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Then no way to know stingy or graceful a dyno is.
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Originally Posted by mggdoors
(Post 4685145)
Im sure they will considering I have the ability to rev it if I choose to This is what I see:
But that is just me, idk but I will be following as this next winter its time for a repower for me. I guess when it hits the water we will know. |
Originally Posted by Wildman_grafix
(Post 4685171)
Maybe if you run 1.65 drives?
This is what I see:
But that is just me, idk but I will be following as this next winter its time for a repower for me. I guess when it hits the water we will know. |
On point phil. I’ve yet to see an NA LS outdo an NA big block though we keep seeing people try. There was the 650hp set for sale for a long time and the speeds posted by the owner with a sunny I think were on par with a 500efi version. Always interesting to see though. |
Originally Posted by Crude Intentions
(Post 4685186)
On point phil. I’ve yet to see an NA LS outdo an NA big block though we keep seeing people try. There was the 650hp set for sale for a long time and the speeds posted by the owner with a sunny I think were on par with a 500efi version. Always interesting to see though. |
Those were tye "650hp" ones....ran 88mph in a 32 sunsation....which is what they run with 500efis or darn close. 300 more hp, a few hundred lbs less weight, should have made it faster than a 500efi boat.
Then again, maybe they didnt actually make 650hp, the dyno just said they did. |
Ok. Just saying. I’ve yet to see a set go in a boat and outdo the big blocks. Maybe you’ll be the first. |
I really enjoy these projects and learn a great deal from them. They seem like a great set up for something like a twin 29’ Outlaw where that much junk in the trunk makes them porpoise like a chunk monkey on a single ski. |
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These number are spot on for the engines that came in this boat. Verify if you would like 2003 Eliminator Daytona Tall Deck. Boat is 7500lbs with bbc fuel and me. Subtracted 1000lbs for ls setup. Hp numbers are all j607 standard. 1.36 gearing is what gearing was ran on the boat from the factory and used for bbc engines. 1.5 is what is on there now. Props are in accordance with what is needed and actually what came with those packages. VERIFY it I dare you. All with less fuel than all the rest. I figure a free tank of gas every 10 hours. Way less than the blower motors I pulled out.
Alot of research and thought went into me pulling blower engines out. I know some of you want to beat me up about this. So be it. Logic tells me this is the way to go. Will it be as fast as it was. NO. Will it accelerate as fast. TBD. Will it save me thousands of dollars in fuel. YES. Is it a mild build yes and payed for by soley parting my bbc. Will it work for everyone. No. But please do the math. The weight savings alone gains 160hp worth of speed in my boat. No money out of the pocket just shedding weight. And just imagine all this with no blowers, 60-100 ci less, and alot of room to grow.Yes a bbc can make more power. But try this with a comparable engine such as a 496 with stock heads and a cam and see how you come out. Thats all this is is a cammed stock headed stroker. Remember boys I have a car in my garage that is ls turbo making more power than many of your twins put together. I could easily mimic this in marine app. Why not. Because its not a biggest dick contest. Its just me documenting a build to help others who enjoy this or are considering it. I am not trying to come off as an a-hole just trying to do my end of the deal here. Good Day |
Can’t wait to see the results of them in the boat. Again good luck but you’d be the first to prove us wrong. Get em in and get some numbers. Also your first post said you’d make a 525efi look like a fool across the whole powerband. That didn’t happen. I’d take a 525efi over this any day of the week. Again most of us want to see an NA LS work but it hasn’t happened yet. |
Originally Posted by Crude Intentions
(Post 4685231)
Can’t wait to see the results of them in the boat. Again good luck but you’d be the first to prove us wrong. Get em in and get some numbers. Also your first post said you’d make a 525efi look like a fool across the whole powerband. That didn’t happen. I’d take a 525efi over this any day of the week. Again most of us want to see an NA LS work but it hasn’t happened yet. BTW I understand you havent seen an ls get it done yet which is understandable considering there are probably less than 20 boats using them in sterndrives. Kinda hard to judge when playing with a unicorn wouldnt you say. |
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Im surprised the twin LS package would be 1,000 lbs less than a 525efi engine. The ls engine is 500lbs lighter than the 525efi?
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Originally Posted by MILD THUNDER
(Post 4685239)
Im surprised the twin LS package would be 1,000 lbs less than a 525efi engine. The ls engine is 500lbs lighter than the 525efi?
http://bdturnkeyengines.com/engine-dimensions |
Originally Posted by MILD THUNDER
(Post 4685239)
Im surprised the twin LS package would be 1,000 lbs less than a 525efi engine. The ls engine is 500lbs lighter than the 525efi?
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Where do you beat a 525efi? To me you are below it everywhere. Also forgive me I don’t recall but did you dyno in marine trim or dyno trim?
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i don,t know the weight of the ls engine but the 525 efi has edelbrock aluminum heads so i doubt it weighs 500 lbs more than the ls engine.350 lbs seems more like it to me.
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Just read an article where they swapped an ALL iron bbc, from a 67 chevelle, for an ALL aluminum LS3. Car scaled 266lbs lighter.
