Lead Replacement Fuel

S

sibrown

New Forum User
I'm sure that this has been throught the wash on quite a few occasions - but does anyone have any definitive answer on whether using lead replacement is worth it on non catalytic Converted Cars. Got a late 260Z that seems fine on Green stuff - but worried by the long term effects (especially the new high Octane offerngs from BP).

Simon
 
One of the main effects of using unleaded fuel on an "leaded engine" is reported to be valve seat recession (one function of the lead was to protect the bronze valve seats) however depending on the age of your engine it is more than likely to have steel seats so will not be affected.

What age is the car, is the engine the original, what is the head casting number.

If you use the search function you will find many referances to LRP and that its use, gets the same response as sleeping with your dog ......you just dont do it, its ok for all those crusties driving Morris Minors or F*rd Anglias but no not in a sports car. If your worried, use fuel additives ... MRP do a nice well proven line
 
The late 260Z was listed specifically on NIssan posters as being O.K. to use unleaded petrol when it was first introduced, so no worries about valve seat recession. Bear in mind that it is a performance car and some benefit should be gained by using "Super" (or you favourite fuel company equivalent), especially if any tuning or head work has been done.
 
Datuns in the main that came to our shores where officially set to run 2 star fuel as a base, remeber this was leaded but it was short of octane, my Old mans garage held 5 star till early very eighties and most of our Z'd customers (and the Triple S owners) just popped round the back for a fill:cool:
some hot minis (owned by the mechanics) used to drink the stuff:bow: .

My Z is running Tescos high octane 97 ron (it's fuel of choice for the British Rally Cahmpionship with club card points toooo!!) boosted to 105 with Aldon Automotive home bread additive, i'm at around 20 deg advance, no worries, the high ron helps to keep the burn mix 'cool'.

A bit of additive every now and then won't hurt anything, down London way try Burton Power Products, I'm certain they carry Aldon booster or equivilent, you won't need it all the time, just helps for the likes of track days and those long hot summer nights when the right foot gets heavy, last thing you want to hear is any 'pinking' under load.

Other than that general 'motoring' with good oil (not synthetic) and water circulation shouldn't see you exposed to any nasties.

Enjoy

Nigel
 
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