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true, once you cross over that power level, boosted is the only way to make it,,,,but makes my ass pucker thinking about keeping each cylinder equally happy when laying in the throttle lol
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Why don't more use the LS7 (427) based LS motors? At least for a boat it would help with displacement. Seems a SC version would be a nice package.
I keep wondering how these would be if you just wanted light weight and smaller footprint as a replacement for HP 500's. For the ski boat world PCM says it will give you a 5 year warranty on them. http://www.gmpowertrain.com/engines/...0Sheet.pdf?v=2 |
Originally Posted by MILD THUNDER
(Post 4656522)
I think like rookie said, sometimes the dyno king number isnt always the fastest setup.
then you have the whole dyno correction factor stuff, plus many dont dyno fully dressed in marine trim. Dyno headers vs manifolds can be significant, as well as sea pump, water pump, alternator, steering pump, etc. That stuff could add up to 50+hp losses Add water pumps, alternator, power steering pump, manifolds, wet exhaust,,,,,, I would like to see the numbers then. |
Originally Posted by Wildman_grafix
(Post 4656573)
Why don't more use the LS7 (427) based LS motors? At least for a boat it would help with displacement. Seems a SC version would be a nice package.
I keep wondering how these would be if you just wanted light weight and smaller footprint as a replacement for HP 500's. For the ski boat world PCM says it will give you a 5 year warranty on them. http://www.gmpowertrain.com/engines/...0Sheet.pdf?v=2 |
Originally Posted by Baja Rooster
(Post 4656537)
I remember someone selling a pair of LS after switching out the big blocks in a Fountain because they just didn’t measure up torque wise but I think it was a 33’. So many variables though. https://cimg2.ibsrv.net/gimg/www.off...547ceaaa3.jpeg |
242LS, interesting graph. The torque and HP advantage from 4-5k is pretty decent on the 509. Looks like the 509 runs out of cam/valve train past 6K. But I would not think you would want to spin a BBC boat motor much past 6K anyway. Beyond that there is obviously so many many other factors than just displacement. There are some pretty cool comparisons of stuff like this on "motortrendondemand" specifically the engine masters series. You can watch them for free with advertisements. But I pay the $4 a month for the membership. There is so much content. I hardly even watch regular TV anymore.
John |
Cool graph to compare.Thanks.
Speaking of 32 Sunsations vs engines Any of you guys remember Domscott from Speedwake days? Older nonstepped 32 Sunsation Dominator. 502's/fact rect heads other than springs and etc/ 741 cams/ lightning headers / small 174blowers/nose cones on the Bravo's and Sternjack's of all things ran just over 100. |
Dyno graphs and sheets are a nice discussion piece but a lot of variables can alter them. Correction factor, how the engine was dynoed meaning accessories and exhaust. Although an invaluable tool for tuning and setting up a new engine they aren’t the end all be all. Many guys show high dyno numbers and the boat is no faster or barely faster than same hull with stock power. I believe the 32 sunny mentioned is one of those. While the LS dyno sheets look good I think I saw stayed in the ad he only ran 88. Some quick research shows the non stepped take about 700 and the stepped about 600 to get near 100. |
Originally Posted by SB
(Post 4656608)
Cool graph to compare.Thanks.
Speaking of 32 Sunsations vs engines Any of you guys remember Domscott from Speedwake days? Older nonstepped 32 Sunsation Dominator. 502's/fact rect heads other than springs and etc/ 741 cams/ lightning headers / small 174blowers/nose cones on the Bravo's and Sternjack's of all things ran just over 100. Thats also when/where I met Bailey with procharged 502's that I mentioned earlier. John |
Great graph. If you can get the engines up to 5600 those engines would scream until the bravo melted. Are those engines with blowers? That would seem mandatory on an LS. |
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