Noisy Dump Valve

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Noisy Dump Valve

Postby Dom » Fri 08.09.2017, 12:09

Afternoon, All.

My SE has a "whoosh" style dump valve. As I'm not 23 anymore, I wondered if there was a way of making it quieter. I have attached a photo as the valve has a large outlet at the base. Could I add a pipe and a small filter? I can't direct things into the dustbin air filter as there's a K&N.

Many Thanks,

Dom
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Re: Noisy Dump Valve

Postby theelanman » Fri 08.09.2017, 12:30

the LGM version with the greddy dump valve was plumbed into the trash can/air filter.....
:-D
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Re: Noisy Dump Valve

Postby Dom » Fri 08.09.2017, 13:07

theelanman wrote:the LGM version with the greddy dump valve was plumbed into the trash can/air filter.....
:-D


Oh, bother. Anything else I can do, apart from retro fit the dustbin, which I don't have?
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Re: Noisy Dump Valve

Postby theelanman » Fri 08.09.2017, 13:16

they were on the after sales list.........check there if you want to put back to standard
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Re: Noisy Dump Valve

Postby HJ2 » Fri 08.09.2017, 13:20

That, or buy another dump valve with a silencer in stead of a trumpet :D
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Re: Noisy Dump Valve

Postby theelanman » Fri 08.09.2017, 13:37

just checked.......the trash cans aint listed no more...... :(
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Re: Noisy Dump Valve

Postby HJ2 » Fri 08.09.2017, 14:01

If you want it, I have it 8)
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Re: Noisy Dump Valve

Postby rip » Fri 08.09.2017, 14:11

I can't see the outlet very well in that picture.
You don't need to plumb it back into the trash can in order to shut it up. I didn't.
I have the Greddy one which comes with 2 attachments: a noisy trumpet type & one onto which a 1" hose fits. This is about the right length to plumb into the trash can, but instead of doing this I directed it down through the engine bay. This made it significantly quieter & I shut it up further by adding a small air filter to the end. I think you can hear it if you listen really hard but I don't notice it at all.
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Re: Noisy Dump Valve

Postby Dom » Fri 08.09.2017, 14:17

rip wrote:I can't see the outlet very well in that picture.
You don't need to plumb it back into the trash can in order to shut it up. I didn't.
I have the Greddy one which comes with 2 attachments: a noisy trumpet type & one onto which a 1" hose fits. This is about the right length to plumb into the trash can, but instead of doing this I directed it down through the engine bay. This made it significantly quieter & I shut it up further by adding a small air filter to the end. I think you can hear it if you listen really hard but I don't notice it at all.


Ah, now we're talking. The valve has a large bore outlet that points downwards and a small pipe on the top, to which nothing is attached.
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Re: Noisy Dump Valve

Postby Dom » Fri 08.09.2017, 14:27

The valve is by HKS. Here are a couple more photos:
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Re: Noisy Dump Valve

Postby rip » Fri 08.09.2017, 18:51

Has it got any pipe on it at all?
It should have one which connects to the other side of the throttle valve plate. A pressure difference across the plate (because the throttle is closed) should open the dump valve. I don't understand how else it can work properly.
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Re: Noisy Dump Valve

Postby Dom » Fri 08.09.2017, 21:10

The blue pipe in my first photo goes from the underside of the valve to the left side of the plenum.
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Re: Noisy Dump Valve

Postby Dom » Mon 25.09.2017, 15:31

Pipe and air filter fitted. I can now turn my (tweed) cap the correct way around and listen to Radio 4. Very civilised.
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Re: Noisy Dump Valve

Postby simonbuk » Sat 30.09.2017, 11:45

These dump valves are hard to find aren't they ? Seem to remember a thread a while ago saying they weren't made anymore ?
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Re: Noisy Dump Valve

Postby Dom » Sat 30.09.2017, 23:26

simonbuk wrote:These dump valves are hard to find aren't they ? Seem to remember a thread a while ago saying they weren't made anymore ?


It was on the car when I bought it. I'm not sure it's necessary, but it is what it is.
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Re: Noisy Dump Valve

Postby lotusflasherman » Sun 01.10.2017, 00:17

simonbuk wrote:These dump valves are hard to find aren't they ? Seem to remember a thread a while ago saying they weren't made anymore ?


Really ??? www.ebay.co.uk - RECIRCULATING-DUMP-VALVE-
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Re: Noisy Dump Valve

Postby tigerdog » Sun 05.11.2017, 17:57

Smaug wore a K&N for many years. Here's how I eliminated the whoosh:
Image
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