Slant Six Forum :: Solid Roller Camshaft

FYI

I was at Oregon Cam this morning picking up some race oil from him and I asked Ken what was one of his bigger cam profiles for the .904 mopar lifter.

Grind #1543
intake 289* duration at .050" .647" with 1.5 .690" with 1.6 rocker arm ratio .026 valve lash
exhaust 289* duration at .050" .650" with 1.5 .693" with 1.6 rocker arm ratio .026 valve lash
lobe separation on this one is 108

Big cam with lots of lift.

Definitely not a lawn mower cam.

It was a flat tappet for the super x series lawn mower. Only sold in the Pacific Norhtwest.

Quote:

Definitely not a lawn mower cam.

What is this fascination with lawn mower cams?

But with our Slant 6 head there is only very small gains in any flow after .550 lift unless someone has found a new mystery head. So wouldn't be much easier on equipment and make just as much power to have the same duration and much lower lift than .697? Just wonderin!

I'm not putting a .800 " lift camshaft in my single cylinder, flat head, Brigs & Stratton lawn mower engine.

Sorry...this was just a little Kelso WA humor. I'm not putting a .800 " lift camshaft in my single cylinder, flat head, Brigs & Stratton lawn mower engine.

just some FYI how big OC can make a roller camshaft.

Author:	Dave M [ Fri May 10, 2024 11:22 am ]
Post subject:	Re: Solid Roller Camshaft
FYI I was at Oregon Cam this morning picking up some race oil from him and I asked Ken what was one of his bigger cam profiles for the .904 mopar lifter. Grind #1543 intake 289* duration at .050" .647" with 1.5 .690" with 1.6 rocker arm ratio .026 valve lash exhaust 289* duration at .050" .650" with 1.5 .693" with 1.6 rocker arm ratio .026 valve lash lobe separation on this one is 108 Big cam with lots of lift.

Author:	Greg Ondayko [ Fri May 10, 2024 12:50 pm ]
Post subject:	Re: Solid Roller Camshaft
Quote: FYI I was at Oregon Cam this morning picking up some race oil from him and I asked Ken what was one of his bigger cam profiles for the .904 mopar lifter. Grind #1543 intake 289* duration at .050" .647" with 1.5 .690" with 1.6 rocker arm ratio .026 valve lash exhaust 289* duration at .050" .650" with 1.5 .693" with 1.6 rocker arm ratio .026 valve lash lobe separation on this one is 108 Big cam with lots of lift. Is that one in a roller flavor or flat tappet variety? Thanks Dave & Ken!

Author:	Dart270 [ Sun May 12, 2024 12:49 am ]
Post subject:	Re: Solid Roller Camshaft
Gotta be flat tappet, but Dave can verify. Lou

Author:	slantzilla [ Sun May 12, 2024 5:02 am ]
Post subject:	Re: Solid Roller Camshaft
Definitely not a lawn mower cam.

Author:	hyper_pak [ Sun May 12, 2024 7:47 am ]
Post subject:	Re: Solid Roller Camshaft
Quote: Definitely not a lawn mower cam. What is this fascination with lawn mower cams?

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Solid Roller Camshaft https://slantsix.org/forum/viewtopic.php?t=67078	Page 7 of 8

Author:	Greg Ondayko [ Sun May 12, 2024 8:02 am ]
Post subject:	Re: Solid Roller Camshaft
People have grass to cut!

Author:	Dave M [ Sun May 12, 2024 8:53 am ]
Post subject:	Re: Solid Roller Camshaft
It was a flat tappet for the super x series lawn mower. Only sold in the Pacific Norhtwest.

Author:	Killer6 [ Sun May 12, 2024 10:39 am ]
Post subject:	Re: Solid Roller Camshaft
Quote: It was a flat tappet for the super x series lawn mower. Only sold in the Pacific Norhtwest. Here in Seattle East, it grows 4"+/day, & rarely has a chance to dry out. We need a huge mid-range torque curve, ...

Author:	Dave M [ Sun May 12, 2024 12:31 pm ]
Post subject:	Re: Solid Roller Camshaft
Well, anyone that know me, knows that I do everything to a slant six that you are not suppose do. With that being said my lawn mower is no different. I will be removing the flat tappet camshaft from the mower this winter and will be upgrading to a more aggressive roller camshaft. OC grind number #1542 296* intake 302* exhaust with .824 valve lift. This should provide more midrange power even suitable for the Seattle area.

Author:	Rick Covalt [ Sun May 12, 2024 1:20 pm ]
Post subject:	Re: Solid Roller Camshaft
But with our Slant 6 head there is only very small gains in any flow after .550 lift unless someone has found a new mystery head. So wouldn't be much easier on equipment and make just as much power to have the same duration and much lower lift than .697? Just wonderin!

Author:	slantzilla [ Sun May 12, 2024 5:52 pm ]
Post subject:	Re: Solid Roller Camshaft
Quote: Quote: Definitely not a lawn mower cam. What is this fascination with lawn mower cams? Try to keep up, anything with .550" or less lift belongs in a lawnmower.

Author:	slantzilla [ Sun May 12, 2024 6:12 pm ]
Post subject:	Re: Solid Roller Camshaft
Quote: But with our Slant 6 head there is only very small gains in any flow after .550 lift unless someone has found a new mystery head. So wouldn't be much easier on equipment and make just as much power to have the same duration and much lower lift than .697? Just wonderin! This is a guess, and ONLY a guess, but the longer you can keep the valve at or above optimum flow, the more power you can theoretically make.

Author:	Dave M [ Sun May 12, 2024 6:36 pm ]
Post subject:	Re: Solid Roller Camshaft
Sorry...this was just a little Kelso WA humor. I'm not putting a .800 " lift camshaft in my single cylinder, flat head, Brigs & Stratton lawn mower engine. just some FYI how big OC can make a roller camshaft.

Author:	Greg Ondayko [ Sun May 12, 2024 7:27 pm ]
Post subject:	Re: Solid Roller Camshaft
Quote: I'm not putting a .800 " lift camshaft in my single cylinder, flat head, Brigs & Stratton lawn mower engine. I think if you tried to do so, you would bend the valve on the head anyway!

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Author:	hyper_pak [ Mon May 13, 2024 6:17 am ]
Post subject:	Re: Solid Roller Camshaft
Quote: Sorry...this was just a little Kelso WA humor. I'm not putting a .800 " lift camshaft in my single cylinder, flat head, Brigs & Stratton lawn mower engine. just some FYI how big OC can make a roller camshaft. How big they can make Roller Cam or Flat Tappet? I am trying to keep up....