~whats the word on Dual Valve springs VS single Beehive Valve springs?????~
05-18-2008, 02:44 PM
#17
Registered User
However, being an aircraft mechanic and working with Ti daily in critical high stress, high wear, high temp -- high everything you can think of applications where critical and necessary, Ti is the metal of choice. And while I have seen the pics/threads of the Ti retainer failure, I think it is about as wide spread a deal (and equally overblown, no pun intended) as the CFM+ manifolds blowing up everywhere... I think the whole idea of Ti being inferior, or even dangerous, in this application is simply ludicrous and an idea much too overblown from singular incidences where we really don't know all the other surrounding and underlying facts. Well known brand name turbos blow up here all the time... so we should stop using them too??
No, Ti is perfectly safe and well suited to this application.
No, Ti is perfectly safe and well suited to this application.
05-18-2008, 04:51 PM
#18
DTR 1st Sergeant
It's a typical case of post hoc ergo propter hoc logic mistakenly applied to Ti as a material choice... fact is, an engine running Ti retainers is WAY more likely to get turned up & stomped on - hard! So there's a corresponding increase in the likelihood of parts failures.
05-18-2008, 08:01 PM
#20
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Well I have run some of the dual springs that are currently available...... All I will say is keep an eye on the inner springs, 40% of mine were broken within 20K miles! 
These were run on a very mild cam where lift was not an issue.
I have since gone to the F1 springs and have had no issues for over 60K miles.
Doug
These were run on a very mild cam where lift was not an issue.I have since gone to the F1 springs and have had no issues for over 60K miles.
Doug
05-19-2008, 01:05 PM
#21
Registered User
Just an FYI, greg's dual springs measured side by side with Dons were almost exactly the same pressures at installed height and 0.400" lift.
I don't buy the argument that the titanium won't last... I've read about the corvette owner that installed what he thought to be titanium retainers that didn't last. Aluminum looks alot like titanium and I imagine there are people out there selling them as the real deal. If you are unsure, run a bead blaster over a titanium retainer. If it's real, you will see lots of sparks...
I don't buy the argument that the titanium won't last... I've read about the corvette owner that installed what he thought to be titanium retainers that didn't last. Aluminum looks alot like titanium and I imagine there are people out there selling them as the real deal. If you are unsure, run a bead blaster over a titanium retainer. If it's real, you will see lots of sparks...
05-19-2008, 06:14 PM
#24
Registered User
Well I have run some of the dual springs that are currently available...... All I will say is keep an eye on the inner springs, 40% of mine were broken within 20K miles! These were run on a very mild cam where lift was not an issue.
I have since gone to the F1 springs and have had no issues for over 60K miles.
Doug
These were run on a very mild cam where lift was not an issue.I have since gone to the F1 springs and have had no issues for over 60K miles.
Doug
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