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Valve Seat Recession
Hi,
I've reacently bought a cobra with a 1967 Ford 428ci. I'm assuming this will not work well on straight unleaded Lead Replacement Petrol (Available in UK still) or an additive with normal Ron 95 (95 Octane) unleaded. I guess it would need a higher Octane level than 95 but will it suffer from valve seat recession? Thanks for any help Paul |
Paul - I can't say for sure if your valve seats would be OK for unleaded. Has the engine been rebuilt at some time? I would guess so, and it would have likely received new valve seats at the time, which should be OK.
Untill you get a more definitive answer from the guys here, you could use Millers VSP, which is THE additive to use for engines which need leaded. Also gives an octane boost. Metaline - nice car. Where abouts are you in the UK? Edit: PS - don't bother with LRP - it's useless. |
Hi Wilf,
I'm actually using Castrol Valvemaster plus which is supposed to add 2 Octane as well as protecting the valves. I'ts also supposed to be compatible with LRP RON95 and RON97 (Optimax as well I guess) The engine has been re-built at least twice as far as I know. Once by Metaline in 87 - 89. A second time in 92 when a crane cam was added. I'm actually in Shepshed, which is near Loughborough, near Leicester, In the middle of England, near Europe, On the planet Earth... I guess I'll stop there :D Paul |
Don't worry about valve seat depression, your cobra motor won't be driven enough miles to matter.
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Guys,
Please be aware that Octane ratings in the UK and USA differ somewhat and are not directly comparable. Regards, Tony |
How do they figure the octane in the UK?
Here in the US they average the research octane and the mechanical octane. (R+M)/2 |
Paul - small world, Shepshed must be all of 5 miles from my abode in Rothley.
Email me via this forum, (look for the button around this post) we will get together. Also I will put you in touch with the East Midlands Cobra group which meets in Kirby Muxloe - again just down the road from you. A Metaline and a Crendon will add a touch of class to the group meets! Show up all those GDs. Would like to see the car anyway. Still think Millers is better than that Castrol stuff - BHVF did some tests some time ago, Millers came out tops. |
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