Old schoolers only>>>

[vhpacer]

Is there any advantages with using those lead replacement pills in old cars? Ive just been running my valiant on 95 or 98 and it goes fine. But I wondered if it would like some lead??? Would it make any difference in running better/smoother?? The motor hasnt been modded to run on unleaded
Thanks

[monkey_boy]

cant remember exactly what it does but i had to run it in my mini to stop it F**king the valves or something like that.

could go either way tho...

[Ae92typeX]

prevents valve seat recession/vsr since the introduction of lead free petrol.
Basically, older cars dont have a solid insert into their heads- the valves just go straight into the cast head. Through high temp/ non lubed running without lead the valves can stick/microweld which causes them to recess into the head more. This can damage the head beyond repair, cause leaking and sticking valves/burnt valves etc
All alloy head cars have inserts, but on older models many are still not solid enough to prevent vsr
When you mod them to run on unleaded they put a solid insert into the head to stop this happening.
Ive seen quite afew old 4's which have suffered badly from vsr, not many bigger lower reving old engines though (6's & 8's).
In all the cars Ive run with valve addiditive Ive found no noticable running difference, but have taken off the head on several and seen no noticable wear in ones running it.
Theres quite afew different options on the market, valvemaster being one of the more expensive options.
In this mini I have now Ive been running moreys upper cylinder lubricant. Had the head off a while ago and the valves were still mint, un carboned and non recessed. ~$20 a bottle and treats 650L of fuel.

[Ae92typeX]

Ive got afew articles on it, but dont have a scanner at the moment, so heres some useful links which talk a bit about it more nicely than me (top pdf one being the best probably):

http://algoa.sportscarclub.co.za/images ... %20doc.pdf

http://www.repairfaq.org/filipg/AUTO/F_Gasoline8.html

http://www.mgb-stuff.org.uk/lead_replacement.htm