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 DB Killers wanted

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WAKEY
Tanabuso
Tanabuso


Posts : 70
Join date : 2015-04-17
Age : 59

PostSubject: DB Killers wanted   Mon Jul 06, 2015 6:48 pm

G, Day fellers, would any one happen to have a set of DB Killers for a set of LAVIZZARI slip on meggies the ones on my picture that they don't need that i could buy from them. i've tried getting in contact with LAVIZZARI with no luck buy EMAIL. i love the sound as it is but my tinittis has never been so loud since i've had my GRiSO and i was thinking if i put the DBKs in it may not pop so much on low down back off. any help much appreciated.

Wakey.
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http://sw57@bigpond.com
plantboy
Don Abbondio
Don Abbondio


Posts : 200
Join date : 2014-05-31
Age : 68

PostSubject: Re: DB Killers wanted   Tue Jul 07, 2015 12:16 am

I'm also a tinnitus sufferer, and I hope you are using good ear plugs mate.  Sorry I can't help with the db killers.
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Grisodude
Tiradritto
Tiradritto


Posts : 312
Join date : 2013-07-02
Age : 55

PostSubject: Re: DB Killers wanted   Tue Jul 07, 2015 3:03 am

Hi Wakey
Not sure if these guys can help but worth a look.
I bought a DB killer for my pipe and the service was 100%.
They may have some thing you can use.

[You must be registered and logged in to see this link.]
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Lenz9753
Tanabuso
Tanabuso


Posts : 87
Join date : 2015-06-16

PostSubject: Re: DB Killers wanted   Tue Jul 07, 2015 6:01 am

WAKEY wrote:
G, Day fellers, would any one happen to have a set of DB Killers for a set of LAVIZZARI slip on meggies the ones on my picture that they don't need that i could buy from them. i've tried  getting in contact with LAVIZZARI with no luck buy EMAIL. i love the sound as it is but my tinittis has never been so loud since i've had my GRiSO and i was thinking if i put the DBKs in it may not pop so much on low down  back off. any help much appreciated.

Wakey.

There's maybe a few possible sources for exhaust popping on roll off : unburnt fuel / overly rich mixture, oxygen entry into the exhaust via a leak or by air being sucked back into the mufflers / gas flow phasing (low probability).

If you like the way the bike is currently, maybe it's worth investigating any mixture or system leakage issues before the dB killers .... ?
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voulga77
Don Abbondio
Don Abbondio


Posts : 46
Join date : 2014-08-26

PostSubject: Re: DB Killers wanted   Tue Jul 07, 2015 10:19 am

Why don't you have them made by somebody? It's not nuclear science.
Use inox tube 25mm internal diameter and 120mm long for each outlet.

I have this exhaust on my breva: HPE Dual which is a dual outlet as yours.
The dbkillers are as described above.

Make those dbkiller and use them, you will notice the preformance improvement.
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WAKEY
Tanabuso
Tanabuso


Posts : 70
Join date : 2015-04-17
Age : 59

PostSubject: Re: DB Killers wanted   Tue Jul 07, 2015 2:36 pm

Thanks for Replies fellers.
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Lenz9753
Tanabuso
Tanabuso


Posts : 87
Join date : 2015-06-16

PostSubject: Re: DB Killers wanted   Thu Jul 09, 2015 4:17 am

voulga77 wrote:
Why don't you have them made by somebody? It's not nuclear science.
Use inox tube 25mm internal diameter and 120mm long for each outlet.

I have this exhaust on my breva: HPE Dual which is a dual outlet as yours.
The dbkillers are as described above.

Make those dbkiller and use them, you will notice the preformance improvement.

Wow you've got those dB killers down tight.

My response to the Termi that was on my 2010 GRiSO 8V when I bought it at 22000km was to extract the cat, flair the leading edge of the baffle tube to meet the wall of the muffler, repack the sound-deadening fibreglass wool along with additional woven fiberglass tape and to reduce the muffler outlet diameter from 58mm down to 51mm to match the collector.

The "dB killer" I've installed at 51mm inside diameter maybe could be reduced a little further due to the exhaust gas cooling in transit. I would have liked to have been able make a more informed choice on the outlet diameter but was unable to find any info on the exhaust valve / seat diameter of the GRiSO 8V.
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voulga77
Don Abbondio
Don Abbondio


Posts : 46
Join date : 2014-08-26

PostSubject: Re: DB Killers wanted   Thu Jul 09, 2015 4:30 am

Usually dbkillers for single outlet are 30 to 35mm inside diameter.
This restriction is wanted for the engine to run better.

Termi dbkillers are usually pretty long. Ask from somebody with a Termi to measure length and diameter.
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Pete Roper
GRiSO
GRiSO


Posts : 3783
Join date : 2013-05-29
Age : 59

PostSubject: Re: DB Killers wanted   Thu Jul 09, 2015 4:56 am

The 1100 and the 1200 are as different as chalk and cheese, also for comparison purposes I tried the Lavizzari system on my 1200 and it was horrible. OK, so back then I wasn't able to try alternative maps but to me it definitely appeared to be more a harmonic issue than a mapping issue.

The Lavizzari is a twin pipe, 'Shotgun' system and with the killers in was very nice on the 1100. Without them in it was a deafening, vibratory, pig! On the 1200 it was awful, with or without killers, in every way imagineable!

Pete
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PostSubject: Re: DB Killers wanted   Today at 4:46 am

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