Titanium Wheel Lug Project...
#47
Registered User
Thread Starter
Join Date: Mar 2004
Posts: 1,401
Likes: 0
Received 0 Likes
on
0 Posts
You have to remove the front and rear spindles and support them around the lugs to remove the stock ones... You can press them out or hit them with a hammer carefully; you cannot hit them with a hammer or put impact pressure on the bearings as you will destroy the bearings and the bearing chase...
The fronts are easier than the rears as the fronts can be removed bearings and all with four bolts (Very cool...), the rears have to come apart...
The fronts are easier than the rears as the fronts can be removed bearings and all with four bolts (Very cool...), the rears have to come apart...
#48
Registered User
Thread Starter
Join Date: Mar 2004
Posts: 1,401
Likes: 0
Received 0 Likes
on
0 Posts
cgrx: Thanks, I did all the drawings and specs myself so that saved me some dollars, the prototype came out to about U$620.00... The production ones will run about U$300.00-320.00 for a set of 20... if I make enough I can probably get them down to U$250.00-275.00...
This is the only RX8 right now with titanium lugs, and with the new wheels and two piece brake rotors as well as the light weight forged lug nuts she is going to handle and spin up real nice...
Plus it looks really cool and should rack up a bunch of points at the shows...
This is the only RX8 right now with titanium lugs, and with the new wheels and two piece brake rotors as well as the light weight forged lug nuts she is going to handle and spin up real nice...
Plus it looks really cool and should rack up a bunch of points at the shows...
#49
Registered User
Thread Starter
Join Date: Mar 2004
Posts: 1,401
Likes: 0
Received 0 Likes
on
0 Posts
Ok, did some more calculations on weight reduction including the light forged lug nuts I have on the car...
Stock lug nut 2oz (2x5=10oz per corner) 10x4=40oz or 2.5lbs...
Forged lug nuts 1oz (1x5=5oz per corner) 5x4=20oz or 1.25lbs...
That is another 1 1/4 lbs savings in unsprung rotating weight, including the 1 1/2 lbs savings of the titanium lug bolts that is a total of 2 3/4 lbs...
When rotating at high speed that weight increases by a factor of 7 or 19.25lbs...
I took the car out for a ride with the stock lugs and bolts before doing the install and then with the titanium lug bolts and lightweight forged lug nuts and there was a difference you could feel... With the new wheels and two piece brake rotors this should really lighten things up.
So for those that ask, does reduced unsprung weight or rotating unsprung weight reduction make a difference?; the answer is yes...
Stock lug nut 2oz (2x5=10oz per corner) 10x4=40oz or 2.5lbs...
Forged lug nuts 1oz (1x5=5oz per corner) 5x4=20oz or 1.25lbs...
That is another 1 1/4 lbs savings in unsprung rotating weight, including the 1 1/2 lbs savings of the titanium lug bolts that is a total of 2 3/4 lbs...
When rotating at high speed that weight increases by a factor of 7 or 19.25lbs...
I took the car out for a ride with the stock lugs and bolts before doing the install and then with the titanium lug bolts and lightweight forged lug nuts and there was a difference you could feel... With the new wheels and two piece brake rotors this should really lighten things up.
So for those that ask, does reduced unsprung weight or rotating unsprung weight reduction make a difference?; the answer is yes...
#51
Registered User
Thread Starter
Join Date: Mar 2004
Posts: 1,401
Likes: 0
Received 0 Likes
on
0 Posts
They are T4 very pure (High Oxygen), they are forged then heat treated...
