Why is that?
Originally Posted by NiklasFalk
(Post 1372146)
softer springs would be better in the long run
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because stiffer springs "push" lifter stronger agains camshaft, so it wears quicker. not something I´m worried about as I do 3k Miles a year.
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LOL
it doesnt exactly work like that
Originally Posted by AndrewG
(Post 1372258)
because stiffer springs "push" lifter stronger agains camshaft, so it wears quicker. not something I´m worried about as I do 3k Miles a year.
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your post have probably less value than my bad answer. Please explain
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If the springs are too light, they will let the valves bounce and slam into the seats which causes a lot of wear and damage.
There is a great thread here somewhere about all the valvetrain issues..
Originally Posted by AndrewG
(Post 1372261)
your post have probably less value than my bad answer. Please explain
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Originally Posted by d k
(Post 1372255)
Why is that?
The soft ST duals could most probably been enough in my case, but as mentioned, don't copy part of a design. When you have (good enough in your judgement) control of your valve movement, extra springs is just waste. |
So.. getting back to this before I order my things for my relatively low-rpm (~7800max) BP6D w 264 cams build, should I just avoid the ST light doubles and just buy the VS855s?
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I completely forgot about this thread and had already ordered supertech heavy doubles for my spare head. *ponder ponder*
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Originally Posted by albumleaf
(Post 1391622)
So.. getting back to this before I order my things for my relatively low-rpm (~7800max) BP6D w 264 cams build, should I just avoid the ST light doubles and just buy the VS855s?
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Originally Posted by psyber_0ptix
(Post 1391632)
I completely forgot about this thread and had already ordered supertech heavy doubles for my spare head. *ponder ponder*
So many 8200rpm + moments. Less than 20psi levels though. |
Any modification needed to use the stock retainers with the supertech duals? Quite a few failures reported with the ST Ti retainers in other applications. Don't feel like checking whatever I install every 5-10k to see if it's holding up.
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Originally Posted by albumleaf
(Post 1393693)
Any modification needed to use the stock retainers with the supertech duals? Quite a few failures reported with the ST Ti retainers in other applications. Don't feel like checking whatever I install every 5-10k to see if it's holding up.
They would bolt up, but I'm not sure if things would get damaged with the inner spring not held in place fully. It might rub or chatter against the outer spring. ST retainer https://cimg3.ibsrv.net/gimg/www.mia...3fda6db78c.jpg Oem BP05 retainer https://cimg6.ibsrv.net/gimg/www.mia...820085e270.jpg Side by side https://cimg9.ibsrv.net/gimg/www.mia...9ad6fc82fd.jpg |
Made custom steel retainers for my ST duals, but the cost was about 3x the Ti retainers.
Machine time is not cheap here. |
How do the Ti retainers fail. Do they deflect upwards, crack or just wear?
They are a good amount lighter than steel so they are attractive for anyone chasing revs like myself. |
The failure I've seen was due to wear, all the way through (only inner spring holding the valve), possibly due to not tight enough so the spring rotates against the retainer wearing the soft Ti.
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I've been running the VS855 for several thousand miles without issue. 18psi, 7800rpm.
Over reved once to 8000+, wasn't logging but wasn't that bad of a miss. No issues from that so far. Factory valves, keepers, etc. |
Originally Posted by NiklasFalk
(Post 1393808)
The failure I've seen was due to wear, all the way through (only inner spring holding the valve), possibly due to not tight enough so the spring rotates against the retainer wearing the soft Ti.
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Time for a necro-post. Lots of speculation above, but very little experience with the VS-855. Can I get an update from the people using the cheap Volvo springs? I'll buy the ST doubles if I have to, but I'd rather put that money towards a BE oil pump, tires, prostitutes or cocaine. Thanks
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I put some in about 4 weeks ago.
its a tired B6 port matched & polished general clean up of ports Genie headers 272/264 220/215@0.05" cams 10/9 lift CR10.5:1 MS2 max RPM 7500 running HLA's spring pressure recommended by manufacturer 66lbs initial reaction after running cams in again....smoother at low RPM. More vibrations at the top. But it seems to have smoothed out a little over a few weeks and a few high rpm runs. will not get a chance to dyno it as the engine now needs replacing. But unlikely because of the springs. that's as much as i can tell you. |
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