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Cam selection
Looking at replacing my hp500 crane 611 cam. I want to replace with another crane. I don't want the high idle or reversion issues like I have with the 611 but don't want to give up any hp. Who does. What would you guys suggest 781 731 791???? What your thoughts? Anyone tried any of these already with good results? Everything is stock carb hp500 with the taller risers
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525EFI cam. Its a 741 with a 114 lob sep
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I thought the later tall risers got rid of the reversion on the HP500 ? They are pretty damn tall.
http://www.cpperformance.com/images/...e/15730_1_.jpg |
Those are the tails I have and still sucked some water at idle Idle had to be at 800 or better and it helped but seems like a band aid to me Want to use a cam thats not so prone and worrisome at idle but makes the same power any ideas
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See post 2 !
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Originally Posted by Griff
(Post 4397350)
525EFI cam. Its a 741 with a 114 lob sep
Originally Posted by mike tkach
(Post 4397494)
See post 2 !
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Ok so I looks like the 741 is a good option I'll check it out thanks a bunch
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Originally Posted by dvalen11
(Post 4397587)
Ok so I looks like the 741 is a good option I'll check it out thanks a bunch
Don't know the Crane # for the 525EFI cam but its posted somewhere on OSO. |
i was just looking at the crane catalog and I see 741 does not have the 114 lsa Oddly enough I was waiting to hear back from bob madera on a quote and he call today and is working something up for a cam so will see what he comes up with anyone have a part number for the 525efi cam?
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16HR00004 I called crane a couple weeks ago and they told me I could get them direct, 440$ was the price I think.
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Originally Posted by dvalen11
(Post 4397683)
i was just looking at the crane catalog and I see 741 does not have the 114 lsa Oddly enough I was waiting to hear back from bob madera on a quote and he call today and is working something up for a cam so will see what he comes up with anyone have a part number for the 525efi cam?
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Originally Posted by Black Baja
(Post 4397715)
Bob could have a 525 copy ground at a much better price... If it was me I would take advantage of his expertise.
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quoting myself:
Originally Posted by SB
Crane 741
Intake Exhaust 296° at .004” 304° at .004” 288° at .006" 296° at .006" 234° at .050" 242° at .050" 204° at .100” 212° at .100” 154° at .200" 163° at .200" .359” lobe lift .372” lobe lift .610" valve lift with 1.7 .632" valve lift with 1.7 + .022” ICL 107° ECL 117° 112° LSA =================================== Merc 500EFI Gen VI #169621 Grind#HR-292-2S-14 IG 292º, 298º at .004” 284º, 290º at .006” 230º, 236º at .050” 150º, 156º at .200” Lift with 1.7 rocker .598” , .610” ICL 109 , ECL 119 LSA 114 525 EFI Crane #16HR00004 ? 298º/306º @ .004" 236º/244º @.050" .610"/.632" Lift Valve 114º LSA ===================================== APBA Cam for 8.1L Vortec Crane #268761 292, 298 @ .004” 230, 236 @ .050” .598”, .610” Lift with 1.7 114 LSA 109ICL/119ECL Note: Same as 500EFI but 8.1L’s Firing Order |
Comp cams now offering a cam upgrade for the 525 EFI merc engine. Anyone tried it yet? List price 399.68
http://news.compperformance.com/wp-c...I-Camshaft.pdf |
Originally Posted by Black Baja
(Post 4397715)
Bob could have a 525 copy ground at a much better price... If it was me I would take advantage of his expertise.
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Originally Posted by MILD THUNDER
(Post 4397752)
Comp cams now offering a cam upgrade for the 525 EFI merc engine. Anyone tried it yet? List price 399.68
http://news.compperformance.com/wp-c...I-Camshaft.pdf |
Originally Posted by Mr Maine
(Post 4397757)
Mild, I looked at those. I wonder if they are the 8620 steel?
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Originally Posted by Mr Maine
(Post 4397756)
I'm not complaining but I just bought cams off him and paid more than that. But he also spent time with me customizing a cam for my motors so it was worth it.
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Originally Posted by MILD THUNDER
(Post 4397766)
How much power did you end up making ?
