where are the exhaust scientists

Maybe the increase from 2.25 pipes to a 2.5 "X" pipe has something/a lot to do with it then.

 

Buy some real mufflers.

 

Such a simple observation, yet so profound. Thanks.
Do you have any input on the whole rear mounted "X" pipe topic?
I respect your opinions Mr Waters.

 

I did alot of experimenting.....

Best sound I found was a box shaped H pipe just in front of the rear axle.

 

All this exhaust talk is so....exhausting. I love it when all the experts come out. It's a 307 cube motor. Just put a nice exhaust system on it and call it a day. Paint the pipes? I caint count how many times I've heard that one. Simply bend the pipe so it's nice and snug to the floor, put the mufflers where they fit, stick an X or H pipe in it or not and call it done. If you had a 500 plus cube stroker, it might be worth a little extra effort.

 

Rob, you may find the several links in the below thread interesting. Then again you may think its completely useless and only further exhaust you.

http://www.jalopyjournal.com/forum/showthread.php?t=737874

 

There always has to be a Critic in the crowd don't there?

 

Interesting stuff here. I've been thinking of an X-pipe for my dailey (LT1 Caprice wagon) just to see if it makes a difference sounds wise and for mileage. Thanks!

 

Not everyone realizes or cares.
Now personally i think the less you have, the more important it is to get the most out of what you have. What I mean is that a 500 inch stroker can afford to leave a bunch on the table, but a 307 needs to make the most of it. To say a 307 doesn't deserve some attention is silly.
This is a pet project of mine and mostly because the 307s can be had SO cheap because of the negative stigma they have.

Now if anyone wants to talk 307 specific do it on this thread >>> http://www.jalopyjournal.com/forum/showthread.php?t=706094


.

 

Certainly the devil is in the details with the rest of the system when regarding what a crossover (X or H) will add, but remember the 10+ horsepower Shelby was talking about was on a 289 CID car.

 

This is what the box shaped H pipe, located right before the rearend sounds like on a six. Not to loud, but definite rumble without the six rap. Totally kills the rap.

It really sounds like a beast, imagine that on a V8.

 

A rodder would experiment as you have Vicky. To investigate the config. that makes 'proper' sound is helping all of us who build.
Matching this w/the power available sounds even better.

 

Thanks pitman!
Bishop, any pics of this box H ? Mufflers in that or no ? that does sounds good for sure

 

No muffler at all. Just run your two exhaust pipes side by side, the size of your pipe will determine the height of your H. The width the two pipes are from each other will determine the width, Then make it 6 inches long.
It ends up looking kinda weird, but if your not looking for it... its like its not even there.. If it was behind the axle it would be hideous.

 

When do we talk about 180 degree pipes?

 

You mean 180* headers or 180* U bends for side pipes ?
There's a few 180 header threads

 

Amazing sound from a six!

 

I meant the headers, and the changes in flow characteristics.

 

Just so I'm clear, 31. When you say "X" pipe, you mean X-shaped, as opposed to an "H" or "crossover" pipe...correct? Thanks.

 

"Traditional" hot rods didn't have H-pipes. Or X-pipes either.

 

http://www.evoperform.com/shop/inde...id=345&zenid=e4fc65fc34fa67bad6771caf870b9bc7

This is the bassani X pipe I'm talking about .
Its mounted narrow side to the rear, back at the bumper.

There is an (24" from the headers) H cross over just behind the trans cross member.

 

Prove it -& then I'll tell you about Carroll Shelby and his ideas on them and when he had those ideas

 

On second thought, we had something similiar. We called it a "single exaust with fake dual outlets". What's the point of having duals if they're going to be hooked together? A big diameter single would sound and perform the same.

 

Nobody ever said the 307 didn't deserve anything. Show me where I said that. Simply put, what are you gonna do with it? Try to make money racing at your local dragstrip? If so, knock yourself out tweakin the exhaust to your heart's content. Lemmie let you in on a little secret. Small cube motors (under about 330 cubes) show benefit from a well thought out single exhaust. You ever heard of a Flowmaster Scavenger "Y" pipe? Those things suck exhaust comin and goin. You come off headers with 2.5" pipes into a 2.5 to 3" Flowmaster Y and out with a single 3" system, and you'll be amazed. Duals are just too much for most little motors. You really wanna talk exhaust or are snyde remarks all yall are good for?

 

I'll add to that. I talked to Doug Thorley at length about crossover pipes in general. He said he'd run dyno testing in every kind and found minimal improvement. He said he thought the only thing they were good for was making the exhaust sound like shit. Direct quote. I would be careful buying anything that big time magazines push simply because their opinions are bought and paid for. You build what you want how you want, but there's more than one way to skin a cat.

 

See...check these out.

http://www.flowmastermufflers.com/s...Accessories&sc2=Scavenger YCollector&sc3=&sc4=

Those thing suck and flow like a whore in church. You have the scavenging effect of the headers, PLUS the huge scavenging effect of that Y pipe. An X or H simply cannot compete. And they can actually hurt smaller cube motors like yours simply because the flow is not there to begin with for a dual system.

 

These guys just don't get it. They never will.

They wouldn't get your header helix idea either.

You could drown out their negative waves with a good exhaust thumpin'.


<a href="<iframe width=" 560"="" height="315" src="http://www.youtube.com/embed/0AEj3LA2vSo" frameborder="0" allowfullscreen="">"><a href="<iframe width=" 560"="" height="315" src="http://www.youtube.com/embed/0AEj3LA2vSo" frameborder="0" allowfullscreen=""><iframe src="http://www.youtube.com/embed/0AEj3LA2vSo" allowfullscreen="" frameborder="0" height="315" width="560"></iframe>

 

Thanks rob, I'll look into those and a single exhaust too.
I did do the flow calcs to come up with 2.25 pipes, that wasn't a guess. I'll also say there is plenty of velocity and temperature at the tailpipes.
The point of this thread was to expound on the thread I linked in the first line of the first post.
I don't know if you saw that thread prior or looked this time, but I'll assume not.

 

Yup. I saw it. I was just makin sure you knew there were alternatives. Everybody is crazy about puttin duals on everything...and sometimes it works out. But it's not needed everytime. Das all. Maybe I can polish up my delivery a little. lol

 

Just trial ran a splitter, on my newer 4 banger. The change in tone was remarkable.
Welding it in tomorrow. Image is from flowmaster. I'm using std straightpipe.

Used the drawing that Riprap posted #26. worked out great, thanks!