Calling muffler mike

buddy · Post by **buddy** » Tue Nov 06, 2001 1:15 pm

Was looking on your site at "jim's turbo motor" and saw that the intake pipes are merged below the rear valance but on your exhaust system the manifold is merged at the turbo. What is the advantage's and dissadvantage of doing this apart from the lack of space when you have four pipes instead of one.

I was also looking at the standoff's used on jims engine are they homemade from just a peice of flat metal or is there more to them?

thanks

Ian

Muffler Mike · Post by **Muffler Mike** » Wed Nov 07, 2001 7:24 am

That?s a good question. I think for the average Joe, it?s not going to matter too much. What Jim had was Kawell?s street version. Very little trimming of the apron. Just a couple of little notches. Nice, clean and simple.
When it comes to the collector at the turbo, I have heard of stuff like getting individual pulses right into the turbo that assist in what ever. Like my exhaust housing is actually divided in two section inside. What this all means? I don?t know yet. This is one area I just left to the experts. BUT I would put money on it that the collector at the turbo will make more power. (more boost) And the only reason I say this is all the HIGH end set ups that I have seen, are this way. But how many of us are looking for 25-30 lbs of boost. Not me, im only running 7 at sea level and 10 at altitude. (so far) But mine is more then capable of seeing 20 at the turn of a knob. (that?s a beautiful thing.)
Maybe some one else can elaborate on this subject.

As for the sand off?s, your right, they were just ¼?x2? flat bar. I put a kink in them just passed the mounting point and drilled the appropriate holes in them to use the stock mounting plates at the body and we popped out the pin out of the hinges in the lid and used removable pins.

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Muffler Mike
www.MufflerMike.com

Red-one · Post by **Red-one** » Wed Nov 07, 2001 1:24 pm

The reason for having the collector merged at the end next to the turbine is to mantain the pulses of the engine flowing as fast as possible(smaller tubing ti'll end just before turbo) rather than using a merged header with a large big pipe ti'll turbo.(Will cause pulse flow slowdown but will clear apron). Mike uses a twin entry turbo designed for fast spool-up as for the same reason.
Hope it helps.
BRGS

Searoy · Post by **Searoy** » Wed Nov 07, 2001 1:28 pm

When it comes to the collector at the turbo, I have heard of stuff like getting individual pulses right into the turbo that assist in what ever. Like my exhaust housing is actually divided in two section inside. What this all means? I don’t know yet. This is one area I just left to the experts. BUT I would put money on it that the collector at the turbo will make more power. (more boost) And the only reason I say this is all the HIGH end set ups that I have seen, are this way. But how many of us are looking for 25-30 lbs of boost.

Supposedly the divided exhaust housing of the turbo helps isolate the pulses of exhaust from each other. The idea is to maintain high velocity of the gasses. If it were an open housing the exhaust gas pulse would have to expand to fill the exhaust housing, and then any remaining pressure would turn the turbine. Velocity is everything in a turbine. Every ultra-performance turbo setup I've seen has the collector just before the turbo.

In a street sedan a merged collector under the apron with a single pipe going ot the turbo is more practical. The header that places the turbo under the apron too is way cool, and could be the best of both worlds so long as there aren't too many twisty turns in the exhaust pipes to route them that way. The more I see Jim's old engine the more I like it. I like it a lot!

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*** Teach a Man to Fish ***
Searoy

"I tend to lean toward a tighter gap and a
looser skirt....a little slap never hurt." -- Joe of the West

enticer · Post by **enticer** » Thu Nov 15, 2001 10:41 pm

They call it a 'split pulse' exhaust housing

Marty · Post by **Marty** » Fri Nov 16, 2001 7:45 pm

No, its called a "Tangential" divided skroll housing. What the hell that means is beyond me but its split.

enticer · Post by **enticer** » Sat Nov 17, 2001 4:23 am

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Marty:
No, its called a "Tangential" divided skroll housing. What the hell that means is beyond me but its split.<HR></BLOCKQUOTE>

What you have said is very true...I was calling it by the 'workshop' name.

In regards to what a tang/divid housing.....

There are a few different styles of exhaust housing.

1st - is what you have stated, the tang/divided

2nd - the tang/undivided

3rd - the on centre

Marty · Post by **Marty** » Sat Nov 17, 2001 9:55 am

Nice pics!
On center is easier to make fit for me.