Octane Booster
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An old racer.........
New member
While in the area of this subject, does anyone have an opinion on valve seats, should std ones be changed, if so, any ideas on a competent shop to do the job? Kent / Sussex area if poss.
Mervyn
Mervyn
cortina-mk1
New member
you only need to use higher octane in your car
if the comp ratio has changed
and is higher
wasting your money otherwise
if your comp ratio is standard but have a bit more timing in the car
then maybe a higher octane at the pump (premium)
but unless your running 11:1 or more no need
if the comp ratio has changed
and is higher
wasting your money otherwise
if your comp ratio is standard but have a bit more timing in the car
then maybe a higher octane at the pump (premium)
but unless your running 11:1 or more no need
If we are just talking about the octane rating's (and not anything else these additives can contain), then they can also be very useful to keep a bottle in case you are stuck somewhere you can only get lower octance fuel, to bring back up to the equivelent of 5 star.
After doing the sums I found I'd get better mpg using shell optimax 98-99 (now V-power), in fact it was enough of a difference to make up for the higher pump price.
After doing the sums I found I'd get better mpg using shell optimax 98-99 (now V-power), in fact it was enough of a difference to make up for the higher pump price.
cortina-mk1
New member
if the car pings on regular fuel
then i would look at other means
then i would look at other means
Hi Will,
No different thing.
Basically the car's from new were set up to run on 5 star (which is 100-101)
In layman's terms the octane number is how easy it is for the fuel to ignite.
From my experience using modern fuels in a twink...
98-99 (optimax/v-power/good super unleaded) Good for road use, worth a drop of octance booster for track days/motorsport to bring up back up to 100
97 (super unleaded) okay for road use
95 (normal/regular uk) okay for occasional fill-ups, i'd perfer to add octance booster to bring that figure up.
under 95 (not taken the LC to eastern europe yet)...Rather be towed to the next fuel station!
Cheers
Louis
P.S All recommendations depend on your current engine tune, timing, etc,etc
No different thing.
Basically the car's from new were set up to run on 5 star (which is 100-101)
In layman's terms the octane number is how easy it is for the fuel to ignite.
From my experience using modern fuels in a twink...
98-99 (optimax/v-power/good super unleaded) Good for road use, worth a drop of octance booster for track days/motorsport to bring up back up to 100
97 (super unleaded) okay for road use
95 (normal/regular uk) okay for occasional fill-ups, i'd perfer to add octance booster to bring that figure up.
under 95 (not taken the LC to eastern europe yet)...Rather be towed to the next fuel station!
Cheers
Louis
P.S All recommendations depend on your current engine tune, timing, etc,etc
cortina-mk1
New member
sorry regular ULP is about 91 i think
then there is a 95 ULP
and a 98 premuim ULP
will be much the same as what you have
and will, if your head has been converted to run on
unleaded it only means it has hardened valve inserts
because there is no lead in fuel now to lubricate the valve seats
then there is a 95 ULP
and a 98 premuim ULP
will be much the same as what you have
and will, if your head has been converted to run on
unleaded it only means it has hardened valve inserts
because there is no lead in fuel now to lubricate the valve seats
Was that at or near a track?
cheers
Louis
P.S Anyone who dos'ent need to worry about running a fuel without tax on it. ie race cars etc. Should get in touch with there local avaition fuel supplier, the choice of 100 plus rated leaded and unleaded fuels is staggering and much cheaper than race fuel and often cheaper than pump fuel. :roll:
cheers
Louis
P.S Anyone who dos'ent need to worry about running a fuel without tax on it. ie race cars etc. Should get in touch with there local avaition fuel supplier, the choice of 100 plus rated leaded and unleaded fuels is staggering and much cheaper than race fuel and often cheaper than pump fuel. :roll:
An old racer.........
New member
I was running a single seater with 11-1 compression V8 running on avgas circa 1995-98 but, I was told it did NOT contain lead, & all piston engined vintage aircraft have to be modified the same as cars......
One supply was Biggin Hill the other at Headcorn Kent, cost (then) about half as much again to buy though.
I will check it out in case things have changed since, & let you know.
Cheers
Mervyn
One supply was Biggin Hill the other at Headcorn Kent, cost (then) about half as much again to buy though.
I will check it out in case things have changed since, & let you know.
Cheers
Mervyn
cortina-mk1
New member
avgas well here in australia does contain lead as old 50s built planes new nothing about unleaded in those
and still dont
and still dont