Go Back   EcoModder Forum > EcoModding > Off-Topic Tech
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 05-19-2010, 01:51 PM   #1 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,173

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
Mitsubishi
90 day: 56.69 mpg (US)
Thanks: 2,471
Thanked 2,537 Times in 1,529 Posts
1965 Honda 65 - mystery oil lines

This past weekend I was working on my dad's old motorcycle, a 1965 Honda 65 (yep, 65 cc monster, woo ). I've ridden it a few times, but it hasn't been started in years. Here is a pic I found online, looks very similar and its still in great shape considering the age.




So, I took the carb off and cleaned it up. However, while doing that I noticed two oil lines that I can't figure out what they are for. One comes from the crankcase up to the carb, and then connects to the other line and it goes back down to the side of the engine block. I'll get exact pictures, but here is one I found online and marked up.

Any idea what these lines are for? I'm thinking they might be using the vacuum to pull oil up for oiling... something. I've just never seen something like it before.


Attached Thumbnails
Click image for larger version

Name:	1966_honda_bike.jpg
Views:	1712
Size:	44.7 KB
ID:	6060  
__________________
Current project: A better alternator delete
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 05-19-2010, 01:55 PM   #2 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,234

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.07 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)
Thanks: 3,796
Thanked 6,645 Times in 3,444 Posts
Cool bike. Can't help you though - sorry!
__________________
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Old 05-19-2010, 02:48 PM   #3 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,020 Times in 1,303 Posts
Probably using the hot engine oil to get better atomization of the air-fuel mixture. Could also provide some cooling of the engine oil by transferring the heat to the incoming air-fuel mixture.

Those variable venturi (SU type) carburetors are very prone to icing. In some versions the "choke" is simply a means of moving the seat a significant distance from the needle, instead of a butterfly that actually restricts the airflow into the carb.

Pure speculation on my part.

regards
Mech
  Reply With Quote
Old 05-19-2010, 02:56 PM   #4 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,173

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
Mitsubishi
90 day: 56.69 mpg (US)
Thanks: 2,471
Thanked 2,537 Times in 1,529 Posts
This one does have a spring loaded butterfly for the choke.

I'm wondering if it isn't just the heat thing though. Come to think of it, I don't exactly recall there being a hole from the oil passage to the air passage going through the carb... Perhaps the oil is pumped through it.
__________________
Current project: A better alternator delete
  Reply With Quote
Old 05-19-2010, 10:56 PM   #5 (permalink)
Master EcoModder
 
Ryland's Avatar
 
Join Date: Jan 2008
Location: Western Wisconsin
Posts: 3,903

honda cb125 - '74 Honda CB 125 S1
90 day: 79.71 mpg (US)

green wedge - '81 Commuter Vehicles Inc. Commuti-Car

Blue VX - '93 Honda Civic VX
Thanks: 867
Thanked 433 Times in 353 Posts
If you look under 1965 S65 right hand crank case cover you can see the lines you talk about, one of them looks to have either a filter or a check valve?
No label as to what they are tho as they are out of stock.http://www.mrcycles.com/fiche_section_detail.asp
  Reply With Quote
Old 05-20-2010, 12:38 AM   #6 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts


This fiche from BikeBandit shows them as "oil hose A" and "oil hose B", but again, out of stock.

Chances are, earlier posters are correct, and it just uses heat from the oil to help vaporize the fuel or heat the intake air charge.

Honda's always been famous for that kind of stuff, anyway.
__________________
"ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 05-20-2010, 06:08 AM   #7 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,173

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
Mitsubishi
90 day: 56.69 mpg (US)
Thanks: 2,471
Thanked 2,537 Times in 1,529 Posts
Yup, those are the oil lines. Heat makes sense.

__________________
Current project: A better alternator delete
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Restore oil additive... suspectnumber961 The Unicorn Corral 46 11-20-2018 12:15 AM
Effect of gear oil viscosity on transmission efficiency (Metro owners take note) MetroMPG EcoModding Central 44 12-08-2014 11:22 PM
Project: Rebuilding an '01 Honda Insight as a nonhybrid Fabio Hybrids 158 01-12-2013 11:59 AM
Filling oil just to min line? better mpg? Fr3AkAzOiD EcoModding Central 36 04-17-2010 10:58 AM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com