Muffler Shop Special

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Viv
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Post by Viv » Fri Oct 05, 2007 11:00 am

Mike Everman wrote:Oh yeah, OK. Fuel modulator. Yep.
Yep, originally developed for Bruno's BCVP, just don't make the chamber size to big.

Viv
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Monsieur le commentaire

Mike Everman
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Post by Mike Everman » Sat Oct 06, 2007 8:22 am

It ran tonight! Nice and strong. I'll get thrust sometime this weekend. Seems to get some fueling instability at the very top end I'd like to chase down. Wish I'd made the fueling chamber removable, but...

All in all, great end to a crappy week!
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WOOT!

Post by Irvine.J » Sat Oct 06, 2007 8:47 am

GREAT JOB MIKE!!!
I can see us all underneath our wifes toyota prius' tonight ripping off mufflers! WOOT!

Sounds like she's running hot and hard! Raaaghghghg!
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Well done!

Post by Jutte » Sat Oct 06, 2007 9:24 am

Well done that is really great!

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Muffler Shop Special

Post by Mark » Sat Oct 06, 2007 10:09 am

Obviously it's one of them cherry bomb mufflers.
http://images.google.com/images?q=cherr ... ISO-8859-1
Last edited by Mark on Sat Oct 06, 2007 3:43 pm, edited 1 time in total.
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Post by Bruno Ogorelec » Sat Oct 06, 2007 11:48 am

Viv wrote:Nice to see a Collins collar out in the wild Mike:-) you could have used a simple tube from the inlet flare back to the CC chamber and increased the collar chamber size, welding the flare lip would have simplified things as this was one of the original goals.

Love the whole engine though, very nice

Viv
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Muffler shop special on youtube

Post by Mike Everman » Sun Oct 07, 2007 7:48 am

My 19 year old posted the test 1 on youtube tonight, taken on his cell. Fun stuff!


http://www.youtube.com/watch?v=iEB75OCy7WM
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Muffler shop special fuel tube and spark

Post by Mike Everman » Sun Oct 07, 2007 4:09 pm

so, Danny welded on the 1/4" brake line, flared end to the motor. Big bead, but works.
Also, I usually use a 1/8 NPT (tapered) tap to make threads for the CM-6 plug to go into. I went a bit deep, so the plug blew out on run 2. Still ran with a .4" hole in the side, though, ha. So to keep going, I wired the plug on, which works well, if you don't have a tap for threading in the plug.

for plug mounting, the muffler shop usually has weld-on threaded bosses used for sensors that will fit an automotive spark plug.
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mss 013.jpg
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Muffler shop spark plug

Post by Mark » Sun Oct 07, 2007 7:35 pm

What you might try for your spark plug is to get a 10mm nut with the 1 mm pitch and either get a flex ratchet or something like a curved stick with a socket to situate your nut where your spark plug can start to thread into it. Often, when you start to tighten it, the nut will lock on its own, and you don't have to hold it anymore. I could do it. ha
The Dynajet and Bailey jet both just have a nut on the inside of the jet which makes it nice for changing out a plug instead of welding it in there as some do.
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Post by Mike Everman » Mon Oct 08, 2007 6:57 am

Here's a rendering of the expanded tail option. I just have to characterize the straight version fully, then I'll have it changed to the expanded version. I updated the original plan at the start of this thread to show dimensions.
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mss, expando tail.jpg
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Jutte
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Wahoo

Post by Jutte » Mon Oct 08, 2007 7:42 am

And that is looking GOOD!
Just throw in a "U" bend in there and you have a
Muffler Special Lockwood...a Muffler Bent Special
a Special Bent Muffler ...er I want one!

GRIM
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Post by GRIM » Mon Oct 08, 2007 10:30 pm

If i might be so bold as to suggest an improvement , or maybe help someone who is going to attempt this design

looks like mig weld , correct me if im wrong ,

migging that thin walled brake pipe to thin steel is difficult , tig is ideal , but few muffler shops have tig

what i suggest is mig the brake pipe to a thick washer , 1/8" or more thick if possible , that way if you get any burn through, you can drill it out of the inside of the pipe , then weld the washer to the fuel inlet

there are of course other more elegant ways , but to keep it in the muffler shop i think this is practical

By the way really great design , theres going to be a whole lot of these made im sure

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Muffler

Post by hagent » Mon Oct 08, 2007 11:49 pm

It's part of the intake and fuel line, so it won't get too hot.

Just braze it.

Cheers,
Hagen Tannberg

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Post by randall » Tue Oct 09, 2007 12:18 am

So thats what its supposed to look like!! From what Ive seen here Im the only other to try this design..I got it welded up today and fired it in the drive way.. Not a good idea!!! Mike, take a look at the post "Newbie Here" over the next few days and Ill try to get some photos up.

Thanks for the plans Mike..

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