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Author Topic: Bigger valves for frankenmotor?  (Read 4503 times)

July 01, 2009, 06:34:32 pm

rallydiesel

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Bigger valves for frankenmotor?
« on: July 01, 2009, 06:34:32 pm »
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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Reply #1July 11, 2009, 02:45:17 pm

rallydiesel

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Re: Bigger valves for frankenmotor?
« Reply #1 on: July 11, 2009, 02:45:17 pm »
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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1991 Jetta TD - sold :(
2001 Golf TDI - Son's
1981 Rabbit - BEW tdi swap project

"ONCE YOU GO CLACK, YOU NEVER GO BACK"
Reply #2July 11, 2009, 03:06:42 pm

RabbitJockey

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Re: Bigger valves for frankenmotor?
« Reply #2 on: July 11, 2009, 03:06:42 pm »
i believe a few people on here have done it.  but i have nothing to share other than that
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Reply #3July 12, 2009, 08:32:02 am

andy2

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Re: Bigger valves for frankenmotor?
« Reply #3 on: July 12, 2009, 08:32:02 am »
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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Reply #4July 12, 2009, 11:02:56 am

Rabbit on Roids

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Re: Bigger valves for frankenmotor?
« Reply #4 on: July 12, 2009, 11:02:56 am »
Quote from: rallydiesel on July 11, 2009, 02:45:17 pm
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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Reply #5July 12, 2009, 12:51:10 pm

rallydiesel

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Re: Bigger valves for frankenmotor?
« Reply #5 on: July 12, 2009, 12:51:10 pm »
Quote from: andy2 on July 12, 2009, 08:32:02 am
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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1991 Jetta TD - sold :(
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1981 Rabbit - BEW tdi swap project

"ONCE YOU GO CLACK, YOU NEVER GO BACK"
Reply #6July 12, 2009, 12:56:31 pm

Rabbit on Roids

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Re: Bigger valves for frankenmotor?
« Reply #6 on: July 12, 2009, 12:56:31 pm »
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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Reply #7July 12, 2009, 02:03:41 pm

rallydiesel

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Re: Bigger valves for frankenmotor?
« Reply #7 on: July 12, 2009, 02:03:41 pm »
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.
« Last Edit: July 12, 2009, 02:06:02 pm by rallydiesel »
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2006 Jetta TDI - gtb1749v, Malone 2, Frank's Titan 2 cam, VR6 clutch....
1991 Jetta TD - sold :(
2001 Golf TDI - Son's
1981 Rabbit - BEW tdi swap project

"ONCE YOU GO CLACK, YOU NEVER GO BACK"
Reply #8July 12, 2009, 03:43:55 pm

carrizog60

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Re: Bigger valves for frankenmotor?
« Reply #8 on: July 12, 2009, 03:43:55 pm »
g60 valves are also sodium filled.
dont know if the size is right... ::)
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Reply #9July 12, 2009, 04:58:19 pm

8v-of-fury

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Re: Bigger valves for frankenmotor?
« Reply #9 on: July 12, 2009, 04:58:19 pm »
Why are they sodium filled? what does that help with? strength and heat dissipation?
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Reply #10July 12, 2009, 05:02:09 pm

rallydiesel

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Re: Bigger valves for frankenmotor?
« Reply #10 on: July 12, 2009, 05:02:09 pm »
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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2006 Jetta TDI - gtb1749v, Malone 2, Frank's Titan 2 cam, VR6 clutch....
1991 Jetta TD - sold :(
2001 Golf TDI - Son's
1981 Rabbit - BEW tdi swap project

"ONCE YOU GO CLACK, YOU NEVER GO BACK"
Reply #11July 12, 2009, 05:06:52 pm

8v-of-fury

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Re: Bigger valves for frankenmotor?
« Reply #11 on: July 12, 2009, 05:06:52 pm »
are these diesel valves stainless steel AND sodium filled? if not SS what are they made of?
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Reply #12July 12, 2009, 09:25:42 pm

Aki-76

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Re: Bigger valves for frankenmotor?
« Reply #12 on: July 12, 2009, 09:25:42 pm »
My new twinturbo engine use 41mm intake and 36mm exhaust valve,both are ceramic coated.
http://s434.photobucket.com/albums/qq68/Aki-76/moottorin%20osia/?action=view&current=13042009348.jpg

This valve is N2 41 stainless steel,very hard stuf.

Early engine use bmw valves,39/34mm,and whit 2.6 bar boos reduse about 200kw.
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Reply #13July 12, 2009, 10:00:45 pm

rallydiesel

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Re: Bigger valves for frankenmotor?
« Reply #13 on: July 12, 2009, 10:00:45 pm »
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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2006 Jetta TDI - gtb1749v, Malone 2, Frank's Titan 2 cam, VR6 clutch....
1991 Jetta TD - sold :(
2001 Golf TDI - Son's
1981 Rabbit - BEW tdi swap project

"ONCE YOU GO CLACK, YOU NEVER GO BACK"
Reply #14July 13, 2009, 12:38:29 am

rabbitman

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Re: Bigger valves for frankenmotor?
« Reply #14 on: July 13, 2009, 12:38:29 am »
Quote from: 8v-of-fury on July 12, 2009, 04:58:19 pm
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. ;D
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