique and noisy.

Also a cat ****ed up my car so I will never use one again... well atleast on this cat. So I hate cats and small restricting exhaust pipes (not that 3.5 inch is small, its very big). But like I said im mainly doing this to be unique.

Thanks for a nice, non-flaming reply

pixeldev

Ohhh ok, thanks I don't know these things, however I do know almost everything there is to know about bodys and body repair

Now I know

Apeiron

FYI, the quickest way to tell the difference between a BBC and SBC is to look at the exhaust ports on the heads. The BBC has equally spaced ports, while the SBC has the middle two ports on each side next to each other:

<pre>BBC: o o o o
SBC: o oo o
</pre>

pixeldev

WOW you guys are so helpful!!! Thanks so much Apeiron, ill always know now! Thanks guy

ShiftyCapone

iTrader: (7)

I would expect a large power drop with an exhuast that big. Even semi trucks with 600 hp and 1500lbft of torque don't have pipes that big. Your motor will never pump enough air to make use of that exhaust. You will have terrible scavaging and eqaully misserable velocity. You won't find 5" pipe that easy because no one has a vehicle that needs it. There may be better ways for you to be unique. Throwing miss matched parts at a car is not a good way of expressing yourself in a postive way.

DanTheMan_smlk

why not just make a cut out rather than 5 inch exhaust...how much of a difference would it make...just dont go ric3y with it

pixeldev

Cut out?

And thanks ShiftyCapone I didn't know that. Hmmm. 3.5 would be good for a 355 SB Supercharged?

BulliTooth

kids head stuck in pipes thats killn me lolol. mufflex makes nice 4 inch cat backs

vejatabul

i have a 4inch mufflex.

hey shifty i have a question, why would scavanging the exhaust have anything to do with what happens 40-50 inches away from the cyl head and 35 inchs away from the collector. it has been proven that the scavangeing affect is only relitive to header design and if he has a shorter header then the effect is lessened. scavanging is not happening 2 foot away from the colector on a single exaust car. if he had a cutout or if he had 5 in exhaust there would be very little difference in restriction.

mw66nova

iTrader: (13)

hey man, you know, you asked what i thought:

i told you what i thought:

i think that instead of coming in hear with the, I NEED 6" EXHAUST post, and actually SEARCHING through even the first page of threads that you would see that you:

a) can run dual exhaust on these cars without issues
b) if you do decide to go with a single large exhaust then you will see that 3" is large enough for most of the cars on the boards here, and that 4" would be large enough for cars way faster than yours.

you see, just by adding a supercharger to your car does not mean that you all of a sudden need huge exhaust. in fact, forced induction in general like smaller exhuast to keep up the velocity.

sorry that you took my comment so literally. i was JOKING! frickin'-eh man. sorry that i get so frustrated answering the same questions OVER and OVER and OVER again. do a little research on the subject next time before asking something ridiculous like "Hey do i need 6" exhaust?" seriously, where would you even put that?

pixeldev

First of all, I did lots of searching for 5" and 6" exhaust and I didn't find anything. So I made my own post. Secondly, I wanted to get 6" exhaust to be unique, how many cars have you seen with that?

However I recently learned that there are performance decreases with larger exhaust if you dont have the right HP/Torque.

mw66nova

iTrader: (13)

dude, uniqueness is dumb when it comes to performance stuff. stick to the basics and leave being unique up to your body panel expertise. you don't see 5-6" exhaust under cars cause you'd have to have a frickin foot of clearance to be able to drive the thing without scraping on everything.

instead of searching for 5-6 inch exhaust, you needed to be searching for what would be sufficient for your combo.

pixeldev

Alright, mw66nova. Thanks for explaining more, although at the beginning I didn't know how much it could affect performance. But its still weird I saw the site that said, 6" exhaust is for 550+ HP. Most be a BS site... Thanks, and your forgiven. Talk to ya tomorrow,
night

CaptPicardsZ28

[QUOTE]Originally posted by mw66nova
i was JOKING! frickin'-"eh" man. [QUOTE]

You must be from da Canada to then eh? I think the biggest I would certainly go is 4" and thats if you got the horses to justify it.

mw66nova

iTrader: (13)

nope, live down here in Georgia, but got tons of friends from Canadia.

TopleZZ candy

just tie in a bunch of these

Token

this thread made me laugh. thanks guys.


as stated, there is absolutely no reason to make such a huge exhaust. With a supercharged small block you could get away with 3" and not suffer that bad. I'd look into that 4" mufflex though, if you want something so big.

pixeldev

Im almost positive that I am going to use side exhaust. I saw some at summit racing.

So how exactly does a bigger pipe make me loose HP?

Token

Velocity versus Volume.

PhLaXuS

I'm cracking up imagining a tube of coffee cans under a Camaro giving birth. CrAzY stuff, man...

Anyway, if I didn't mess up my 8th grade math (Normally pretty good, but I can't think today) here we go for cross-sectional areas of different sized pipes:

2.0" = 3.14"
2.5" = 4.91"
3.0" = 7.07"
3.5" = 9.62"
4.0" = 12.56"
4.5" = 15.90"
5.0" = 19.63"
5.5" = 23.75"
6.0" = 28.26"

NOTE: I did not take into account pipe OD - material wall, etc...I simply acted as though the above were exhaust pipe IDs.

As you can see, a small increase in exhaust pipe ID greatly increases the cross-sectional area which COULD increase flow. The "could" is mainly attriibuted to the aforementioned decrease in scavenging. Just as Token said, if you have a huge volume (or cross-sectional area for this example) in which the gases can flow, the velocity will fall accordingly UNLESS your engine is putting out enough gases to need the extra volume. Also there are other factors such as a larger pipe has much more surface area in which to act as a heat sink for the exhaust gases, further slowing them even more...

