what could do this to the valve?
11-15-2013, 07:43 PM
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what could do this to the valve?
Took apart a head I purchased and trying to find out whats going on here with 2 of the exhaust valves
11-16-2013, 12:26 AM
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Re: what could do this to the valve?
My guess was detonation from to much exhaust heat and the valves were switched around, these are rev xvt valves if that helps any1
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11-16-2013, 05:34 AM
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Re: what could do this to the valve?
They look as if they were "refurbished" it's a few bucks to replace the effected ones and if that's worth your peace of mind it's worth it.
11-16-2013, 06:04 AM
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Re: what could do this to the valve?
i will probably replace them all with something better anyway and go oversized on the intakes. i want to replace the guides, its a alaniz head and has oem guides cut down
11-18-2013, 05:33 AM
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Re: what could do this to the valve?
My guess would be foreign object...possibly a spark plug losing a portion of its tip or porcelain during normal running.
11-18-2013, 08:37 AM
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Re: what could do this to the valve?
just a scratch with the light hitting it at the right angle. anyone know if the new rev valves are the same as the old xvt valves? looking for a price on 2 replacements before i decided to re do the head over.
11-19-2013, 06:04 AM
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Re: what could do this to the valve?
Yea brain fart on my part, I would think damaged wouldn't only be on the back of the valve then in one section if it was something foreign. I think it was heat related though, big stroke 17:1 comp is going to need to get a lot of exhaust gas out and fast. Bouncing off the limiter maybe , either way will probably upgrade to some oversized exhaust inconel valves.
11-19-2013, 07:16 PM
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Re: what could do this to the valve?
My guess would be a corrosive fuel like you were told. I don't see how a foreign object would damage only that part of the valve and none of the combustion chamber.
11-20-2013, 05:14 AM
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Re: what could do this to the valve?
Anybody have any issues at all with rev valves? If I don't need to change the intakes, I will leave them and either ferrea or supertech on the exhaust.
11-24-2013, 04:23 AM
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Re: what could do this to the valve?
Valves are cheap all things considered. Just replace all of them. Another 140 or so likes on my FB page and I'm giving another set away. We have given about 10 sets this year.
11-24-2013, 04:37 AM
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Re: what could do this to the valve?
5 angle was already done on the intake side didn't really want to mess with that side except for the guides, andi already liked u guys lol. Awesome work btw.
