6.2 LSA in performance boats

[Ibeplumbing]

I know these have been out for a little while now. Seems as if I have only seen them in wakeboarding boats. I haven't found any hp or tq charts showing where they make their power. Seems as if they would be a good alternative to a Mercury big block considering their price point through Pace, Marine power, and a few others. I know illmore was going that direction as well. I'm curious how they would fare in a performance boat, and if they would be in boost too much to see any fuel savings

 

[ChevelleSB406]

I know a few people on here, maybe Shortdeck, have these in their 22 ft shockwave cats, but I think the only reason there are not more out there is, you cannot get them very easily with an outdrive, so jets and wakeboard boats are quite common, mercury won't warranty their drive behind them.

 

[Backlash]

I agree. I think they are a badass option for those looking to repower something a little older and smaller in size. The torque may not be in the same place as a big block but the efficiency and reduction in weight has to make a huge difference. It seems like you can squeeze a lot of hp out of them if done correctly.

 

[H2O]

The LSA's are also popular with the whitewater jet boats crowd - http://www.kemequipment.com/marine-engines/marine-engine-62L-V8-LSA.php

IMHO they would be badass in any light boat (especially one that packs air or runs on a pad), where the lower weight would pay dividends

Don't know about long-term durability in a marine application though ??

Read that Ilmor extensively reworded the internals, and improved oiling, in their 570 N/A version - https://www.ilmor.com/en/marine/recreational/MV8-570.aspx?menu_id=390

FWIW - Volvo elected to go with the 6.2 (with direct injection and variable valve timing) on their new 430 recreational package -
http://www.volvopenta.com/marinelei...drive-gasoline/v8-430-ce-ox/v8-430-ce-ox.html

 

[rvrrun]

When I got back into boating I thought they would be in everything. I'm guessing The aluminum block and heads are one of the reasons. They probably would not play well without closed cooling in the salt.

 

[Bigbore500r]

I know these have been out for a little while now. Seems as if I have only seen them in wakeboarding boats. I haven't found any hp or tq charts showing where they make their power. Seems as if they would be a good alternative to a Mercury big block considering their price point through Pace, Marine power, and a few others. I know illmore was going that direction as well. I'm curious how they would fare in a performance boat, and if they would be in boost too much to see any fuel savings

Power delivery is pretty stout, the 1.9L blower kicks in early and hard. Here it vlimbs north of 400ftlb just past 2000rpm under load.

The 2 charts are stock, VS intake / tune / +3psi Pulley
It will get away with pump gas in a car on that +3psi pulley, but in a boat I would think the sustained load would prevent it from running that much boost. But long tube headers, no cats, and a cam will bleed that boost back down almost to stock levels, and add another 80HP on top of that +3psi pulley ! ! ! !

Im waiting for a DIY guy to do one with all the tricks thrown at it.

 

[Ibeplumbing]

Power delivery is pretty stout, the 1.9L blower kicks in early and hard. Here it vlimbs north of 400ftlb just past 2000rpm under load.

The 2 charts are stock, VS intake / tune / +3psi Pulley
It will get away with pump gas in a car on that +3psi pulley, but in a boat I would think the sustained load would prevent it from running that much boost. But long tube headers, no cats, and a cam will bleed that boost back down almost to stock levels, and add another 80HP on top of that +3psi pulley ! ! ! !

Im waiting for a DIY guy to do one with all the tricks thrown at it.

View attachment 570220

How do these take to mods with the cast pistons? If you are going to mod them much, would you just be better off building a LSX or one of the LS 427/454's?

 

[Ibeplumbing]

I agree. I think they are a badass option for those looking to repower something a little older and smaller in size. The torque may not be in the same place as a big block but the efficiency and reduction in weight has to make a huge difference. It seems like you can squeeze a lot of hp out of them if done correctly.

Are you talking small as in 25 ft cat? Or smaller? It seems like a better option than the scorpions would be either as a small single or twins

 

[Shortdeck]

I know a few people on here, maybe Shortdeck, have these in their 22 ft shockwave cats, but I think the only reason there are not more out there is, you cannot get them very easily with an outdrive, so jets and wakeboard boats are quite common, mercury won't warranty their drive behind them.

Nope, not me. I have a BBC. There is a member though that has a Shockwave 22 deck with the LSA motor and a jet. And he's getting decent speed numbers too.

