1991 Civic dual carb questions

What is the fuel tank size of a 91 Civic sedan? And can anyone tell me what would be a fair fuel consumption figure for this vehicle in an automatic?

Dual carb 1.5 version

I am getting high 10s or low 11s per 100kms around town which is higher than I would expect. 200,000kms on the odo.

I also noticed that when I dont use high octane fuel I get a ticking sound when accelerating hard (pinging? or just carby noise?). I asked my old man about this (he serviced the car since new) and he said it has done this for many years running on 91 octane and is due to the aggressive timing and don't worry about it. He has adjusted the timing before and the ticking comes back soon after. He also said it has been like that for so many years if it is causing any problems we would know about it by now. The car doesn't appear to be blowing any smoke and still pulls away just like I remember it did when we purchased it.

I think it is due for a tune but I think I will run it on high octane anyway. Anyone have a view about that? The noise is more annoying than anything else.

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Originally Posted by yfin

I think it is due for a tune but I think I will run it on high octane anyway.

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how do u tune a stock ecu?
or do u mean a service?

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Originally Posted by [ricer]

how do u tune a stock ecu?
or do u mean a service?

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It is carby so you can make some adjustments to the carburettor, timing

oicccc cool cool

I run mine on shell 95 get the best k's out of it out of what i have tested so far 400km city driving 500 highway i believe the tank is 40l

The tank is 45l according to a broshure i downloaded (can't remember where from but i can send you a copy if you want)

I used to get the same ticking/pinging when i run it on normal petrol but it's gone since i started using 98RON. I got a EFi engine but still same thing happens.

Fuel economy wise, depends how i drive it i guess, can go as good as 10l (even 9 if i'm being a granny) to as bad as 12l

i get at least 450 out of a tank (45l) on my dual carb even without driving like a grandma, but i find if i run good 98 octane (bp) my car tends to run really rough when warming up and during this time occasionally stalls, i dont know if its because the car wasnt ment to run such a high octane, but try it on the 95 or the boost98 (10% ethanol) they seem to get the best out of it

I get about 500Km from my ED GL man sedan b4 refuelling. I use Shell premium 95 for that car. Average fuel consumption around 7L or just under for me. Air cond on most of time and city driving ( not bumper to bumper stop start but ).

Official city fuel consumption for my car is 8L/100Km according to redbook.com.au

Those are some good numbers you guys are getting. I am only onto my second tank but for the first I only got about 400kms in the city (short trips). Lets see how it goes for this tank - I am trying 98 ron now. :)

I also find that even close to the empty line there is still some 10L left in the tank which reminds me of my old EG breeze. May be they want ppl to be cautious esp the car doesn't come with a low fuel warning light.

my friend use mobil 8000 on his caby engine ... he can run around 450kms and mine use 91ULP only got about 330 to 350kms in the city.

yea, i drive an ed6 hatch, i know its a bit lighter than the sedan but it shouldnt be too far off...
i used 2 do about 420-430km per tank on 98ron...then i put in bosch ignition leads and sparkies and its doing about 480km's per tank...and its not an exaggeration...even after i put headers, hi flow cat, and 2 inch cat back, the fuel economy wasn't hurt...its good value for getting some economy from the d15's...

Are you guys kidding?! I would always get between 6-7L per 100kms. My worst was 8.04L/100kms, and that was when i did an advanced driving course with it. The car has a 45L tank. Ive got Excel sheets to show fuel prices and km's driven on how many L's.

My new sedan which is MPFI with a DOHC ZC gets between 7-9. I dont get why it varies so much because my driving doesnt.

damn...mpfi zc motor...i want one...

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Originally Posted by ~Sp33~

Are you guys kidding?! I would always get between 6-7L per 100kms. My worst was 8.04L/100kms, and that was when i did an advanced driving course with it. The car has a 45L tank. Ive got Excel sheets to show fuel prices and km's driven on how many L's.

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Is that manual or auto? It is still early days so lets see what the next tank gets. The other thing is the car is being used for very short trips - eg to the train station just 1km away, to the local supermarket etc. Not ideal environment to get good figures. I have the Euro for more extended trips.

im pretty sure if running a higher octane fuel on older carby engines that arent made for it the timing should be matched to suit (so yes, a tune is whats needed). I personally wouldnt bother with running the higher octane fuel if its going to cause pinging.
I know my mate had this problem with his honda city and he is the same... will not use anything but PULP. Our trade school teacher said the timing needed to be advanced if running the higher octane fuel or it would ping.
Im pretty sure that advancing it a few degrees helped it quiet a bit.

I could be wrong.. someone correct me if i am. Just what i can recall from my trade school teacher and my mates conversation.

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Originally Posted by Paul1985

im pretty sure if running a higher octane fuel on older carby engines that arent made for it the timing should be matched to suit (so yes, a tune is whats needed). I personally wouldnt bother with running the higher octane fuel if its going to cause pinging.
I know my mate had this problem with his honda city and he is the same... will not use anything but PULP. Our trade school teacher said the timing needed to be advanced if running the higher octane fuel or it would ping.
Im pretty sure that advancing it a few degrees helped it quiet a bit.

I could be wrong.. someone correct me if i am. Just what i can recall from my trade school teacher and my mates conversation.

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I am actually suggesting the opposite - if I run on low 91 octane the engine will lightly ping. It is tick tick tick tick.... Apparently it has done this for years and years... I put in high octane and it is pretty much silent. I am sure with a good tune, new leads and spark plugs etc it could be resolved but I am avoiding pouring money into this car save for what absolutely needs to be done (+ regular servicing).

its a 45l tank. I get around 500km a tank in the city and over 600 on the highway. I have tuned my carbies for optimum performance and i also run 98oct fuel. Ive set my timing to 25deg advanced and it doesnt ping EVER.
It has extractors and from the front pipe its 2.5" all the way to the twin cannon setup in the rear


Even when its extremely hot :) It makes plenty of power and has no problems spinning up the 215s its runnin :)

seeing its 200k then i suggest changing your timing belt too :D

ph btw... ur car wont ping if ur timing is not advanced enough. thats a load of crap

If your cars pinging, then i suggest u adjust the timing uptil it goes away, then go back a further 2degs so that it doesnt come back just because its a hotter day.. Or you can just run higher octane fuel and set your timing higher till it pings, then come back till the pings gone, then go back couple more degs and you'll be fine

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Originally Posted by silver_screen

seeing its 200k then i suggest changing your timing belt too :D

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Yeah that was done recently.

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Originally Posted by yfin

Is that manual or auto? It is still early days so lets see what the next tank gets. The other thing is the car is being used for very short trips - eg to the train station just 1km away, to the local supermarket etc. Not ideal environment to get good figures. I have the Euro for more extended trips.

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Mine was manual :)

I find cleaning or replacing my spark plug/air filter & cleaning the points in the distributor cap improves economy, performance and idle quality.

points??? they dont have points champ... its electronic ignition

sorry wasn't to clear about what i meant, its the electrodes(not points) that hang down on the insides of the distributor cap (not the distributor) after a period of time it builds up some residue which impedes the spark coming from the rotor.

that is correct :)

I get about 400-450 klms per tank in my 89 ED hatch manual.
Mine doesnt ping or make any engine noice at all.
Take it to someone who knows how to tune them.