Grades Description
Grade 1 Unalloyed titanium, low oxygen, low strength
Grade 2 Unalloyed titanium, standard oxygen, medium strength
Grade 3 Unalloyed titanium, medium oxygen, high strength
Grade 4 Unalloyed titanium, high oxygen, extra high strength
Grade 5 Titanium alloy (6% aluminum, 4% vanadium)
Grade 7 Unalloyed titanium plus 0.12% to 0.25% palladium, standard oxygen, medium strength
Grade 9 Titanium alloy (3% aluminum, 2.5% vanadium), high strength. Mainly aerospace applications
Grade 11 Unalloyed titanium plus 0.12% to 0.25% palladium, low oxygen, low strength
Grade 12 Titanium alloy (0.3% molybdenum, 0.8% nickel), high strength
Grade 13 Titanium alloy (0.5% nickel, 0.05% ruthenium), low oxygen
Grade 14 Titanium alloy (0.5% nickel, 0.05% ruthenium), standard oxygen
Grade 15 Titanium alloy (0.5% nickel, 0.05% ruthenium), medium oxygen
Grade 16 Unalloyed titanium plus 0.04% to 0.08% palladium, standard oxygen, medium strength
Grade 17 Unalloyed titanium plus 0.04% to 0.08% palladium, low oxygen, low strength
Grade 18 Titanium alloy (3% aluminum, 2.5% vanadium plus 0.04% to 0.08% palladium),
Grade 19 Titanium alloy (3% aluminum, 8% vanadium, 6% chromium, 4% zirconium, 4% molybdenum)
Grade 20 Titanium alloy (3% aluminum, 8% vanadium, 6% chromium, 4% zirconium, 4% molybdenum) plus 0.04% to 0.08% palladium
Grade 21 Titanium alloy (15% molybdenum, 3% aluminum, 2.7% niobium, 0.25% silicon)
Grade 23 Titanium alloy (6% aluminum, 4% vanadium, extra low interstitial, ELI)
Grade 24 Titanium alloy (6% aluminum, 4% vanadium) plus 0.04% to 0.08% palladium
Grade 25 Titanium alloy (6% aluminum, 4% vanadium) plus 0.3% to 0.8% nickel and 0.04% to 0.08% palladium
Grade 26 Unalloyed titanium plus 0.08% to 0.14% ruthenium, standard oxygen, medium strength
Grade 27 Unalloyed titanium plus 0.08% to 0.14% ruthenium, low oxygen,low strength
Grade 28 Titanium alloy (3% aluminum, 2.5% vanadium) plus 0.08% to 0.14% ruthenium
Grade 29 Titanium alloy (6% aluminum, 4% vanadium with extra low interstitial elements (ELI) plus 0.08% to 0.14% ruthenium
Grades Description
Grade 1 Unalloyed titanium, low oxygen, low strength
Grade 2 Unalloyed titanium, standard oxygen, medium strength
Grade 3 Unalloyed titanium, medium oxygen, high strength
Grade 4 Unalloyed titanium, high oxygen, extra high strength
Grade 5 Titanium alloy (6% aluminum, 4% vanadium)
Grade 7 Unalloyed titanium plus 0.12% to 0.25% palladium, standard oxygen, medium strength
Grade 9 Titanium alloy (3% aluminum, 2.5% vanadium), high strength. Mainly aerospace applications
Grade 11 Unalloyed titanium plus 0.12% to 0.25% palladium, low oxygen, low strength
Grade 12 Titanium alloy (0.3% molybdenum, 0.8% nickel), high strength
Grade 13 Titanium alloy (0.5% nickel, 0.05% ruthenium), low oxygen
Grade 14 Titanium alloy (0.5% nickel, 0.05% ruthenium), standard oxygen
Grade 15 Titanium alloy (0.5% nickel, 0.05% ruthenium), medium oxygen
Grade 16 Unalloyed titanium plus 0.04% to 0.08% palladium, standard oxygen, medium strength
Grade 17 Unalloyed titanium plus 0.04% to 0.08% palladium, low oxygen, low strength
Grade 18 Titanium alloy (3% aluminum, 2.5% vanadium plus 0.04% to 0.08% palladium),
Grade 19 Titanium alloy (3% aluminum, 8% vanadium, 6% chromium, 4% zirconium, 4% molybdenum)
Grade 20 Titanium alloy (3% aluminum, 8% vanadium, 6% chromium, 4% zirconium, 4% molybdenum) plus 0.04% to 0.08% palladium
Grade 21 Titanium alloy (15% molybdenum, 3% aluminum, 2.7% niobium, 0.25% silicon)
Grade 23 Titanium alloy (6% aluminum, 4% vanadium, extra low interstitial, ELI)
Grade 24 Titanium alloy (6% aluminum, 4% vanadium) plus 0.04% to 0.08% palladium
Grade 25 Titanium alloy (6% aluminum, 4% vanadium) plus 0.3% to 0.8% nickel and 0.04% to 0.08% palladium
Grade 26 Unalloyed titanium plus 0.08% to 0.14% ruthenium, standard oxygen, medium strength
Grade 27 Unalloyed titanium plus 0.08% to 0.14% ruthenium, low oxygen,low strength
Grade 28 Titanium alloy (3% aluminum, 2.5% vanadium) plus 0.08% to 0.14% ruthenium
Grade 29 Titanium alloy (6% aluminum, 4% vanadium with extra low interstitial elements (ELI) plus 0.08% to 0.14% ruthenium
Last edited by cortc; 09-08-2004 at 02:35 PM.
