Dual exhaust tips for a 2.0 /4 ?, ..like on a GT or -6 Options

[Literati914]

I Love my Traid!

I also modified a FG Rear Valance to "Hide' the muffler.

Also noticeable difference in performance .
Sounds Great too !! (IMG:style_emoticons/default/aktion035.gif)

I like what you did with that valance, I have something similar in mind.

[Dave_Darling]

But Dave, I'm wondering if that could have been because the internals were all just removed on yours...

I don't know; that was why I specified that I bought it at a swap meet. It was already modified and I don't know what they actually did to it.

--DD

[Literati914]

But Dave, I'm wondering if that could have been because the internals were all just removed on yours...

I don't know; that was why I specified that I bought it at a swap meet. It was already modified and I don't know what they actually did to it.

--DD

Yes, I understood. Thanks.

[Literati914]

6 and 4 heat exchanger flanges are completely dif.

Does anyone have a diagram/drawing depicting the dimensions of the early /6 muffler flange, HE's (up to '74 are apparently the same)?
I have found a diagram showing the different dimensions between 1.7,1.8 & 2.0 4 cylinder HE's.

..The muffler for a 4 you decide upon must be compatible with the heat exchangers on your car. It's all about the heat exchangers.

So, in your opinion.. would you say that as long as the engine's displacements are similar (the 2056 /4 and a stock early /6 both being 2.0L essentially), that whether they're a /4 or /6, makes no difference, as long as the HE's line up to the muffler of choice?

So, for instance my options may be to use a dual tipped sport muffler meant for a 1.7/1.8 (if they exist) on my 2.0L based 2056 IF using 1.7/1.8 HE's on my 2L? ...or using a dual tipped sport muffler for an early /6 as long as my heat exchanger flanges were altered to match up to that muffler?

[troth]

I’ll post pics and dimensions after work today. Looks good, but more importantly sounds great. (IMG:style_emoticons/default/wub.gif)

Here's an old vid of this muffler Chris Foley did for me. With the valves properly adjusted, it sounds even better. I think those are 1.5" OD pipes spaced by 11 or 11.5" center to center (can't remember exactly).

Damn, video's not working. Trying to figure it out.

 Sport_Muffler.wmv ( 3.83mb ) Number of downloads: 69


Maybe now it’s good? (IMG:style_emoticons/default/confused24.gif)

[troth]

And here’s a pic with the valence.

[troth]

One more.

[ChrisFoley]

So, in your opinion.. would you say that as long as the engine's displacements are similar (the 2056 /4 and a stock early /6 both being 2.0L essentially), that whether they're a /4 or /6, makes no difference, as long as the HE's line up to the muffler of choice?

NO, absoulutely not!
The two engines are so totally different that there is no comparison between the same muffler on either a six versus a four.
The Triad may well increase the horsepower on a six but I highly doubt it has any beneficial effect on a four. Same with any muffler which claims power gains on a six, but with different flanges fits a four. It is almost certain to hurt the performance on a four if the two pipes on each side are collected together into a single inlet to the muffler on each side of the engine.

[Dion]

Dougster here’s my 2056 with a muffler made
by TT turbothomas in the UK. Wasn’t cheap.
I was actually his prototype project. Not sure if he continued the line
with respect to demand. It was loud, but i loved the look. It was 304 stainless.
Link: http://www.ttexhausts.com/about-us/

I’ve sold both engine and muffler on now to jmitro here on World.

Good luck.

[mepstein]

I purchased a prototype SS 2 in, 2 out from Ben years ago. I switched the build to a 6 so it was sold. I think Zach/Vacca Rabbi has it now. It sure looked good.

[Literati914]

Thanks everyone for weighing in.. think I'll just try and get a stock 2.0 dansk 'banana' muffler and do the typical early 911 muffler to sport muffler conversion procedure. It's more the simple GT look I'm after.

In regards to what I asked earlier... I'm accepting that a /6 muffler on a /4 is no good, even though the displacement is the same (though I have no idea what magic inside would make that so), BUT what about a 1.7/1.8 muffler on a 2.0 if using the appropriate HE's ? Any obvious drawbacks with doing that? Just trying to get options straight. thanks.

[mepstein]

Thanks everyone for weighing in.. think I'll just try and get a stock 2.0 dansk 'banana' muffler and do the typical early 911 muffler to sport muffler conversion procedure. It's more the simple GT look I'm after.

In regards to what I asked earlier... I'm accepting that a /6 muffler on a /4 is no good, even though the displacement is the same (though I have no idea what magic inside would make that so), BUT what about a 1.7/1.8 muffler on a 2.0 if using the appropriate HE's ? Any obvious drawbacks with doing that? Just trying to get options straight. thanks.