I believe a read a thread that said something along the lines of: an LSA and outdrive are not really compatible because the drives don't like extended time over 6000 RPM.

 

[pronstar]

How much more torque do you guys think a naturally aspirated BBC like a 525 actually makes?

I bet this LSA makes as much torque, or even more, much sooner/lower rpm than most off-the-shelf Merc NA big blocks...?

 

[LargeOrangeFont]

How much more torque do you guys think a naturally aspirated BBC like a 525 actually makes?

I bet this LSA makes as much torque, or even more, much sooner/lower rpm than most off-the-shelf Merc NA big blocks...?

It does. The LSA will make within 10% or so of its peak torque from 2500 to 6000 RPM.

The problem is the RPM. You'd need a different geared drive, to run with an LSA, and then the Bravos can't take the 6000+ RPM.

 

[LargeOrangeFont]

The LSA's are also popular with the whitewater jet boats crowd - http://www.kemequipment.com/marine-engines/marine-engine-62L-V8-LSA.php

IMHO they would be badass in any light boat (especially one that packs air or runs on a pad), where the lower weight would pay dividends

Don't know about long-term durability in a marine application though ??

Read that Ilmor extensively reworded the internals, and improved oiling, in their 570 N/A version - https://www.ilmor.com/en/marine/recreational/MV8-570.aspx?menu_id=390

FWIW - Volvo elected to go with the 6.2 (with direct injection and variable valve timing) on their new 430 recreational package -
http://www.volvopenta.com/marinelei...drive-gasoline/v8-430-ce-ox/v8-430-ce-ox.html

That is an LT based engine. Looks like what is in a modern Escalade.

No LS based engine is direct injected.

 

[jesco]

Nope, not me. I have a BBC. There is a member though that has a Shockwave 22 deck with the LSA motor and a jet. And he's getting decent speed numbers too.

I believe a read a thread that said something along the lines of: an LSA and outdrive are not really compatible because the drives don't like extended time over 6000 RPM.

I have a 22 Shockwave deck with an LSA. LOVE IT. Loaded up, 60 gallons of fuel, and bimini up its an honest 60mph boat (65 in the right water). I have seen 72 in early spring with top down. We ran from the 10fwy to Fishers Landing Fathers Day weekend, 70 miles each way, burned 33 gallons the way there with an average speed of 40 mph. Thats pretty damn good for a jet bote!!! I did have a few issues when the boat was new, but the new computer mapping Bob just installed got rid of all that. As far as for a stern drive... I have no idea how it would work. I know Bob said for a new boat, you can't beat pricing and warranty of a turn key Merc package. Jet bote you have to buy motor/pump separate anyway so isn't a factor. My boat is a big heavy boat, this little motor has ZERO issue with the weight, gets up out of the water quick.

 

[LargeOrangeFont]

I have a 22 Shockwave deck with an LSA. LOVE IT. Loaded up, 60 gallons of fuel, and bimini up its an honest 60mph boat (65 in the right water). I have seen 72 in early spring with top down. We ran from the 10fwy to Fishers Landing Fathers Day weekend, 70 miles each way, burned 33 gallons the way there with an average speed of 40 mph. Thats pretty damn good for a jet bote!!! I did have a few issues when the boat was new, but the new computer mapping Bob just installed got rid of all that. As far as for a stern drive... I have no idea how it would work. I know Bob said for a new boat, you can't beat pricing and warranty of a turn key Merc package. Jet bote you have to buy motor/pump separate anyway so isn't a factor. My boat is a big heavy boat, this little motor has ZERO issue with the weight, gets up out of the water quick.

That sounds bad ass.

 

[Backlash]

Are you talking small as in 25 ft cat? Or smaller? It seems like a better option than the scorpions would be either as a small single or twins

I was wondering how a 19' Howard with a v-drive would do with an LS based motor. Maybe not necessarily a 6.2 but even a built 5.3/5.7/6.0 setup with a small Whipple. Since my bucket is nowhere near finished, I'm always wondering which direction to take regarding power. Hang the 2-smoke back on it or go with a v-drive and try something different.

 

[jesco]

That sounds bad ass.

