Re: SER1 Unleaded petrol?

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I installed a 2 1/4 lit engine in my S1 over 20 years ago and at the time I 
changed the
valve seats and have had no problem with unleaded fuel. Set the timing 
around 0. Peter.
----- Original Message ----- 
From: "James Ferguson" <bounce@xxxxxx.xx.xx>
To: <series1@xxxxxxxxx.xxx>
Sent: Monday, January 09, 2006 1:16 PM
Subject: Re: SER1 Unleaded petrol?


> KC wrote:
>> I was under the impression that the side-valve engines (2L Series 1 and 
>> 2.6L
>> later vehicles) can run on unleaded fuel, but not the 2.25L engines. Is 
>> this
>> not correct?
>
> No.
>
> They will all _run_ just fine on unleaded fuel, but none of the above 
> mentioned have hardened valve seats, and therefore are likely to suffer 
> valve seat erosion with prolonged use of unleaded and/or high speed 
> running.
>
> I believe the V8 is the only engine fitted to Land-Rovers that can run on 
> unleaded fuel without deleterious effects. This is because the V8 has an 
> aluminium head and therefore had to be fitted with hardened valve seats 
> from new.
>
> This web site gives a great explanation of the principles of valve seat 
> erosion:
> http://www.pumaracing.co.uk/unlead01.htm
>
> James
> -- 
> http://www.ejames.co.uk
>
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