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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars

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conversion to unleaded petrol

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Old Apr 4th, 2021, 19:43   #21
morwenna240
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Last Online: Mar 23rd, 2024 20:59
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Originally Posted by 142 Guy View Post
It will depend on how much you drive the car. With conventional valve seats, the TEL (lead) in the gasoline acted as a wear reduction agent. Wear wasn't much of an issue on the intakes; but, it is an issue on the exhausts. With conventional valve seats and no TEL in the gas, the seats will wear allowing the valves to recede into the head also causing the clearances between the tappet to reduce and loss of spring pressure.

If you don't drive the car a lot, the rate of recession of the exhaust valve will be small and you may never have to address the problem. In the ancient days of pre TEL gasoline and unhardened seats, people just lived with this problem. If you drive the car a lot, then you may find out how quickly it becomes a problem. Don't ask me how many miles it takes for recession to become a problem with unhardened seats because I have never tested this.

My cost experience is a bit dated; but the £300 quoted by Burdekin seems extreme for just installing and cutting 4 exhaust seats. That is about 5 times the additional cost I paid for hardened seats - although my work was carried out at the same time as I was having general head work done. If I had gone in to the shop and said ' just the seats please' the cost would most certainly be higher. Based upon my incremental cost it was not a hard decision to make for me. £300 would be a slightly harder pill to swallow.
Car will be everyday driver in the warmer 6 months, the rest in the 145. (suppose better have them done, too. Shucks) Thanks for all the info, you lot.
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