pre ignition/ running on

[bigdaz27]

my escort is runing on after switching the ignition of. do i advance or reterd the ignion timing to sort it as its geting on my tits now its a pinto engine witch has only done 1600miles

[Retro-gone.]

wants retarding but 1st what fuel you using and have you had the head unleaded conversion?

[bigdaz27]

im using 95 ron unleaded and millers lead substitute and octain boster its a 2.1 pinto no the head hasnt been converted the enginer who did my head said he couldnt cos the valves where to big

[Retro-gone.]

id try retarding it a little at a time then.

[bigdaz27]

ok ive got the ignition set at 12 degres static at the mo will have a play later

[Toby]

What spark plug are you running? A colder plug may help too. Retarding the ignition should help, and certainly a 97 fuel would be better esp. if you you have the "biggest" valves. From this statement I would assume the head is fairly racey with high compression, running a cheap fuel in the long term may damage the engine if you end up in a detonation situation.

 

Safety 1st.

 

Safe Plugs, safe fuel, safe ignition.

[bigdaz27]

it runing 38.1mm ex valves 44.5mm in valves its been gas flowed and im using fr33 cam and 93mm cast pinto pistons not v6 pistons the bottom end has been balanced and the fly wheel lightend and im usung a felpro head gasket and a 38dgas carb i set the timing to 12digres and alll seams ok but still unsure about the fuel i should use 95ron 97ron or 99ron ?

[Toby]

You want the best ron fuel to suit the best ignition settings and performance, this, I would have thought, would be 99 in your case. With an NGK plug rated around a 7 in the heat range. If you can't get the plug you need HT racing do a spark plug adapter that open up your options by enabling you use use motor bike spark plugs.

 

Start with the ignition....that wont cost anything long term put some good fuel / plugs in it.

[Rick]

i have the same happen with my crossflow but only on long journeys where iv thraped it. Also has a bit of trouble starting sometimes like the fuel has sucked back up the lines.

 

messing with the timing didnt help me much though