|
The 454 LSX apparently can be run on 92 octane with 11.1:1 pistons (not sure how that is), but this article (if true and accurate) is quite a testimonial:
http://www.gmperformanceparts.com/_r...erationLSX.pdf Interesting stuff... |
Maybe 5 minutes isnt a very long time at WOT? I have never run any of my motors at WOT more than a minute or two. Different applications I guess.
My motor is coming from Marine Power, but I have driven a couple of boats that had the same power plant from Kodiak. Both seemed to run out really well. |
Originally Posted by Smarty
(Post 2991669)
The 454 LSX apparently can be run on 92 octane with 11.1:1 pistons (not sure how that is), but this article (if true and accurate) is quite a testimonial:
http://www.gmperformanceparts.com/_r...erationLSX.pdf Interesting stuff... That seems like a winner to me! MP |
We started with crate engines. Marinized them and then ran them stock to get a 550 hp baseline. Changed the cam and ran some more at aprox 600hp. Went throught the engines and changed compression and cam again to match.
The big part has been the tune. We did all the tune in the boat then upgraded the engines got a base cal and modified the tune in the boat again. They are very efficient. On the dyno 650hp on one and 649hp on the other. 800 hp with high compression and good fuel is where we will end up. The point was to push the engines and find the weak parts. We have changed the pulley (on the tensioner) for the serpentine belt because we lost a belt in the rough. Thats it. It is very hard to put a number on prototypes we have been treading new ground for a while now. Helps to have good friends....not sure they want to still talk to us about this project anymore. We have been working on these engines to put a complete package together (engine / transmission / drive) for the marine and offroad. The hp/weight ratio is hard to beat. pat W |
Originally Posted by shifter
(Post 2992151)
We started with crate engines. Marinized them and then ran them stock to get a 550 hp baseline. Changed the cam and ran some more at aprox 600hp. Went throught the engines and changed compression and cam again to match.
The big part has been the tune. We did all the tune in the boat then upgraded the engines got a base cal and modified the tune in the boat again. They are very efficient. On the dyno 650hp on one and 649hp on the other. 800 hp with high compression and good fuel is where we will end up. The point was to push the engines and find the weak parts. We have changed the pulley (on the tensioner) for the serpentine belt because we lost a belt in the rough. Thats it. It is very hard to put a number on prototypes we have been treading new ground for a while now. Helps to have good friends....not sure they want to still talk to us about this project anymore. We have been working on these engines to put a complete package together (engine / transmission / drive) for the marine and offroad. The hp/weight ratio is hard to beat. pat W Thank you for the information, great concept coming to fruition. I really like Pantera's new 28' twin step, and I think that (your package) set-up would be ideal. I have lots of ideas....just cost $$$. But gathering the information is the first stage and that is where I am, my timetable is uncertain, .... I wish you best, keep me updated if you can. Thanks, Stephen [email protected] |
Any one interested in an LS 9 thats bolted to a brand new ZR 1 around 127 K ?? 638 hp
|
The article mentions you can get to 500ci with the tall deck 9.7 version of the LSX block. That would help get the torque numbers up even further.
|
Look at this, and look at the price with headers. Just saw this in the classifieds today.
http://www.offshoreonly.com/classifi...o32809-en.html |
Originally Posted by Smarty
(Post 3044119)
Look at this, and look at the price with headers. Just saw this in the classifieds today.
http://www.offshoreonly.com/classifi...o32809-en.html So... who's gonna step up? IMO, a pair of the naturally aspirated package would be sufficient to push todays 28-30ft boats to about 90, and 5600rpm and 435tq would not hurt bravos. Man... i sound like a broken record. |
1 Attachment(s)
Originally Posted by Stormrider
(Post 3044156)
Wow... both are nice packages. 800runsnew is a pretty decent operation too, from what i've read.
