Unleaded Conversion

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SmartArt
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Unleaded Conversion

Post by SmartArt » Mon Nov 06, 2017 1:46 pm

Sometime next year I want to convert my GTC 2.8 Cologne heads to hardened valve seats so that I can dispense with the additive. I am in the Chelmsford area of Essex and wonder if anyone locally has had this work done and can recommend a quality motor engineering company to do the work for me. I am also wondering about the relative merits of getting the heads off myself and taking them to whoever does the job for me and then re-installing compared to taking the car in and letting them do the lot. I have always tried to keep my Scimitar GTC as originally supplied so opinions are also welcomed as to whether or not I should even think of updating the heads?



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mn757
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Unleaded Conversion

Post by mn757 » Mon Nov 06, 2017 3:50 pm

Personally I wouldn't bother until you have to have the heads removed for another reason. I wouldn't bother with the additive either, it's not a high revving engine which I think is where the bulk of valve seat recession occurs. I realise the 2.8 has a low rear axle ratio than the Essex engined cars, but even so I'd imagine you'd do many miles before you *might* have an issue.

I DID have unleaded seats fitted by a seemingly well respected Essex specialist in the West Midlands area in 2009, I had to go back twice, once when the valve seat came loose and was rotating in it's recess (odd tapping noise) , the second time because another valve seat fell out and shattered, taking out a bore / piston with it. The second time involved being towed home from France on the back of a RAC truck.

Just my opinion.


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Nick
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Unleaded Conversion

Post by Nick » Mon Nov 06, 2017 4:06 pm

I agree with mn. I would not bother until you identify a problem with the existing heads.

There are risks with fitting hardened seats.


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Unleaded Conversion

Post by peter freeman » Mon Nov 06, 2017 4:16 pm

And I agree with both of them - my 5A when I sold it had done 205,000 miles with unleaded heads - 130,000 of those done by me.



SmartArt
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Unleaded Conversion

Post by SmartArt » Wed Nov 08, 2017 12:10 am

Thanks for the input guys. It certainly helps to get comments like this and puts the proposed project more into perspective; perhaps I will spend the money on other jobs which are in the pipeline such as a new soft-top, front carpets and refurbishing the hard-top. The car is almost 33 years old and has only done 77,000 plus miles since I bought it new in January 1985 so it looks as if there is still plenty of road to eat up yet.



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