LS Build: In Progress
03-18-2019 | 06:46 PM
#161
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From: chicago
close to a merc 420. Also a LS3 crate. Similar hp, different torque curve for sure.
Last edited by MILD THUNDER; 03-18-2019 at 07:20 PM.
03-18-2019 | 06:47 PM
#162
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From: San Tan Valley AZ
Btw. I will be doing a b testing on the coolant system. Both are setup with 160 thernostat. One has 2 holes drilled. One has 3. I will be running them monitoring temperature stability and water pressure when we do get out and about. Figured it would be a good idea so people know what to expect when the give this a go
03-18-2019 | 06:51 PM
#163
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From: San Tan Valley AZ
03-18-2019 | 07:09 PM
#164
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From: Toledo Oh
I was looking for the 310-330 torque numbers earlier... Merc seems to keep those closely guarded for some reason....
03-18-2019 | 07:30 PM
#166
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From: chicago
The LS3 crate is 10.7:1 static, where the 454HO is 8.75:1. I can see where the big block would shine , in the lower rpm and acceleration department.
Suprised the 6.2L LS3 doesnt make more torque, a 6.4L hemi makes around 475ft lbs.
Suprised the 6.2L LS3 doesnt make more torque, a 6.4L hemi makes around 475ft lbs.
03-18-2019 | 08:15 PM
#167
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From: Grand Rapids, MI
I personally will not build high RPM boat engines again. To achieve my PK HP and speed I was spinning my engines ~6500 RPM that pushed my "legit" cruise speed to 5000 RPM's. There was never a real balance in prop pitch selection. Either spin the s#it out of them with a small wheel or load the engines with a bigger prop. Engines ran great, but running engines 6000+RPM's for miles that you hand built with your hard earned money just makes your guts pucker.
03-18-2019 | 09:24 PM
#168
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From: Northport N.Y.
be carful plastic hose on wastegates it will melt off if you run it hard enough at least in a boat it will. Came back from a ride in my vdrive and nothing was hooked up and making big boost. Lo
03-18-2019 | 10:14 PM
#169
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From: San Tan Valley AZ
03-18-2019 | 10:24 PM
#170
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From: San Tan Valley AZ
Nice numbers.
I personally will not build high RPM boat engines again. To achieve my PK HP and speed I was spinning my engines ~6500 RPM that pushed my "legit" cruise speed to 5000 RPM's. There was never a real balance in prop pitch selection. Either spin the s#it out of them with a small wheel or load the engines with a bigger prop. Engines ran great, but running engines 6000+RPM's for miles that you hand built with your hard earned money just makes your guts pucker.
I personally will not build high RPM boat engines again. To achieve my PK HP and speed I was spinning my engines ~6500 RPM that pushed my "legit" cruise speed to 5000 RPM's. There was never a real balance in prop pitch selection. Either spin the s#it out of them with a small wheel or load the engines with a bigger prop. Engines ran great, but running engines 6000+RPM's for miles that you hand built with your hard earned money just makes your guts pucker.
