Go Back   EcoModder Forum > EcoModding > Instrumentation
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 04-23-2015, 11:42 PM   #1 (permalink)
EV convert
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 7,901

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 124.63 mpg (US)
Thanks: 180
Thanked 2,523 Times in 1,970 Posts
Fuel in the bowl

Converting over to electric fuel pump on the carb should allow me be driving along, cut the fuel pump off and do a time/speed comparison from the time the fuel is switched off until the engine sputters indicating it has consumed the 200 or so ml of fuel in the bowls.
I don't know how much volume the fuel bowl holds but I can find out next time I pull the carb. It just needs to be consistently full when I turn it off.
The way the fuel floats are it should give a very stable fuel level in the bowl.

I could also use it to cut evaporative emissions. Once I learn how far it goes on a bowl full of fuel I can turn off the fuel, keep driving that last little bit home and could pull into the drive way with an empty or almost carb.
Usually the engine heat conducts up into to the fuel and off gasses the lighter components of gasoline to the surrounding environment.
It could make cold weather starting easier too, when I start it flip the fuel pump on several seconds before cranking and get a bowl full of nice fresh volatile gasoline.

Has anyone tried this?

__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
  Reply With Quote
The Following User Says Thank You to oil pan 4 For This Useful Post:
Fat Charlie (04-24-2015)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-24-2015, 02:10 AM   #2 (permalink)
herp derp Apprentice
 
Join Date: Oct 2008
Location: Lawrence, KS
Posts: 1,032

Saturn-sold - '99 saturn sc1
Team Saturn
90 day: 28.28 mpg (US)

Yukon - '03 GMC Yukon Denali
90 day: 14.4 mpg (US)
Thanks: 42
Thanked 315 Times in 226 Posts
Haven't tried it, just thinking about potential pitfalls... If your carb has an electronic mixture valve / jet, running the bowl out might screw with your fuel trim for back to back testing
  Reply With Quote
Old 04-24-2015, 02:47 AM   #3 (permalink)
EV convert
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 7,901

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 124.63 mpg (US)
Thanks: 180
Thanked 2,523 Times in 1,970 Posts
It a very non-electronic 600cfm edelbrock performer.
Electronics are external, such as fuel pump, wide band O2 meter, HEI distributor.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
  Reply With Quote
Old 04-24-2015, 03:17 AM   #4 (permalink)
herp derp Apprentice
 
Join Date: Oct 2008
Location: Lawrence, KS
Posts: 1,032

Saturn-sold - '99 saturn sc1
Team Saturn
90 day: 28.28 mpg (US)

Yukon - '03 GMC Yukon Denali
90 day: 14.4 mpg (US)
Thanks: 42
Thanked 315 Times in 226 Posts
Now I'm thinking you should be figuring out how to use your O2 output to cycle the fuel pump on and off #oldskoolleanburn
  Reply With Quote
Old 04-24-2015, 10:32 AM   #5 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,021

CM400E - '81 Honda CM400E
90 day: 58.68 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: 2,341
Thanked 2,417 Times in 1,462 Posts
I thought the lower the level of fuel in the bowl the leaner you ran? I'm no carb expert though!
__________________
Current project: Adding regenerative braking to the Mirage
  Reply With Quote
Old 04-24-2015, 10:47 AM   #6 (permalink)
Rat Racer
 
Fat Charlie's Avatar
 
Join Date: May 2011
Location: Route 16
Posts: 3,426

Al the Third, year four - '13 Honda Fit Base
Team Honda
90 day: 42.9 mpg (US)
Thanks: 1,332
Thanked 1,475 Times in 939 Posts
Evaporative emissions, yes, but also just plain wasted fuel. That's a mod that'll add up fast- every time you park it.
__________________

Quote:
Originally Posted by sheepdog44 View Post
Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

  Reply With Quote
Old 04-24-2015, 12:22 PM   #7 (permalink)
EV convert
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 7,901

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 124.63 mpg (US)
Thanks: 180
Thanked 2,523 Times in 1,970 Posts
Quote:
Originally Posted by Daox View Post
I thought the lower the level of fuel in the bowl the leaner you ran? I'm no carb expert though!
I believe this will be the case. As long as its consistent it will work.

I just want to use it to compare various conditions, cold engine versus hot, higher and lower speeds, trailer versus trailerless, intake air at various temperatures, different levels of ignition timing, aero mods.

If it leans out too much too fast that will pretty much make it useless for testing different levels of ignition advance, but also might allow me to find a lean burn sweet spot.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.

Last edited by oil pan 4; 04-24-2015 at 12:31 PM..
  Reply With Quote
The Following User Says Thank You to oil pan 4 For This Useful Post:
Daox (04-24-2015)
Old 04-24-2015, 12:27 PM   #8 (permalink)
EV convert
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 7,901

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 124.63 mpg (US)
Thanks: 180
Thanked 2,523 Times in 1,970 Posts
Quote:
Originally Posted by Fat Charlie View Post
Evaporative emissions, yes, but also just plain wasted fuel. That's a mod that'll add up fast- every time you park it.
Yeah if nothing else I will have a novel way to reduce evap, make it less stinky and get it to start faster making the battery and starters life easier.

Using the electric fuel pump is kind of must, that way I can relocate the fuel line away from the engine and remove the possibility of vapor lock. Which is a strong possibility here at higher elevation and also because its normal to see 80'F+ while winter gas is still in production.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
  Reply With Quote
Old 04-26-2015, 01:05 AM   #9 (permalink)
EV convert
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 7,901

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 124.63 mpg (US)
Thanks: 180
Thanked 2,523 Times in 1,970 Posts
I think using an electric fuel pump, turning it off, running the fuel out of the carb bowl would be a very good idea.
While changing out jets today about 10% of the fuel evaporated right before my eyes, when I turned the engine off heat flowed up the intake runners to the carb its self and heated up the fuel pretty good.
I am thinking the fuel bowls holds some where around 100 to 120ml of fuel, not 200 like I was thinking. Next time I pull one of these carbs and dump the fuel (well I save it, remember I am too cheap to dump perfectly good fuel on the ground). Or when I install the electric pump and run it out of fuel before a jet change I will manually fill it back up and measure the fuel that goes in it to that normal level.
Every time I pulled the top of the carb off to change jets the level was at exactly the same place, so that is good.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
  Reply With Quote
Old 04-26-2015, 08:58 AM   #10 (permalink)
Master EcoModder
 
nemo's Avatar
 
Join Date: Nov 2010
Location: US
Posts: 920

Chief - '06 Pontiac Grand Prix
90 day: 25.55 mpg (US)

SF1 - '12 Ford Fiesta S
90 day: 25.66 mpg (US)
Thanks: 165
Thanked 204 Times in 159 Posts
Interesting idea. Couple of thoughts. The fuel bowl has a high level and low level and will not always contain the same amount of fuel, the difference may be a trivial amount. Also will the pressure in the fuel line allow the bowl to partial refill even after the pump is shut off. These concerns are only if you are tiring to produce a amount of fuel used. If you go with your original idea of time and you throw out the top 20% and the bottom 20% of the results for each test you should have a good idea which ones work.

As for wasting fuel if you kill the pump while still moving and roll to a stop I see no additional waste of fuel.

__________________

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com