Apeiron

Imagine pushing marbles through a garden hose. If the hose is a little bit bigger than the marbles, they'll go through with no problems, putting more marbles in just pushes the ones already in the hose out the other end. Because the marbles stay in a nice orderly arrangement, you can move a surprising number of marbles through in a short period of time.

If the hose is too big though, the marbles don't stay in an orderly arrangement. If you try to shove marbles in too quickly, they can wedge each other against the sides and jam things up so you can't get anything through unless you push more marbles in hard enough to break things free.

This isn't a perfect analogy, since marbles obviously aren't made of a compressible gas, but it should give you a bit of an idea.

pixeldev

Ohhh thanks guys im starting to get it So what is the perfect size exhaust for my engine?

PhLaXuS

You'll have to post a bit more info on the engine & induction in order to know what would be good. Post as much as you can find out.

A 5"-6" exhaust would KILL power, but I do imagine it would sound very strange...maybe like that part in Jurassic Park where the T-Rex first escapes and stomps everything to pieces.

Token

I'd say 3.5" to 4" for a supercharged 350. You could even run 3" with a cutout if you wanted.

pixeldev

What is a cutout BTW? Searched the forum all I saw was cutouts but no one explains them

Token

it's pretty much exactly what it soudns like. It goes in-line with your exhaust, usually before the cat, and you can open/close it when you need power. There are manual ones and electric ones. They run from $20-200 depending on which you get of course.

http://store.summitracing.com/egnsea...=KeywordSearch

RS Chris

Try this place for a good setup,

http://www.mufflex-performance.com/

A lot of guys run these setups and like it.

Tyler88

So how exactly does a bigger pipe make me loose HP?

As gas expands, it gets cooler. Cooler gas is denser. The denser the gas is, the harder the engine needs to work to keep pushing it along.

deracer

I havent laughed that hard in years...too bad he needs stainless

84RIceEater

You dont know nothing about your own car......a ...6" ....i want you to think about it................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................Done?........why would you need that? show me a car w/ it... besides desiel trucks and maybe semi's. then i want you to look at their HP/TQ then compare to yours. and tell me why you are at the level? i dont want to sound like an A$$ but your making yourself look like one.


The biggest Small Block Chevy that i heard is a 454 from "HardCore"

http://www.worldcastings.com/docs/03...es.pdf#search='454%20small%20block'

Crusin' 1980's

I thought a 454 was a big block?

Apeiron

Normally it is, but a 4" stroke in a 4.25" aftermarket small block casting is also a 454.

84RIceEater

i dont think chevy produced a small block bigger than the 400.. but then, some aftermarket companys started to bore and stoke and blah blah blah to them. make there own engines.

84RIceEater

BTW... your Sig says you already have a 3in exhuast...... are you not happy with the performance of that? what brand is your mufflers?

vejatabul

biggest small block i have heard of is a 472ci. sonny leonard makes huge sbc's.

now here is the real problem with the garden hose/marble analogy...........

are the exhaust gas molocules the same size as the inside diameter of a 3 inch exhaust?

no.

what about the inside diameter of a water hose?

no.

how big are they?
microscopic?
i would guess then that a slightly larger than microscopic inside diameter exaust pipe is needed......


.......or
that you can not use that analogy, because it is stupid and marbles dont expand and contract, nor are they condusive to velocity(speed and direction). next time say that the pipe is larger than the space needed to effectively provide a path for the exhaust gas to pass. the kid is not stupid, he just needs to know the reason why it wont work. giving an analogy does not educate him as to why that is too large of an exhaust. it just gives him more abstract thought to try and make sence of.

on top of that, whos to say it wont make more power?
have you ever tried it?
have you seen it attempted?

people told us 4 years ago that a .591intake/.569exhaust with 236in dur/226ex dur on a 113 lsa would be too much cam for a stock ls1/ls6 long block.
we responded with 417whp ls1 and a 432whp ls6 with stock heads on each. now people put cams with well over .600 lift and over 250 dur on stock short blocks and make 440+whp.

just because some internet people theorize that something wont work, does not mean that it is definitive. most on this board have no clue, they just regurgitate what they have heard in the past.
im not trying to flame anyone, just lighten up with the harsh treatment to newbies, and answer there questions/give sugestions in a helpfull manner. do you really think they will take what you say and use it if you are rude and self-rightous?

vejatabul

you just used adouble negetive. you told him there is nothing about his car that he does not know.....i want you to think about it

84RIceEater

"Ohhh thanks guys im starting to get it So what is the perfect size exhaust for my engine?"
I THINK HE GOT THE POINT... WE CANT REALLY TYPE THE WHOLE SCIENCE ON EXHUAST! TRY TO EXPLAN TO HIM W/ OUT USING AN ANOGLY! I WOULD LOVE TO SEE......C'MON.....

I AM BASICALY ASKING THE KID TO RETHINK HIS WHOLE QUESTION IN THE 1ST PLACE, WHEN HE HAS A
"3 IN STAINLESS" EXHUAST, THAT SHOULD BE ENOUGH AND HE SHOULD ALREADY KNOW THIS IF HE HAS A SUPERCHARGED 355.....(BIG-BLOCK) AT THAT. ITS HIGHLY UNCOMMON THAT SOME ONE DOEST KNOW WHAT THEY HAVE. INLESS THEY BROUGHT IT FROM SOME ONE ELSE. OR NOT TELLING THE TRUTH..




I dont mean any dissrepect.



would you belive me if i sayed i had a 572 SB that has 9'(FOOT)
exhuast and a 10 speed mountian bike gears that ran 4's?



all i am saying its not adding up. it may very well be true and i am the dumbA$$ on the other side typing. away looking like a JackAs$


Once agian i am sorry.