Those "new" summit fe HYD roller cams.

[DuckRyder]

Not withstanding Brents friends (Daniel?) findings, i agree with Ross and think that basically every one of them larger than the 8916 would probably be better on like a 113-115 and the jury is out on 8916.

The 8916 might be a nice street cruiser car/truck cam but you'd have to roll it back basically the entire advance for anything with compression and stock heads.

One of them is very very close (like within a degree) of the cam in my truck and i would not describe it as medium chop but at least i know how it would act (assuming i trust the numbers), still it would be better with more split and a wider lsa to keep the overlap in check....

Anyway. The guy i was talking to said he had e-mailed Nutter twice and not gotten a reply, so i guess answering any questions isn't in the marketing plan. In their other "pro" lines they have a wider selection so I guess there maybe "cough" "turbo" cams coming...

Custom is the answer if we want what we want...

At least they didn't off shore them, and choice is good...

[67xr7cat]

I change LSA based on overlap after lobe choices and what I need for customer and engine intent, not quite that simple, but easiest way to quickly explain it.  It can range from 108 to 115 on most builds.  However, on this one I wanted to see Summit's big cam spread to 114 or 115.  Can't really say "can you revise your entire cam for me" but I did expect maybe an option to spread centers on a special order.

As far as being money guys, some of the best parts are coming from this company, glad to see them make a little.  Trick Flow heads are owned by Summit Racing and their quality is fantastic and availability is good, although I sure wish they'd come back with their single 4 intake. As I said, I suspect either my question didn't get to where it needed to be or it's a stocking core problem, as you spread centers, the company has to stock semi-finiahed cores to meet that need, so maybe they don't see a need for the flexibility.

I am not against a can or electric pump if a customer wants it, but also have many on the street that are on resto cars that do not want any modern externals, and we can easily make 550 HP at well under 6000 and give them good vacuum by controlling overlap.  When you do that, it makes for a very happy street car, and if the head supports it, can make some big power.

Yes I understand it is not LSA per se that you are looking, but rather it is the byproduct of the timing events.  Reason you can do what you want is that you have good heads that don't need all that overlap to make power.  Maybe if they made a cam intended as part of a package with the TFS heads be different. Regardless of what Summit provides it sure does not look like they are being run by car guys. Seems they are very focused on the money and that is not a bad thing if they make parts we can use, but you are a long way from talking to someone who has the interest you are looking for.  Years ago when Joe Lunati ran Lunati cams you could get him on the phone and he would make it happen or tell you why you were wrong.  Now Lunati doesn't even make cams. Honestly I would not be surprised if the guy who designed the cams was contracted and whoever wrote the CNC program was too and they are long gone. Probably have some guy that puts the blank in the machine and only knows how to load a program and hit the go button. Call me cynical, but its all about money. 

[67xr7cat]

Not withstanding Brents friends (Daniel?) findings, i agree with Ross and think that basically every one of them larger than the 8916 would probably be better on like a 113-115 and the jury is out on 8916.

The 8916 might be a nice street cruiser car/truck cam but you'd have to roll it back basically the entire advance for anything with compression and stock heads.

One of them is very very close (like within a degree) of the cam in my truck and i would not describe it as medium chop but at least i know how it would act (assuming i trust the numbers), still it would be better with more split and a wider lsa to keep the overlap in check....

Anyway. The guy i was talking to said he had e-mailed Nutter twice and not gotten a reply, so i guess answering any questions isn't in the marketing plan. In their other "pro" lines they have a wider selection so I guess there maybe "cough" "turbo" cams coming...

Custom is the answer if we want what we want...

At least they didn't off shore them, and choice is good...

Don't take this the wrong way, but you cannot say with any certainty just by looking at the information on the website and a few of them don't have all that much overlap based on the seat timing. Those are some weird cams. Some of those lobes have a lot of lift for the duration.  What Ross is doing is the same thing the OEM's been doing since the 60's which is take a long duration and then tighten up the LSA to kill the overlap ad get some manors. 

[blykins]

Widening the LSA would kill the overlap. 

In addition, overlap at seat timing really doesn’t carry as much weight as .050” overlap.

[67xr7cat]

Doesn't "high performance" dictate a lumpy idle?

If we go back aways Isky ground everything on a 108 LSA and kept the intake and exhaust duration the same.  Said it gave the best performance.  Factory stuff like the 427 SFT cams had a bunch of duration and a 114 or 119 LSA.  Now take the CJ.  cam.  That lobe was used on the 351C CJ, 390GT,428CJ,429CJ and a few others.  Amazing how an OEM decided those lobes would work in all those different engines.

As I said you really have to look at value event and really really best is if you can look at the lift profile.  You can have two cams with the same LSA and duration, but be a lot different.
[/quote]

I would say that high performance doesn't always dictate a nasty idle sound.  You can have an absolute mild cam with a really good cylinder head and still make a lot of power. 

It's not just the OEM that makes universal cams, all the cam companies have been doing that for decades.   The same cam that's available for an FE is also available for a SBM or a Buick.  I'm just thankful that we've made leaps and bounds in technology since the 60's.  Unfortunately, a lot of guys still think a single pattern on a 108 is the ticket.  Actually, most people focus way too much on the LSA period.  It's like it's some magical number or something.

I had a guy email for a custom cam and said, "I don't care how you grind it, as long as it's on a 104 LSA". 

Show me that you don't know anything without telling me that you don't know anything.
[/quote]

LOL I was asking that "High performance cam" question tongue and cheek.  Next we will start using terms like "3/4 race cam". The whole LSA and duration numbers thing is just a way to dumb it down and make joe sixpack feel he knows how to pick a cam. A little knowledge certainly can be dangerous. Yes the whole industry been build around a few lobes that work decent. Comp cams Magnum or high energy are examples. I'd say really it comes down to what your goals are and how picky you are. Of course I know guys who are just happy if their old car runs down the road and don't break down. 

[67xr7cat]

Widening the LSA would kill the overlap. 

In addition, overlap at seat timing really doesn’t carry as much weight as .050” overlap.

I thought I said that widening the LSA kills the overlap. Sorry I said tightening it, but that is what I meant. Yes .050" has more effect and .200" even more, but I haven't seen a cam with a lot of seat timing work as well as one with less, but your the cam guy so I'll just go back to doing my work and stop wasting time here.

[blykins]

Widening the LSA would kill the overlap. 

In addition, overlap at seat timing really doesn’t carry as much weight as .050” overlap.

I thought I said that widening the LSA kills the overlap. Sorry I said tightening it, but that is what I meant. Yes .050" has more effect and .200" even more, but I haven't seen a cam with a lot of seat timing work as well as one with less, but your the cam guy so I'll just go back to doing my work and stop wasting time here.

On some larger, more aggressive solid rollers, it will become more apparent.  The seat duration will be short, but the .050" duration will be large.