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Old 11-12-2014, 10:44 AM   #301
84B23F
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14F (-10C)

1993-245 , LH 2.4, with Bosch 0 280 155 746 Injectors....5w-30 synthetic oil

Key switch to on....wait about two seconds to prime fuel rail...key switch to start...normal startup

IIRC, last year, 245 took a few extra cranks to fire up in colder weather.
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Old 11-14-2014, 02:58 PM   #302
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You forgot to mention the main reason your gas mileage has dropped... It's cold out and the engine takes longer to warm up, so it's in warm up mode longer(aka, uses more fuel).
1993-944 with Regina, which is a Speed Density fuel injection system, and it measures inlet air temperature. I had removed heated exhaust-air-tube since air-box thermostat is not working.

Today, fuel mileage went up some 5-mpg (US) when I hooked air-tube direct to exhaust port for it. I bought an Acurite wireless weather therometer and inserted wireless sensor into air box. Around 32F (0C) at 55 mph, inlet air was running around 100F (38C) on level ground, and upto 111F (44C) in hilly terrain.

Hence, cold inlet air temperature was increasing the fuel burn.
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Old 02-14-2018, 08:11 AM   #303
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I feel like with New cali gas blend every year I get less mpg.
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Old 02-14-2018, 08:19 AM   #304
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....with New cali gas blend every year I get less mpg.
California Reformulated Gasoline Program
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Old 02-14-2018, 12:12 PM   #305
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Quote:
Originally Posted by 84B23F View Post
1993-944 with Regina, which is a Speed Density fuel injection system, and it measures inlet air temperature. I had removed heated exhaust-air-tube since air-box thermostat is not working.

Today, fuel mileage went up some 5-mpg (US) when I hooked air-tube direct to exhaust port for it. I bought an Acurite wireless weather therometer and inserted wireless sensor into air box. Around 32F (0C) at 55 mph, inlet air was running around 100F (38C) on level ground, and upto 111F (44C) in hilly terrain.

Hence, cold inlet air temperature was increasing the fuel burn.
It makes sense that the engine warming up faster will reduce the amount of time that it's in warm-up enrichment, thus providing better gas mileage. How is the power change? Any noticeable difference? Do you/did you install a new thermostat in the airbox so that it stops the hot air intake when the engine is warm? Some of these engines will detonate if they're still getting hot air when warmed up, at least on LH. I don't know if Regina gets around it.
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Old 02-15-2018, 01:35 AM   #306
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Do you/did you install a new thermostat in the airbox.
Yes, but air-inlet duct is now plumbed next to radiator air flow, near top of fan's radiator duct; I really don't like full exhaust heat.

On really cold days, -8F, traveling around 30 mph, it takes some four miles to bring engine up to normal run temperature.

Mileage varies between 25-30mpg...all depending upon terrain, wind, speed, temperature, etc.

Engine is a rebuilt 1984 B23F inserted into a 1993 944 with Rex-I/Regina. This is a higher compression B23F engine, btw. I'm not a power stomper, but power is better than 1993-245.
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Old 02-15-2018, 12:30 PM   #307
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Yes, but air-inlet duct is now plumbed next to radiator air flow, near top of fan's radiator duct; I really don't like full exhaust heat.

On really cold days, -8F, traveling around 30 mph, it takes some four miles to bring engine up to normal run temperature.

Mileage varies between 25-30mpg...all depending upon terrain, wind, speed, temperature, etc.

Engine is a rebuilt 1984 B23F inserted into a 1993 944 with Rex-I/Regina. This is a higher compression B23F engine, btw. I'm not a power stomper, but power is better than 1993-245.
Cool. What camshaft do you have in it? Stock or thinner headgasket?
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Old 02-15-2018, 12:39 PM   #308
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I managed 18 combined on my last tank
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Old 02-15-2018, 02:02 PM   #309
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I managed 18 combined on my last tank


I've been doing 19-21 combined(mostly city) for the past few months(winter).
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Old 02-15-2018, 06:00 PM   #310
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What camshaft do you have in it?
Stock, but when head was rebuilt, it was taken to a machine shop, and shaved.
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Old 02-15-2018, 06:48 PM   #311
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Slap a T in it.
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Old 02-15-2018, 06:55 PM   #312
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Wife's car logged 20mpg combined with her 244 with a T cam.
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-My car: White 1991 244, 308k miles. B230F LH2.4, AW70, R134a retro. Thrush glasspack, anthracite refinished Coronas
-Wife's car: White 1990 244DL, T cam, 190k miles.B230F LH2.4, AW70 w/aux cooler, Duracool AC w/condenser fan, purple refinished Virgos, tow hitch, ipd wagon overload springs.
-PSM 2002 Subaru WRX wagon: 120k miles, Perrin TBE, Perrin turbo inlet, intake, and Y-pipe, GrimmSpeed cross pipe.
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Old 02-15-2018, 07:00 PM   #313
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Wonder how much better my fuel economy be if I had any self-control
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Old 02-15-2018, 07:01 PM   #314
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Wonder how much better my fuel economy be if I had any self-control

You wouldn't blow up rear ends every month.
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Old 02-15-2018, 08:42 PM   #315
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Originally Posted by klr142 View Post
engine warming up faster .... Regina...
Side note - With 0w-40, vehicle sitting overnight, primed fuel rail (ignition on for several seconds) and a cold -10F, engine snaps to life, just like on warmer starts.

LH 2.4 does not ignite until several cranks later...

My 2.8 V6 GM has to roll the crank several times, and then takes about 5 seconds to get up to idle RPM....but its a 300k engine.
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Old 02-16-2018, 01:36 AM   #316
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Interesting. A couple friends have LH cars that have a weird extended crank thing, too. I don't know if what you're describing is normal but it's hard to say without being there.
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Old 02-16-2018, 02:11 PM   #317
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Quote:
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...LH cars that have a weird extended crank thing, too.
Correct, LH 2.4 on 1993-245, late production model....summer, winter, same pattern...extended crank
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Old 02-16-2018, 10:07 PM   #318
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Originally Posted by KeizerBrickGuy View Post
Wife's car logged 20mpg combined with her 244 with a T cam.
My car logs...I'd rather not say
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Old 02-19-2018, 09:10 PM   #319
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You wouldn't blow up rear ends every month.

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Old 02-20-2018, 11:42 AM   #320
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I just got 28 MPG on my last round trip to my parent's place. I was driving like a pansy though
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1991 244 +T LH2.4 m46 287k miles with B cam advanced 4*, 962 fuel & 148 ezk, T5 white injectors, 2.5" exhaust w/ magnaflow straight-through & some kaplhenke suspension goodies

Last edited by esmth; 02-20-2018 at 11:50 AM..
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