Modified head - what valves do you run? Poll!

[A80Avant]

I am not sure but I used stainless steel 0.5mm larger on exhaust and intake.

[rst]

I am using stock sodium AAN valves.
Revlimiter 7200

[speeding-g60]

i run Supertech inconel exhaust and nitrided SS in the AWD car (small port head, solid lifter, +1mm). ~1100 BHP, hand ported small port. 9500+ rpm regularly, 12,011 rpm once accidentally without damage.



in the new motor (RWD tube chassis), Ferrea Super-Alloy and Comp Plus intakes, solid lifter, +1mm. untested yet, large port CNC ported. will run 9500 - 10,000 rpm.

[Thuppu]

Was this head on yours Thuppu?these engines are getting old and valve train are very tired worn so need replacing or rebuilding with new parts if going more power

Not mine, my friends. Also did a hole in the piston.

Inconel missing off poll list. A popular material for running near the ragged edge.

Ooh crap, forgot about that. Seems that I can't edit the poll. Maybe some moderator can add "Inconel valves" on the list..?

[AndyP]

Don't use used valves, as stated I found out this the hard way!! I went with new Audi valves in the end, but if I were doing it again I'd probabley use these

http://www.ebay.co.uk/itm/2905577457...%3AMEBIDX%3AIT

[woodwoody]

Hi guys slightly off topic but im looking for recommend place for building my AAN head up ported polished new valve ect it needs to be capable of 700bhp spec

[V6quattro]

I still use stock ABY valves and upgraded springs on my setup. Running 8000rpm revlimit and 2.3bar boost.

But when i get my head ported i will upgrade the valves so i'm sure they won't brake.

[diesel des]

Hi guys slightly off topic but im looking for recommend place for building my AAN head up ported polished new valve ect it needs to be capable of 700bhp spec

Jp, Jnlracing is your man.


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[RichLV]

Don't use used valves, as stated I found out this the hard way!! I went with new Audi valves in the end, but if I were doing it again I'd probabley use these

http://www.ebay.co.uk/itm/2905577457...%3AMEBIDX%3AIT

OEM is true, but costs a damn fortune. :/

I'm thinking about TRW 33125 & 33050. Anyone used TRW engine stuff before?

[diesel des]

With oem kit you run the risk of the head falling off the stem as they are friction welded.

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[rxl]

i went for supertech valves..

[RichLV]

With oem kit you run the risk of the head falling off the stem as they are friction welded.

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At what power/torque/rpm is this risk possible?

[diesel des]

It can happen on stock cars.

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[RichLV]

Sheet... What should I pick then...

[Error404]

To be fair how many stock 20vt motors drop valves? Never heard of a single instance. Asking a 25yr old valve that's probably done minimum 150k miles to take the heat and revs of a modified engine is what can cause a failure - fatigue. On a road car OEM valves are the still the best option IMHO.