Honda VFR Club  

Go Back   Honda VFR Club > Technical Questions
Forgot Password? Join Us!
Sponsor the Club   Shop        Oracle Central        BikersOracleTours.com  

Reply
 
Thread Tools Display Modes
  #1  
Old 04-05-2011, 17:38
Jatterbox Jatterbox is offline
Registered User
 
Join Date: 08-11-08
Location: Coventry
Posts: 430
Thanks: 0
Thanked 3 Times in 3 Posts
Scottoiler: how exactly does it work?

This may seem like a bone question but I'm still going to ask it. How does the Scottoiler work and NOT affect the bike if it's power source is the vacuum that balances the engine? I've had one from the day a began riding and am very happy with it. I don't doubt it's safety, ability or effectiveness. I just would like to understand more about how it works technically. I looked at the FAQs but couldn't find anything that explains what I have asked. I also realise that I probably need to understand why the vacuum is there firstly before the answer can make sense. So, could any technically minded individual help me further my knowledge?

Many thanks,

Regards - Paul

Sent by iPhone on Tapatalk
Reply With Quote
  #2  
Old 04-05-2011, 17:54
Schtum's Avatar
Schtum Schtum is offline
Club Bard
 
Join Date: 13-03-02
Location: In the Howe of Fife
Posts: 17,769
Thanks: 12
Thanked 250 Times in 182 Posts
The vacuum pipe on the Scottoiler is connected to the diaphragm on the RMV. Start the engine and the depression in the inlet causes atmospheric pressure to lift the diaphragm. This raises the needle in the metering unit and oil begins to flow through the delivery tube.
__________________
"If it were done when 'tis done, then 'twere well it were done quickly" Macbeth
Reply With Quote
  #3  
Old 04-05-2011, 18:00
dave_d's Avatar
dave_d dave_d is offline
Sponsor
 
Join Date: 14-07-07
Location: Standon, Herts
Posts: 984
Thanks: 9
Thanked 121 Times in 110 Posts
The scottoiler's power source is gravity, the vacuum just switches the flow on and off.
Reply With Quote
  #4  
Old 04-05-2011, 18:33
Jatterbox Jatterbox is offline
Registered User
 
Join Date: 08-11-08
Location: Coventry
Posts: 430
Thanks: 0
Thanked 3 Times in 3 Posts
Wow, that was fast. Thanks guys. I can see I need to hone my question now. I understand how the Scottoiler works, both principally and physically. I am curious about why the bike isn't affected with the Scottoiler tapping into the vacuum. So, I guess I should have asked what the vacuum does and why it doesn't matter if the Scottoiler siphons off the pressure?

I appreciate that anyone with a knowledge of engines will know this ad basic principles but that someone isn't me.

Cheers


Regards - Paul

Sent by iPhone on Tapatalk
Reply With Quote
  #5  
Old 04-05-2011, 18:40
polar polar is offline
Registered User
 
Join Date: 20-07-10
Posts: 381
Thanks: 35
Thanked 43 Times in 35 Posts
hi jatterbox

the scottoiler's demands on vacume are so small it cannot cause a problem as far as i am aware.

polar
Reply With Quote
  #6  
Old 04-05-2011, 18:44
Egg on Leggs Egg on Leggs is offline
Registered User
 
Join Date: 24-06-03
Location: Birmingham
Posts: 10,137
Thanks: 35
Thanked 162 Times in 127 Posts
Quote:
Originally Posted by Jatterbox View Post
Wow, that was fast. Thanks guys. I can see I need to hone my question now. I understand how the Scottoiler works, both principally and physically. I am curious about why the bike isn't affected with the Scottoiler tapping into the vacuum. So, I guess I should have asked what the vacuum does and why it doesn't matter if the Scottoiler siphons off the pressure?

I appreciate that anyone with a knowledge of engines will know this ad basic principles but that someone isn't me.

Cheers


Regards - Paul

Sent by iPhone on Tapatalk
Because it is a closed system, think of it as sucking on an empty plastic bottle, no matter how hard ou suck you cannot suck any air out of the atmosphere. The collapse of the bottle equates to the atmosphere opening the valve, the atmosphere cannot get past the valve.
Reply With Quote
  #7  
Old 04-05-2011, 18:47
Jatterbox Jatterbox is offline
Registered User
 
Join Date: 08-11-08
Location: Coventry
Posts: 430
Thanks: 0
Thanked 3 Times in 3 Posts
Thanks polar. So, could I ask why there are 4 very convenient vacuum pipes. I can understand 1 for each cylinder but then are the pipes to allow pressure testing of them? I don't know why they would be there otherwise, unless mr H just wanted to help with chain oiling devices of the future? (would enter shoulder shrug smiley but can't on this device).