#52
Registered User
Thread Starter
Join Date: Mar 2004
Posts: 1,401
Likes: 0
Received 0 Likes
on
0 Posts
More Information...
List of Titanium Grades
ASTM Grade Alloy Composition Min. Tensile (KSI) Min. Yield (KSI) Modulus of Elasticity (PSI-106)
1 Unalloyed Ti ("Pure") 35A 35 25 14.9
2 Unalloyed Ti ("Pure") 50A 50 40 14.9
3 Unalloyed Ti ("Pure") 65A 65 55 14.9
4 Unalloyed Ti ("Pure") 80A 80 70 15
5 Ti-6Al-4V13012016.4
6 Ti-5Al-2.5Sn12011516
7 Ti-0.15Pd504014.9
9 Ti-3Al-2.5V907013.1
10 Ti-11.5Mo-6Zr-4.5Sn1009014.9
11 Ti-0.15Pd352514.9
12 Ti-0.3-Mo-0.8Ni705014.9
13 Ti-0.5Ni-0.05Ru402514.9
14 Ti-0.5Ni-0.05Ru604014.9
15 Ti-0.5Ni-0.05Ru705514.9
16 Ti-0.05Pd504014.9
17 Ti-0.05Pd352514.9
18 Ti-3Al-2.5V-0.05Pd907015.3
19 Ti-3Al-8V-6Cr-4Zr-4Mo11511014.9
20 Ti-3Al-8V-6Cr-4Zr-4Mo-0.05Pd11511014.9
21 Ti-15Mo-2.7Nb-3Al-0.25Si11511014.9
23 Ti-6Al-4V ELI11511016.3
24 Ti-6Al-4V-0.05Pd13012016.4
25 Ti-6Al-4V-0.5Ni-0.05Pd13012016.4
26 Ti-0.1Ru504014.9
27 Ti-0.1Ru352514.9
28 Ti-3Al-2.5V-0.1Ru907013.1
29 Ti-6Al-4V-0.1Ru12011016.3
ASTM Grade Alloy Composition Min. Tensile (KSI) Min. Yield (KSI) Modulus of Elasticity (PSI-106)
1 Unalloyed Ti ("Pure") 35A 35 25 14.9
2 Unalloyed Ti ("Pure") 50A 50 40 14.9
3 Unalloyed Ti ("Pure") 65A 65 55 14.9
4 Unalloyed Ti ("Pure") 80A 80 70 15
5 Ti-6Al-4V13012016.4
6 Ti-5Al-2.5Sn12011516
7 Ti-0.15Pd504014.9
9 Ti-3Al-2.5V907013.1
10 Ti-11.5Mo-6Zr-4.5Sn1009014.9
11 Ti-0.15Pd352514.9
12 Ti-0.3-Mo-0.8Ni705014.9
13 Ti-0.5Ni-0.05Ru402514.9
14 Ti-0.5Ni-0.05Ru604014.9
15 Ti-0.5Ni-0.05Ru705514.9
16 Ti-0.05Pd504014.9
17 Ti-0.05Pd352514.9
18 Ti-3Al-2.5V-0.05Pd907015.3
19 Ti-3Al-8V-6Cr-4Zr-4Mo11511014.9
20 Ti-3Al-8V-6Cr-4Zr-4Mo-0.05Pd11511014.9
21 Ti-15Mo-2.7Nb-3Al-0.25Si11511014.9
23 Ti-6Al-4V ELI11511016.3
24 Ti-6Al-4V-0.05Pd13012016.4
25 Ti-6Al-4V-0.5Ni-0.05Pd13012016.4
26 Ti-0.1Ru504014.9
27 Ti-0.1Ru352514.9
28 Ti-3Al-2.5V-0.1Ru907013.1
29 Ti-6Al-4V-0.1Ru12011016.3
Last edited by cortc; 08-17-2004 at 05:09 PM.
