Just curious if anyone here uses this on a street driven application. What are the real gains of using an expansion tube in an exhaust?

 

mmm me like.
the megaphone puts the Bernoulli's principle to work.
if done right, that will increase the velocity and decrease the pressure of the flow.

 

is anyone using this with any street header and exhaust?

 

The Toda header has this cone section built into it.

 

i haven't seen any h22 headers with this before, so i was thinking about adding it when i finally get a header

 

wonder what would happen if you made your test pipe like that?
Just thinking cheap and easy to do Instead of trying to hack up your header

 

the megaphone/expansion tube has to be off the collector to be of any use, if its further down the exhaust, it would probably make performance worse

 

Well I back to back dyno'd my civic using an open header, a reverse coned megaphone and a half length'd exhaust.. I gained about 2-5whp the whole way with my megaphone set-up..

 

look at the stinger exhausts old beetles use
same idea

 

yea, thats where i saw them before. Its only about $40 for the 2 pieces so i think im going to try it out

 

Let us know how it works out...should be interesting. On a side note, I'm toying with the idea of using this on the exhaust coupled with a exhaust-propelled crankcase evac system...the topic was covered before, and I have yet to try it out. Thoughts?

 

now that would be interesting. Just a question though, would that not leave a lot of oil residue in your exhaust, that would in turn, burn, making you puff blue smoke? Just curious, sounds interesting.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B16B &raquo;</TD></TR><TR><TD CLASS="quote">i haven't seen any h22 headers with this before, so i was thinking about adding it when i finally get a header</TD></TR></TABLE>

The SMSP H22 has a slight megaphone quality after the last collector. Just FYI

Pirate

 

that header, probably the #1 or #2 header on the market depending on your specific set-up, costs over $1200. Currently that is a touch out of my price range, but a hell of a nice piece. Bump for something i wish i could afford

 

Superjunprelude just got his for $900. Still not cheap but hey...

Pirate

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B16B &raquo;</TD></TR><TR><TD CLASS="quote">now that would be interesting. Just a question though, would that not leave a lot of oil residue in your exhaust, that would in turn, burn, making you puff blue smoke? Just curious, sounds interesting.</TD></TR></TABLE>

Yes, you have a point, in which case a catch can would be incorporated into the system: the hose would draw from the valve cover, through the can, then on to the check valve that is welded onto the exhaust...

 

now this is why I like this board... every once in a while something interesting comes up

 

I wanna know more about this also.

 

So nobody is using the megaphone setup on the street?

 

Here is a set of my headers.That has a megaphone on it.For the street.What I have found with the reverse cone on multi cyl. engines (more than 2)
is that it sounds better when you get out of the gas.And that it keeps the cone round.Other wise the end will distort and crack from vibration.I can't find any H.P.ups or downs with the reverse cone.But on a single or twin it makes a big difference on the whole power band.It comes in sooner and smoother and goes up longer and harder(dirty mind).I am A firm believer in Megaphones though.I put them on everything.I have a 25cc Ryobi that I ground the cam and welded the top of the piston up for more comp.,made an allum. rod,welded up and raised the ports and runs on 60% NITRO and it even has a megaphone.(its for a 1/4 scale sprint car and man does it POP and BANG for such a little motor)

 

RMF, a quick question, why doesn't your header's megaphone reduce down to a smaller size like this one shown here? i know nothing about headers so school me..

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B16B &raquo;</TD></TR><TR><TD CLASS="quote">
</TD></TR></TABLE>

maybe its just me that i can't see it? and why doesn't more people use this on street driven applications, i see it on full-drag cars but never heard of on daily drivers..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RA004E &raquo;</TD></TR><TR><TD CLASS="quote">Let us know how it works out...should be interesting. On a side note, I'm toying with the idea of using this on the exhaust coupled with a exhaust-propelled crankcase evac system...the topic was covered before, and I have yet to try it out. Thoughts?</TD></TR></TABLE>

Sorry for going OT... I've also heard of this before too, Keep me posted, I'm intrested.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ri_rv &raquo;</TD></TR><TR><TD CLASS="quote">RMF, a quick question, why doesn't your header's megaphone reduce down to a smaller size like this one shown here? i know nothing about headers so school me..

maybe its just me that i can't see it? and why doesn't more people use this on street driven applications, i see it on full-drag cars but never heard of on daily drivers..</TD></TR></TABLE>

good question...

 

We don't recommend running megaphones on street driven cars becasue the megaphones are made out of thin 20g material therefore you may have some failure issues.

Megaphone usually will function great either way especially when matched with p-roper sizing and a reverse cone. Alot of the items you guys referred to in the pictures are not megaphones just transtitions to the correct tailpipe size that the engine requires. Usually the collector chokes down to say 3" (for round numbers sake) and it will transition up to 4" for the tailpipe. &lt;-- numbers do not necessarilly apply to a honda

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jon V &raquo;</TD></TR><TR><TD CLASS="quote">So nobody is using the megaphone setup on the street?</TD></TR></TABLE>

See joestypes search his archived stuff i did a great header design for him with a reverse cone megaphone for the street yielded about 15 HP

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ITRacer121 &raquo;</TD></TR><TR><TD CLASS="quote">wonder what would happen if you made your test pipe like that?
Just thinking cheap and easy to do Instead of trying to hack up your header</TD></TR></TABLE>

MEgaphones are not meant to be an after thought they should be included in the original design of the header. Factors such as collector outlet size primary length engine parameters all have an affect on how we size our megaphones