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- From: jd1y+@andrew.cmu.edu (J Roland Defilippi)
- Newsgroups: rec.autos.tech
- Subject: Poor economy--318 Mopar
- Message-ID: <wfNgfTe00WB_Q70ENI@andrew.cmu.edu>
- Date: 27 Jan 93 07:48:15 GMT
- Article-I.D.: andrew.wfNgfTe00WB_Q70ENI
- Organization: Senior, Architecture, Carnegie Mellon, Pittsburgh, PA
- Lines: 50
-
- In article <1993Jan22.225336.8346@newstand.syr.edu> Bob Valentine
- <ravalent@mailbox.syr.edu> writes:
-
- >>At any rate, the engine is a 1983 with 80,k mi, and a Holly Economaster
- >>Lean Burn Carb. The ignition system has been converted back to
- >>breaker points after the computer started acting up.
-
- >You ARE joking, right? When the motor was swapped, the 4bbl intake,
- >carb, and ignition should have been put on the "new" motor.
- >So now you have a computer carb with a P&C ignition. Jeeeez, who did
- >this motor swap, Sears?
- >At least if the computer was acting up, you should have replaced
- >the computer distributor with a vacuum advance electronic.
-
- 1--4bbl carb in a 2bbl motor:
- The Direct Connection and Moper Performance manuals, written by the
- Chrysler development engineeres, strongly suggest that you not run
- a 4bbl on a base 318 because the valves are not sized for the increased
- flow required to take advantage of the second half of the carb. A stock
- 318 runs a Carter 350CFM 2bbl with no electronic mixture adjustment.
- According to the dealer, the police 4bbl is an 850CFM, produced by GM
- and with electronic feedback for mixture adjustment. Additionally,
- the 318 4bbl had a different cam than standard 2bbl motors, making the
- swap from 2bbl to 4bbl even less effective. To produce an effective
- 4bbl swap, MP recommends a new cam as well as new heads, and once you're
- in that deep you might as well rebuild the motor from the bottom up.
-
- 2--breaker points:
- I put the points in after the car was already out of the shop. Sunday
- evenings 1200 miles away from home often don't leave you with too many
- options. At least I had the distributor with me to get the car home.
- A stock elctronic ignition system offers little above points except
- for its dependability. The spark is marginally hotter than with new
- points. The downside of converting is the parts involved and the need
- to cut into the stock wiring harness, as well as mounting the module,
- which requires drilling holes in the firewall.
-
- >Strangely, most 318's seem to do shitty on gas.
-
- I have owned 9 318 powered mid sized Mopars. My 1970 Coronet 500 with
- points got the best milage at 24mpg from Boston to Phily and back, but
- I had fabricated a hood scoop, and it 2.71 gears behind a 4-speed, so
- maybe that is a bad example. My 1971 Sebring got 18-20 consistantly
- with an auto trans and 3:23 gears. Even now, running bad gas and with
- points, my 67 Charger 383 4bbl 4-spd will turn 14-15 with the cruise on.
- The 318 in my 4x4 will turn 13mpg with the cruise on. In general I
- have found most people will get at least in the high teens for milage,
- which isn't bad for a 4,k+ car with no overdrive.
-
- --Roland
-