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Bigger valves for frankenmotor?
by
rallydiesel
on 01 Jul, 2009 18:34
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Has anybody found larger valves for the AAZ head that are ready to use? I'm watching a similar topic at tdiclub but people here often have a better knowledge base on the fringe stuff. I know I am obviously going to need to enlarge the valve seats but I'd like to be able to use the stock valve guides. I would like to avoid custom valves if possible.
Any info out there?
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#1
by
rallydiesel
on 11 Jul, 2009 14:45
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If I used 2 mm larger valves, would I need new, larger seats, or would the stock seats be able to be ground?
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#2
by
RabbitJockey
on 11 Jul, 2009 15:06
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i believe a few people on here have done it. but i have nothing to share other than that
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#3
by
andy2
on 12 Jul, 2009 08:32
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I would not bother up sizing the valves unless you have a big turbo to go with them.What size turbo are you using?
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#4
by
Rabbit on Roids
on 12 Jul, 2009 11:02
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If I used 2 mm larger valves, would I need new, larger seats, or would the stock seats be able to be ground?
im pretty sure the stock seats wont take a +2 valve. what difference would it make what valve you have in there if you have the same size seat. it still has the same size hole underneath the valve. doesnt make much sense to me to use a stock seat with a huge valve.
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#5
by
rallydiesel
on 12 Jul, 2009 12:51
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I would not bother up sizing the valves unless you have a big turbo to go with them.What size turbo are you using?
I don't have one yet but I am planning on going big. Either large vnt or possibly compound. I'm just putting this engine together gradually. I was on the techtronics site and they have a few oversized 8v hydro gasser valves.
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#6
by
Rabbit on Roids
on 12 Jul, 2009 12:56
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hydro gas valves wont work. dont mean to burst your bubble.
but it just wont work. no matter what.
you need diesel valves. they are alot longer than gas valves. and im pretty sure the diesel exhaust valves are sodium filled.
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#7
by
rallydiesel
on 12 Jul, 2009 14:03
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You're not bursting my bubble. I'm asking to get info. I guess I'll have to check into stainless blanks then. Sodium filling is not important to me.
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#8
by
carrizog60
on 12 Jul, 2009 15:43
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g60 valves are also sodium filled.
dont know if the size is right...
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#9
by
8v-of-fury
on 12 Jul, 2009 16:58
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Why are they sodium filled? what does that help with? strength and heat dissipation?
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#10
by
rallydiesel
on 12 Jul, 2009 17:02
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As far as I know, heat dissipation. Which is strange, because stainless steel valves are often used in high performance gas heads and they run hotter exhaust manifold temps.
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#11
by
8v-of-fury
on 12 Jul, 2009 17:06
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are these diesel valves stainless steel AND sodium filled? if not SS what are they made of?
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#12
by
Aki-76
on 12 Jul, 2009 21:25
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#13
by
rallydiesel
on 12 Jul, 2009 22:00
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Are those from blanks? What diameter are the valve stems? Did you get new valve seats? Any more pics of your cylinder head?
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#14
by
rabbitman
on 13 Jul, 2009 00:38
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Why are they sodium filled? what does that help with? strength and heat dissipation?
The sodium is in the length of the stem, it melts at running temp and bounces up and down carrying heat from the valve head up to the cylinder head keeping the sealing surface from melting.
If you find a junk sodium valve cut a notch in the stem and throw it in a bucket of water, it reacts and bubbles lots.
