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5.7 or 6 Liter?


Horton
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Our boat is a 1997 local Aussie built boat from a small manufacturer & running a Carby 6.6 litre (Spelling correct). Probably less than 20 built. Wakes Great at 22 & shorter.

 

We average 10.9 Litres (correct spelling again), (2.9 US gal/hour) over the past 15 years.

Bit of slow stuff in that, but if it's a slalom only 32+ outing we burn about 14 Litres/Hour max.

 

Baselines for 34 & 36 are 2890 & 3070 rpm. Think our consumption is so good because the big cubes of the 400 Chev is doing it so easy.

 

They guy that built it has done a few 350's & recons they are lucky to get below 15 litres/hour & run about 600 revs higher at 36.

 

Bigger is working easier in my books.

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Of the three boats I ski with all have 6 liters.

Cory's has a 197 with a six liter, we put a 5.7 cupped prop on it it ski's very nice.

Regina's 6 liter Malibu TXI skied really nice till it got sent up for the Malibu open and came back with the jump prop.

And My 200 with a 6 liter is very impressive with the OJ wheel on.

 

In Florida you have about a 50% chance of getting a six liter in tournament. I have had 5 six liter's now in my Nautiques with many of them pulling a number of National slalom records in a number of divisions.

Great modern design and better power to weigh ratio over the old 50's design SBC. I give it another 5 years and the SBC will be like the 5.8 and the modern LS design engines will be the norm. Look for Indmar or Ilmor to offer a Hemi!

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I had an 05 SN 196 with a 6 liter and it was not as quick to speed as the 5.7 liter. Really the boat with the 5.7 felt better. That was a long time ago, but it felt like most of the torque came in at too high of an rpm. We have used the 5.7 liter on the Big Dawg exclusively, why I don't know for sure, could be just for continuity for the skiers. Most are slalom specialists who don't need the 6 liter for jump.

When I ordered my 2011 SN, I contemplated it, but I believe it was 6K option, was not worth it to me.

I did like the closed cooling of the 6 liter, I think all marine engines should have this and it was a smoother, more well balanced engine. The 6 liter is a nice piece, but hard to justify if you are just a slalom skier and not a high end jumper or barefooter. The 343 Cat engine in my 2011 SN 200 feels much stronger than the 2010. I heard rumors that it is actually stronger due changes in the DBW/zero off. I run the 422 prop on a short lake and it works very well.

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Didn't they use the 6.0 CC200's when the Big Dawg was at Laku in Colorado a couple of years ago? I am sure they used at least one. You have to have a 6.0 engine in the 200 at altitude. This is especially true if you have any kind of a short setup.

 

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@Gloersen - I can't say if any of the Big Dawg skiers prefer the 6 liter or not. At the finals, we only had one 6 liter 200, so it was ruled out from the start due to the head to head format. Personally, I ski better behind the 6 liter 200 (or at least feel better) for some reason.
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Thanks for the correction, didn't go to LAKU. I haven't spent enough time behind the 6 liter to have an opinion. The only times I have skiied behind one I was at a different site, different driver. Couldn't really tell much difference in the boat. Greg Davis told me at least last year he or(they Nautique) intended on using the 5.7 at the Big Dawgs.
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