So... who's gonna step up? IMO, a pair of the naturally aspirated package would be sufficient to push todays 28-30ft boats to about 90, and 5600rpm and 435tq would not hurt bravos. Man... i sound like a broken record. It has been a while, but I thought you might like this LS S/C from Keith Eickert/Don Onken LS block, 415 cu.in., 675 hp, Vortech supercharger. I do not know the cost, but the it looks pretty dam good. "The new generation 675 is here. The same performance and reliability as the 575 “Super Mouse”, but with the added boost from a Vortech Twin Screw Supercharger! Experience the fun of trouble free boating from Lightning Performance Group!" - quote from the website: http://www.lightningperformancegroup...ngine-675.html |
Originally Posted by Smarty
(Post 3135945)
It has been a while, but I thought you might like this LS S/C from Keith Eickert/Don Onken
LS block, 415 cu.in., 675 hp, Vortech supercharger. I do not know the cost, but the it looks pretty dam good. "The new generation 675 is here. The same performance and reliability as the 575 “Super Mouse”, but with the added boost from a Vortech Twin Screw Supercharger! Experience the fun of trouble free boating from Lightning Performance Group!" - quote from the website: http://www.lightningperformancegroup...ngine-675.html But i'm sure for the same $, i could have ZUL(and definitely JC) build me some. Those are probably the same cost as some Ilmors. |
Originally Posted by Stormrider
(Post 3136234)
Looks nice.
But i'm sure for the same $, i could have ZUL(and definitely JC) build me some. Those are probably the same cost as some Ilmors. |
Originally Posted by Raylar
(Post 2983773)
Right Here Now!
Both of these GM engines are in question now even for sales for car applications and even marine use will be a problem if you need the 500 ft/lbs of torque since the engines would be in boost all the time to deliver those numbers. This is the real reason Raylar & Mercury opted not to use or develop marine engines based on these smaller cubic inch supercharged engine platforms. Small cubic inch engines no matter how light in weight that can't deliver big torque numbers without boost are just small blocks of limited power and if they are in boost all the time to deliver these higher torque numbers, they are not going to live in marine high performance use no matter how COOL they look or sound! THERE AIN'T NO REPLACEMENT FOR DISPLACEMENT!! In Boats Anyway! This is why Raylar developed the LSM550 in a 434cu.inch size normally aspirated in an all aluminum version that is fresh water cooled and delivers over 500 ft/lbs of torque from 3800 to 5400 rpms. This is the torque and power that is needed in performance boats and is what variable cam timing in a bigger inch aluminum small block can deliver. The only real problem for Raylar at this time with this motor is no one seems to have the money to buy new engines of this type in this economy so we'll just have to wait for the recovery?? If you've got the dollars, we've got the answer and the engine! You guys figure out how to get a 365cubic inch or so small block to make 500ft/lbs of torque OUT OF BOOST and we'll start making them as quickly as we can! Best Regards, Ray @ Raylar Torque is torque, for sure, but what about with light boats? We have small light boat with only 3.400 lb completted, but with out of engine bobtail. It mean arround 4.500 lb with big block. Boat have pad keel and ride smoth. With light LS3 engine will have probably less than 4.200 lb. Please oppinion about repowering with: - Marine Power engine LS3 - Kodiak Marine 6,2 V8 VVT DI(L86) - Ilmor OPS 6,2L (Or new eddition.) Our goal it is maximum speed arround 70-75 mph and travel speed 35-40 mph. 90% or more ride will be by travel speed and per year we will do maximum 50 working hours. What to do? Big block or one of this small blocks? |
Hi,
Would small block LS3 with 400+ HP work good on 4.200 lb boat, or better to buy big block? |
Your writing implies English is second language. Your location and what is available and has parts availability is a bigger concern than 150 lbs more or less in the back of your boat.
|
In fact, english is my fifth language and unfortunately I have no time to learn it better. (Best buisenes happen in other part of world at the moment and this languages I learn.) Sorry but hopefully will somebody want to understand my question.
I do not understand why is this few thousands miles problematic for spare parts? In radius of 100 miles we have at least 5 sellers which sell wake boats with LS3 engines and I talk with them in my first and seccond language, but they are sellers with zero experiences about motorisations. Never the less we send spare parts for our products in time in China, South Korea and even in Salt Lake City. I do not understand why should be trouble if I ask somebody from your country to send me rubber pipe by DHL. Back on my question. It is not all only in few pounds. I understand, big block is in some way heritage of USA, but I look on this iron cube like on T-Rex, sorry. LS3 or DI(L86) look much, much more sofisticated and in compare with 8,2 is like F16 compared with P47. Both excelent but not in same time. I know, torque is wery important and I do not have experiences how much torque need arround 4.200 lb heavy boat with 400 hp. On this forum is lot of expert and please try to understand my english and I kindly ask for constructive answer. |
| All times are GMT -5. The time now is 11:19 PM. |
Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.