B16A1 - Which Fuel? 95/98?

[gumus89]

The question still stands...
How does the fuel make the valvetrain more/less lubricated?

[Fredoops]

The question still stands...
How does the fuel make the valvetrain more/less lubricated?

That poster may have LRP, PULP and racing fuel mixed up, but you can't blame him, till a few years back, LRP was PULP.

The old leaded fuels, and engine that uses them, the lead was a lubricating agent for valve stems I remembered.

Back in the day Mobil servo used to sell a lead replacement fuel (which they also sell as PULP) which contains lubricating agents in place of lead, dunno if they still sell them however. I think a lot of refineries just incorporated the LRP into the PULP they sell, if they say their PULP was safe for pre 1986 cars, chances are it's a LRP pulp containing lubricating additives.

In fact I'm pretty sure most of the racing fuels (eg Optimax 105 or something, used to be sold near eastern creek) still contains lubricity improvers (EDIT: BP ultimate has "friction reducers"... Essentially the same thing). Also I remembered at lease one premium fuel that advertised to contain lubricity agents when I was ore in Europe (but it could be premium diesel,I can't recall)


Or... It could just be that PULP burns cleaner and leave less residue behind compared to cheaper fuel. For example, BP ultimate has 70% less sulphur content of regular petrol and BP 95 octane, and sulphur is a known corrosive agent... And a health hazard. OR... The fact those PULP contains cleaning agents that removes valve deposits...

[chauster]

I fill 91 in my ek1.
98/95/91/e85/e10 fuel is fuel, it makes my car go. The cheaper the better.

OH thats cause the car is a daily and i dont drive it like a bawsss
=D

my2c

[gumus89]

And so you shouldnt worry. The effect of the fuel will be negligible compared to the other shit that can destroy a car.

[trism]

That poster may have LRP, PULP and racing fuel mixed up, but you can't blame him, till a few years back, LRP was PULP.

The old leaded fuels, and engine that uses them, the lead was a lubricating agent for valve stems I remembered.

Back in the day Mobil servo used to sell a lead replacement fuel (which they also sell as PULP) which contains lubricating agents in place of lead, dunno if they still sell them however. I think a lot of refineries just incorporated the LRP into the PULP they sell, if they say their PULP was safe for pre 1986 cars, chances are it's a LRP pulp containing lubricating additives.

In fact I'm pretty sure most of the racing fuels (eg Optimax 105 or something, used to be sold near eastern creek) still contains lubricity improvers (EDIT: BP ultimate has "friction reducers"... Essentially the same thing). Also I remembered at lease one premium fuel that advertised to contain lubricity agents when I was ore in Europe (but it could be premium diesel,I can't recall)


Or... It could just be that PULP burns cleaner and leave less residue behind compared to cheaper fuel. For example, BP ultimate has 70% less sulphur content of regular petrol and BP 95 octane, and sulphur is a known corrosive agent... And a health hazard. OR... The fact those PULP contains cleaning agents that removes valve deposits...

nothing in this post answeres teh question.

How is it that fuel, which goes in the inlet manifold, through the ports, into the combustion chamber, then back out through the exhaust port, can have any effect at all on the valve train, which is cams/springs/retainers/rockers/guides/seals etc etc when it is isolated totally from the fuel entering.

You might say "oh, because the valve stem is in the path of the incoming air/fuel charge, and it transports it back up, but it doesnt, because the job of the valve stem seal is to prevent this.

Leaded fuel, and lead replacement fuel, and now, additives for leaded cars did not have an effect on the valve train.

It helped to lubricate the valve seats, which were made of a softer material. So now, if you want to run unleaded in a car designed for leaded you either have to
a: get hardened valve seats fitted; or
b: use an additive, lest your valve seats will get destroyed over time.