[Tom Hand]

We have two VOE II mufflers ready to complete. They will soon be welded together so we can hear them. I will post an image as soon as I can get it together.

Tom Hand

[This message was edited by Tom Hand on March 06, 2004 at 08:21 AM.]

[This message was edited by Tom Hand on March 06, 2004 at 08:21 AM.]

[Tom Hand]

This is the last one. It shows the MityVac I use to actuate the vacuum diaphragm that pulls them open.

[Michael Farich]

Tom,

I'd suspect the market for these would be for those who want better WOT efficiency than a 17749 Dynomax hemi super turbo, but wanted quieter cruise than a Goerlick XLerator.

I wonder if even the WOT mode of the VOE could rival the straight-thru efficiency of one like an XLerator.

Mike

[Tom Hand]

Hi Forrest,
I have the original patents and have been working with the original designer. He has been tremendously helpful.

The OEM ones were 5" by 9.25" by about 19" and I am working hard to get a company to send these sized parts to build two of them for trials. The ones in the photos are 5" by 11" by 18" with 2.5" inlets and outlets. OEMS ones were 2" in and 2.25" out.

They are normally closed and when you pull a vacuum (via the Tiger Button under the dash), they open (like the originals did).

The goal is to get two sets together and the sound checked and then turn the methods of making them over to someone that does this stuff for a living.

These are made with pretty much off the shelf parts with help from about three muffler companies and several suppliers including Chris here at PY. He found the vacuum diaphragms and donated them to the effort. We would like to make non-original versions that could be adapted to normal cars.

I can tell you what I had to do so far to make these. Please email me if you are interested. thand@kc.rr.com.

Tom Hand

[Tom Hand]

Darrell, I seriously doubt it since we have to find a real manufacturer to produce them and lots of testing is still needed. It is tough to get in when real muffler guys are very very busy and this is such a limited interest item. However, things are more likely now than they were one year ago .

Tom Hand

[khkiley1]

OK,

Thanks for the info, I didn't know how they worked. I thought it was an automatic deal that dumped the mufflers when it was floored.

They look like a real nice setup.

K

[Tom Hand]

Here is the close up.

Tom Hand

[Tom Hand]

We have two VOE II mufflers ready to complete. They will soon be welded together so we can hear them. I will post an image as soon as I can get it together.

Tom Hand

[This message was edited by Tom Hand on March 06, 2004 at 08:21 AM.]

[This message was edited by Tom Hand on March 06, 2004 at 08:21 AM.]

[Tom Hand]

Here is another shot.

Tom Hand

[Ccass]

'Sounds' like the old days! I'm curious to hear them.

[Forrest]

this is excellant!, I was going to try to fabricate the mufflers in my shop, you definitly beat me to it!, I have a `70 gto conver. 4 speed with the VOE, I will need the mufflers when i get into the restoration of the project, any idea when you might have these done? Price??? this is great, you guys are doing it for me!??

[Tom Hand]

80_455,
These are very similar and in fact, based on the OEM VOE mufflers from 1969-70 GTOs. The vacuum diaphragm is hooked to a valve inside that opens or closes off passages in the muffler. With full vacuuum, the valve opens to allow all of the exhaust to bypass the sound absorbing part of the muffler and exit right out the tailpipe. The internal passages are now wrapped in sound absorbing glass fiber inside the shell. In closed mode, the exhaust goes through two more passages and "is supposed" to be quieter (I made some changes in internal sizes). Look at the photos and you can see what I mean.

Tom Hand

[Darrell]

Ohh well I will just get the cut out X system then.

ET 13.2 and spinning like a mother

[Darrell]

sounds cool Tom. Is there any chance they will be for sale within the next three months?

ET 13.2 and spinning like a mother

[Tom Hand]

The VOE II mufflers are completed and we may get to hear them on a Pontiac engine shortly. If all goes well, we will use similar methods (that we used to record the Silent Power CD) to record the VOE II mufflers in the open and in the closed mode. I will provide an update as soon as we have any information to share.
Tom Hand

[Tom Hand]

We got them done and heard them finally. They sound really good and smooth when closed, loud and rumbly and powerful when open. There is a drastic difference in open and closed. We plan to record them this Saturday.

Here are the numbers, readings on the A scale from 10 feet using a 470 cu. in. Pontiac with 3" front pipes and 2.5" mandrel bent Mustang tailpipes from Dynomax.

1000 rpm, closed 76 dBA, open 83 dBA
3000 rpm, closed 89 dBA, open 97 dBA

More to follow.
Tom

[Held for Ransom]

Very nice Tom.

[EricL]

what does the vacuum do for it?

______________________________
1980 Special Edition Trans Am

1975 2 bolt 455, 6X-8 heads, summit 2802 cam, stock intake, holley 600cfm vacume secondaries and modified adapter.
TH350 trans and converter out of a 78 TA, stock 10 bolt with 2.41 gears
pypes 2.5" exhaust

[Tom Hand]

Another Shot

[Tom Hand]

Well, we get to wait another week. My engine was not available so no sound checks yet today Sunday.
Will provide information as it is available.
Tom Hand