Muffler Shop Special

[Viv]

Oh yeah, OK. Fuel modulator. Yep.

Yep, originally developed for Bruno's BCVP, just don't make the chamber size to big.

Viv

[Mike Everman]

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!

[Irvine.J]

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!

[Jutte]

Well done that is really great!

[Mark]

Obviously it's one of them cherry bomb mufflers.
http://images.google.com/images?q=cherr ... ISO-8859-1

[Bruno Ogorelec]

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

Ha-ha-ha... I just knew you'd notice. :o)

[Mike Everman]

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


http://www.youtube.com/watch?v=iEB75OCy7WM

[Mike Everman]

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.

[Mark]

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.
http://www.gearwrench.com/images/items/ ... /81204.jpg

[Mike Everman]

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.

[Jutte]

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]

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

[hagent]

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

Just braze it.

Cheers,

[randall]

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..