Horrible Mileage - FIXED! 100%
- Sluggo
- Wishin' I was Fishin'
- Location: Portland, Or.
- Contact:
- Status: Offline
Just got back.chitwnvw wrote:C'mon, Sluggo. Don't leave a guy hangin'.
You adjust the accelerator pump by turning the nut on the rod underneath and in between the two barrels of the carb. Crank them in till they are all the way tight without opening the idle stops. Then bring out them equally on both carbs in 1/2 turns increments. Do this until you have a smooth response across the throttle range.
1977 Bus with Sunroof - "Lucky '77"
2000cc Type IV w/Dual Weber 36s,
Aircooled.net SVDA w/Compufire,
Redline Weber Fuel Pump,
Holley Regulator,
Half Ass Brush & Roller Rustoleum Paint Job,
Incomplete Custom Interior,
Dual Batteries,
Crunched Slider Door.
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- Sluggo
- Wishin' I was Fishin'
- Location: Portland, Or.
- Contact:
- Status: Offline
Extended my trip slightly. Bus performed wonderfully.
Throughout the trip I averaged 19.88 MPG! Best mileage was 22.17 MPG traveling on flat land with very little head wind floating around 60-65 MPH. Worst was 18.93 MPG with lots of strong winds and lots of uphill climbs.
Head and oil temps were great. Climbing uphill with tons of wind the highest the temps reached were 400 head and 235 oil. Averaged 350 on the heads and 215 oil.
Loads of power!!! The Bus loves 65-70 MPH. Temps will hover at 360 and 215 with easy acceleration and a very smooth ride.
Didn't burn a drop of oil.
I LOVE MY BUS AGAIN!!!!!
Jetting that worked best:
36 Weber IDFs
135 Main
200 A/C
55 Idle
F-7 E-Tube
33 Pump Jet (7 & 1/2 full turns out)
A road trip is the best way to fine tune your carbs. I was able to pull over and swap out jets to see what performed best where. Things would seem great, then I'd hit a hill and transition would be harder, extended the accelerator pump spring and it took care of it. Cruising would be fine then I would lean out and hit a flat spot at high end acceleration, bumped up the mains slightly and it worked. I really think a road trip with hills is the key. You can see how your carbs react in every situation and adjust accordingly on the fly.
[albumimg]933[/albumimg]
Throughout the trip I averaged 19.88 MPG! Best mileage was 22.17 MPG traveling on flat land with very little head wind floating around 60-65 MPH. Worst was 18.93 MPG with lots of strong winds and lots of uphill climbs.
Head and oil temps were great. Climbing uphill with tons of wind the highest the temps reached were 400 head and 235 oil. Averaged 350 on the heads and 215 oil.
Loads of power!!! The Bus loves 65-70 MPH. Temps will hover at 360 and 215 with easy acceleration and a very smooth ride.
Didn't burn a drop of oil.
I LOVE MY BUS AGAIN!!!!!
Jetting that worked best:
36 Weber IDFs
135 Main
200 A/C
55 Idle
F-7 E-Tube
33 Pump Jet (7 & 1/2 full turns out)
A road trip is the best way to fine tune your carbs. I was able to pull over and swap out jets to see what performed best where. Things would seem great, then I'd hit a hill and transition would be harder, extended the accelerator pump spring and it took care of it. Cruising would be fine then I would lean out and hit a flat spot at high end acceleration, bumped up the mains slightly and it worked. I really think a road trip with hills is the key. You can see how your carbs react in every situation and adjust accordingly on the fly.
[albumimg]933[/albumimg]
1977 Bus with Sunroof - "Lucky '77"
2000cc Type IV w/Dual Weber 36s,
Aircooled.net SVDA w/Compufire,
Redline Weber Fuel Pump,
Holley Regulator,
Half Ass Brush & Roller Rustoleum Paint Job,
Incomplete Custom Interior,
Dual Batteries,
Crunched Slider Door.
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- Amskeptic
- IAC "Help Desk"
- Status: Offline
I look forward to driving it, after our rather gentrified toodling about your neighborhood last summer when I was ranting about the smoothness and sorrowfully experiencing the laggardness.Sluggo wrote: The Bus loves 65-70 MPH.
Didn't burn a drop of oil.
I LOVE MY BUS AGAIN!!!!!
Colin
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
- Sluggo
- Wishin' I was Fishin'
- Location: Portland, Or.
