Bad Fuel Consumption Idea's?

[GRN_VAGN]

So ive been driving the bone stock 1.6L around,\
All it has is a better intake setup, and extractors with 1.5" exhaust.

Car runs great, small buck now and then on cruise throttle.. problem is fuel usage.. WOW!!

Ill put $10 in which is 7L and ill get 52kays on average of town driving, not revving past 3k and just driving normal.
have put $10 in 3 times and get just over 50kays to it.

Now thats 14L/100 kays..... my EB falcon does 13.1L/kays

Idea's what to check? i dont smell fuel, and exhaust isnt over smelly, just a little (it is 30+ years old)
Ive checked tank for leaks, pump, lines ect. cant see anything :S.

I have some new hose so i might replace it under hood, but it looks newish anyway. Filter is new.
Plugs and leads newish, new cap, rotor. Choke opens fully when warm. thats first thing i checked, it stuck on before and you can tell when it is.

[mikinoz]

How's the timing?

Are you basing this off a full tank. I'd suggest filling it and driving 200-300 km and then fill it again. Possibly it's in the measurements?

[GRN_VAGN]

not sure bout timing,
It doesnt ping, and i only run 91ron in her.
Car starts, runs, everything. feels great. doesnt feel that laggy for a 1.6L

Will fill it up on my next pay and see what happens. what should i expect from all town driving on stock engine? close to 400k id assume?

[dubmc]

it is also possible that the trip calculator is not accurate...

i always put $20 in which is about 15L if i'm lucky and sometimes i will do 30 kays and it says i'm empty and other times 90 kays ahah ... the car will also drive well well into the redline mark

also, as i drive up a hill the gauge will drop and then pick up again when going downhill...

i also think that because the price of fuel is so expensive, in sydney i've been paying $1.50 + and although i feel like i'm putting a lot of fuel in, i'm acutally not getting many liters for the money (obviously)...wouldn't it be good it fuel prices were 70c like when I was a kid...

[Jace]

If i stretch it out and drive like a nanna for a whole tank (really hard for me to do) then the best I can get is 385km/tank.

Haynes states the fuel tank is 40L. I've never pushed it real hard into the red but I always drive to empty and fill to full, then repeat. (bowser usually states 37L when i fill it so I could probably go a fair bit further based on the 40L capacity)

About 10L/100K. I give less of a **** about fuel prices and economy than most people I know, only reason I know what economy my POS gets is because I was probably heaps bored one week.

[GRN_VAGN]

If i stretch it out and drive like a nanna for a whole tank (really hard for me to do) then the best I can get is 385km/tank.

Haynes states the fuel tank is 40L. I've never pushed it real hard into the red but I always drive to empty and fill to full, then repeat. (bowser usually states 37L when i fill it so I could probably go a fair bit further based on the 40L capacity)

About 10L/100K. I give less of a **** about fuel prices and economy than most people I know, only reason I know what economy my POS gets is because I was probably heaps bored one week.

yeah its like that,

I reckon i probably have a ****y gauge. i double checked all hose clamps and what not today. Slapped $20 in today, which is 14L....
Will see what that gets me

Im not worried, its just a good weather driver,

[The_Hawk]

The only way to test is to fill it up to the first or second click, note the odometer reading, drive till it's less than 1/4 of a tank and then refill, even better if it's the same pump at the same station, again to the same first or second click and note the new odometer reading...

Calculate.

repeat.

[sports racer]

You may have the mixture a bit rich.

There used to be a clear spark plug you could buy that let you see the fuel mixture as you revved the engine. Clear was the best setting and you tuned the mixture screws on the carbie to get that colour.

There is a way to check the mixture without this special spark plug. Drive on a flat bit of road at a steady 100 k's for at least a minute without accelerating/decelerating. Knock it into neutral, turn the engine off immediately and pull over to the side of the road. You can't coast to a stop with the engine running as that changes the outcome.

Take out one of the spark plugs and have a look at the colour of the ceramic around the spark tip. If it's a slight shade of blue then the mixture is lean. If it's sooty/black it's running too rich. If it's white you've got the mixture set up pretty well.

Another way is to roll down a steep hill with the engine in gear (preferably top gear) but take your foot off the throttle. If it backfires then it's running a bit lean. I used to setup my carbied cars so I get just the hint of backfire.

Hope this helps.

Cheers

Paul

[GRN_VAGN]

Cheers Paul,

Plugs seem great, at idle, and when i coast it to a stop.
I think the carby is just shot, seems to be fuel around the throttle shaft. from what i read its a common thing with solex carbs.

[sports racer]

That must be a massive leak. My Aussie spec MK2 GTI (90hp) was getting between 5.9 and 6.3 litres per 100 k on the open road with a little bit of town driving. Best I got out of a tank was 830 ks and I could have got more but where I live it's 50 ks between petrol stations and I didn't want to try for 880 ks.

[GRN_VAGN]

That must be a massive leak. My Aussie spec MK2 GTI (90hp) was getting between 5.9 and 6.3 litres per 100 k on the open road with a little bit of town driving. Best I got out of a tank was 830 ks and I could have got more but where I live it's 50 ks between petrol stations and I didn't want to try for 880 ks.

yeah seems it
Going to my hand on rebuilding a solex carb, ive found replacement bushes for the throttle shaft which should fix 95% of any leak ect.. which is great. i dunno yet. leak cant be massive, cause i can spray wd40 around the area and the revs dont change.