LuckyWelshchap

I wonder if the petrol companies will follow airlines and start 'Frequent Filler' programmes?

domino46

The mrs loves it since I swapped over to tesco momentum as the club card point have gone up loads

LuckyWelshchap

That's a good point, I hadn't thought of that.

Now I realise why she's getting me to take her to work.

iain85

Is that true about there stil being 10 litres left when the fuel light comes on? Mine is halfway between the last notch and empty and still no light, I was worried about making it to a fuel station!

Also, would it harm my car if I used regular fuel as a back up? I was wondering what I'd do if I,was running low with no premium fuel about. Car is standard wrx 04

Turbotits

iTrader: (2)

Would be fine with regular in if thats all was available. Ive had mine right down to fuel light on and never got more than 50 litres in. (60 litre tank) the bigger problem is fuel surge even at 1/4 of a tank

iain85

That's good to know cheers, what is the reason they need premium fuel normally? Also what is fuel surge? / I'm learning

domino46

Fuel surge is when the fuel is low leaving a lot of spare room n the tank so when you corner the fuel that's left will slosh over to the side away from the fuel pump pick up starving it and the engine of fuel and this can cause your engine damage

LuckyWelshchap

Premium fuel burns more efficiently but more importantly combusts in a more controllable manner which prevents 'det', premature detonation ie it explodes too early thereby throwing the cycle of pistons out of sync, placing too much strain on components and basically destroying the engine.

Although not the same, nor necessarily the same result, a little like if the cambelt goes, the cylinders fire incorrectly, in the wrong order and that's the engine's lot.

iain85

Cheers bet not run it to low then!

With regard to the premium fuel, it sounds like real bad news then to use regular unleaded. Will it be safer bearing in mind mine is standard? Don't want to damage my baby!

Turbotits

iTrader: (2)

Certainly premium would be my prefered choice. But on a standard newage uk car,driven in a reasonable manor. Its unlikely that the odd bit of regular will cause any damage

iain85

Cool. I can relax then!

ditchmyster

iTrader: (7)

If you HAVE to use regular keep it off boost, ie don't drive it hard 3k rpm max, only put enough in to get you to a shell or tesco and brim it with the expensive stuff.

Avoid BP stations subarus don't like it.

There has been a lot of debate about which fuels they will run on, as it's a maf based system it WILL run on 95 ron but it's really not recommended that you do unless you absolutely have to, you could also buy a bottle of NF octane booster and carry that in the boot for emergencies.

Sami_D

iTrader: (1)

£75 = 301 miles for me this weekend!

Sami_D

iTrader: (1)

£75 = 301 miles for me this weekend!

300gnspitzer

When detonation occurs the combustion temperature is too high, hence melted pistons, absolutely nothing to do with pistons running out of sync. after all they're still connected to the same crank journals.

300gnspitzer

If the cambelt goes the engine stops, the cylinders don't fire incorrectly, they don't fire at all, they never will if the camshafts aren't turning.

iain85

So the Mrs put 20 quid of e regular in which is only quarter of a notch. If I now fill it with vpower will I be able to use as intended? Or am I best chucking some octane booster in?

Turbotits

iTrader: (2)

Fill with v power or momentem. It will be fine. Theres lots of scaremongering about fuel. On a standard uk wrx it will be fine

iain85

Cheers will do tomorrow

LuckyWelshchap

Slightly disagree there.

When det occurs the result is that pistons can get melted ie not perform as a team as they should.
Not all pistons - some of them.

That means that the standard cycle ie. 1 does compression, 1 does ignition, 1 does induction and 1 does exhaust is not synchronised, because one of the four is er...basically foo-bahed.

That results in the operation of the crank being NOT what was intended by the manufacturer, and hence the entire process of producing spec'd power um.... not as was intended.

300gnspitzer

The pistons are not buddies in a team, they're pieces of metal and unless the cambelt breaks the standard four stroke cycle for each cylinder, induction, compression, power, exhaust is set, forever, it cannot become unsynchronised.

domino46

If you get pre det then the det is going to be pushing the piston back down when its still trying to come up putting to much strain on the rods crank and bearings

poopipe

Yeah right. My ra seems to have a 42 litre tank and im happy if I see more than 160 miles out of it

LuckyWelshchap

Said it for me

The other thing is that (eg the cambelt breaks) residual processes such as crank still turning, pistons still going up and down, other pistons continuing their cycle will throw the whole timing sequence out. Each cylinder will be stuck in whatever stroke it was on but the piston won't be sync'd to it.

Anyway, I now know I can get 250 miles to the tank.

I once got 400 out of my Catalunya, back and forth the M50/M5/M6 to the Lake District, in a tranquil mood each way.