Author Topic: '98 V11EV (and similar) RESONATOR (The Tumor)  (Read 181 times)

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'98 V11EV (and similar) RESONATOR (The Tumor)
« on: May 23, 2020, 07:21:40 PM »
So I got my tumor through eBay today. Appears to be in excellent condition.

Looking at the unit it appears the shell is made in two halves from identical stampings.

Only difference is one side has a Moto Guzzi part number stamped into it.

It looks like this unit could be mounted with either side up.

Is there a TOP and BOTTOM to this unit or does it install either way?

Thanks.
'98 MG V11 EV
'96 URAL SPORTSMAN
'77 MG 850T3 FB

Offline boxer.randy

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Re: '98 V11EV (and similar) RESONATOR (The Tumor)
« Reply #1 on: May 23, 2020, 08:18:10 PM »
When in doubt, writing is on top. I just made that up. Don’t think there is a difference. If the EV is new to you, then check the air box cover. Two years ago , I decided to drill 1”” holes so more air could enter. The sound would make a Harley owner with straight pipes cry uncle. I had to replasticize the lid, it was that loud thru my earplugs.
94 R100R Mystic , 92 K75S, 98 EV, 17 Stelvio NTX

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Re: '98 V11EV (and similar) RESONATOR (The Tumor)
« Reply #2 on: May 23, 2020, 08:21:26 PM »
When in doubt, writing is on top. I just made that up. Don’t think there is a difference. If the EV is new to you, then check the air box cover. Two years ago , I decided to drill 1”” holes so more air could enter. The sound would make a Harley owner with straight pipes cry uncle. I had to replasticize the lid, it was that loud thru my earplugs.
EV not new to me. Airbox is stock original.
Noise is exhaust note.
'98 MG V11 EV
'96 URAL SPORTSMAN
'77 MG 850T3 FB

Offline guzzisteve

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Re: '98 V11EV (and similar) RESONATOR (The Tumor)
« Reply #3 on: May 23, 2020, 11:19:00 PM »
Put the dirty side down. Isn't one side dirtier? That would be road grime unless it's new.

My airbox has 2    2 1/2 inch holes in it, intake roar is almost the same as exhaust. It gets loud in the airbox, pods or K&N's are quieter.
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Re: '98 V11EV (and similar) RESONATOR (The Tumor)
« Reply #3 on: May 23, 2020, 11:19:00 PM »

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Re: '98 V11EV (and similar) RESONATOR (The Tumor)
« Reply #4 on: Today at 02:57:57 AM »
Put the dirty side down. Isn't one side dirtier? That would be road grime unless it's new.

My airbox has 2    2 1/2 inch holes in it, intake roar is almost the same as exhaust. It gets loud in the airbox, pods or K&N's are quieter.
Did the forensics. Unit probably swapped for H Pipe early on. Both sides look equally clean. No scratching more obvious on one side than the other.

On a later unit with O2 sensor installed the O2 sensor is on the side opposite the stamped Moto Guzzi part number. Significant?
'98 MG V11 EV
'96 URAL SPORTSMAN
'77 MG 850T3 FB

Online Zoom Zoom

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Re: '98 V11EV (and similar) RESONATOR (The Tumor)
« Reply #5 on: Today at 04:50:26 AM »
If you look at it from the side, if there is a slight angle between the inlet and outlet pipe, the outlet should angle slightly up. It has been a while since I looked at one.

If the in and our are straight with each other then, like others already said, I don't think it matters.

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and the flying motor singing.
Samuel C. Lancaster 1921

Offline JoeB

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Re: '98 V11EV (and similar) RESONATOR (The Tumor)
« Reply #6 on: Today at 06:24:16 AM »
Looked at the one I have and Zoom Zoom is correct that there is a slight upward angle on the exit pipes.
That puts the engraving on the unit facing down on mine.
Also the front pipes have slits that fit over the header pipes while your mufflers will have slits that fit over the exit pipes. Hope that makes sense.
« Last Edit: Today at 06:37:44 AM by JoeB »
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Re: '98 V11EV (and similar) RESONATOR (The Tumor)
« Reply #7 on: Today at 06:28:04 AM »
Sounds like the info I needed.
Thanks
'98 MG V11 EV
'96 URAL SPORTSMAN
'77 MG 850T3 FB

Online PeteS

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Re: '98 V11EV (and similar) RESONATOR (The Tumor)
« Reply #8 on: Today at 07:22:58 AM »
Just curious, many of us who bought these bikes new replaced the canister with an H pipe mostly to save weight which is significant. Why did you opt for the canister?

Pete

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Re: '98 V11EV (and similar) RESONATOR (The Tumor)
« Reply #9 on: Today at 07:35:21 AM »
Thought everyone dumped the canister to clear the transmission drain plug.
I am told the canister makes the exhaust much quieter.
I like long rides and wish to have as little engine noise as possible.
'98 MG V11 EV
'96 URAL SPORTSMAN
'77 MG 850T3 FB

Online PeteS

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Re: '98 V11EV (and similar) RESONATOR (The Tumor)
« Reply #10 on: Today at 08:04:18 AM »
Thought everyone dumped the canister to clear the transmission drain plug.
I am told the canister makes the exhaust much quieter.
I like long rides and wish to have as little engine noise as possible.

The H pipe might increase exhaust level by 1db at best. The canister is fairly efficient at eliminating back pressure so the H pipe didn't help much performance wise either. It was mostly about weight savings. Had forgotten about the drain plug issue I had the H pipe on before the first oil change.

Pete

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Re: '98 V11EV (and similar) RESONATOR (The Tumor)
« Reply #11 on: Today at 08:08:42 AM »
A number of responders stated that the canister offered "significant" noise reduction. I kind of believed them. Hope they are more correct than your 1 db number. Oh well it's only $40 and a bit of time.
'98 MG V11 EV
'96 URAL SPORTSMAN
'77 MG 850T3 FB

Offline Two Checks

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Re: '98 V11EV (and similar) RESONATOR (The Tumor)
« Reply #12 on: Today at 08:46:39 AM »
I removed the tumor from the 90 Cal III and took the cover from the SP II and put it on the Cal. The tumor outlets are longer and are smaller and as others said angle upwards.
Has a bit throatier sound but lets the engine rev up a bit quicker probably due to less restriction.
1990 Cal III f/f  "Il Duce' III"
1987 1000 SPII "Il Duce' II"

 

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