Ordering a custom cam soon
Ordering a custom cam soon I'm finally going to order a custom grind from comp and just want to check if I'm missing something or way off base here. I have seen results with very similar cams, just not the same lsa or with a centri.
Engine specs are 427 LSx with TEA 245 70cc heads w/ nitrous exhaust ports (290cfm at .6") and 104g super alloy hollow intake and 96g super alloy exhaust valves. v springs are .660 duals. Yella terra 1.7 rockers, 11/32 pushrods and morel 5290 lb lifters. Static cr is 9.6:1 and spinning an F1A to about 13 psi.
I am going with a 231/238 115 lsa 115 icl lsl/lxl grind. I have heard the lsl lobes are sweet with quality combos so I would like to take advantage of the extra lift. A lope at 800 rpm idle would be cool but I'm going for a good all around street cam and I feel like these valve events would do the job without giving up too much up top. I'm not too worried about top end because of the centri. Dynamic cr is about 7:1 so should be boost/pump friendly and also not kill bottom end that much plus the 4.5* overlap at .050" and where it's centered should help.
Is my v spring, valve weight and rockers sufficient for the lsl intake lobe? I would prefer not to change my valve springs every 5,000 miles.
Also something I was wondering is why the lxl is suggested for the exhaust with the lsl intake. Is it because there is about 200 psi on the backside of the valve when it starts to open so a slower ramp helps?
I posted this here because I have cathedral ports
Any help would be appreciated.
Engine specs are 427 LSx with TEA 245 70cc heads w/ nitrous exhaust ports (290cfm at .6") and 104g super alloy hollow intake and 96g super alloy exhaust valves. v springs are .660 duals. Yella terra 1.7 rockers, 11/32 pushrods and morel 5290 lb lifters. Static cr is 9.6:1 and spinning an F1A to about 13 psi.
I am going with a 231/238 115 lsa 115 icl lsl/lxl grind. I have heard the lsl lobes are sweet with quality combos so I would like to take advantage of the extra lift. A lope at 800 rpm idle would be cool but I'm going for a good all around street cam and I feel like these valve events would do the job without giving up too much up top. I'm not too worried about top end because of the centri. Dynamic cr is about 7:1 so should be boost/pump friendly and also not kill bottom end that much plus the 4.5* overlap at .050" and where it's centered should help.
Is my v spring, valve weight and rockers sufficient for the lsl intake lobe? I would prefer not to change my valve springs every 5,000 miles.
Also something I was wondering is why the lxl is suggested for the exhaust with the lsl intake. Is it because there is about 200 psi on the backside of the valve when it starts to open so a slower ramp helps?
I posted this here because I have cathedral ports
Any help would be appreciated. I wouldn't worry about Comp grinding the cam. Guys like Ed Curtis at Flowtech Inductions uses Comp to grind many of his custom cams (on his proprietary lobes of course), and if he's not worried about it, then neither should you. I think 99% of the time people blame Comp for the cam failure when in fact it was their own fault for not setting up the valve train properly, or not using the appropriate valve train components. If you're that hell bent against using Comp, have Kip Fabre custom spec the cam for you. Kip owns Cam Motion, which is another cam company.
Cam whine is 100% comps fault. The last thing I want is any doubt that the cam was cut wrong or may fail. Piece of mind is worth a few extra bucks.
https://ls1tech.com/forums/generatio...comp-cams.html
https://ls1tech.com/forums/generatio...comp-cams.html
I would spec something different with different lobes for that combination.
I like the push rod and lifter choice, but I use much different lobes with smoother ramps with roller rockers.
Their moment of inertia is much higher than a stock rocker arm and they really work best with smoother ramps.
I like the push rod and lifter choice, but I use much different lobes with smoother ramps with roller rockers.
Their moment of inertia is much higher than a stock rocker arm and they really work best with smoother ramps.
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Damn im glad i asked. Cam motion it is, they look bad *** and made next door. LA has got some serious LSx stuff goin on over there that i never knew about. Thanks again for your help.
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Verdad Gallardo I would spec something different with different lobes for that combination.
I like the push rod and lifter choice, but I use much different lobes with smoother ramps with roller rockers.
Their moment of inertia is much higher than a stock rocker arm and they really work best with smoother ramps.
I like the push rod and lifter choice, but I use much different lobes with smoother ramps with roller rockers.
Their moment of inertia is much higher than a stock rocker arm and they really work best with smoother ramps.
Can i take advantage of my exhaust port flow to reduce exhaust duration, trying to limit overlap.