Yo just have to match he's, muffler and hanger. Or buy Ben's muffler bracket for a GT look.

[Larmo63]

Just put a six in it. (IMG:style_emoticons/default/confused24.gif)

[Dave_Darling]

(though I have no idea what magic inside would make that so)

The Six has three cylinders per side, with evenly spaced firing. The exhaust pulses arrive in a nice steady train, so if you combine those three into a single pipe a given distance from the exhaust port they will flow steadily.

The four-cylinder engine has two cylinders on each side, with very uneven firing. You get both of those cylinders firing, then nothing for half an engine cycle, then both firing again. Combine those two into a single pipe, and you're going to have very uneven flow. Note that the stock -4 heat exchangers do not combine the two pipes at all; they remain separate all the way into the muffler!

For the Six muffler, you want to take the single pipe for each side and combine it at some point with the single pipe from the other side. For the Four mufflers, you would more likely be combining all four pipes at the same point--or if there is room, combine cylinders across from each other then combine those into a single flow.

BUT what about a 1.7/1.8 muffler on a 2.0 if using the appropriate HE's ? Any obvious drawbacks with doing that?

That works fine. You need to make sure the HEs, muffler, and muffler hanger all match. But they bolt up to any of the 914-4 motors and work about the same. Very likely better than any of the 75-76 exhaust; probably a very little less good on a 2.0 than the 73-74 2.0 exhaust.

--DD

[Literati914]

Just put a six in it. (IMG:style_emoticons/default/confused24.gif)

I've been there and done that. Wish I could again, unfortunately the /6's are too expensive for me at the moment.

[Literati914]

BUT what about a 1.7/1.8 muffler on a 2.0 if using the appropriate HE's ? Any obvious drawbacks with doing that?

That works fine. You need to make sure the HEs, muffler, and muffler hanger all match. But they bolt up to any of the 914-4 motors and work about the same. Very likely better than any of the 75-76 exhaust; probably a very little less good on a 2.0 than the 73-74 2.0 exhaust.

--DD

I got it, and thanks for the details. I figured exhaust pulses played into it IF ANYTHING. I've just tended in the past, to be skeptical about how much the insides of these (dansk for '68-'74) mufflers actually differ .. I had guessed they were basically the same internally and therefore unlikely to differ in respect to their effect on engine performance. Of course the flange spacings would be different across there different engines. But without opening each one up and seeing, there's no way of knowing for sure the difference internally. Maybe I'm not giving dansk enough credit in their tuning department though, and perhaps a muffler's not just a muffler after all (IMG:style_emoticons/default/biggrin.gif) . So I'll stick with the conventional wisdom. thanks again.

[majkos1]

I Love my Traid!

I also modified a FG Rear Valance to "Hide' the muffler.

Also noticeable difference in performance .
Sounds Great too !! (IMG:style_emoticons/default/aktion035.gif)

I like what you did with that valance, I have something similar in mind.

Thanks!
It was my first time working with FG.
It started out getting Hole sawed,
Notch out between two holes,
Put in screen for reinforcement....
Trim around exhaust .

[GeorgeRud]

You could also tap off the passenger side of the muffler to make a ‘bull horn’ style muffler. I had one on a previous 911and it wasn’t too loud, though certainly more than stock. You’ll get tired of the dual outlet sport muffler in short order if you’re driving on the street.

[mepstein]

You could also tap off the passenger side of the muffler to make a ‘bull horn’ style muffler. I had one on a previous 911and it wasn’t too loud, though certainly more than stock. You’ll get tired of the dual outlet sport muffler in short order if you’re driving on the street.

I have a rally style muffler getting fabricated. Twin tips out the back and one on the side. Caps for the ends so I can adjust the sound level as I wish.
I have also seen non-functional twin tips welded on a stock 1 out muffler just to have the look without the sound.

[eric9144]

http://www.914world.com/bbs2/index.php?showtopic=201688

^Thread about 2.0 "GT" muffler.

Yep, I'd already read that one before posting. I'm not sure if the original poster of that thread read the german ebay add clearly enough to tell if it was intended for the /4 2L or the /6 2L ... He may have just read "2.0" and assumed it was for the /4. He did not post a link to the add or a model number. As I mentioned earlier I've found mention of these for the 1.7 & 1.8. Either way, I can not located that particular muffler now, or a german Ebay add for it now, unfortunately.

That post was me and I kick myself for being a CSOB and not pulling the trigger on those--they were for the 2.0 (confirmed via EBay seller) and when I finally went back to buy they were gone and I haven't been able to find them since (IMG:style_emoticons/default/dry.gif)