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Joined: Oct 2002
Posts: 103
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Oct 2002
Posts: 103 |
I have a delima on the fuel consumption on my 28.I have always felt that i was getting poor milage.I,ll run her up to about 15 miles and she will take a guarter of a tank.I had the valves done,gone thru the carb,changed plugs,and played with the timing so much i thought i was going to wear the clamp out. :confused: Does any one have any idea's or are these ol cars just guzzlers.She sure runs like a top though !!! 
isn't 28 great
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Joined: Dec 2001
Posts: 217
Backyard Mechanic
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Backyard Mechanic
Joined: Dec 2001
Posts: 217 |
Well, lets see. Are you using the original vacuum tank or an aftermarket fuel pump? -R 
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Joined: Mar 2002
Posts: 39
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Mar 2002
Posts: 39 |
They always were a tad thirsty. Max I ever got was 28mpg.It is not the most efficient engine. Some points to check. Timing set so that it 'just' does not ping at 30mph with the foot flat to the boards and hand adjuster set to max. This give it about 50 degrees of advance at about 50mph. Are the plugs fouling. Shoulb be a dusty blackish, not drenched in soot or oily. Correct plugs? It's a long way from the plug hole to the combustion chamber. No fuel leaks, from tank to carby. If you are using an aftermarket fuel pump, should be putting out about 1-1.5lbs pressure.If not, add a pressure regulator.If the pressure is too high, carby will flood. Use the vacuum tank if you can, much better, and will possibly only let you down on a long steep run uphill. Valve clearances set as per manual, possibly a thou or 2 more. Mine seemed to breath a little better this way which is contradictory I know, but must have something to do with the valve overlap. Is the valve timing correct, no not the valve clearances, the timing. Info in the manual. I hooked up the 'intake air warmer', you know the pipe that runs from the heat exchanger on the exhaust, and it ran a little worse. Reasoned that the density of the air had altered, hence changing the air/fuel ratio slightly. But it does maintain a reasonably constant air temp when the engine gets up and running, so an easy adjustment to make on the carby. Check the jets in the carby, info avail elsewhere as to the correct jetting. Pop a thermostat in, maintains a constant operating temp, and it is very easy to adapt a modern one at about 180 degrees. With the standard gearing, you should be able to sit on 45-50mph all day, with no stresses on the systems.
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Joined: Oct 2002
Posts: 103
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Oct 2002
Posts: 103 |
Thnx for all the possibilities john,I am running on an elec fuel pump.I guess i better check the reg setting. 
isn't 28 great
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
Hi 28chevrolet, I would suggest you abandon the electric fuel pump idea. Even with a regulator you can't reduce the pressure to the normal flow of gravity from approximately 2 feet. I run all my 4-cylinder cars on the vacuum tank, and if working properly and well sealed at each joint, they perform flawlessly. As proof, my 1925 roadster made it to the top of Pikes Peak without difficulties. Follow all the recommendations of John McFarland and you should improve your mileage significantly. Happy motoring, 
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Jan 2002
Posts: 809
ChatMaster - 750
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ChatMaster - 750
Joined: Jan 2002
Posts: 809 |
28chevrolet
All the things John said were right, however where John comes from (Aust) 99.99% of 28's are tourers. I currently run a 28 2 door sedan and have run 28 tourers. There is a big difference between the sedans and tourers re the extra weight.
When I bought my 28 it had an electric fuel pump fitted. If you persist with the electric fuel pump, do as John suggests and lower the pressure, but you MUST use a needle (of needle and seat variety) with a rubber tip, otherwise the pressure forces the fuel past the steel tip.
My advice, which I did on my 28 is to get rid of the electric fuel pump, and go back to the old trustworthy vacuum tank
Chris
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Joined: Dec 2001
Posts: 11,162
ChatMaster - 10,000
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ChatMaster - 10,000
Joined: Dec 2001
Posts: 11,162 |
Yes a decent well maintained vacuum tank works very well in any conditions I have encountered in the tours we have been in in the last 1 and half years we have had a '28 we get good mileage, 17 to 20 mpg. Before going on the 2003 National Pre 1929 tour in New Mexico I decided maybe I might need an auxilary electric pump "just in case" since we were going to be driving in the mountains in the summer heat, so I mounted a Delco electric pump near the tank and added a mom on toggle switch so that in case the vacuumn pump would not keep up I could hit the switch and fill the vacuum tank. I never did need to run the electric on that tour or any since, probably was a waste of money, but it makes me "feel good".
Life's a long winding trail, love Jesus and ride a good horse!
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
Gene Schneider
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Joined: Oct 2002
Posts: 103
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Oct 2002
Posts: 103 |
Australia her i come !!! thnx guys
isn't 28 great
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