Bus 1972-74 muffler choice.

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VWMAN
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Bus 1972-74 muffler choice.

Post by VWMAN » Fri Jan 18, 2019 7:22 pm

In regards to engine health, primarily cylinder head temperatures, does anyone have an opinion about the aftermarket header pipe style into a muffler as compared to the stock factory muffler? I actually own two factory mufflers for this engine, a bus type with the short exhaust pipe that bolts to the right end of the muffler with 3 bolts and a 412 muffler that has the exit at an angle mid way down the muffler that a tailpipe/ dampener bolts too. My bus has the 72-74 heater boxes.

72Hardtop
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Re: Bus 1972-74 muffler choice.

Post by 72Hardtop » Fri Jan 18, 2019 10:46 pm

This a stock engine?
1972 Westy
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Bosch SVDA w/Pertronix module & flamethrower 40K coil (7* initial 28* total @3200+)
NGK B5ES @ .028
002 Trans
Hankook 185R14's

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satchmo
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Re: Bus 1972-74 muffler choice.

Post by satchmo » Fri Jan 18, 2019 10:58 pm

Give your engine a stock muffler to go with stock heater boxes/exhaust headers, and be happy.

Satchmo
By three methods we may learn wisdom:
First, by reflection, which is noblest;
second, by immitation, which is easiest;
and third, by experience, which is bitterest. -Confucius

VWMAN
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Re: Bus 1972-74 muffler choice.

Post by VWMAN » Sat Jan 19, 2019 12:57 pm

72Hardtop wrote:
Fri Jan 18, 2019 10:46 pm
This a stock engine?
Pretty much, it has a Porsche 914 cam in it. It is a 2.0 litre.

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Amskeptic
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Re: Bus 1972-74 muffler choice.

Post by Amskeptic » Mon Jan 21, 2019 3:17 pm

VWMAN wrote:
Fri Jan 18, 2019 7:22 pm
In regards to engine health, primarily cylinder head temperatures, does anyone have an opinion about the aftermarket header pipe style into a muffler as compared to the stock factory muffler? I actually own two factory mufflers for this engine, a bus type with the short exhaust pipe that bolts to the right end of the muffler with 3 bolts and a 412 muffler that has the exit at an angle mid way down the muffler that a tailpipe/ dampener bolts too. My bus has the 72-74 heater boxes.

If you have a 2.0, use the muffler with the right exit exhaust pipe. A little minutiae, the '72-'74 heater boxes and mufflers were actually divided up between:
a) smaller diameter 1700 heater boxes that worked with the left-exit damper equipped mufflers to Aug '73
b) slightly bigger 1800 heater boxes used with the right exit exhaust pipe muffler introduced with the 1974 1800 engine

Sell the damper-equipped muffler (found on all 1700 '72-'73 buses as well as the earlier 1700 411s) to a purist somewhere.
Colin
BobD - 1978 Bus . . . . . . . . . . . 111,155 miles
Chloe - 1970 bus . . . . . . . . . . . 206,820 miles
Naranja - 1977 Westfalia . . . . . 108,000 miles
Pluck - 1973 Squareback . . . . . . 55,570 miles
Alexus - 1991 Lexus LS400 . . . 78,885 miles

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asiab3
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Re: Bus 1972-74 muffler choice.

Post by asiab3 » Mon Jan 21, 2019 10:57 pm

Was "a)" closer the the Type 4 car setup that leave the muffler at an angle into a matching damper pipe?

Do you know if there are observable traits that allow humans to tell the different boxes apart?

Robbie
1969 bus, "Buddy."
119k miles with me.
296k miles on Earth.

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Amskeptic
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Re: Bus 1972-74 muffler choice.

Post by Amskeptic » Tue Jan 22, 2019 12:00 pm

asiab3 wrote:
Mon Jan 21, 2019 10:57 pm
Was "a)" closer the the Type 4 car setup that leave the muffler at an angle into a matching damper pipe?

Do you know if there are observable traits that allow humans to tell the different boxes apart?

Robbie
I'll answer your first question after you make it readable . . . :drunken:

Yes to the observable traits . . . :blackeye:

Colin :cherry:
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a) identical mufflers/dampers/*tailpipes between the 411 and the '72-'73 bus
* there might be a brochure "photoshop miss that deletes the left exit on the 411 wagons
* there might be a different tailpipe end on the 411s

b) early has smaller diameter pipes and thicker flange walls at the copper sealing rings (preferable!)
BobD - 1978 Bus . . . . . . . . . . . 111,155 miles
Chloe - 1970 bus . . . . . . . . . . . 206,820 miles
Naranja - 1977 Westfalia . . . . . 108,000 miles
Pluck - 1973 Squareback . . . . . . 55,570 miles
Alexus - 1991 Lexus LS400 . . . 78,885 miles

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airkooledchris
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Re: Bus 1972-74 muffler choice.

Post by airkooledchris » Mon Feb 04, 2019 8:25 pm

When Jake did his muffler project, and eventually decided against offering anything themselves, they found the collector style mufflers to be the best when it came to HP and CHT's. Only some extremely expensive variations of the Tangerine racing system were found to have any improvements over it.

just FYI. I knew all that and still ended up picking the stainless one from Vintage Speed because it was pretty and I didn't want to have to replace it again in a few years time. Those EMPI stainless steel extractor/muffler setups are probably the way id go if I were going to do it again today. They don't 'look' right, but they work really well. The non-stainless versions will fail within a few years (the muffler part anyway, the collector part will be fine.)
1979 California Transporter

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Amskeptic
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Re: Bus 1972-74 muffler choice.

Post by Amskeptic » Wed Feb 06, 2019 6:07 pm

airkooledchris wrote:
Mon Feb 04, 2019 8:25 pm
I ended up picking the stainless one from Vintage Speed because it was pretty
Fotos or you're phake news.
Colin :blackeye:
BobD - 1978 Bus . . . . . . . . . . . 111,155 miles
Chloe - 1970 bus . . . . . . . . . . . 206,820 miles
Naranja - 1977 Westfalia . . . . . 108,000 miles
Pluck - 1973 Squareback . . . . . . 55,570 miles
Alexus - 1991 Lexus LS400 . . . 78,885 miles

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