Author Topic: Those "new" summit fe HYD roller cams.  (Read 412 times)

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DuckRyder

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Those "new" summit fe HYD roller cams.
« on: April 12, 2026, 03:11:34 PM »
Am i missing something here?

  • The numbers don't jive on the Wallace calculator?
  • All the lobes from 212@.050 to 248@.050 are .587 lift?

For instance the HR 3 / Summit 8917

In order to get the numbers it has to be 279 advertised on the intake and a 108.5 ICL (cam card 278/107)

While  realize that its very possible to have multiple lobes of the same lift with different durations, that seems pretty weird for all the lobes in the line to be the same lift and of 7 different durations. I don't really recall having seen that in other cam lines....

Any thoughts on this?
Robert

galaxiex

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Re: Those "new" summit fe HYD roller cams.
« Reply #1 on: April 12, 2026, 03:46:30 PM »
I've found Summit sometimes makes or has, errors in some of their technical descriptions.

May not be Summit's fault... might be the tech sheet/specs from the manufacturer.
Seems like someone doesn't proofread those things sometimes...
Every 20 minute job is 1 broken bolt away from becoming a 3 day ordeal.

mygasser

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Re: Those "new" summit fe HYD roller cams.
« Reply #2 on: April 12, 2026, 04:28:30 PM »
i'll let you know how it goes later this year, i've got one on the way that i ordered a couple days ago. i say later this year but it depends how the temporary (used) 360 runs when we fire it this week. if it's ok it'll go in my gasser til the end of the season, if not i'll be building up the 390 a bit sooner, lol.
neil.
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blykins

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Re: Those "new" summit fe HYD roller cams.
« Reply #3 on: April 12, 2026, 05:32:24 PM »
One guy is designing the lobes and they have a new in-house Landis grinder. 
Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
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DuckRyder

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Re: Those "new" summit fe HYD roller cams.
« Reply #4 on: April 13, 2026, 06:49:04 AM »
So it seems Brian Nutter is the guy designing the lobes.(cant find a ton about him)

At least where they are talking about LS cams they claim the billets are US made and that the Landis produces a very good and accurate finished lobe. (who else is using those? Comp?, Howards?) Again talking about "PRO LS" cams its sounds like they are even machining the billets and doing the hardening.

Anyway... somewhat intriguing if true.
Robert

blykins

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Re: Those "new" summit fe HYD roller cams.
« Reply #5 on: April 13, 2026, 08:05:01 AM »
It is Brian Nutter.  I've competed with him in the cam challenge stuff.

All of your higher end cam grinders will have a CNC grinder like that.

Having experience in a specific engine family is what gives you a leg up with cam stuff.   Just my opinion, but it's hard to pop out a line of cams when you've never built/dyno'd a specific engine before.  Lots of different aspects when you look at valvetrain weights between cylinder heads, valve sizes, displacements, etc.
Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
Custom Roller & Flat Tappet Camshafts
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www.customfordcams.com
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DuckRyder

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Re: Those "new" summit fe HYD roller cams.
« Reply #6 on: April 13, 2026, 06:22:10 PM »
Completely agree with you Brent, i just find new stuff for the FE interesting, particularly not so racy stuff.

Most of these seem to be aimed at stockish engines because they talk about things like "stock heads", "stock pistons", which makes sense for Summit. I do feel like  got some things right for the "typical fe" like the increased split in durations which is probably the right direction for most OE heads.

The other thing is the math doesn't math on the cam cards, as mentioned this could just be a mistake, but every one I've tried to run the numbers on has not come up matching the cam card. That brings questions of course, and is IME very atypical.

Robert

blykins

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Re: Those "new" summit fe HYD roller cams.
« Reply #7 on: Today at 03:59:25 AM »
I don’t like quick moves on heavy valved engines.  Would have to put a lobe on a doctor to see 110% what’s going on, but in a lot of cases the HI is a decent indicator of how quick things are. 

I feel like a lot of the Ford stuff is lumped together, even saying BBF/FE on their website. 
Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
Custom Roller & Flat Tappet Camshafts
www.lykinsmotorsports.com
brent@lykinsmotorsports.com
www.customfordcams.com
502-759-1431
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My427stang

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Re: Those "new" summit fe HYD roller cams.
« Reply #8 on: Today at 09:06:38 AM »
I 100% agree with Brent

In the end, assuming they hit their numbers, quality is good, and the cores are available etc, IMO these are certainly a little better than most of the common off the shelf cams.  No idea why their numbers are off, but you are correct.  Could be an asymmetric lobe, differences in putting a lobe family on an FE core, or just bad documentation or a combo of all of it. 

However, with these cams for the discount, you give up lift, which likely drives some spring choice changes as well as the obvious flow loss.  You give up some seat-to-seat timing, which with a normal retainer and 3/8 valves will want some extra pressure.   What I don't like is you have to go small to get overlap low enough to have decent vacuum on a street build, it'd be nice to have some wider LSA options. 

Assuming the lobes are controllable, some spread on those bigger cams would be better for a stroker but given the lift and seat timing it'll still be a power cost over a custom.  Saving 200 bucks is 200 bucks, but it comes with a cost.

On the flip side, there seems to be some decent split, good for stock or TFS heads, although maybe a bit excessive on a couple.

I would be hard pressed when digging deep into all the other blueprinting to recommend a generic cam, but if quality and availability holds, I can see a market for these





« Last Edit: Today at 09:19:17 AM by My427stang »
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Ross
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Barry_R

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Re: Those "new" summit fe HYD roller cams.
« Reply #9 on: Today at 11:57:50 AM »
So it seems Brian Nutter is the guy designing the lobes.(cant find a ton about him)

Brian is a very sharp dude.  He has a lot of years in the industry - although little direct FE experience.
H put in a lot of time at Wiseco doing pistons before moving to Summit.