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CC Advertisers
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01-21-2004, 06:18 AM
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CC Member
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Join Date: Jan 2004
Location: Leicester,
UK
Cobra Make, Engine: Metaline 1969 Ford 390 bored to 402ci
Posts: 89
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Not Ranked
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
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01-21-2004, 06:26 AM
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CC Member
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Join Date: May 2000
Location: Leicester,
UK
Cobra Make, Engine: Crendon, windsor 408 stroker, tremec. Also GSX008
Posts: 1,406
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Not Ranked
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.
__________________
Wilf
Last edited by wilf leek; 01-21-2004 at 06:32 AM..
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01-21-2004, 07:18 AM
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CC Member
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Join Date: Jan 2004
Location: Leicester,
UK
Cobra Make, Engine: Metaline 1969 Ford 390 bored to 402ci
Posts: 89
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Not Ranked
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 
Paul |
01-21-2004, 08:08 AM
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CC Member
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Join Date: Mar 2002
Location: so cal,
Cal
Cobra Make, Engine: I used to fix them for a living
Posts: 2,563
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Not Ranked
Don't worry about valve seat depression, your cobra motor won't be driven enough miles to matter.
__________________
In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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01-21-2004, 08:18 AM
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CC Member
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Join Date: May 2001
Location: Birmingham UK,
UK
Cobra Make, Engine: AK Cobra, Jag based Lexus 1UZFE Engine and box
Posts: 80
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Not Ranked
Guys,
Please be aware that Octane ratings in the UK and USA differ somewhat and are not directly comparable.
Regards,
Tony
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01-21-2004, 08:40 AM
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CC Member
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Join Date: Mar 2002
Location: so cal,
Cal
Cobra Make, Engine: I used to fix them for a living
Posts: 2,563
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Not Ranked
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
__________________
In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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01-21-2004, 10:42 AM
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CC Member
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Join Date: May 2000
Location: Leicester,
UK
Cobra Make, Engine: Crendon, windsor 408 stroker, tremec. Also GSX008
Posts: 1,406
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Not Ranked
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.
__________________
Wilf
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