Unleaded head conversion.

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Unleaded head conversion.

Post  john&gina on Fri May 10, 2013 2:00 pm

After burning out an exhaust valve on the way to Brooklands, have taken the plunge and had the cyl. head modified.
Very pleased with the result. Thurston engineering of Stondon Massey in Essex did the business for me. They replaced 4 exhaust valves and
hardened seats plus 1 inlet seat. Plus a set of new valve springs.
Happy motoring to all,
John & Gina.

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UNLEADED HEAD CONVERSION :

Post  David2010 on Fri May 10, 2013 11:58 pm


As my 998 Mini Cooper is about to undergo similar surgery....
That is Head off - (Poor compression on No.3 & No.4 cylinders )- almost certain that valve replacement &/or valve seat work needed.
They say that comparisons can be odious - but would really love to know what you were charged by Thurston Engineering ?
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Head repair

Post  john&gina on Sun May 12, 2013 12:07 am

Hi, Thurston engineering charged me £315 +vat for all the work and included the head set. I think this was a trade price they gave me.

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Head Repair :

Post  David2010 on Mon May 13, 2013 1:51 am


My quote for head off / new gasket / head on again = 140 Euro = 119 Pounds. All extras (e.g.Valves / Valve Springs / Guides are extra).
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Head repair

Post  john&gina on Mon May 13, 2013 1:25 pm

Thurstons price included 5 valves 5 seats all springs and gaskets. A friend did the work and changed a drive shaft coupling and sorted out a few oil leaks which came to £200.
Pleased I had it done as 'titch' is running well and even the heater is working.

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Re: Unleaded head conversion.

Post  asahartz on Thu May 16, 2013 11:01 pm

Swapping a head is something I do in a day. I've not yet had need to have one converted (and my cars do 50 miles a day, every day, on plain unleaded). I have a couple of spare heads in the shed, but when the day does come, I have a nephew who specialises in doing cylinder heads! Very Happy

My 1275 Sky is having the head off soon - it's been overheating since a recent motorway blast; I think the gasket blew - it will be interesting to see what condition it's like inside.
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Re: Unleaded head conversion.

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