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Originally Posted by MILD THUNDER
(Post 4397752)
Comp cams now offering a cam upgrade for the 525 EFI merc engine. Anyone tried it yet? List price 399.68
http://news.compperformance.com/wp-c...I-Camshaft.pdf |
Originally Posted by Griff
(Post 4397833)
Interesting. It looks more like a VERY close copy than an actual upgrade. Can't be much of a change since no ECU change is needed.
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^^^ You should use a 651 cam Mike , there`s 2 for sale not too far away, probably withing reach
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the 651 is to much cam for this build.
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I believe the 525efi cam , even though on a 114lsa, has more overlap than a HP500 cam. I dont have the info with me on that. But Im pretty sure it does.
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Originally Posted by Mr Maine
(Post 4397757)
Mild, I looked at those. I wonder if they are the 8620 steel?
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Originally Posted by Black Baja
(Post 4397885)
I would be willing to bet its a 5150 cam core.
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Originally Posted by Mr Maine
(Post 4397899)
We pulled a comp roller out of a friends 454 recently 226/234 duration at around .600 lift and there was signs of spalling on some of the lobes. Although the cam worked well, he is considering going to a crane 731.
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I believe a good core material is one thing, but a good core material that has been ground past its hardness treatment, can be an issue. Kind of like crankshafts.
Something basic like a HP500 cam, 525efi cam, shouldnt need stupid spring pressures to keep the valvetrain stable. The crane stuff has very gentle lobes. |
Originally Posted by Black Baja
(Post 4397902)
I'd be willing to bet it was a 5150 core. Comp isn't really know for using the best materials available. The Crane Cams are the real deal.
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Originally Posted by MILD THUNDER
(Post 4397904)
I dont know about that 525 cam, but yea, and thats the reason alot of comps basic hydraulic roller cams are quite a bit less money, like in the 300 dollar range. You arent gonna get a 8620 or 9310 cam for 300 dollars.
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Originally Posted by Black Baja
(Post 4397916)
I personally would spend the couple extra bucks on a billet cam regardless of how radical the lobes are.
Lunati, howards, comp, and others all use austempered cores , hence their price of 275-300 a cam. I know lunati will grind any of those cams on a billet core for an upcharge. I would bet there are tens of thousands of austemempred cores out there doijg ok on the basic bbc ....heck, lots of guys i know are worried about getting an 8620 cam core, but stil running a cast cam gear timing set |
Memory refresh time.
Remember way back when all those Crane's where breaking ? The cam literally broke just before the dist gear. I remember a heat treat difference between those breaking and not, but can't remember if there was a core difference. |
Originally Posted by SB
(Post 4397931)
Memory refresh time.
Remember way back when all those Crane's where breaking ? The cam literally broke just before the dist gear. I remember a heat treat difference between those breaking and not, but can't remember if there was a core difference. |
^^^^Before people get worried about crane, they fixed that issue way back then too.^^^^
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Originally Posted by SB
(Post 4397931)
Memory refresh time.
Remember way back when all those Crane's where breaking ? The cam literally broke just before the dist gear. I remember a heat treat difference between those breaking and not, but can't remember if there was a core difference. |
i remember reading about the crane stuff breaking they cheapen up their heat treat process and materials I believe you can tell the difference by the color of the core between lobes they loss that traditional gold color on the cheap ones anyone know of a place to have my Gil tails lengthen on the inners near buffalo?
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Originally Posted by dvalen11
(Post 4397994)
i remember reading about the crane stuff breaking they cheapen up their heat treat process and materials I believe you can tell the difference by the color of the core between lobes they loss that traditional gold color on the cheap ones anyone know of a place to have my Gil tails lengthen on the inners near buffalo?
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I believe it does...but not 100% positive. The 8620 has the copper in between each lobe because of the heat treating used on the lobes.
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Here is a good post on materials and heat treat by Kip Fabre of Cam Motion:
http://ls1tech.com/forums/generation...l#post18547331 |
For the money you are looking at spending, why not have a custom cam ground and get something that you know will work and work with your electronics?
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