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Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Cam and valvetrain longevity....??? low duration high lift... (https://www.offshoreonly.com/forums/general-q/341258-cam-valvetrain-longevity-low-duration-high-lift.html)

Full Force 09-22-2016 10:39 AM
Wonder if bob thought I wanted to spin 5500?? I have sheet I faced to him at home, said I wanted 700@6000
Originally Posted by MILD THUNDER (Post 4484020)
With that info, now keep in mind, that was with a flow cfm, of an average aftermarket bbc head. If I was to go off AFR"s advertised numbers, for the 325 CNC ported head, the program would show for tims 540,

242/248 duration at .050, for a 5500RPM max engine combo. Tim has 241/246. Pretty darn close right? By looking at his dyno sheet, would it be safe to say, his engine was about done making power around 5500?

Maybe its just a coincidence. Or, maybe this program, is halfway accurate.

MILD THUNDER 09-22-2016 10:39 AM
How about that engine in the article SB posted. 502ci, afr 325's, looking to make max power at 6000rpm. It actually peaked at 6200, but....using a tight lash setup, program says

245/252 @ .050.

That engine, had a 245/250 solid.

Full Force 09-22-2016 10:44 AM
Sooooo... More cam needed...

MILD THUNDER 09-22-2016 10:49 AM
Originally Posted by Full Force (Post 4484034)
Sooooo... More cam needed...
Its just a software program, and we all know how computer programmed engine builds can go. At the end of the day, you're exact combo, was spec'd from a combination of software, and gathered data. Problem occures, when you're relying on second hand data, to spec' engines for someone. There's a ton of factors involved.

Its still best to validate things on an engine dyno, making changes 1 at a time. Thats engine development.

Eliminated572 09-22-2016 10:52 AM
More duration, Timothy, more duration.

Full Force 09-22-2016 11:24 AM
That's what she said haha

Originally Posted by Eliminated572 (Post 4484037)
More duration, Timothy, more duration.

Eliminated572 09-22-2016 12:32 PM
Originally Posted by Full Force (Post 4484051)
That's what she said haha
At least its not short on lift AND duration :drink:

getrdunn 09-22-2016 12:40 PM
Originally Posted by MILD THUNDER (Post 4484025)
you confused me. Its still morning here. Im not following
Joe i just looked at the difference in 502 and 540 which is apprx 8%. Looking at the specs of solid cam in 502 build that was posted and added the 8% into cam numbers. For chits and grins to see what it software/program would show. Just throwing 8% more cam at than the 502.

mike tkach 09-22-2016 03:56 PM
crane 139651 244/[email protected] .632 lift.just information,nothing more nothing less.edit in 114 lsa

mike tkach 09-22-2016 04:20 PM
or 5 lbs boost and then your troubles will begin,drives,transmissions crapping every weekend.pick your poison tim!


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