#53
Registered User
Thread Starter
Join Date: Mar 2004
Posts: 1,401
Likes: 0
Received 0 Likes
on
0 Posts
Most of the grades are of alloyed type with various additions of for example aluminum, vanadium, nickel, ruthenium, molybdenum, chromium or zirconium for the purpose of improving and/or combining various mechanical characteristics, heat resistance, conductivity, microstructure, creep, ductility, corrosion resistance etc. etc.
Palladium (Pd) and ruthenium (Ru), Nickel (Ni) and molybdenum (Mo) are elements which can be added to the pure titanium types in order to obtain a significant improvement of corrosion resistance particularly in slightly reducing environments where titanium otherwise might face some problems due to insufficient conditions for formation of the necessary protective oxide film on the metal surface. The formation of a stable and substantially inert protective oxide film on the surface is otherwise the secret behind the extraordinary corrosion resistance of titanium .
The mechanical properties of commercially pure titanium are in fact controlled by "alloying" to various levels of oxygen and nitrogen to obtain strength levels varying between approximately 290 and 550 MPa. For higher strength levels alloying elements, e.g. Al and V have to be added. Ti3Al2,5V has a tensile strength of minimum 620MPa in annealed condition and minimum 860 MPa in the as cold worked and stress relieved condition. The CP-titanium grades are nominally all alpha in structure, whereas many of the titanium alloys have a two phase alpha + beta structure. There are also titanium alloys with high alloying additions having an entire beta phase structure. While alpha alloys cannot be heat treated to increase strength, the addition of 2,5% copper would result in a material which responds to solution treatment and ageing in a similar way to aluminum-copper.
Palladium (Pd) and ruthenium (Ru), Nickel (Ni) and molybdenum (Mo) are elements which can be added to the pure titanium types in order to obtain a significant improvement of corrosion resistance particularly in slightly reducing environments where titanium otherwise might face some problems due to insufficient conditions for formation of the necessary protective oxide film on the metal surface. The formation of a stable and substantially inert protective oxide film on the surface is otherwise the secret behind the extraordinary corrosion resistance of titanium .
The mechanical properties of commercially pure titanium are in fact controlled by "alloying" to various levels of oxygen and nitrogen to obtain strength levels varying between approximately 290 and 550 MPa. For higher strength levels alloying elements, e.g. Al and V have to be added. Ti3Al2,5V has a tensile strength of minimum 620MPa in annealed condition and minimum 860 MPa in the as cold worked and stress relieved condition. The CP-titanium grades are nominally all alpha in structure, whereas many of the titanium alloys have a two phase alpha + beta structure. There are also titanium alloys with high alloying additions having an entire beta phase structure. While alpha alloys cannot be heat treated to increase strength, the addition of 2,5% copper would result in a material which responds to solution treatment and ageing in a similar way to aluminum-copper.
#54
Time of your life, kid...
Join Date: May 2004
Location: So Cal
Posts: 168
Likes: 0
Received 0 Likes
on
0 Posts
thanks.
btw, the only reason I put commercially pure in quotes is cause that's how it's referred to in the mil spec handbooks for metals. The type of Ti that I'm most familiar with is the grade 5 (6Al-4V), which seems to be the most common in various aerospace (civilian and mil) applications. Sometimes I get a little dissapointed when I try to find hardware in the real world (gotta keep reminding myself that the bolts I use at work start above the strength of "grade 10" commercial hardware, and go up from there...)
you wouldn't happen to know the spec for the steel used in the stock lugs, would you?
btw, the only reason I put commercially pure in quotes is cause that's how it's referred to in the mil spec handbooks for metals. The type of Ti that I'm most familiar with is the grade 5 (6Al-4V), which seems to be the most common in various aerospace (civilian and mil) applications. Sometimes I get a little dissapointed when I try to find hardware in the real world (gotta keep reminding myself that the bolts I use at work start above the strength of "grade 10" commercial hardware, and go up from there...)
you wouldn't happen to know the spec for the steel used in the stock lugs, would you?
