Stock Tailpipes I.D. ????

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 · 22 Jan 2013, 7:38 pm

#940334

Hey,

Just a quick question; can someone measure the inside diameter of their stock tailpipes; not including the baffling just the pipe itself.

Seriously thinking of modifying a stock muffler so that it's an absolute sleeper looking car; also so that it's closer to what was run by teams back in the day; like the salzburg kafers' or even Barry Ferguson in the '67 southern cross rally.

Thank you in advance

Cheers
Shaun

BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 · 23 Jan 2013, 10:23 am

#940410

anyone?

BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

modnrod Fahrvergnugen

978 posts · joined Mar 2011 · 23 Jan 2013, 1:27 pm

#940423

OK, since nobody else will have a go, here's what I THINK it is.......
1.3/8". I used 2 of them on a custom system for my son's 250 Virago (uhm, as you do.......). They may work well on VWs, but they're really bloody loud on a Virago! lol
If they are too small, there's always the option of 9" long hotdogs in any size you want, just cut off the tips.

And as for the sleeper standard looking muffler? Please tell me you will have tuned length pipes inside to make it flow damn near as good as a street 4-1?
I need pictures, coz I haven't cut mine up yet to start doing the same.

Go the Superstockers!!! 😂

1303Steve Scirocco Rare

8,650 posts · joined Aug 2002 · 23 Jan 2013, 2:16 pm

#940427

Hi

They are 35 mm OD, so maybe 33-34 mm ID

Steve

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 · 23 Jan 2013, 2:28 pm

#940430

Cheers guys;

this link shows a typical repro muffler; which will probably be the basis....
http://vwdcqinc.org.au/insideabug-insideamuffler

And this is what I want to achieve; so it's basically an OE muffler; with the variations being no cones on 1&3 and no holes in the pipes for 2&4

I can't imagine that this setup will be that tragic for a 1300; if considering that those salzburg bugs were pushing 120hp + with stock heater boxes and these mufflers!

👍

BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 · 23 Jan 2013, 2:33 pm

#940432

Might have "street" pipes with these TDE items; and then have "race" pipes with the bare pipes!

BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 · 23 Jan 2013, 5:02 pm

#940446

It will be loud with straight pipes

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 · 23 Jan 2013, 6:32 pm

#940465

hellbugged wrote:It will be loud with straight pipes

That's why I've called them "race" pipes... 😉

BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

1303Steve Scirocco Rare

8,650 posts · joined Aug 2002 · 23 Jan 2013, 10:03 pm

#940486

Hi

I ran no baffles on my 1300 twin port bug and also on my sons 1303 for a while, a fair bit louder but they do sound good.

Steve

modnrod Fahrvergnugen

978 posts · joined Mar 2011 · 24 Jan 2013, 6:17 am

#940497

A merged correct-length-for-specs 4-1 will net you probably 5HP on a 1600 over the stock system. A modified stock system will halve that difference.
Twin correctly-sized IDFs will net 10HP more than stock intake on a 1600. Again, a modified centrebranch and tweaked/ported Solex34 will halve that difference. Bigger motors the difference will be more pronounced though.

Those Salzburg cars prove that you can make anything run hard with a bit of thought, and still look mostly stock. 120HP out of a 1600 is not bad. If you're prepared to live with a bit less grunt for the sake of the "cool" surprise factor (and I am too!), it can be a challenge and good fun to optimise things as they are, rather than throwing parts at it. Each to their own, I prefer the stock look now, a bit more interesting to get the performance out of them.

Thanks for the "inner" photos.

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 · 24 Jan 2013, 7:50 am

#940509

modnrod wrote:If you're prepared to live with a bit less grunt for the sake of the "cool" surprise factor

With a 1300 there was no "grunt" so it's all about surprise. 🥷

BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

1303Steve Scirocco Rare

8,650 posts · joined Aug 2002 · 24 Jan 2013, 9:02 am

#940515

Hi

The Salzburg cars may had to use a stock exhaust to comply with regulations.

I agree more power to be had with a properly sized 4into1 header

Steve