Alternate Valves

[europeanme]

after various hunts around the old internet i have decided to sort out replacement valves. Anyone got any theories/opinions of using standard OEM inlet valves and stainless steel exhaust valves? is it just as easy to stick to OEM for both or change both sets...

cheers for any advice given..

cheers
Mike

[Error404]

I'm interested in this also

[AndyP]

What did you go for in the end Mike?

[recall]

I am running std inlet valves and 1mm over size stainless exhaust valves in my car.

lance

[A80Avant]

Just to add, I'm running the slightly bigger valves myself inlet and exhaust 1mm stainless from rosten perofrmance. I think they are supertech

[JP]

Intake stock swirl polished and back cut outflows supertech stock size. Exhaust upgrade to inconel stock size if doing budget job. Only fit oversized on exhaust if headwork is done to match or you'll wear guides rapidly and burn valve seats.

[JP]

Almost forgot only fit oversized intake if doing headwork to suit and fitting aftermarket intake

[A80Avant]

all of the above done.

just didn't fit inconel as stock doesn't use inconel and the price difference was fairly high. Stainless are still good imo

[europeanme]

stock valves!....lets see what happens

[SteveH]

stock valves!....lets see what happens

What sort of money Mike?

[europeanme]

What sort of money Mike?

If memory serves, and I cannot bring myself to add up all the receipts I have had for this build, its about £168 each side (exhaust & inlet)....

if I had my time again I would have gone ferrea valves.....although the inconel ones would be nice if I didn't have the complete engine to pay for....maybe next time...

[JP]

I feel stock sodium filled are better than solid stainless on the exhaust. As the sodium filled stems are there to help draw the heat away from the valve head conducting it to the tip on the valve lock end to be cooled by the engine oil. Get rid of the heat transfer abilities and the valve face becomes more prone to pitting from exhaust heat. Inconel is not much better than stainless at conducting the heat away from the head but it is more resistant against pitting.

If you look at ferrea's valves for pro mod engines they're all sodium filled designed to handle 2400fahrenheit.

[|CL|NIKI]

Which ferrea valves - Super alloy or 6000? (or they are same)