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Unleaded conversion
Posted: Sun Dec 11, 2011 9:12 pm
by beno9962
Does anyone know how much it would typically cost to have hardened valve seats installed on a 948cc head?
Also if I were to run on unleaded, would I have to adjust tappets, timings etc and is there a particular level of octane required for this engine?
Re: Unleaded conversion
Posted: Sun Dec 11, 2011 10:24 pm
by mike.perry
Normal practice is to exchange heads
Re: Unleaded conversion
Posted: Sun Dec 11, 2011 10:30 pm
by lambrettalad
Re: Unleaded conversion
Posted: Sun Dec 11, 2011 10:33 pm
by beero
I agree with BMC , unneccessary expense.
(Sorry, did I jump the gun? Has he not posted yet??)
Re: Unleaded conversion
Posted: Sun Dec 11, 2011 10:36 pm
by Alex'n'Ane
beero wrote:I agree with BMC , unneccessary expense.
(Sorry, did I jump the gun? Has he not posted yet??)
I thought it was a pretty unanimous agreement that if having to fit new valves, you may as well go for unleaded...? But untill it fails, leave it.
Re: Unleaded conversion
Posted: Sun Dec 11, 2011 10:39 pm
by beero
I suppose so, depends, I only had to renew the exhaust valves so in my case 4 new valves and a lot of lapping was a lot cheaper.
Re: Unleaded conversion
Posted: Sun Dec 11, 2011 11:20 pm
by bmcecosse
Exactly - don't bother! Set exhaust valve gaps at 15 thou and check/reset every 3000 miles. For a 948 - may as well keep an eye open for a later 998 Mini head - which is supposedly 'unleaded' - but in fact just has better quality exhaust valves - may as well have that head though - but don't pay more than a few pounds - sometimes 998 engines are given away free......
