lrp in an unleaded?

[sierra3dr]

The previous owner to my Cortina had told me that the cylinder head has been converted for unleaded use. As I have been driving from home to unit in the Cortina,it runs really bad,starts to judder when slowing down in each gear. Apart from that,when accelerating,it does ping. As I drive the Cortina to my unit,my intentions have been,to dial in the 285 piper camshaft,but my attempt to make a piston stop from an old spark plug has been unsuccessful. Having presented the issues with the engine before I ask,can lrp be used on a cylinder head for unleaded(if it is,not sure) use?

[Richard Moss]

If the head had been converted to unleaded then it should suit any type of petrol

[Grease Monkey]

Use a good quality 'Super Unleaded' petrol, most normal unleaded is rubbish!!



John.

[sierra3dr]

If the head had been converted to unleaded then it should suit any type of petrol

True,but there's a possibility that it may not have been. The pinging maybe down to a bad ignition system,I think the motorcraft dizzy has had it's day

[Richard Moss]

LRP should also be OK on an unconverted head. Pinking is most likely down to a weak mixture or incorrect ignition timing.