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Posted

Who still runs leaded fuel? what additives are best to use with unleaded....as the nearest petrol station that sells leaded is a 20min run over the bypass for me...

 

how much does it cost to have a head converted to unleaded?

Posted

I've been running my XR2 on unleaded, the engine has been built 3 years now and got used hard (8500 rpm) on every occasion.

 

I removed the valves the other day and there is no sign of any wear.

 

If you do want tot convert it should cost no more than £100, its only 4 valve seats.

 

If you pay more than that you are being ripped off.

Posted
becareful,some hardend seat can fall out and wreck an engine. they used to in the 1.8 cvh. known one 1.6 pinto that happend to as well

 

Best to take it to someone that knows what they are doing :thumbsup:

 

There are a few cowboys out there :o

Posted
becareful,some hardend seat can fall out and wreck an engine. they used to in the 1.8 cvh. known one 1.6 pinto that happend to as well

 

Best to take it to someone that knows what they are doing :thumbsup:

 

There are a few cowboys out there :o

 

Dont matter who does it the still fall out,ford got it wrong with the big cvh.

They're worse on hard driven cars,the head expands faster than the seat and at 7000+rpm they move. can destroy an engine in the blink of an eye

Posted

My other half still runs on leaded, by us it varies between 98.9 ppl (Sainsbury's) to 149.9 ppl (Texaco or Q8 ) its ridiculus, but now where having to run on unleaded but any lead replacement additive should do the trick, but try and stick to one kind if you're going to use it!

 

Becki

Posted

My old mans sprint car runs on unleaded with an octane booster to lift it to about 102, no problems at all.

 

The big giveaway to a problem is the exhaust valve clearances closing up on a head without inserts

Posted
ive always used unleaded on non converted cars and not had a problem yet :thumbsup:

 

me too - if anything it runs slightly hotter but it did go faster which was a big thumbs up :thumbsup:

Posted

run mine on super unleaded (shell optimax) and a castrol additve with octane booster. using both ups the octain rating a fair bit over standard unleaded(95ron upto about 98-100ron) and the car goes really well. never have any problems. you may need to adjust the timing a bit but thats all. :thumbsup:

Posted

I use Redex lead additive. One bottle does 10 tanks (half a measure each tank) and if you go to a big Asda, they sell it at £3.80 a bottle (usually £5/6 a bottle from the motor factors/petrol station.)

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