Regards - Paul

Sent by iPhone on Tapatalk
Reply With Quote
  #8  
Old 04-05-2011, 20:46
steve27bha's Avatar
steve27bha steve27bha is offline
The skinny sassenach
 
Join Date: 01-02-03
Location: West Lothian
Posts: 6,986
Thanks: 11
Thanked 295 Times in 281 Posts
Quote:
Originally Posted by Jatterbox View Post
Thanks polar. So, could I ask why there are 4 very convenient vacuum pipes. I can understand 1 for each cylinder but then are the pipes to allow pressure testing of them?
Yes, to allow measurement of the vacuum in each inlet tract (between the closed throttle butterfly of the carburettor/throttle body and the cylinder) and give a measure of the reduction in pressure compared to the outside atmosphere.
Quote:
Originally Posted by Jatterbox View Post
I don't know why they would be there otherwise, ...
Connecting each of the pipes to a gauge or, better IMHO, a Morgan Carbtune allows them to be balanced (by adjusting the amount of air admitted at idle) so each cylinder is giving the same amount of "suck" and thus a similar amount of power, particularly at low revs where you want the engine to feel smooth.
HTH
__________________
steve27bha : TDM900A + CBX750FE

Last edited by steve27bha; 04-05-2011 at 20:52.
Reply With Quote
  #9  
Old 04-05-2011, 22:02
greenman2 greenman2 is offline
Registered User
 
Join Date: 30-08-09
Location: Gloucestershire
Posts: 86
Thanks: 0
Thanked 0 Times in 0 Posts
Part of why the Scottoiler has no effect on the bike is that the volume of the system is very small, if it was large then it might have more effect- like the vacuum powered windscreen wipers on my first car- Ford Popular 100E.
Reply With Quote
  #10  
Old 04-05-2011, 22:57
Jatterbox Jatterbox is offline
Registered User
 
Join Date: 08-11-08
Location: Coventry
Posts: 430
Thanks: 0
Thanked 3 Times in 3 Posts
Thanks guys, starting to understand now.

And thanks for your tolerance. I know that to a mech, such a question is rudimentary but all I know of engines is what I learn on here and then apply to my bike.

I've been with this site since I learned to ride. Everything I've learnt has been with the support of the members here and I can tell you, I've learnt a lot, saved money and developed my confidence through Vfr club. I'd buy anyone of you a beer if I met (or do meet) you out and about.


Regards - Paul

Sent by iPhone on Tapatalk
Reply With Quote
  #11  
Old 05-05-2011, 15:59
leogreek leogreek is offline
Registered User
 
Join Date: 17-04-10
Posts: 334
Thanks: 12
Thanked 11 Times in 10 Posts
While I cannot verify this from any experience of my own, I was told by my garage that a scottoiler could interfere with the bike slightly when the reservoir of the scottoiler is empty. To what extent this is true I can't say, but I would agree that as the vacuum required for the oiler is negligible it shouldn't matter.
Reply With Quote
  #12  
Old 05-05-2011, 16:30
Jatterbox Jatterbox is offline
Registered User
 
Join Date: 08-11-08
Location: Coventry
Posts: 430
Thanks: 0
Thanked 3 Times in 3 Posts
Cheers Leogreek, I never even considered that. Not that i would let it run dry but it's a very good point. That's why I will always ask. Every day's a skool day!


Regards - Paul

Sent by iPhone on Tapatalk
Reply With Quote
  #13  
Old 05-05-2011, 19:15
evengreyerbiker evengreyerbiker is offline
Born to be Born Again
 
Join Date: 02-03-10
Location: Congleton
Posts: 136
Thanks: 4
Thanked 21 Times in 19 Posts
No. As stated earlier the vacuum pipe goes to the diaphragm so nothing of any noticeable significance can flow through the pipe regardless of the oil level.

My VTEC A9 backfired at small throttle settings from new but disconnecting the PAIR valve fixed it completely.

Last edited by evengreyerbiker; 05-05-2011 at 19:41.
Reply With Quote
  #14  
Old 05-05-2011, 19:31
saintrommel's Avatar
saintrommel saintrommel is offline
saintrommel
 
Join Date: 27-04-10
Location: bolton lancs
Posts: 2,072
Thanks: 326
Thanked 254 Times in 197 Posts
Well that's the theory, unless you mount it out of the way (under the seat)

and in a heatwave in the middle of Germany the little darling dumps the lot

in 10 mins. Best to mount where there is good cool airflow for best results.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT +1. The time now is 02:40.


Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright Bikers Oracle Ltd 2004 - 2009