[DeTomaso] Speaking of exhaust systems...

[gow2 at rc-tech.net]

No tuned length. I am working off some ideas here. When I made the last
set cylinders were improperly matched:

http://www.rc-tech.net/cars2/ts/eh/ex1.jpg
http://www.rc-tech.net/cars2/ts/eh/hp.jpg

They were 2 into one but you cannot properly match 2 into one with out a
cross over. The effects were devastatingly bad; which is good for learning
some times.

I am not 100% on board with the benefits of equal length headers unless it
is a 180 degree system. You will always have one cyl off unless you cross
over. My goal was to delay the joining all 4 as long as possible.

I also believe changes in back pressure, an equalization of the system
some times give scavenge more credit then is due. I doubt few will agree
with me but that's fine; that's why I like to play.

So my goal here was the longest time before all cyl join given the most
even pressure. Second, I built in a butterfly so I can play with the
effect of back pressure:

http://www.rc-tech.net/cars2/ts/eh/ex3.jpg

G



> An interesting design. The way the primaries enter the muffler I assume no
> scavenge effect can be expected. Are the primaries in some way tuned to
> length/dia for a specific rpm or rpm range?
>
> Tomas
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com
> [mailto:detomaso-bounces at realbig.com]On Behalf Of gow2 at rc-tech.net
> Sent: den 26 februari 2012 14:46
> To: MikeLDrew at aol.com
> Cc: detomaso at realbig.com
> Subject: Re: [DeTomaso] Speaking of exhaust systems...
>
>
> I have a radically different exhaust system I hope to try this spring.
> Instead of going through the suspension it is routed over the suspension.
> It is collected late in a home built muffler (not pretty) with a butterfly
> to change back pressure. I am not going to coat it till I run it on the
> engine. This was mockup before the car was painted:
>
> http://www.rc-tech.net/cars2/panttransam/1905/ex/exh3.jpg
>
> http://www.rc-tech.net/cars2/panttransam/1905/ex/extry2p.jpg
>
> http://www.rc-tech.net/cars2/panttransam/1905/ex/extry2q.jpg
>
> http://www.rc-tech.net/cars2/panttransam/1905/ex/exh2.jpg
>
> http://www.rc-tech.net/cars2/panttransam/1905/ex/exh1.jpg
>
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