- Contact:
- Status: Offline
I've been easily accelerating up the Hollywood Hills all week. It's truly a pleasure to drive now. I highly anticipate your arrival when you shall lay your healing hands upon my engine and give it that one little tweek that will make it even better.Amskeptic wrote:I look forward to driving it, after our rather gentrified toodling about your neighborhood last summer when I was ranting about the smoothness and sorrowfully experiencing the laggardness.Sluggo wrote: The Bus loves 65-70 MPH.
Didn't burn a drop of oil.
I LOVE MY BUS AGAIN!!!!!
Colin
I have been having one problem. When I first start her up the air/fuel ratio monitor reads lean (this is after the sender has warmed up properly) and she idles rough. Once the engine fully warms up my readings are fine (a little bouncy but fine) and she idles smooth. Then it will occasionally lean out again for no reason. This is all only at idle. Acceleration is smooth and easy and my readings are always at 13 (which is where my engine seems to run best).
Mileage is still good. But driving a few short 5 & 10 minute trips a day makes for very bad mileage. I get between 18.5 & 22 MPG on the freeway depending on hills, winds & traffic. I get between 16.5 & 18 MGP on the streets. But that's only if I actually drive (more than a few minutes spent mostly waiting at lights). With the short little trips I do it's getting about 12 MPG. The past few days I've just been driving around for half an hour before I go to my other building just to legitimize mileage and keep the engine happy.
1977 Bus with Sunroof - "Lucky '77"
2000cc Type IV w/Dual Weber 36s,
Aircooled.net SVDA w/Compufire,
Redline Weber Fuel Pump,
Holley Regulator,
Half Ass Brush & Roller Rustoleum Paint Job,
Incomplete Custom Interior,
Dual Batteries,
Crunched Slider Door.
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- DurocShark
- IAC Addict!
- Location: A Mickey Mouse Town
- Contact:
- Status: Offline
- Sluggo
- Wishin' I was Fishin'
- Location: Portland, Or.
- Contact:
- Status: Offline
That's my feeling. I checked my plugs yesterday and they were a little light (indicating a lean mixture). I upped the mixture screws slightly and it did improve. But I think I'm just covering up an intermittent vac leak.DurocShark wrote:Sounds like you still have some idle mixture issues.
1977 Bus with Sunroof - "Lucky '77"
2000cc Type IV w/Dual Weber 36s,
Aircooled.net SVDA w/Compufire,
Redline Weber Fuel Pump,
Holley Regulator,
Half Ass Brush & Roller Rustoleum Paint Job,
Incomplete Custom Interior,
Dual Batteries,
Crunched Slider Door.
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- chitwnvw
- Resident Troublemaker
- Location: Chicago.
- Status: Offline
- Sluggo
- Wishin' I was Fishin'
- Location: Portland, Or.
- Contact:
- Status: Offline
I'm using an Edelbrock Air/Fuel Ratio Monitor. It has a heater and gives accurate readings within a few minutes. The best recommended spot I could find was right next to the tail pipe flange.dingo wrote:are you using an 02 sensor for the fuel/air ratio? and if so, where did you locate it in the exhaust ?
1977 Bus with Sunroof - "Lucky '77"
2000cc Type IV w/Dual Weber 36s,
Aircooled.net SVDA w/Compufire,
Redline Weber Fuel Pump,
Holley Regulator,
Half Ass Brush & Roller Rustoleum Paint Job,
Incomplete Custom Interior,
Dual Batteries,
Crunched Slider Door.
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- DurocShark
- IAC Addict!
- Location: A Mickey Mouse Town
- Contact:
- Status: Offline
- bottomend
- Hardliest Working Man In Show Business
- Status: Offline
- Sluggo
- Wishin' I was Fishin'
- Location: Portland, Or.
- Contact:
- Status: Offline
You don't. At least not with one air fuel ratio monitor. If you wanted a reading for each barrel you'd need 4 monitors with four senders welded into each exhaust manifold. About $500 for all that not including having the bungs welded in for the sender.chitwnvw wrote:Now if you have one sensor at the end of the line, and 4 carb barrels feeding 4 cylinders, how do you determine what's going on in each cylinder?
1977 Bus with Sunroof - "Lucky '77"
2000cc Type IV w/Dual Weber 36s,
Aircooled.net SVDA w/Compufire,
Redline Weber Fuel Pump,
Holley Regulator,
Half Ass Brush & Roller Rustoleum Paint Job,
Incomplete Custom Interior,
Dual Batteries,
Crunched Slider Door.
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