Can someone calculate my hp?
#1
Registered
Thread Starter
Join Date: Jul 2004
Location: Stockholm, Sweden
Posts: 1,229
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
I have been trying to use desktop dyno but cant get it right...
The setup as follows:
Stock bottom 454 Gen V 330hp (1995)
Heads: GM Vortec 105cc CC, Large oval 230cc int ports, D shaped exh ports
Valves: 2.19int/1.88exh
Intake: Holley 300-42
Carb: Edelbrock 1410 750cfm
Cam: Comp Cams Extreme Marine CL11-236-4
Dur @ 0.50: 226int/236exh
Lift: 0.544int/0.547exh
Lobe: 112
Exhaust: Manifolds from GIL
Dry exhaust through transom, no mufflers
Complete MSD ignition
Rpm limit set at 5100rpm
K&N Air filter
That should be it.
Thanks!
![Frown](/forums/images/smilies/frown.gif)
The setup as follows:
Stock bottom 454 Gen V 330hp (1995)
Heads: GM Vortec 105cc CC, Large oval 230cc int ports, D shaped exh ports
Valves: 2.19int/1.88exh
Intake: Holley 300-42
Carb: Edelbrock 1410 750cfm
Cam: Comp Cams Extreme Marine CL11-236-4
Dur @ 0.50: 226int/236exh
Lift: 0.544int/0.547exh
Lobe: 112
Exhaust: Manifolds from GIL
Dry exhaust through transom, no mufflers
Complete MSD ignition
Rpm limit set at 5100rpm
K&N Air filter
That should be it.
Thanks!
Last edited by tomas_wallin; 06-09-2005 at 09:31 AM.
#2
Registered
Join Date: Jan 2001
Location: Holland MI
Posts: 3,140
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
I haven't got DT on my computer here at work but part of your problem may be that the compression ratio is going to be higher than stock due to the 105cc chambers on the vortec heads. A wild guess on c/r would be 8.5:1.
#4
Registered
Thread Starter
Join Date: Jul 2004
Location: Stockholm, Sweden
Posts: 1,229
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
Thanks for the answers!
Do you know of anyway to get the flow numbers for the vortec heads? I assume GM has some numbers but that seems to be a long shot...
Do you know of anyway to get the flow numbers for the vortec heads? I assume GM has some numbers but that seems to be a long shot...
#5
Registered
![Default](/forums/images/icons/icon1.gif)
tomas, call "JimV" at 616-735-0800. He has ported, and flowed many head designs, and may have some flow numbers on the Vortechs that you are looking for.
#6
MarineKinetics
![](https://www.offshoreonly.com/forums/images/icons/platinum_member_star.gif)
![Default](/forums/images/icons/icon1.gif)
Tomas,
Here are the flow #'s for the L-29 Vortec heads @ 28" H2O:
.100".....63.....49.....77%
.200".....121.....91.....75%
.300".....165.....120.....73%
.400".....198.....133.....67%
.500".....226.....140.....62%
.600".....242.....142.....59%
There is a significant drop off in the mid/higher lift flow numbers that you need to address in cam selection.
Bob
Here are the flow #'s for the L-29 Vortec heads @ 28" H2O:
.100".....63.....49.....77%
.200".....121.....91.....75%
.300".....165.....120.....73%
.400".....198.....133.....67%
.500".....226.....140.....62%
.600".....242.....142.....59%
There is a significant drop off in the mid/higher lift flow numbers that you need to address in cam selection.
Bob
#7
Registered
Thread Starter
Join Date: Jul 2004
Location: Stockholm, Sweden
Posts: 1,229
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
Thanks!!!
Are these numbers for stock valves? I put Manley 2.19/1.88 in mine.
How do I translate the numbers...
lift.....int.....exh.....exh/int?
Are these numbers for stock valves? I put Manley 2.19/1.88 in mine.
How do I translate the numbers...
lift.....int.....exh.....exh/int?
![Confused](/forums/images/smilies/confused.gif)