Wrapping Vintage Speed Exhaust ?

[Daddio]

I'm experiencing the dreaded VS exhaust drone. Just got back from a 200 mile plus trip, at a fairly sustained speed of 60mph or 3700 rpm in my 71 Westie, the noise is just too much.
I'm running a new build 1776, CB stock heads and valves with heavy springs.
It's got the CB cheater cam and stock 34/30 Solex carb and stock air cleaner, stock heater box's and the Vintage Speed Bay Window Sport Exhaust. Great power and torque but highway travel is annoying. Has anyone tried wrapping the VS muffler to help eliminate this problem, or any other ideas?

[richparker]

Wow, I think my VS sport sounds great in my ‘71 westy at those rpms and I have a CB speced 2275cc. I got a db app for my phone and I’m at 87 db at those rpms and I think it sounds great. Even my wife thinks it’s nice, way better then a merged to quite pack.

Maybe a stock exhaust is in your future, because you’re never gonna find a performance exhaust quieter then the VS sport. I’ve been down that road before. If you do find one please post what it is and the db levels it produces. Because at 60 mph my work truck w/ stock exhaust, my personal truck w/stock and bus w/VS sport exhaust all produce 87 db in the cab.

By heavy springs do you mean dual springs?

As a side note what was your MPG with that 1776 with cheater cam and pict34?
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’71 Westy build
Adventure thread
’65 Deluxe Build

[richparker]

Since you have basically a stock engine, maybe this will better suit your sound needs. Although if it were me, I’d add a set of IDF40s and enjoy the power and gas mileage.

https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0
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’71 Westy build
Adventure thread
’65 Deluxe Build

[mikedjames]

I use a single quiet pack and managed to get quite a lot of sound deadening by using modern 30mm neoprene foam insulation above the engine bay, and inside the tailgate and under the rear seat. It took the inside of the bus from loud to being able to hear conversations and the stereo.
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Ancient vehicles and vessels

1974 VW T2 : Devon Eurovette camper with 1641 DP T1 engine, Progressive carb, full flow oil cooler, EDIS crank timed ignition.
Engine 1: 40k miles (rocker shaft clip fell off), Engine 2: 30k miles (rebuild, dropped valve). Engine 3: a JK Preservation Parts "new" engine, aluminium case: 26k miles: new top end.
Gearbox rebuild 2021 by Bears.

1979 Westerly GK24 24 foot racer/cruiser yacht Forethought of Gosport.
1973 wooden Pacer sailing dinghy

[richparker]

[Daddio]

Rich,
I checked my build sheet and it only specified HD valve springs I'm pretty sure there not the doubles.
I hear very little exhaust note just a constant low pitch resonance.
I've put all new sound deadening material in the engine compartment and inside the bus.
On my old engine I was running a BugPack dual quite pack, nothing quite about it but it had the VW exhaust sound, now it sound like an old tank style gas water heater heating up.
Outside the bus the muffler is very quite at idle and city driving is not bad its just the highway speeds the sound is annoying.
I got around 20 mpg and the bus ran great.
Thanks for your help.

[richparker]

[aeromech]

Take a look at the direction your exhaust outlet is pointed. It should point aft roughly parallel with the ground. I had one from A1 Muffler that pointed down and created the sound you’re having. Solution was to cut and weld into the aft direction
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[richparker]

It does not face down.

It produces 87db. What db does you’re exhaust produce at 60 mph, Aeromech?
_________________
__________
’71 Westy build
Adventure thread
’65 Deluxe Build

[aeromech]

This caused excessive reverberation

_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[aeromech]

It produces 87db. What db does you’re exhaust produce at 60 mph, Aeromech?

It's a customers bus from years ago. The point is that once installed, this $1000 exhaust created a lot of the same noise that the OP here is reporting. Just trying to help solve his problem.
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[richparker]

I was asking about the beetle exhaust on your bus. You say it’s the best and the quietest. I think it’s nice, but it’s definitely not a performance exhaust. Please tell us some details. What’s the db at 3500 rpm, whats the Dyno numbers. Please tell us something other then “it just sounds nice.” Because in my opinion mine sounds nice too.
_________________
__________
’71 Westy build
Adventure thread
’65 Deluxe Build

[aeromech]

I like my exhaust but it has nothing to do with this thread
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[VWsArent4Hippies]

[aeromech]

[VWsArent4Hippies]

[Daddio]

Mine points straight back, I thought it might be too close to the bumper and it does not stick out past the bumper.
I'm going to do a db test tomorrow afternoon I'll post the results tomorrow evening.
Thanks

[Daddio]

[richparker]

[aeromech]

Thanks for the picture OP. Hippie, kiss my ass. I was trying to help from my personal experience. You should try it sometime
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound