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 Back Pressure

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MikeO
Waspie
tarmacburner2
7 posters
AuthorMessage
tarmacburner2
Silver Wing Guru
Silver Wing Guru
tarmacburner2

Number of posts : 1101
Age : 67
Location : Cleveleys, Lancashire, England
Points : 5330
Registration date : 2010-03-27

Back Pressure Empty
PostSubject: Back Pressure   Back Pressure I_icon_minitimeWed Mar 09, 2011 9:23 am

I have noticed quite a bit of back pressure when cruising at motorway speeds. The scoot has a Givi Airflow screen and a Honda top box. Adjusting the position of the screen didn't make any difference at all. Removing the top box did though. As I will be touring in France and elsewhere in Europe not having a top box isn't an option. Has anyone else experienced the back pressure and how (if you did) did you overcome it.
I never get the same back pressure when riding the Burgman. That has a 7Jurock screen (stock + 3") and I use Givi top boxes ranging from about 28 litres up to 45 litres. I may make a plate to fit the Givis onto the Silverwing and try them for size and shape.
Actually the cold on the back maybe an advantage in the warmer climates but up here in Sunny Lancashire it is a bit too nippy for my old bones.
Thoughts and ideas please.
Cheers,
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Waspie
Silver Wing Guru
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Waspie

Number of posts : 2392
Age : 69
Location : Portland, UK
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Registration date : 2009-07-26

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeWed Mar 09, 2011 9:48 am

I felt the back pressure first ride after fitting the Givi Airflow screen.

I thought the benefits of noise reduction out weighed the minimal effect of the pressure I was experiencing on my back and particularly my helmet. Exaggerated by the colder temperatures we have been experiencing over the winter months.

I experimented with differing heights on the Airflow but have not managed to find an optimal setting to eradicate the slight pressure.
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tarmacburner2
Silver Wing Guru
Silver Wing Guru
tarmacburner2

Number of posts : 1101
Age : 67
Location : Cleveleys, Lancashire, England
Points : 5330
Registration date : 2010-03-27

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeWed Mar 09, 2011 11:06 am

Hello Waspie,

I've tried all sorts of heights for the adjustable screen. One thing I haven't tried yet is removing the top part of the screen completely. This will probably be fine for the warmer climate of the Auvergne in June but not for Sunny Lancashire in March.
What top box have you got? I am thinking that the Honda box with it's flat profile maybe a possible cause. Need to make a bracket so I can experiment with the Givi boxes.
Cheers,
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Waspie
Silver Wing Guru
Silver Wing Guru
Waspie

Number of posts : 2392
Age : 69
Location : Portland, UK
Points : 6940
Registration date : 2009-07-26

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeWed Mar 09, 2011 11:34 am

Don't do top boxes!!!!!

Sleek and mean!!!!!
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tarmacburner2
Silver Wing Guru
Silver Wing Guru
tarmacburner2

Number of posts : 1101
Age : 67
Location : Cleveleys, Lancashire, England
Points : 5330
Registration date : 2010-03-27

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeWed Mar 09, 2011 11:51 am

Waspie,

It looks as if I am looking in the wrong place for a solution. Possibly the screen is the culprit.
Cheers,

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Waspie
Silver Wing Guru
Silver Wing Guru
Waspie

Number of posts : 2392
Age : 69
Location : Portland, UK
Points : 6940
Registration date : 2009-07-26

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeWed Mar 09, 2011 2:28 pm

I think so. The air is directed over the head but then eddies behind causing pressure or air rushes in to replace the displaced air caused by a minor vacuum!!!

Tis my theory!!!!
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tarmacburner2
Silver Wing Guru
Silver Wing Guru
tarmacburner2

Number of posts : 1101
Age : 67
Location : Cleveleys, Lancashire, England
Points : 5330
Registration date : 2010-03-27

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeWed Mar 09, 2011 2:36 pm

Yes, Don't understand why I never get it when on the Burgman. Has Suzuki solved the problem and not told Honda! Rolling Eyes
I think I'll try a full tail bag sat on the pillion seat to see if that prevents it. (Another excuse to have to go for a ride!)
Cheers,
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MikeO
Site Admin
MikeO

Number of posts : 3451
Age : 72
Location : Seaham, Co Durham, UK
Points : 8086
Registration date : 2009-06-29

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeWed Mar 09, 2011 3:40 pm

I've got an Airflow screen and E52 topbox.
In all honesty I haven't noticed if there's back-pressure or not.
If there is it isn't enough to bother me. Embarassed
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Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeWed Mar 09, 2011 5:04 pm

I used to get back pressure with the stock screen and a large topbox, but since I added a Laminar Lip I haven't noticed it.
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Sweendog
Maxi-Scooter Rider
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Sweendog

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Registration date : 2009-07-12

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeWed Mar 09, 2011 5:50 pm

You could end the pressure entirely by filling the gaping void between your back and the top box with something. In airplanes, it's called a turtle deck, it's the bit that sticks up above the cockpit and usually has a headrest on the front of it. =)
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tarmacburner2
Silver Wing Guru
Silver Wing Guru
tarmacburner2

Number of posts : 1101
Age : 67
Location : Cleveleys, Lancashire, England
Points : 5330
Registration date : 2010-03-27

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeThu Mar 10, 2011 5:29 am

Sweendog,

I had been thinking along the same lines, you'll see in a posting above from me mentioning the use of a tail bag. At it's full height it should be about 16" high so should make a decent diffuser. I'll post when I have tried it. It won't be today though, high winds and wet stuff trying to land!

Cheers,
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MikeO
Site Admin
MikeO

Number of posts : 3451
Age : 72
Location : Seaham, Co Durham, UK
Points : 8086
Registration date : 2009-06-29

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeThu Mar 10, 2011 6:12 am

That's very interesting!

I rarely ride 'fast' without a bag on the back seat - perhaps that's why I haven't noticed any back-pressure.
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tarmacburner2
Silver Wing Guru
Silver Wing Guru
tarmacburner2

Number of posts : 1101
Age : 67
Location : Cleveleys, Lancashire, England
Points : 5330
Registration date : 2010-03-27

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeThu Mar 10, 2011 8:15 am

We may have stumbled across the solution to prevent back pressure. Serendipity strikes again!

Cheers,

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honda_silver
Silver Wing Guru
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Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeThu Mar 10, 2011 10:00 am

tarmacburner2 wrote:
It looks as if I am looking in the wrong place for a solution. Possibly the screen is the culprit.

I wonder if a tail pipe extender would help??

Either due to a longer pipe or a slightly bent pipe/angled to exit on the side, especially since the windshield is not very wide.
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joncallihan
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Number of posts : 1025
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Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeThu Mar 10, 2011 10:21 am

honda_silver wrote:
tarmacburner2 wrote:
It looks as if I am looking in the wrong place for a solution. Possibly the screen is the culprit.

I wonder if a tail pipe extender would help??

Either due to a longer pipe or a slightly bent pipe/angled to exit on the side, especially since the windshield is not very wide.

This thread has nothing at all to do with exhaust back pressure so how could a tail pipe extender help?
:flower:
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MikeO
Site Admin
MikeO

Number of posts : 3451
Age : 72
Location : Seaham, Co Durham, UK
Points : 8086
Registration date : 2009-06-29

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeThu Mar 10, 2011 10:27 am

Indeed!
We're chatting about the vortex created by the screen as it travels through the air.

The vortex created by a racing car enables another car close behind to be sucked along and thus save energy.

In American parlance it's called 'draughting', I think.
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honda_silver
Silver Wing Guru
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honda_silver

Number of posts : 2454
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Registration date : 2008-12-23

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeThu Mar 10, 2011 12:46 pm

joncallihan wrote:
This thread has nothing at all to do with exhaust back pressure so how could a tail pipe extender help?

I reread the thread, I kept reading the "back pressure" as muffler back pressure ... I accidentally crossed this thread with another.
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tarmacburner2
Silver Wing Guru
Silver Wing Guru
tarmacburner2

Number of posts : 1101
Age : 67
Location : Cleveleys, Lancashire, England
Points : 5330
Registration date : 2010-03-27

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeThu Mar 10, 2011 1:17 pm

Bit early in life to have a 'senior moment' Bill Laughing

Cheers,
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model28a
Silver Wing Guru
Silver Wing Guru
model28a

Number of posts : 2089
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Registration date : 2010-02-03

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeThu Mar 10, 2011 6:01 pm

Hear in the US we get bombarded in the mail by AARP {American association of retired people} at age 50 so it's understandable in a way. Razz Twisted Evil
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tarmacburner2
Silver Wing Guru
Silver Wing Guru
tarmacburner2

Number of posts : 1101
Age : 67
Location : Cleveleys, Lancashire, England
Points : 5330
Registration date : 2010-03-27

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeFri Mar 11, 2011 4:19 am

Sounds as if there is a correlation between senility and where people live!
The pond must help to diffuse whatever environmental factors as senility usually starts at around sixty five over here. You have to be aware though that 'senility' and 'senior moments' are not inter-connected.
Now whereabouts on the screen did I leave my butty? Laughing

Cheers,
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tarmacburner2
Silver Wing Guru
Silver Wing Guru
tarmacburner2

Number of posts : 1101
Age : 67
Location : Cleveleys, Lancashire, England
Points : 5330
Registration date : 2010-03-27

Back Pressure Empty
PostSubject: Re: Back Pressure   Back Pressure I_icon_minitimeSun Apr 24, 2011 7:36 pm

Sorry it is a bit late in posting but thought I would let people know what I found.

Tried a tail bag on the pillion seat and it worked a treat. It is now a semi permanent item on the scoot. If not going on the motorway then it stays in the garage. I have also been experimenting with the position of the Givi Adjustable Windscreen, as yet I haven't found the ideal setting for it yet. I need to as we are off to France for two weeks in June so plenty of quick riding.

Realised why I wasn't getting back pressure problems whilst riding the Burgman - I had a Three Brothers backrest fitted. I have now removed it as the roads here are crap, everytime I went over a bump it thumped me in the back. Will use the tail bag if needs be.

Cheers,
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