|
|
Post by seancornwall on Jul 23, 2014 7:54:08 GMT 1
Hi guys, as you may know I've got a 910 bluebird, it's a 1.8 and has a single carb.
Due to various reasons (mainly my motorbike shedding it's engine internals all over the A30) I've been driving the bluebird a fair bit lately and I've worked out that my average fuel consumption is about 27.5mpg - is that about right for this type of car? I only worked it out because of how much extra it's costing me a week (£45 instead of £9 on the bike) and was just curious as to what to expect.
I've not stripped and cleaned the carb as yet so that may improve it slightly. Those figures do include a run once a week of about 80 miles each way at 80mph-ish.
|
|
|
|
Post by Al Ramone on Jul 23, 2014 16:01:57 GMT 1
yeah sounds right. i drove my 810 estate a bit slower then you and was getting 30-33mpg in normal use. that had a 5 speed.
|
|
|
|
Post by Talking Hoarse on Jul 23, 2014 20:37:26 GMT 1
Hi Sean
Sorry about the bike.
Your car & fuel consumption sounds OK - ie what you can expect. They had a reputation for being thirsty, even though they had a twin choke carb. Mine probably does about the same as yours around the doors, but on a run will do (an astonishing?) 40ish mpg although I don't do much more than a real 70mph for very long (the speedo is a bit optimistic on mine).
Presume the spark plugs show the right sort of colour, else tweak the mix screw (the sniff at the MOT test would give a good clue too), and ensure that the auto choke is opening up properly when hot.
You could always try advancing the timing a little..... The book setting of 10 degrees BTDC was for 2 star fuel, whereas unleaded today is 3½ star approx equivalent. My car is happy at about 12 or 13 degrees advance - although I recall that Will suggested 15 (and he of all people will know from experience). Other tweaks might be
- making sure it gets up to temp, has the right rad cap on (cant remember psi)
- blow the tyres up a bit harder - I have used 40psi in my tyres although the baggy suspension doesnt respond so well to that
- put off fitting those 205 etc wide tyres and stick with 165/175/185 width ....
Ed
|
|
|
|
Post by reallyloud on Jul 24, 2014 0:32:53 GMT 1
My 610 180B is returning around 25-28mpg on long runs and maybe around low 30's around town. As Ed mentioned, 40mpg should be achievable on the 910 though - I recall my 1.6 910 being quite good as there's not much in it between the L16 and L18. Perhaps check the rear drums to make sure there's no drag and check the transmission fluid and investigate there's no exhaust or fuel leak too. I found a basic service (20W50 oil/coolant/plugs+leads+cap/air filter) made a marginal difference.
|
|
30psi
club Member
Posts: 166
|
Post by 30psi on Jul 24, 2014 12:24:22 GMT 1
My 910 was crap on fuel. 25mpg whether I thrashed it or drove it like a girl. That was an auto without overdrive. Comparing it to my Thunderbird where the engine is 4 times the size and that gets 18mpg on a run, not sure how Datsun managed to make it so bad!
Suspecting the fuelling was rich I put a wide band on it and discovered it was text book spot on. So just figured the engine isn't efficient. Changing the engine over to SR20 has helped on that though.
I think you'll manage it to get it to the low 30's but 40mpg will be hard work.
|
|
bananahamuck
Full Member
Posts: 286 
Location: Littlerock Washington USA
|
Post by bananahamuck on Jul 27, 2014 8:06:53 GMT 1
You guys are getting far better fuel mileage than me,, i believe i get about 24 mpg with my 71 510 with 1600 high overdrive ZX 5speed with tall 185/70/14 tires and that is driving 60 mph.. I wonder if our gas mixtures are different enough to cause this,, do you guys have ethanol added to your gasoline? We have a minimum of 10% added to ours.
|
|
|
|
Post by gainsb1 on Jul 27, 2014 8:31:29 GMT 1
You guys are getting far better fuel mileage than me,
... I believe that your gallons are smaller than our gallons, so your mpg will look better to us. 
Leigh (Area rep) |
|
bananahamuck
Full Member
Posts: 286
Location: Littlerock Washington USA
|
Post by bananahamuck on Jul 27, 2014 8:47:12 GMT 1
Oh,, i forgot about that.  |
|
|
|
Post by gainsb1 on Jul 27, 2014 21:27:48 GMT 1
For those who want to know;
One Imperial gallon equates to 1.20094992550 US liquid gallons. Thus your MPG is a rather nice 33.02612295125 (give or take a digit.) Happier now? 
Leigh (Area rep)
|
|
bananahamuck
Full Member
Posts: 286
Location: Littlerock Washington USA
|
Post by bananahamuck on Jul 29, 2014 21:13:07 GMT 1
I am so cheap if i got 100 mpg i would still be looking into leaning out the carb some. One ray of sunshine gas prices local to me dropped 15 cents over the weekend so buying super (93 octane) is the same price as regular last week.
|
|
|
|
Post by gainsb1 on Aug 7, 2014 22:06:43 GMT 1
Go on then..... you can't leave us like this. How much do you pay for a US liquid gallon? I'll try to do the conversions (US to Imperial and $ to £) and let you see how much we pay for the equivalent amount.
Leigh (Area rep)
|
|
bananahamuck
Full Member
Posts: 286
Location: Littlerock Washington USA
|
Post by bananahamuck on Aug 11, 2014 18:39:19 GMT 1
Sorry i didn't get back earlier but we went on a tiny road trip,, but that did give me more examples to throw in. Gas prices about 5 miles from here by the freeway are $3.73 per gallon . We were in Eastern part of state this weekend where the cost of living is much, much lower and we payed as little as $3.60 for a gallon once,, but we shopped around as we have fairly economical cars. Average was 3 cents higher. _____________________< If you wanna really be PO-ed at what your paying check out the price per gallon in Wyoming USA. link www.wyominggasprices.com/Cheyenne/index.aspxAlthough the goverment probably keep prices that low there to keep all the residents from getting in a giant bus driving off a cliff. |
|
