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Silvermachine81
Guest
What are the benefits and downsides of titanium.
I know I have to run lash caps but what else?
I know I have to run lash caps but what else?
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rosco15
Guest
One of the guys put TI valves in his 8.20 bike last year. It ran slower and he went back to stainless.
R
Robert Corrie
Guest
Plus they cost a fortune.
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Silvermachine81
Guest
rosco15 said:
Is there any scientific explanation why?
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Silvermachine81
Guest
Robert Corrie said:
A professional race mechanic friend of mine is gonna sort some out for me.
He has his own shop and it sounds like they will cost very very little :wink:
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Silvermachine81
Guest
KGB said:
Sorry im lost.
Is stainles or titanium better and lighter :?:
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rosco15
Guest
No scientific explanation. Just real world testing. The bike ran slower so he took them out. I was surprised to hear it myself. Maybe it has something to do with the shape/design of the TI valve.
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Silvermachine81
Guest
Wow, Yeah it must be the design of them.
You think given the price that they would rock!!!
You think given the price that they would rock!!!
A
Anonymous
Guest
street bike? SS
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Silvermachine81
Guest
nobars said:
Why? Clearance issues or something :?:
I'm gonna be getting these cheaper than a set of stainless :wink:
M
mike J
Guest
Keep in mind that if you go to titanium valves you need to change the valve seats to copper berillium. Titanium valves are not compatiable with stock seat materails. Very expensive change over. Mike J
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topgasnossuzuki
Guest
ti is good for a high reving motor (lighter less valve float) they also flow better because the tulip (where the head and stem meet) is thinner. they are a must if you go 33mm stainless is way to heavy. downsides: they are close to $100 a pop. you have to run lash caps, star retainers with lash caps built into keepers, or gsxr shim type retainers and shims (i like these best because the caps spit and the star deal breaks the tip off the valve) if it was me and i wasnt running pro stock. definatly stainless
A
Anonymous
Guest
I understand wear is an issue...
G
Guest
Guest
The upside;
Lighter, which allows you to run less spring pressure, which makes a tad more power. ( Titanium is about 9/16th the weight of steel or stainless)
The valve head can be flat instead of dished which raises cylinder pressure.
Downside:
Expensive
Soft, so lash caps must be used.
Must use bronze seats. Soft titanium won't last long closing on a steel seat. Many of the new bikes from Japan have titanium valves with steel seats and are having much problems.
Jay
Lighter, which allows you to run less spring pressure, which makes a tad more power. ( Titanium is about 9/16th the weight of steel or stainless)
The valve head can be flat instead of dished which raises cylinder pressure.
Downside:
Expensive
Soft, so lash caps must be used.
Must use bronze seats. Soft titanium won't last long closing on a steel seat. Many of the new bikes from Japan have titanium valves with steel seats and are having much problems.
Jay
A
Addy Leung
Guest
may I have few questions here,
What type of stainless steel to be used for valve materials? 302, 316, 304 or something esle?
Could we ask the machine shop to tailor make the valves for replacement?
any heat treament requied to be done for the new valaves?
What type of stainless steel to be used for valve materials? 302, 316, 304 or something esle?
Could we ask the machine shop to tailor make the valves for replacement?
any heat treament requied to be done for the new valaves?
G
Guest
Guest
Why would you want to have a shop make stainless valves from scratch, when they are an off the shelf item?
http://www.gszone.biz/valves.html
Jay
http://www.gszone.biz/valves.html
Jay
A
Addy Leung
Guest
BJ, yes, thanks for your information. But I am living at Hong Kong and there is a lot of good machine shops. So I just think whether I can make some of these valves by them.
A
Addy Leung
Guest
Hi BJ,
I did some research and found following: It seems making a valve is not a simple job.
http://www.federal-mogul.com/fmeconnect/technicalservices/downloads/1108.pdf
http://www.supertechperformance.com/technology.htm
These materials are selected to meet specific engine requirements. The definition of ?stainless steel? is generally
accepted to be a steel alloy containing at least 10% chromium in its composition. As can be seen below, Sil 1
approaches this level while maintaining many of the favorable characteristics and lower costs associated with the
inexpensive carbon steel alloys. Sil XB, 422, 21-2N, and 21-4N are true stainless alloys.
1541: Carbon steel with added manganese for improved corrosion resistance
8440: Medium to heavy duty steel alloy with a higher chromium content to enhance high temperature
strength.
Sil 1: Heavy duty steel alloy with an 8.5% chromium content for excellent high temperature performance.
Used for many factory high performance intake valves.
Sil XB: A ferritic stainless steel alloy, with 20% chromium content and 1.3% nickel. Used in heavy duty
intake valves.
422: A stainless steel alloy specified for high performance intake valve usage. This specialty type of
stainless is designed with the temperature ranges and characteristics of intake valves usage in
mind, and is different from the more common exhaust valve stainless materials. Our 422 stainless
valves are easily equal to any of the ?severe use? valves on the market.
Ti-6: Titanium is a lightweight, nonferrous material used in high RPM racing applications. It is 40%
lighter than steel and maintains its strength at high temperatures. Normally used for the larger
intake valves, although there are limited uses for titanium exhaust valves as well.
21-2N: Austenitic stainless steel with 21% chromium and 25 NICKEL. As the most popular exhaust valve
material, it has excellent performance characteristics at elevated temperatures. With additional heat
treating and manufacturing processes, this material can be upgraded to become the ultimate choice
for exhaust usage. With different processes, it makes for a good quality, inexpensive intake valve
as well.
21-4N: An Austenitic stainless steel similar to 21-2N, except for a greater nickel content (4%), used as an
alternate to 21-2N.
I did some research and found following: It seems making a valve is not a simple job.
http://www.federal-mogul.com/fmeconnect/technicalservices/downloads/1108.pdf
http://www.supertechperformance.com/technology.htm
These materials are selected to meet specific engine requirements. The definition of ?stainless steel? is generally
accepted to be a steel alloy containing at least 10% chromium in its composition. As can be seen below, Sil 1
approaches this level while maintaining many of the favorable characteristics and lower costs associated with the
inexpensive carbon steel alloys. Sil XB, 422, 21-2N, and 21-4N are true stainless alloys.
1541: Carbon steel with added manganese for improved corrosion resistance
8440: Medium to heavy duty steel alloy with a higher chromium content to enhance high temperature
strength.
Sil 1: Heavy duty steel alloy with an 8.5% chromium content for excellent high temperature performance.
Used for many factory high performance intake valves.
Sil XB: A ferritic stainless steel alloy, with 20% chromium content and 1.3% nickel. Used in heavy duty
intake valves.
422: A stainless steel alloy specified for high performance intake valve usage. This specialty type of
stainless is designed with the temperature ranges and characteristics of intake valves usage in
mind, and is different from the more common exhaust valve stainless materials. Our 422 stainless
valves are easily equal to any of the ?severe use? valves on the market.
Ti-6: Titanium is a lightweight, nonferrous material used in high RPM racing applications. It is 40%
lighter than steel and maintains its strength at high temperatures. Normally used for the larger
intake valves, although there are limited uses for titanium exhaust valves as well.
21-2N: Austenitic stainless steel with 21% chromium and 25 NICKEL. As the most popular exhaust valve
material, it has excellent performance characteristics at elevated temperatures. With additional heat
treating and manufacturing processes, this material can be upgraded to become the ultimate choice
for exhaust usage. With different processes, it makes for a good quality, inexpensive intake valve
as well.
21-4N: An Austenitic stainless steel similar to 21-2N, except for a greater nickel content (4%), used as an
alternate to 21-2N.
