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Joined: Feb 2007
Posts: 329
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Feb 2007
Posts: 329 |
I put in a rebuilt 235 in my 52 Styleline Deluxe. (By rebuilt, I mean bored, new pistons, new cam, crankshaft ground and fitted with new bearings, solid lifters, and head done up to handle modern gasoline) Runs like a champ but gets only about 12 MPG at 60 MPH. Has a Rochester hand choke type carburetor. I cleaned the carburetor and drilled the main jet to the specification for a 235 engine. Runs good, good power but much less mileage than others with the same set up. Any ideas or suggestions?
It is a standard three speed transmission, but I did replace the ring gear and pinion with a power glide set of gears. Installed a 20% ratio adaptor in the speedo cable drive and it reads very close to GPS speed.
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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 |
Install a proper 235 engine carburetor.
Gene Schneider
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Joined: Sep 2002
Posts: 2,323 Likes: 6
ChatMaster - 2,000
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ChatMaster - 2,000
Joined: Sep 2002
Posts: 2,323 Likes: 6 |
One thing, it will always be happy running on the rich side but. The engine will protest if it is too lean.
My 1951 1 Ton is now on the road! My 38 Master 4 Door is also now on the road .
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Joined: Dec 2007
Posts: 4,024 Likes: 99
ChatMaster - 4,000
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ChatMaster - 4,000
Joined: Dec 2007
Posts: 4,024 Likes: 99 |
Hi Ron,
Is this a situation where the gearing is making the engine work harder even though it is running at slower speed?
A lot depends on where the engine is operating along its torque curve. If it is running below the torque peak you have to open the throttle quite a bit when there is any increase in load to make the engine respond.
Rusty
VCCA #44680
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Joined: Oct 2004
Posts: 107
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Oct 2004
Posts: 107 |
I don't which carburetor you are using. But you must have the right base plate and gasket. you must have vacuum to close the power piston stay close ( when not needed). yours may stay open and let extra fuel in all the time. ????
what tire size you got?? Stock '54 235, powerglide, 3.55 rear, P275/75/R15 tires, 60mph=2500 rpm. any thing over 2500 rpm gas mileage drop.
Last edited by 36 nut; 09/11/21 01:14 PM.
carson told you this!!
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Joined: Jan 2008
Posts: 828 Likes: 6
ChatMaster - 750
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ChatMaster - 750
Joined: Jan 2008
Posts: 828 Likes: 6 |
Ron have you found a 235 carb, I have one that might work for you.
Denny
Dens Chevys 1927 Speedster 1928 coupe 1941street rod 1947Fleetline 4 door 1949 1/2 ton Pickup (sold) 1954 210 4 door 1972 Monte Carlo 2003 Corvette convt..
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Joined: Feb 2007
Posts: 329
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Feb 2007
Posts: 329 |
Hi Denny, No, I haven't found one as yet. I will PM you. Ron
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