Had that bbc had alum heads, the difference would have been prob 190-200lbs. Are yours aluminum or iron blocks Mgg? |
Originally Posted by mggdoors
(Post 4685119)
Here is a 468 blower motor on the same dyno just for comparison sake. You can decide if it is greedy or not. I believe he said this was 731 cam https://cimg1.ibsrv.net/gimg/www.off...573c66deb.jpeg |
joe,just to prove my point,if i remember correctly you have 468s with merc 420s,do you have a dyno sheet to post up as i don,t remember your hp and torque figures.
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Originally Posted by mike tkach
(Post 4685252)
joe,just to prove my point,if i remember correctly you have 468s with merc 420s,do you have a dyno sheet to post up as i don,t remember your hp and torque figures.
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I’m on board if they’re bored and stroked to 454 with ported heads and tunnel rams :D:D Theyll be more efficient than bbc blower motors for sure. But I wouldn’t think they’d be more efficient than an injected big block. They may have a better chamber, but that would be a minor improvement. If you’re talking apples to apples NA motors. |
I think we once again missed the point. That 468 blower motor is not something I an competing against. Just a reference to judge against as for accuracy of the dyno I ran on. Thats it. If I wanted to compete with a blower motor than I would compete by either turbo or supercharger/ procharger. Not the case. Its just a reference |
Originally Posted by MILD THUNDER
(Post 4685249)
Just read an article where they swapped an ALL iron bbc, from a 67 chevelle, for an ALL aluminum LS3. Car scaled 266lbs lighter.
Had that bbc had alum heads, the difference would have been prob 190-200lbs. Are yours aluminum or iron blocks Mgg? |
I’m all for you doing whatever you want to your boat. I feel kinda bad for this second guy you convinced to do the same with all of these exaggerations though. |
Originally Posted by hogie roll
(Post 4685254)
I’m on board if they’re bored and stroked to 454 with ported heads and tunnel rams :D:D Theyll be more efficient than bbc blower motors for sure. But I wouldn’t think they’d be more efficient than an injected big block. They may have a better chamber, but that would be a minor improvement. If you’re talking apples to apples NA motors. |
Originally Posted by mggdoors
(Post 4685237)
Originally Posted by mggdoors
(Post 4679207)
I am looking for dyno sheet specific to the dyno we run on to get a valid comparison. Different dynos show different #s |
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Originally Posted by hogie roll
(Post 4685259)
I’m all for you doing whatever you want to your boat. I feel kinda bad for this second guy you convinced to do the same with all of these exaggerations though. |
Originally Posted by Wildman_grafix
(Post 4685263)
Just to make sure everyone knows that dyno test of the 525 was full marine, wet heads and all. And that motor will run on 87, I think you will have to run 91 with the compression you are running. Again, we will see when you get it in the boat. That will be interesting.
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I feel like I'm missing something with this handful of people vs MGG Doors. What am I missing ? Another thread ? sometimers ? Or did I not read a bunch of this thread?
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You have high compression (yes 11:1 is high in the marine world), cammed stroker motors. You still don’t beat a stock bottom end 525efi anywhere on the dyno sheet. You rev a little higher. Your words were you were gonna make it look like a fool through the whole powerband. My engines are stock bottom end. Iron headed with no work done. Carb motors with a cam. 8.7:1 compression and I beat you through the powerband to 6k. I’m 20k in on both motors. Youre right in saying theres only a few LS powered stern drive boats. I wonder if it’s because it doesn’t work. Let’s think logically here. If it was that easy and so much cheaper don’t you think it would have taken off like wildfire? Threw some nice supercharged 550hp LS stuff in wakeboard boats that would likely be a beyond suitable replacement for say the 525. Again the results are always in the boat. The paper numbers always work and yet real world hasn’t |
Originally Posted by SB
(Post 4685267)
I feel like I'm missing something with this handful of people vs MGG Doors. What am I missing ? Another thread ? sometimers ? Or did I not read a bunch of this thread?
The LS engines been out for OVER TWENTY YEARS!! Its time guys stop acting like they defy the laws of physics. Sure they are a nice platform, but good lord, they arent magic. They are a friggen pushrod two valve V8. lol |
Originally Posted by Crude Intentions
(Post 4685269)
You have high compression (yes 11:1 is high in the marine world), cammed stroker motors. You still don’t beat a stock bottom end 525efi anywhere on the dyno sheet. You rev a little higher. Your words were you were gonna make it look like a fool through the whole powerband. My engines are stock bottom end. Iron headed with no work done. Carb motors with a cam. 8.7:1 compression and I beat you through the powerband to 6k. I’m 20k in on both motors. Youre right in saying theres only a few LS powered stern drive boats. I wonder if it’s because it doesn’t work. Let’s think logically here. If it was that easy and so much cheaper don’t you think it would have taken off like wildfire? Threw some nice supercharged 550hp LS stuff in wakeboard boats that would likely be a beyond suitable replacement for say the 525. Again the results are always in the boat. The paper numbers always work and yet real world hasn’t |
Originally Posted by mggdoors
(Post 4685272)
How the hell are you 20k in two stock bottom end iron headed bbc? Did the pope own them? Post your dyno sheets and specs |
Originally Posted by mggdoors
(Post 4685265)
Thats cute. Those are going to be STOCK everything with a cam, carb, intake. He could give two ****s if he does 70. Im really starting to enjoy the ball busting. Really makes me appreciate posting this build. Maybe Ill do some 1000hp prius motors next or get a chevy volt that was crashed and stuff that in a trash barge and take a poker run by storm. |
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