Are titanium valve locks worth it?
#2785045
06/13/20 04:51 PM
06/13/20 04:51 PM
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Joined: Jan 2003
Posts: 7,471 Minnesota
Hemi_Joel
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I'm ordering new springs, retainers and locks for my early Hemi in the Drag Week hot rod. Looking for 8000 rpm capability. Comp recommends their tool steel retainer over Ti for this application due to durability and they are only a couple grams heavier.
But how about the locks? Steel locks weigh 8.5 grams vs. Ti locks at 4.5 grams for set.
Other than cost, is there any drawback to Ti?
Will 4 grams per valve make a difference?
Thanks, Joel
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Are titanium valve locks worth it?
[Re: 1969ronnie]
#2785062
06/13/20 05:14 PM
06/13/20 05:14 PM
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Joined: Jan 2003
Posts: 7,471 Minnesota
Hemi_Joel
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2.205" TI intake valve 102g 1.800" SS exhaust valve 111g
exhaust pushrod 146g intake pushrod 138 g lifter pair with bar 294 g
Missle aluminum rocker arms 1.5 ratio I&E
I'm going to run the Comp dual cone springs 7245-16. Here is what comp cams tech said about the spring:
Johnathan Martin: They will seem very light for what you are used to. They are rated at 150 lbs @ 2.000" and 630 lbs @ 1.200". The spring rate is 600 lbs/in and coil bind is 1.115". 2020-06-12 14:47 Hemi Joel: You are right that seems light. Is there some characteristic in their design that allows them to perform better than what the pressures would indicate? 2020-06-12 14:49 Johnathan Martin: The conical design allows for this. How it works with this low of pressure is beyond my comprehension. But I have seen the data where they were tested on our most aggressive solid roller lobes up to 9000 rpm and they did not flinch at all.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Are titanium valve locks worth it?
[Re: Hemi_Joel]
#2785077
06/13/20 05:54 PM
06/13/20 05:54 PM
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Joined: Jan 2003
Posts: 14,479 So. Burlington, Vt.
fast68plymouth
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So. Burlington, Vt.
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Not what you’re asking but.......
If you look at the test Andy did on his 470 where he used those springs, he discovered the advertised spring loads were off a fair amount from the published specs.
They worked fine for him....... but the seat loads were much more “normal” for a roller than 150 on the seat.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Are titanium valve locks worth it?
[Re: fast68plymouth]
#2785094
06/13/20 06:49 PM
06/13/20 06:49 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Romeo MI
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My opinion is that you dont need them.. you can look at them when you get done on DW.. but there are plenty of guys that are running them.. when I was gonna run DW I set up my engine with TI locks and am still running them on the street EDIT If you dont float your valves you dont have any worries
Last edited by MR_P_BODY; 06/13/20 07:20 PM.
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Re: Are titanium valve locks worth it?
[Re: Hemi_Joel]
#2785114
06/13/20 07:54 PM
06/13/20 07:54 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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I would do everything possible to reduce weight. I wonder if the spring recommendation takes in to account the exhaust rocker’s size and polar moment with the roller and adjuster so far from the fulcrum. Im not saying it won’t work... I honestly don’t know. That being said, if you are using the same spring on the exhaust as you are on the intake, you are either over-springing the intake, or under-springing the exhaust. If this sounds wrong, let me know your opinions. I don’t have any real life experience with the early hemi, but this is the line of thinking with the one I’m putting together.
"use it 'till it breaks, replace as needed"
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Re: Are titanium valve locks worth it?
[Re: TRENDZ]
#2785174
06/13/20 10:15 PM
06/13/20 10:15 PM
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Joined: Jan 2003
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Hemi_Joel
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Trendz, this is completely unscientific, but the exhaust has less lift so it should balance out somewhat on the springs.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Are titanium valve locks worth it?
[Re: Hemi_Joel]
#2785197
06/13/20 11:29 PM
06/13/20 11:29 PM
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Joined: Jan 2003
Posts: 7,471 Minnesota
Hemi_Joel
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Andy, I just found and read your article, thanks. I'll defensively check installed pressures.
One disadvantage of the Ti locks is they are non magnetic.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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