| Slant Six Forum https://slantsix.org/forum/ |
|
| MPG Question https://slantsix.org/forum/viewtopic.php?t=37656 |
Page 1 of 1 |
| Author: | J. Goodman [ Sun Oct 25, 2009 5:07 pm ] |
| Post subject: | MPG Question |
My 64 Dart 270 (automatic trans) managed 18 to 18.7 MPG while between 55 and 60 yesterday during my 800 plus mile trip home. I'm going to put together a checklist and go through each item to ensure the car is running its best. I had hoped for mid 20's. I noticed when I let off the gas to turn off the freeway, the car slowed down rapidly from 55 mph or more. It didn't seem to coast at all. I didn't hear any evidence that the brakes were dragging if they were. It felt almost like I had a high gear ratio rear in the car. |
|
| Author: | Reed [ Sun Oct 25, 2009 6:04 pm ] |
| Post subject: | |
What are the specs of your car regarding: carburetion; ignition; exhaust; rear axle gear ratio; and tire size? |
|
| Author: | J. Goodman [ Sun Oct 25, 2009 6:34 pm ] |
| Post subject: | MPG Question |
Thanks for the quick response. Carb is per the FSM: BBS 36805; Tires per FSM should be 6.50-13 - the car has P185 80 R13s; ignition was changed to Pertronix; FSM gear ratio for the car is 2.93. Can't confirm that tonight, but will try tomorrow. |
|
| Author: | J. Goodman [ Sun Oct 25, 2009 6:36 pm ] |
| Post subject: | MPG Question |
Sorry...forgot you asked about exhaust. Has single exhaust, granted a newer one than stock. I'm hearing what appears to be a leak but haven't located it yet. I believe it is on the mounting surface of the exhaust manifold though. |
|
| Author: | emsvitil [ Sun Oct 25, 2009 7:06 pm ] |
| Post subject: | |
While cruising at 45, downshift to 2nd and see if it downshifts....... If it doesn't, it's not qoing into 3rd............. |
|
| Author: | SlantSixDan [ Sun Oct 25, 2009 9:33 pm ] |
| Post subject: | |
Mileage is not out of line for your setup. You can probably do a little better with careful tuning. Carburetor is 3680s, not 36805 (just for your reference) and given that it's a 1964 original, it may well be overdue for attention or replacement (you know where to go for a new one  ). Tune-up parts and technique suggestions in this thread. Keep on top of the valve adjustment.
|
|
| Page 1 of 1 | All times are UTC-07:00 |
| Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/ |
|