[Z06] Titanium rods strength
#1
Titanium rods strength
I believe im going to have rod problems the motor is making 650 + 330 shot = bent rod ?? Does anyone have big motors with ti rods ,I haven't heard of bent rods being a problem ?
#2
Drifting
The last I remember hearing from Jason at Katech was that they had never seen a broken titanium rod. Most of the stress comes from RPM and not horsepower/torque. I wish all the guys that replaced their titanium rods with forged steel "Just to be safe" had sent their weak old titanium rods to me for disposal.
Gary
Gary
#3
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The last I remember hearing from Jason at Katech was that they had never seen a broken titanium rod. Most of the stress comes from RPM and not horsepower/torque. I wish all the guys that replaced their titanium rods with forged steel "Just to be safe" had sent their weak old titanium rods to me for disposal.
Gary
Gary
OP what are your power goals with this engine? how do you plan on getting there (n/a, FI)? just notice you said a shot. Well if it makes you feel any better we have run a 250 shot on the stock rods before with no issues to speak of.
Last edited by American Heritage; 07-25-2014 at 06:11 PM.
#4
The last I remember hearing from Jason at Katech was that they had never seen a broken titanium rod. Most of the stress comes from RPM and not horsepower/torque. I wish all the guys that replaced their titanium rods with forged steel "Just to be safe" had sent their weak old titanium rods to me for disposal.
Gary
Gary
#6
RPP dkGoodrich.com Tuned Z06 8.82 @ 161 Track World Record - YouTube
From what I've been told Jared uses stock rods and Mahle extreme duty pistons . Keeps rotating mass same as factory
From what I've been told Jared uses stock rods and Mahle extreme duty pistons . Keeps rotating mass same as factory
#7
Titanium rods
If you think you have more power it's just a matter of seat time , clutch and weight savings . It takes a while to iron it all out . You know that already lol . Sounds like its gonna be nasty
#8
I don't think anyone really knows what the Ti rods are good for.... Seems as if the engine builders just move to a steel rod at about 750 crank HP mark, or 8000 rpm. I had a conversation with a GM racing power train manager who has a great deal of experience with the LS7. Asked him flat out what power levels the rods are good for. He told he couldn't give me a definitive answer. Katech probably has a pretty good idea. They are well known for improving on the OE rod. I'd start there and find out what they have to say before going over the 750 mark.
#10
Stock rods
From all I've seen over the years at the shop . Use the stock rods with different rod bolts and change the pistons to the light weight mahal extreme duty style . Your good unless you want big power . We have a Camaro at the shop that takes a beating more than often and no problems with this set up on a ls7 . I've never seen one come through with a broken rod . Always rings or valve train related .
#11
Drifting
Gary
#12
My personal opinion is that if you have a heads/cam car and you are going to dump a 250 shot, you have a lot more to worry about before the rods become a concern. It may sound illogical but the most destructive stress that a rod sees is at TDC on the overlap and the problem is tension, not compression or bending stresses. I personally think that the stock rod bolts are pretty good but better bolts are always a source of cheap insurance. Running a lighter piston takes a lot of stress off the rod bolts at the same RPM and very few here actually raise their rev limit. However, I wouldn't raise the rev limit by 500 or more without changing the stock bolts. The rods themselves are one of the best things about our motors. GM didn't spend the money on them just because they were "Cool".
Gary
Gary
#13
I have forged pistons, I would be worried at even 150 shot without forged pistons and I have the k501 cam and erl superdeck block I'm not going over 7000 rpm ,so I think I'm safe . Thanks for all the input
#14
My first serious n20 motor was a small block ford . 3.900 stroke 4.130 bore . 9.5 deck block with grp 6.125 rods and venolia pistons . Bennett racing Yates sc1 heads and intake . Pro systems dominator and built by buck racing engines .. They are a pro mod builder . It had 3 kits . Two 200 foggers and a custom spray bar . Whew . It was hell on wheels literally ! N20 is a lot of fun . I also remember replacing pistons in the pits . A small plate system is very forgiving and easy to tune
#15
Good point on the TDC issue. IIRC the LS7 uses eccentric rod bearings for this very reason ('pinch' along the parting line at TDC).
Or in other words, what goes up must come down
Pistons are essentially cast and not expected to survive much above stock power levels. That being said, I certainly wouldn't want anything heavier in replacement.
Or in other words, what goes up must come down
Pistons are essentially cast and not expected to survive much above stock power levels. That being said, I certainly wouldn't want anything heavier in replacement.
#16
Burning Brakes
I would favor keeping the stock rods with a bushing and bolt upgrade and going with forged pistons. JE has a new line of LS slipper skirt pistons that will shave off about 40 grams of weight versus the factory cast pistons. They have put a lot of engineering into the LS series pistons to achieve good street manners too.
#17
JE is my default piston. For mild street builds, I tend to gravitate towards their SRP line. You can run a tighter bore clearance with the SRP, but they are still hell for stout. They do not have one for 4.125 bore though, unfortunately. The slipper skirt would be a good one for mild boost. -22 dish. I’m also a Speed Pro/Plasma Moly ring fan.
#18
JE is my default piston. For mild street builds, I tend to gravitate towards their SRP line. You can run a tighter bore clearance with the SRP, but they are still hell for stout. They do not have one for 4.125 bore though, unfortunately. The slipper skirt would be a good one for mild boost. -22 dish. I’m also a Speed Pro/Plasma Moly ring fan.
OP: Unless you're planning on your piston speed operating at 4000fpm+ all the time, I would worry more about your tune, pistons and rings than your rods.... That and the quality of electrical work hooking everything up
Keep us posted.
#19
Hey I had all that but a victor jr on a 70 vette , briancb1 !! And it was damn fast 13s (for the 80s) I have great mechanic ,jack at lethal performance adding a stand alone fuel sys. For the nitrous and she's done !
#20
Supremacy 1 car at a time
Will we're gonna use them on my friend car we'll go with 16psi on his D1 and spray 100 we're not sure it will handle it or not but we're planning to go with dragon slayer and coated pistons.