You guys who love to bash on Comp kill me. I trust guys like Brian Tooley, Ed Curtis, and Martin Smallwood more than I believe these internet heros who have nothing better to do than bash Comp. Tooley said it best in that Comp thread when he said it's unmatched valve train parts and valve trains that are not setup right that's causing these issues. Not saying Comp is perfect, but the majority of these issues are at the fault of the backyard mechanic.
You guys who love to bash on Comp kill me. I trust guys like Brian Tooley, Ed Curtis, and Martin Smallwood more than I believe these internet heros who have nothing better to do than bash Comp. Tooley said it best in that Comp thread when he said it's unmatched valve train parts and valve trains that are not setup right that's causing these issues. Not saying Comp is perfect, but the majority of these issues are at the fault of the backyard mechanic.
I really didn't mean to start a comp cam bash but its nice to know others opinions. I'm running a comp grind now but the lobes are very lazy and the main problem is my builder spec'ed it way over the top. It was based on the short block specs and didn't know the top end details or how the vehicle is driven.
That cam motion stage 3 blower cam shelf grind looks really sweet and close to what i think will be recommended.
I don't doubt that one bit. I've had nothing but great experience with Kip on here. He is one of the best in regards to all things cams and his customer service is probably next to none. Check out the Cam Motion website and you'll see he used several of the self cam names I came up with. It's great to have other companies we can go to in regards to getting cams and information on cams. With that said, I don't like all the internet nut swingers who just agree with everyone when it comes to bashing a company that has hundeds of thousands of more than happy customers. Mh personnal belief is that Comp is not at fault. I feel people try to run high lift and aggressive lobe designs without matching them with the proper valve train parts. Or, the valve train is not setup right. Like I said, just my opinion. I haven't had any issues with my Comp cam.
We are a dealer for Cam Motion as well, yes.
I do not wish to steal a sale from a vendor though and if Kip or someone at CM has already helped you then it sounds like you are on the right track.
I would be more than glad to help if it is asked of me.
I have my own way of specifying blower cams and my own tendencies. My centri grinds normally have 12-20 degrees of I/E duration split. I limit overlap with where I place the intake and exhaust centers.
The reason why I use more split is not due to exhaust flow, it has much more to do with where peak torque is made in regards to piston speed of the engine.
I do not wish to steal a sale from a vendor though and if Kip or someone at CM has already helped you then it sounds like you are on the right track.
I would be more than glad to help if it is asked of me.
I have my own way of specifying blower cams and my own tendencies. My centri grinds normally have 12-20 degrees of I/E duration split. I limit overlap with where I place the intake and exhaust centers.
The reason why I use more split is not due to exhaust flow, it has much more to do with where peak torque is made in regards to piston speed of the engine.
We are a dealer for Cam Motion as well, yes.
I do not wish to steal a sale from a vendor though and if Kip or someone at CM has already helped you then it sounds like you are on the right track.
I would be more than glad to help if it is asked of me.
I have my own way of specifying blower cams and my own tendencies. My centri grinds normally have 12-20 degrees of I/E duration split. I limit overlap with where I place the intake and exhaust centers.
The reason why I use more split is not due to exhaust flow, it has much more to do with where peak torque is made in regards to piston speed of the engine.
I do not wish to steal a sale from a vendor though and if Kip or someone at CM has already helped you then it sounds like you are on the right track.
I would be more than glad to help if it is asked of me.
I have my own way of specifying blower cams and my own tendencies. My centri grinds normally have 12-20 degrees of I/E duration split. I limit overlap with where I place the intake and exhaust centers.
The reason why I use more split is not due to exhaust flow, it has much more to do with where peak torque is made in regards to piston speed of the engine.
Thanks Martin, really appreciate that. I did go ahead with the boys over at cam motion and couldn't be happier. You guys who love to bash on Comp kill me. I trust guys like Brian Tooley, Ed Curtis, and Martin Smallwood more than I believe these internet heros who have nothing better to do than bash Comp. Tooley said it best in that Comp thread when he said it's unmatched valve train parts and valve trains that are not setup right that's causing these issues. Not saying Comp is perfect, but the majority of these issues are at the fault of the backyard mechanic.
I could care less what you think or who you trust. Who are you? I lost one motor(402 stroker when lobe wore out in 300 miles) and have seen 8 others fail in the last year because of their junk in three states in person and it was not user at fault or oil used in these motors. Not to mention the 10 cam installs I had to redo because of supercharger sounding COMP cam crap. I am not a hero at all or try to be if that was aimed at me. When you GET experience building LS motors like I have been doing since 97 then post like that. My suppliers no longer trust comp either. Many vendors feel the same on here which is documented everywhere and on other sights. You like Comp that is great. Don't go calling people names that assemble these motors because they don't agree with you.