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Originally Posted by Black Baja
(Post 4364005)
Comp and Crane stuff are older lobes.Up until recently we didn't have hydraulic lifters that would support the higher lift cams. Now we do. About a year and a half ago I called everyone and there brother trying to find .700 + lift hydraulic lobe profiles. The only ones that had them were Bullet and Cam Motion. I highly doubt the larger companies are going to get into more exotic hydraulic cams for BBC I really don't think there is a big market for it. From what I've been told the LS market is really starting to pick up. And when you only need 1 cam core on the shelf to make whatever cam you want (instead of a gazillion) it's a no brainer (business wise) what to focus on.
I think you dont see big lobe hydraulics much even today, because most guys wanting big lift, dont want a hydraulic, based on experience that they really dont hold up well in an endurance application, even with modern lifters. Kind of like why nobody is making 4 5/8 nodular cranks. Whos running +700 lift hydraulic roller cams successfully in the marine offshore stuff, even with modern lifters ? Not talking about a dyno pull, or race engine, talking poker run or pleasure engines ? I hoestly dont know. I know of a few who tried it, even with the high end morels , and ended up going back to solids , in bigger power applications. |
I have a serious question how much difference does 25CI actually make? like 540 vs 565?
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Originally Posted by MILD THUNDER
(Post 4363987)
Here's a look at comp's master lobe profiles they grind from. Page 16 is their marine grinds. They aren't offering anything in .650 lift with a 1.7 rocker, until the duration gets up to 254 range. In the 240* range, their "High lift" profile, is a .360 lobe/.612 valve lift. Seems like them and crane, are generally on the same page with lobe sizes for basic bbc marine/endurance stuff. Maybe the independent cam guys know some things they don't about duration vs lobe size, spring life, and so on. Possibly having in house spintrons, and grinding machines, might be a benefit to designing cams for all different applications, I would assume.
http://www.compcams.com/Technical/Ca...obeCatalog.pdf So.....if you call one of 2 'higher up' people in Comp Cams, you will more likely get another recomendation than the rest of the phone help and what is recomended in the catalog. |
If you have the cyl head and induction system for it.... alot.
How do you feel about the difference of a 540 vs a 572 ? |
Originally Posted by Full Force
(Post 4364008)
if you don't have Inconel the "might be for sale valves" BETTER be for sale or your gonna have some issues soon....
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Originally Posted by SB
(Post 4364019)
If you have the cyl head and induction system for it.... alot.
How do you feel about the difference of a 540 vs a 572 ? |
Originally Posted by Full Force
(Post 4364008)
if you don't have Inconel the "might be for sale valves" BETTER be for sale or your gonna have some issues soon....
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1 Attachment(s)
I have ..... twice.....only have a pic of one saved... here is second time after I didn't learn from first failure...
[ATTACH=CONFIG]546312[/ATTACH]
Originally Posted by 14 apache
(Post 4364025)
Just asking how many people had a quality stainless exhaust valve fail? He does only have a 22' boat. I had severe duty stainless valves in my twin turbo small block with no issues at 1800-1900 exhaust temp. Around 1000hp.
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What brand valves? That thing is fubar
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Pay a little now or a lot later.
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