noise level testing

[Mat Norris]

I have a 1600 xflow woth a 5" 4-1 side exit jobbie and want to test its noise for track use. Does anyone know where I can get it tested or buy/hire/borrow a noise level meter? Also what level should I expect - its quite loud I think! Thanks for input -

 

Mat

[AMMO]

Mat

 

If it's the same as my side exit silencer it is very loud!

 

I tested my 5" stainless Caterham silencer on a 1700 Crossflow last week. 0.5 metres at 45 degrees from exit:

 

3000 rpm 97 dB

4000 rpm 98 dB

5000 rpm 109 dB! Hurts your ears after a while.

 

Same silencer on a 2litre Zetec:

3000 rpm 92 dB

4000 rpm 98 dB

5000 rpm 104 dB

 

I also tested a proto-type silencer I'm working on in collaboration with another Blatchatter.

 

This gave 98 dB on the Zetec and 103 dB on the Crossflow, both at 5000 rpm. A reduction of 6 dB in both cases. A bit more work required to get it down to a more acceptable level. Seems that the old Crossie is a fair bit noisier than the Zetec.

 

I have a 6" Techcraft stainless re-packable silencer in the For Sale section if you're interested. I bought it to flowbench test to compare to the other silencers. It was not fitted to an engine as I want to sell it as a new item.

 

I doubt you would get your car through a noise test on a quiet trackday.

 

AMMO

[Stephen Furby]

I am also interested in knowing where I can get a car noise tested. What area are you in Mat? If you manage to hire something please let me know.

Cheers

[Roger King]

Don't know where you guys are in the country, but we'd be happy to noise test you as a free service at The 7 Workshop. Just give us a ring first. I would be very surprised if you can't get a Supersprint below 100db with the right system.

[AMMO]

I live in Woodbridge, Suffolk. Any locals wanting to noise test, feel free to contact me.

 

I'll be at a track day at Bentwaters this Saturday the 24th. I see from the participants list there are quite a few Caterhams booked in. I'll take my noise meter along even though there is no noise limit on the day. We'll have a white Easy-Up awning. If you want to be noise tested ask for Ammo.

 

AMMO

[fast_cat]

You can purchase a good meter from Maplins (start at about £50).

 

Demon Thieves also do a couple, one of which is more expensive.

 

Anyone doing Easytrack Airfield days (6th July is my next one), and need a noise test, come and find me...(Green, 1700 modified Xflow ...vloud)

 

Rob

[Gary Furst]

If they still exist near you, it is also possible to buy a sound level meter from Tandy at about £50.

 

With the freshly repacked 6" Techcraft silencer on my Xflow (about 185BHP), I was noise checked by the scrutineer at the Pembrey race at 102dB(A) at 5400rpm.

[mkinlen]

Roger,

 

I was pointed in your direction re getting a noise test sometime. I wanted to test it before I commit to the cadence day on 6th July at Bedford. In my posting in ChitChat re Zetec 2.0 noise levels, I was told you were in Hoddesden. Would be be possible for me to arrange to come over some time to test.

 

No problem if not.

Thanks, Mark.

[Roger King]

Mark,

 

No problem at all. Just give us a ring on 01992 421111 or 01992 470480 and we'll book you in.

 

Anyone else wanting to do the same is welcome - and we won't charge!

 

Just don't turn up unannounced because we may be otherwise engaged.