Twin Cam Unleaded Running

[pmallinson]

Hi

I'm sure this has proabably been covered before but just for my own peace of mind.

Do Twin Cam engines have the hardened valve seats that will run on unleaded petrol ?? ( Mine is a 1973 Big Valve unit engine number P31055)
I'm being given conflicting information from some of my friends 'In The Know' some say Aye others Nay !

On previous classics I have had I have used Millers VSP to great effect and had no problems with valve seat regression even after in execess of 20 K miles !! I have also used Castrol Valvemaster and found it to be offer good car performance over many miles but as yet not stripped for re-examination.

So what's the general feeling in the Lotus fraterinty ??

Cheers

Peter M

[triumphelan]

Check the archives there is shed loads on this .Our friends across the pond ,have not had 4* for many years and they all run on lead free .I run my s4 on Shell Optimax I do not use any additives and have for the past 3years ,I check the valve clearances every year and have found no increases

[ppnelan]

Peter,

The most recent discussion was:
www.lotuselan.net/forums/viewtopic.php? ... ght=#53392

Matthew

[gwnorth68]

In the immortal words of Lotus enthusiast Alfred E Neuman: What, me worry?

[twincamman]

might add a little Guinness in the tank to cushion the valves ed

[stuartgb100]

Quote:

"might add a little Guinness in the tank to cushion the valves ed"

Strewth, what a waste.

Why not try Bud Lite instead. or the original "high octane" Budweiser.

Hear tell our american friends have been used to weak beer and petrol for decades, so thought they'd take better care of our Guiness. (vbg)!

Then again, if it's to take care of an elan .........

Regards,

Stuart.

[twincamman]

I use some very cold Molson Canadian ---racer strength--- --ed