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good fuel
Posted: Sun Sep 20, 2009 1:47 pm
by sam011
i am about to start running my 3.4 s-type after an 8 year lay up. As this was pre-unleaded fuel days i am interested to know the best unleaded fuel/un leaded fuel+addative to start with.
many thanks for any help
dave
Posted: Sun Sep 20, 2009 10:47 pm
by sweller
What fuel? The cheapest....
My understanding is it's fine for it to run on unleaded - I use 95 RON in my 3.8s
It has an aluminium head - already has hardened valve seats so valve seat recession isn't a problem. Mine doesn't suffer from detonation on the UL95.
Simon
good fuel
Posted: Mon Sep 21, 2009 6:47 pm
by sam011
thanks for your help simon i will have a go.
Posted: Mon Sep 21, 2009 7:38 pm
by stuarthardy
I agree with Simon. I run my 420 Sovereign on either 95 or 98 unleaded, without additives. Either seems fine. Compression ratio is 9:1.
When I use 98 octane, the car's fuel economy (?) improves about enough to justify the extra.
Regards
Stuart
fuel
Posted: Tue Sep 22, 2009 6:41 pm
by sam011
thanks stuart, thats even better the 98 oct improves the economy.
Posted: Tue Sep 22, 2009 8:31 pm
by stuarthardy
Dave
When I said improved economy I didn't mean drastically, but 5% or so is worth having, especially at 18 or 19 to the gallon!