cuatrokoop

If I can get 1 to 60 people rounded up, I can have a large quantity of 40mm stainless steel intake valves and 33mm inconel exhaust valves made for possibly as little as $170/set of 10 (60 people) to as much as $500/set of 10 (1-30 people). The inbetween dollar amount will just depend on how many people there are. Turn around time will be three weeks from the order. If I don't get more than 30 people, I will not place the order. You must pay in advance, that is how the company works.

If need be, can do one type or the other to reduce cost.

Please, if you are interested, email me at fergusoe at purdue dot edu.

J.Moss@TorqueFactory

Do people burn the stock ones?

Toxcheap

<img SRC="http://audi.newtsplace.com/forum/files/thumbs/t_steves_1.jpg">

cuatrokoop

And others that have had problems.

A few guys running higher boost have had exhaust valve problems, burned, dropped, one even had one fail rather oddly (he felt the power drop off, car go down to 4cyl. Pulled the head and found one of the E valves had broken/chipped away in one area and never found the bits that broke away, no damage to the turbo either).

Oh, also, these are for use in a hydraulic head, I can't remember if I mentioned that or not? So they are 91.2 and 91.9mm long.

J.Moss@TorqueFactory

caused by-
Overretarded timing
lean mixture
Detonation

The oem valves should stay together if egts are kept to reasonable levels.

Jeff Moss

cuatrokoop

Turbos ranging from rebuilt stock K26's to T04 hybrids.

None of the cars I know of had any evidence of knock/ping, bad timing tables (QLCC has been used in how many cars? EFI cars were dyno tuned with wideband O2's), or lean conditions.

J.Moss@TorqueFactory

timing.

cuatrokoop

I don't know their EGT's, but like I said none of the cars had any signs of knock/ping according to their owners. With the tried and true QLCC, there shouldn't be. With a dyno tuned 370hp engine, there shouldn't be either. Especially when that person was not running 91oct (Javad regularly puts 104 or 110 in the tank to bring up the pump gas octane rating). The others I know of run 93oct and 1bar, pretty typical setups. The guys that run more have all the CIS equipement to adjust the mixture or put the car on a dyno and mess with their maps electronically.

The cars it has happened on may have been flukes, but one they thing all shared in common was high miles on the engines (150, 200k, etc). Valves not only see thermal cycling but mechanical as well. Most of the failures I saw have been not at the stem (unless a dist. or t-belt failure at high rpm which can do damage, likely from valve float) but near where the valve contacts the seat. Should it happen on an unstressed engine? No. Should it happen on a stressed engine? No, but it has.

I just figured that some fellow 10vt owners may want to take advantage of some hopefully very good prices on custom valves by a company that knows their stuff. I've got around 15 positives and a handful of maybe's, so I'm still well shy of the huge price break that happens with 60 orders. I'll give it some more time, but I need to get my engine finished up, so I can work on and finish the rest of the car.

shortyq

What's the benefit of inconel over sodium filled in the turbo head? Remember too, that a sodium filled valve is designed to spread the heat thru the shaft of the valve, preventing hot spots that eat valve guides.

I suspect in any 10vt valve problem is mostly due to lean mixture, not a valve problem. I've run 22psi thru CIS for years without ever burning a valve. I'm with whomever below is looking at EGT. Hi EGT = Hi rate of failure.

Javad on the other hand, certainly could have been running ignition timing/fuel that started cooking valves. OR, those running N/A heads in a turbo application, don't have a sodium filled exhaust valve (not sure what the pictures are showing).

I'm not at all convinced that a another valve than a sodium filled is going to solve the problems of roasting them. The *problem* is upstream or downstream, IMO/E.

HTH and my .02

Scott Justusson
QSHIPQ Performance Tuning

quattro90S6

What may you be selling??