For a "stock" powered boat, its pretty impressive. Same boat with a 502 is slower and will burn through WAY more fuel. My buddy that did the run Father Day has a 21 skier with a 454, he burned 7 more gallons then I didn't, and was in the back of the pack running a little slower (average speed of 36mph).

 

[Ibeplumbing]

It does. The LSA will make within 10% or so of its peak torque from 2500 to 6000 RPM.

The problem is the RPM. You'd need a different geared drive, to run with an LSA, and then the Bravos can't take the 6000+ RPM.

I know quite a few guys that have BBC that run 6500 rpm. They don't run it there very long. I think they are running 1.24 and 1.36 gears in their bravos

 

[H2O]

That is an LT based engine. Looks like what is in a modern Escalade.

No LS based engine is direct injected.

That sounds right..just thought it was interesting that Volvo elected to go "small block and modern" on the 430 (direct injection & VVT, which adds efficiency but complexity) whereas Merc stayed with the 8.2

 

[LargeOrangeFont]

I know quite a few guys that have BBC that run 6500 rpm. They don't run it there very long. I think they are running 1.24 and 1.36 gears in their bravos

You'd need to run the LSA at 4500+ rpm for cruising. So for high speed boating, you'd be up above 5500 all the time.

 

[Flying_Lavey]

That is an LT based engine. Looks like what is in a modern Escalade.

No LS based engine is direct injected.

LT motors are in the new Corvettes. And camaros. There isn't much difference between the truck and car motors now though I believe. Probably just mapping and cam.

 

[LargeOrangeFont]

LT motors are in the new Corvettes. And camaros. There isn't much difference between the truck and car motors now though I believe. Probably just mapping and cam.

There are some small differences in the heads, cams are different, intakes are different.

The truck 6.2 is 420HP 460 torque. It stands to reason that would be a better pleasure boat engine as it has a broader power band and lower RPM. The Volvo Penta is using a huge intake manifold like the trucks do as well.

 

[Skinny Tire AH]

Not that it really applies, but look at the torque made here. The engine came out of a 6.0 MAX Silverado. I hope someone build a mid-sized cat with a set of these. The weight savings alone would result in some interesting performance characteristics. A 318 Skater or a 30 foot Predator. I think it was an LS3 block/head combo in those trucks

 

[LargeOrangeFont]

Not that it really applies, but look at the torque made here. The engine came out of a 6.0 MAX Silverado. I hope someone build a mid-sized cat with a set of these. The weight savings alone would result in some interesting performance characteristics. A 318 Skater or a 30 foot Predator. I think it was an LS3 block/head combo in those trucks

View attachment 570311

That block is very similar to an LS2 block actually, but with the square port LS3 style heads.

LS3s were all 6.2 The later model trucks went to a 6.2 block as well.

 

[allblowdup]

I have a couple of them in my boat. Roughly 575 hp ea with a 4 lb pulley on 91 fuel. The cam is so small on these that they really do not make alot more power above 5500. They kill a zz502 hands down but a 525 would prob be a bit better.

 

[H2O]

View attachment 570409 View attachment 570410
I have a couple of them in my boat. Roughly 575 hp ea with a 4 lb pulley on 91 fuel. The cam is so small on these that they really do not make alot more power above 5500. They kill a zz502 hands down but a 525 would prob be a bit better.

Nice! What is the total weight of your rig? Acceleration must be "brisk" with that set-up :thumbsup

 

[HitIt]

View attachment 570409 View attachment 570410
I have a couple of them in my boat. Roughly 575 hp ea with a 4 lb pulley on 91 fuel. The cam is so small on these that they really do not make alot more power above 5500. They kill a zz502 hands down but a 525 would prob be a bit better.

Holy shit. I cant even imagine how fun that things is. Must take a few days for the smile to wear off your face after a day on the river.

 

[Bigbore500r]

View attachment 570409 View attachment 570410
I have a couple of them in my boat. Roughly 575 hp ea with a 4 lb pulley on 91 fuel. The cam is so small on these that they really do not make alot more power above 5500. They kill a zz502 hands down but a 525 would prob be a bit better.

Can we get some videos of that sucker?!

 

[allblowdup]

Nice! What is the total weight of your rig? Acceleration must be "brisk" with that set-up :thumbsup

Not real sure but it is heavy! 1/2 bottom and a 3/4 inch keel plate. Does approx 75 mph and ya you cannot stay standing if you hit it.