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 New Custom Briggs Opposed Twin Exhaust?

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Doc Sprocket
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Thunderdivine
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PostSubject: New Custom Briggs Opposed Twin Exhaust?   New Custom Briggs Opposed Twin Exhaust? Icon_minitimeJune 30th 2013, 5:24 pm

I'm making this mostly cause of lack of space on my racer, but also cause i think it will sound sweet.
What do you guys think?

A 3" Pre-chamber that will connect two 2" pipe that will come out below as straight pipes.
New Custom Briggs Opposed Twin Exhaust? 8E4E7866-D0B8-4658-9D69-99CCA644F2FB-45700-00000DD3BAFC7E7F_zps3b93c29b


And two 1-3/16 pipe interconnecting the two cylinders (so they talk to eachother).

New Custom Briggs Opposed Twin Exhaust? CB234236-1EE0-4616-8A0F-FFF1E642C740-45700-00000DD3CA89DEA5_zpsa61b1fc9

New Custom Briggs Opposed Twin Exhaust? 8290A6A4-B99F-46BA-B60F-D6F8385D5F36-45700-00000DD3D12C09C7_zpse2f52a95

The 3" pipes end will be getting some end caps.

And I see many benefits of having those two connectors. Then I can run two side pipes when I want, and only one if I want. I can implement a new muffled set if i need too. A stacked set, endless possibilitys Razz
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Doc Sprocket
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PostSubject: Re: New Custom Briggs Opposed Twin Exhaust?   New Custom Briggs Opposed Twin Exhaust? Icon_minitimeJune 30th 2013, 7:06 pm

I think it'll look decent, but I'm not sure about flow/scavenging. Seems the gasses will have a sharp 90* or two to go through, unless I'm envisioning things wrong.
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Thunderdivine
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PostSubject: Re: New Custom Briggs Opposed Twin Exhaust?   New Custom Briggs Opposed Twin Exhaust? Icon_minitimeJune 30th 2013, 7:39 pm

Like this quick sketch,

Left is viewed from the front,
Right is sideview, the red is the exhaust blue scribed is the frame.
The 3" pipe will fit between a stock mower frame.
Then Two 60* pipes will be side pipes.

New Custom Briggs Opposed Twin Exhaust? DAA5C6B9-D52B-4F32-93FF-2855E7607D6A-52577-00000FEC27F8DB63_zps5d15f2ae
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PostSubject: Re: New Custom Briggs Opposed Twin Exhaust?   New Custom Briggs Opposed Twin Exhaust? Icon_minitimeJune 30th 2013, 7:44 pm

i think it will work good, and it should give a good sound, the drain hole is a good idea
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TroyBilt Pony
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PostSubject: Re: New Custom Briggs Opposed Twin Exhaust?   New Custom Briggs Opposed Twin Exhaust? Icon_minitimeJuly 1st 2013, 11:15 am

I always here.of the racers running two into one exhausts but idk why lol
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PostSubject: Re: New Custom Briggs Opposed Twin Exhaust?   New Custom Briggs Opposed Twin Exhaust? Icon_minitimeJuly 5th 2013, 1:49 pm

TroyBilt Pony wrote:
I always here.of the racers running two into one exhausts but idk why lol

Cause cylinder 1 and 2 share block i guess, so they like to "talk" to eachother on all ends. On the opposed intake is shared, so should the exhaust i think.

Will need a Stereo Camcorder for the final test of how it really sounds tho.

New Custom Briggs Opposed Twin Exhaust? C265BD29-CA28-42CD-B179-141AD6F5A9EA-62233-000012CF6F93924C_zpsd8e0b4bf

New Custom Briggs Opposed Twin Exhaust? 06426BA6-2EE9-453F-9AD2-6653058822B9-62233-000012CF667234EC_zps1ddb195c

New Custom Briggs Opposed Twin Exhaust? E82B593B-DC2D-40F4-991B-A424D54B45EE-62233-000012CF846ECBA5_zpsccd5f064

New Custom Briggs Opposed Twin Exhaust? 981E1D17-2C57-46BC-8B01-A900D5A465DE-65171-000013B0D06927FA_zps0ccff97c

New Custom Briggs Opposed Twin Exhaust? 026FC334-9C4A-49D1-A092-CA1ACDA42869-65171-000013B0E11B368E_zpsc218afc2

New Custom Briggs Opposed Twin Exhaust? 23EE3838-DC33-4094-B021-FC058B14F709-65171-000013B0EF5BFC75_zps17ab2e5b

New Custom Briggs Opposed Twin Exhaust? 328A1729-F047-4AC6-B013-D655E7FE3169-65171-000013B0F6020789_zps7a7dcf73
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PostSubject: Re: New Custom Briggs Opposed Twin Exhaust?   New Custom Briggs Opposed Twin Exhaust? Icon_minitimeJuly 5th 2013, 4:52 pm

TroyBilt Pony wrote:
I always here.of the racers running two into one exhausts but idk why lol

The reason is scavenging. The prior exhaust pulse (obviously from the other cylinder) creates a low pressure area (a vacuum) behind it, and helps draw out the next pulse. The better en engine breathes, the better it runs. BTW- This is NOT only true for oppys or twins. Any engine can benefit from multiple cylinder scavenging, but the system must be designed reasonably well.
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PostSubject: Re: New Custom Briggs Opposed Twin Exhaust?   New Custom Briggs Opposed Twin Exhaust? Icon_minitimeJuly 6th 2013, 4:52 am

I run dual into a single, but that was just because I was too lazy to run dual pipes. Sounds sweet though, it toned it quite a bit.


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PostSubject: Re: New Custom Briggs Opposed Twin Exhaust?   New Custom Briggs Opposed Twin Exhaust? Icon_minitimeJuly 24th 2013, 6:21 pm

I forgot to update this, Also I never can find this Exhaust topic, I keep looking under engine and shiz Razz


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PostSubject: Re: New Custom Briggs Opposed Twin Exhaust?   New Custom Briggs Opposed Twin Exhaust? Icon_minitimeJuly 24th 2013, 6:24 pm

Next step is to use Junkstars idea kinda, make a muffled set, and one straight one for shows. Since it's easy to swap out the 2" pipes now.
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PostSubject: Re: New Custom Briggs Opposed Twin Exhaust?   New Custom Briggs Opposed Twin Exhaust? Icon_minitimeJuly 24th 2013, 8:23 pm

Looking good, Thunder!
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PostSubject: Re: New Custom Briggs Opposed Twin Exhaust?   New Custom Briggs Opposed Twin Exhaust? Icon_minitimeJuly 24th 2013, 9:17 pm

Looks good gonna sound good
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PostSubject: Re: New Custom Briggs Opposed Twin Exhaust?   New Custom Briggs Opposed Twin Exhaust? Icon_minitime

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