Cam and valvetrain longevity....??? low duration high lift...
#411
Gold Member
![](https://www.offshoreonly.com/forums/images/icons/gold_member_star.gif)
Thread Starter
Join Date: Oct 2005
Location: Olmsted Falls,Ohio Marblehead,Oh
Posts: 11,636
Likes: 0
Received 209 Likes
on
133 Posts
![Default](/forums/images/icons/icon1.gif)
Wonder if bob thought I wanted to spin 5500?? I have sheet I faced to him at home, said I wanted 700@6000
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.
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.
![Full Force is offline](/forums/images/statusicon/user_offline.gif)
#412
Registered
![Default](/forums/images/icons/icon1.gif)
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.
245/252 @ .050.
That engine, had a 245/250 solid.
![MILD THUNDER is offline](/forums/images/statusicon/user_offline.gif)
#414
Registered
![Default](/forums/images/icons/icon1.gif)
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.
Its still best to validate things on an engine dyno, making changes 1 at a time. Thats engine development.
![MILD THUNDER is offline](/forums/images/statusicon/user_offline.gif)
#418
Registered
![Default](/forums/images/icons/icon1.gif)
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.
Last edited by getrdunn; 09-22-2016 at 04:09 PM.
![getrdunn is offline](/forums/images/statusicon/user_offline.gif)
#419
Registered
![Default](/forums/images/icons/icon1.gif)
crane 139651 244/[email protected] .632 lift.just information,nothing more nothing less.edit in 114 lsa
Last edited by mike tkach; 09-22-2016 at 04:06 PM.
![mike tkach is offline](/forums/images/statusicon/user_offline.gif)
#420
Registered
![Default](/forums/images/icons/icon1.gif)
or 5 lbs boost and then your troubles will begin,drives,transmissions crapping every weekend.pick your poison tim!
![mike tkach is offline](/forums/images/statusicon/user_offline.gif)