#55
Registered User
Thread Starter
Join Date: Mar 2004
Posts: 1,401
Likes: 0
Received 0 Likes
on
0 Posts
I am looking for the specs on the stock ones, as soon as I have will post...
Well been testing the car for a few days under different conditions and load and the bolts have done very well... Absolutely no problems and they are very strong; I can feel the difference with them on and with the new lighter wheels things should really start feeling good...
Well been testing the car for a few days under different conditions and load and the bolts have done very well... Absolutely no problems and they are very strong; I can feel the difference with them on and with the new lighter wheels things should really start feeling good...
#58
Registered User
Thread Starter
Join Date: Mar 2004
Posts: 1,401
Likes: 0
Received 0 Likes
on
0 Posts
I am finalizing pricing and will post once I have everything squared away... The production ones will have forged heads rolled threads and they will be heat treated, even stronger than the prototype set...
The lugs bolts have speed starters on them for function, they also look really cool and if you ever use open ended lug nuts won’t ever rust or corrode…
The lugs bolts have speed starters on them for function, they also look really cool and if you ever use open ended lug nuts won’t ever rust or corrode…
#59
Sounds like an interesting project, nice work. I'm curious though, under what kind of situations do lug nuts fail and how do these failures manifest themselves? Is it catastrophic, like a wheel coming off on a highway, or somehting recoverable. If one fails can it be easily replaced? Or does continued operation affect other parts?
#60
Registered User
Thread Starter
Join Date: Mar 2004
Posts: 1,401
Likes: 0
Received 0 Likes
on
0 Posts
All wheel lug bolts can fail but they usually fail independently; one at a time... The only way a wheel is coming off is if you hit something really hard (Really hard as in major damage to other components as well...) and even then it usually comes of at the spindle or the complete suspension assembly comes off...
If one fails it can easily be replaced and you can buy them individually if required...
These will be basically as strong as the OEMs while being much lighter and corrosion resistant...
If one fails it can easily be replaced and you can buy them individually if required...
These will be basically as strong as the OEMs while being much lighter and corrosion resistant...
#62
GA RX8 Club Member
Join Date: Aug 2004
Location: Cumming GA
Posts: 303
Likes: 0
Received 0 Likes
on
0 Posts
Not sure if this has been mentioned before, but a google search for "Titanium lug nut" shows this link:
http://www.mettec.com/latemodel.htm
Specific RX8 stud size may be an issue here (I have no idea what size is needed), but off the shelf could be an alternative to custom titanium lugs...
http://www.mettec.com/latemodel.htm
Specific RX8 stud size may be an issue here (I have no idea what size is needed), but off the shelf could be an alternative to custom titanium lugs...
#69
Registered User
Thread Starter
Join Date: Mar 2004
Posts: 1,401
Likes: 0
Received 0 Likes
on
0 Posts
#71
Registered User
Thread Starter
Join Date: Mar 2004
Posts: 1,401
Likes: 0
Received 0 Likes
on
0 Posts
I recommend some nice lightweight forged chromoly or aluminum open or closed ended lug nuts... The Kyokugen are very good and a set runs about U$49.00 + shipping, for those who don't want the hassle of getting them I can hook them up...
Here is a write-up on the Kyokugens:
https://www.rx8club.com/series-i-wheels-tires-brakes-suspension-55/kyokugen-lug-nuts-installed-29177/
Here is a write-up on the Kyokugens:
https://www.rx8club.com/series-i-wheels-tires-brakes-suspension-55/kyokugen-lug-nuts-installed-29177/
#72
Absolute Rotary Madness
Join Date: Mar 2004
Location: Thessaloniki, Greece
Posts: 1,291
Likes: 0
Received 0 Likes
on
0 Posts
pardon my english but when you say '...I can hook them up...' you mean you'll include the lug nuts in the group buy, for all those that believe in your projects
Thread
Thread Starter
Forum
Replies
Last Post
hufflepuff
Series I Wheels, Tires, Brakes & Suspension
6
05-30-2016 10:45 AM
duworm
Series I Wheels, Tires, Brakes & Suspension
1
10-01-2015 04:57 PM
GranTouTou
Series I Wheels, Tires, Brakes & Suspension
0
09-30-2015 06:11 AM