Titanium valves?
Thread Starter
Joined: Oct 2006
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From: Webb City, MO...out in the garage
Titanium valves? i'm looking at getting a set of heads that have stainless valves in them, and i want to run some Titanium valves in their place. where should/can i get some? what do they usually cost? what are stainless valves worth for me to sell?
thanks guys,
ben
thanks guys,
ben
On The Tree
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From: Braking Point, Turn In, Apex, Exit - Repeat
You only want to use Ti on the intake valves, Ti is not a good idea for the exhaust valves they don't handle the heat. Look at the LS7 there is a reason that GM still uses a sodium filled exhaust valve.
I've seen what happens when Ti is used on the exhaust valves it's not pretty when they fail.
I've seen what happens when Ti is used on the exhaust valves it's not pretty when they fail.
You only want to use Ti on the intake valves, Ti is not a good idea for the exhaust valves they don't handle the heat. Look at the LS7 there is a reason that GM still uses a sodium filled exhaust valve.
I've seen what happens when Ti is used on the exhaust valves it's not pretty when they fail.
I've seen what happens when Ti is used on the exhaust valves it's not pretty when they fail.
In a turbo or nitrous engine, steel or inconel would probably be a better choice though.
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What size valves do you need? You can find a plethora of them on ebay, but more than likely they'll be in a different guide size. You can have them shortened and turned down to fit certain applications.
Thread Starter
Joined: Oct 2006
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From: Webb City, MO...out in the garage
cool...thanks guys, that gives me a good place to start.
the reason i ask is because i was looking at running TSP's LS7R cam and they said that due to the violent ramp rates of the lobes Ti valves were necessary...i'm assuming to prevent valve float and/or some other undesired valve event.
IF that's the case, or if that's the reason Ti valves are recommended, wouldn't you want both intake AND exhaust valves? FWIW, i'll be running a 11.5:1-ish LS7-headed motor if i can work out the whole "money" thing
the reason i ask is because i was looking at running TSP's LS7R cam and they said that due to the violent ramp rates of the lobes Ti valves were necessary...i'm assuming to prevent valve float and/or some other undesired valve event.
IF that's the case, or if that's the reason Ti valves are recommended, wouldn't you want both intake AND exhaust valves? FWIW, i'll be running a 11.5:1-ish LS7-headed motor if i can work out the whole "money" thing
Titanium exhaust valves tend to pop the ends off. They don't handle the heat well. Like it was mentioned before inconel or hollow / sodium filled exhuast valves are the way to go. What size valves do you plan on running?
Thread Starter
Joined: Oct 2006
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From: Webb City, MO...out in the garage
probably a 2.200 / 1.600. i thought about going Ti/Inconel.....i dunno, what's a inconel valve weigh compared to sodium filled?
TECH Regular
Joined: Aug 2003
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From: Texas
you can run titanium exhaust valves..do it all the time on big nitrous/turbo/blower applications with no problems whatsoever but we do run berrliyum copper seats. Have run titanium exhaust valves on some spec dirt track stuff with no problems also on iron seats.
Any reputable engine/head builder will recommend inconel over titanium in a very high EGT situation. The intake valve is fine, because it doesnt saturate front and back like the exhaust side does. From a practical sense I know that it can work. My uncles offshore boat has a 540BBC with a roots blower running 100 blend at 1200hp all day with titanium on both sides. No issues with it there..........But again, a builder is going to like the inconel better simply for metalurgy reasons.
90% of the stuff is ebay is titanium coated, and if you find actually solid ti. valves for a different use, the cost for machining is going to equal or outweigh buying the right stem size and length from the get go.
TECH Regular
Joined: Aug 2003
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From: Texas
I understand what your saying xfactor..we just havent had any problems running titanium exhaust valves in john urist or dan saitz's heads for example. Heads come back in for a refreshen and clean up within a couple thousandths on valves and seats..We do have to run steel exhaust guides though.
I dont doubt what you are saying, and you sound like a sharp guy. I just wanted to warn the lessor knowledgable ones reading that just because the add says titanium, doesnt mean it really is. IE. if the set of valves are $100, you can bet they arent Ti. About what is that guy charging to rework valves, our of curiousity sake? I ask, because I know of two guys that do it locally and its not really viable.
I understand what your saying xfactor..we just havent had any problems running titanium exhaust valves in john urist or dan saitz's heads for example. Heads come back in for a refreshen and clean up within a couple thousandths on valves and seats..We do have to run steel exhaust guides though.
About what EGT (at collector or primary) are they subjected to?
I still have the intake valves and will be sending them to him at some point more that likely to adapt them into a set of heads I'll be using shortly. I just need some money to get that project going again. I bought the exhaust valves planning on running them in a rather radical gen I small block application before I avoided that money pit all together and bought my Formula. I plan on running inconel exhaust valves in those same heads as I don't want to have to mess with them too much.