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Fuel Economy of EF & EL 

 

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 Post subject: Fuel Economy of EF & EL
Posted: Thu Sep 29, 2005 2:27 am 
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Can anyone tell me why the EL has better fuel economy (12L per 100km), than the EF 15L per 100km). Did they change the intake manifold or the exhaust manifold? Or is it due to the ignition changes, a cam change or the extra counterweights on the crankshaft? Any answers?

 

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Posted: Thu Sep 29, 2005 9:53 pm 
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I have an EF and drive long K's I average around 8-9L / per 100 K's on the Hwy, and in the city I get 11L /per 100, however If i boot it in the city I average 12.9.

EF Ser.2 tickford Head, Headers, 2.5" pipe, deburred intake plenum, 3.23lsd and a lovely Manual box.

ohh, I do drink more fuel if I use the XR6 ECU, around 1litre both hwy and city.

I have no idea how they came up with the EL drinks less.. sales pitch maybe for the cabbies?
every EF and EL i've been in seem to average the same fuel usage..
ahh well! thats my useless 2 cents.

Andrew

 

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Posted: Thu Sep 29, 2005 11:02 pm 
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wow your all better off i have a ef xr6 and get about 16l per 100k but then again i like to put my foot down

 

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Posted: Thu Sep 29, 2005 11:44 pm 
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I don't think there were any changes in spec between the EF & EL engines apart form the intake plumbing.
As far as fuel economy goes I get about the same figures out of my manual EF XR6 as Krytox gets out of his car, mine is stock apart from 2.5 inch cat back exhaust.

Cheers,

Alan.

 

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Posted: Fri Sep 30, 2005 2:24 am 
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The head design was also changed a bit.

EF's have a 94AA or 94AB model head.

EL's have a 95AA (pre Feb 98) or 96DA (post feb 98).

The 96DA heads from the Hybrid motors tended to have better fuel consumption than previous heads... And im guesing that the 95AA heads might be better than the 94's as well.
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Posted: Fri Sep 30, 2005 7:39 pm 
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Was there a stamping or something on the head to tell the different models apart?

And what was the hybrid motor .... was that basically an AU head on EL block?

 

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Posted: Fri Sep 30, 2005 11:54 pm 
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Yep. Stamping on the front of the head.

Could be anyone as follows:

Standard I6
94AA
94AB
95AA
96DA

Tickford Head
94DT
95DT
96DT

The hybrid head (96Dx) uses AU valves, valvetrain and head design. Where the ports are the smallest of the lot. Must help with keeping up the air speed.
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Posted: Sat Oct 01, 2005 2:05 pm 
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The new Ford head I've just fitted to my 94 EF is marked 95DA, the label on the box read EF 6049A, the original head is marked 94DA. The new head had a few minor changes to the areas around valve guide where it comes through the port roof, the lump or material surrounding the valve guide on both intake and exhaust has been removed so the flow is much smoother. Before replacing the head my fuel economy was terrible about 17,18 L per 100km, after the new head was fitted its back to 11/12 L. When removing the exhaust manifold a lot of the bolts were finger tight and you cold see where it had been leaking and moving a bit. The exhaust guy I use said this was more than likely the cause of the high fuel consumption, air was being sucked into the manifold and the oxygen sensor was getting a lean reading so the ECU was compensating by richening up the mix.

 

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Posted: Sun Oct 02, 2005 10:36 pm 
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just to add my 2 cents worth, i've just driven 310km in my EF futura, and still have over 3/4 of a tank left. :D i'm impressed.
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Posted: Sun Oct 02, 2005 11:59 pm 
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drewinEF wrote:
just to add my 2 cents worth, i've just driven 310km in my EF futura, and still have over 3/4 of a tank left. :D i'm impressed.


Yeah.... But now watch it dive and hit the empty mark before you know it... :D

Ive done the same. 820km is my best tank... First half of gauge takes forever to go... But once thats hit, watch it fall..
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Posted: Mon Oct 03, 2005 12:05 am 
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arm79 wrote:
First half of gauge takes forever to go... But once thats hit, watch it fall..

Yeah .... they seem to do that .... mine does the same :lol:

 

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Posted: Mon Oct 03, 2005 2:34 am 
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Sierra wrote:
arm79 wrote:
First half of gauge takes forever to go... But once thats hit, watch it fall..

Yeah .... they seem to do that .... mine does the same :lol:


Ditto on that... mine takes ages to go through the top of the tank and then it plummets to empty ... lol.

I get around 8-9L/100 on the country roads and about 11-12L/100 city driving....
I reckon im gonna find myself a mighty boy ute with the fuel prices going up. :P

 

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Posted: Mon Oct 03, 2005 12:42 pm 
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just to add my 3c worth my EL ghia dont get anywhere near 12l/100km

i do same city granny drivin day in day out and the avg was 15.5

i fitted new fuel(ryco)/air(wesfil) and now it averages 15.0

all standard only extractors fitted
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Posted: Mon Oct 03, 2005 1:08 pm 
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tiny56 wrote:
just to add my 3c worth my EL ghia dont get anywhere near 12l/100km

i do same city granny drivin day in day out and the avg was 15.5

i fitted new fuel(ryco)/air(wesfil) and now it averages 15.0

all standard only extractors fitted


Sounds like something else is wrong there.

Dont get anywhere near that bad in my EL Ghia.

I usually get 13/14's around city. 15 to 17 if I flog the poor thing.

Drops down to 8 to 9 l/100km on freeway driving.

Yesterday I drove to Heathcote Dragway, about 140km one way trip... Did 9 runs on the strip, and drove back. Speeds varied between 60km/h and 165km/h (mainly in the 90 to 110km/h zone), and I got a 10.9l/100km average by the trip computer.

What's the build date of your car, just out of curiosity?
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Posted: Mon Oct 03, 2005 5:25 pm 
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arm79 - build date is "march 97" - car has done 145k's ,always serviced,runs fine,only mods are tickford snorkel & extractors and never got any better than 15l/100ks city driving and 10l/100ks country

what could cause bad ecomomy??
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