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Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   thinking about LS swap from twin 454??? (https://www.offshoreonly.com/forums/general-q/357393-thinking-about-ls-swap-twin-454-a.html)

hogie roll 10-29-2018 06:17 PM
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.
Tuning up the smallest twin engine boats seems smart if your budget forces you to stay with bravos. Something that really flys with 600hp. Early dominators are one of the most affordable candidates.

242LS 10-29-2018 08:02 PM
Originally Posted by hogie roll (Post 4656623)


Tuning up the smallest twin engine boats seems smart if your budget forces you to stay with bravos. Something that really flys with 600hp. Early dominators are one of the most affordable candidates.
They're going in a Sutphen 30' Ocean Pacer. Should do well.

Wildman_grafix 10-30-2018 07:55 AM
Originally Posted by 242LS (Post 4656600)
I was thinking about the "no replacement for displacement" comment and remembered I had a graph of the dyno results from my old 509s (HP500s w/Marine Kinetics CAM w/AFR heads) to compare against Dennis' 416CI LS3 motors from Swap Shop. I added the numbers from his dyno sheet to compare.....

https://cimg2.ibsrv.net/gimg/www.off...547ceaaa3.jpeg
I looked at those to and decided by the time they take over my BBC you are spining them pretty good.

Wildman_grafix 10-30-2018 08:02 AM
Originally Posted by Baja Rooster (Post 4656577)


Ill speculate that the main reason is 427 is the limit where most here want 502s at a minimum where even 454s aren’t enough, and the LS is still cost prohibitive. In 30’ and less they seem perfect.
I was thinking in a boosted application the 427 would be a nice base to start with. The link is to a boosted 6.2 that has pretty good low end TQ so I would think the 427 would do well. Mild's (Joe) boosted 454 do real well.

Thinking out loud, the LS offers variable cam timing, more modern design, and small weight/ size.

In anything over 30 I don't think it would matter but in something like my little boat I do think it would. Looking at the picture of the LS in the Sunny the distance between the headers were NICE. Does seem the cost is a issue.

Knot 4 Me 10-30-2018 08:30 AM
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.
Yes I remember him well from Sunsation's forum and the Sunsation rallies. The Sternjack's were a pucker factor 10. Boy knew no color other than lime green.

Knot 4 Me 10-30-2018 08:33 AM
Originally Posted by jadento (Post 4656614)
Yes I met Scott may years ago at the Sunsation Rally. Think the boat was bright green and black. Your details sound right and yes he said it would run 100. Personally I didnt really buy it, but whatever. Like ive already said. The 509's in the Sunsation I had dynoed at 650hp(dyno headers, no accessories) and it did 92 as an average. You can do the math.

Thats also when/where I met Bailey with procharged 502's that I mentioned earlier.

John
A true 100+ MPH Dominator was Dragonheart.

jadento 10-30-2018 12:48 PM
Originally Posted by Knot 4 Me (Post 4656722)
A true 100+ MPH Dominator was Dragonheart.
Yes the Dragonheart. That was the fastest Dominator back then. Not sure about now. My personnel experience is that low 90's can be pretty hairy with not alot of hull left in the water. I cant imagine going 110 or whatever it did! But I guess with more power one might be able to use less trim and have the boat be more settled.

John

Baja Rooster 10-30-2018 12:57 PM
Originally Posted by XtremeCFM (Post 4656571)
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
XtremeCFM, is there a good spot to find out more about putting an LS charger on the 5.3?

Back to our regularly scheduled programming...

XtremeCFM 10-30-2018 01:48 PM
well the lsa take-off's are running about $1200 on ebay from what im seeing lately,,,they were alot cheaper and plentiful when gm was replacing them under warranty. The reason for them being replaced thru gm was due to the spring isolator making noise, which everyone just installed a solid one.
So then you need the lid with heat exchanger brick, a new camaro zl1 is about $600, sometimes you can find the cts-v take offs from one that upgraded to the zl1 lid for a few hundred.
Then you need fuel rails for the lsa blower $285
To adapt the blower to a cathedral port head, you need the adapters which are about $175
Used take off injectors from a cts-v or zl1 should only be about $100
On ebay you can get front mount heat exchangers and pump for under $200 with all the hoses.
then to run your accessories, lets say on a truck, LSX innovations makes a real nice and simple setup to drive everything off one belt for $325
Thats about it really

almost at 10 posts!

getrdunn 10-30-2018 03:16 PM
Originally Posted by Wildman_grafix (Post 4656574)
Joe you would love this, I seen one builder selling 650 HP 540 cu in motors. Shows the dyno run, long tube headers, no accessories even running a electric water pump.

Add water pumps, alternator, power steering pump, manifolds, wet exhaust,,,,,, I would like to see the numbers then.
650 hp 540 builds are pretty much a no brainier. Unless builder is misleading and false advertising there will always be many variables including what's strapped behind the engine. Realistically it's what's at the propshaft or wheels that counts. Most importantly you reach your personal goals for whatever your application is. Amazing how much HP a fixed flex fan can cost you. 30hp + or -. Not only that their dangerous. Seen one come through the hood at the track once. In a nutshell it would be difficult for a builder to know whether it be marine OR automotive.


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