How to get 42mph out of a SN 200?

[chris196]

they do adjust for octane.
I don't know what's recommended for these engines, but you have to understand what higher octane does. It actually slows down combustion. So, sometimes higher octane actually produces less power from a given engine. The most power will be achieved from the lowest octane that doesn't produce pre ignition(pinging).
You want to be at the optimal point of no pinging and getting the most energy out of the explosion of the gas.
If your octane is too low, then timing is retarded so as to avoid pinging, again robbing power.

[2gofaster]

Our 2011 200 ran 41.8 with 1 hour on it. After putting an Acme 422 on it, it runs right at 44. I've pulled barefooters at 42.

[jharris]

i checked my 200 with the 343 running an Acme 422 prop. I was able to hit 43.7 on the ZO running with the gate up. I would definitely look at changing the stock prop over the the Acme 422. I picked up a couple of MPH and I like the pull just as well.

[DieselDawg]

i checked my 200 with the 343 running an Acme 422 prop. I was able to hit 43.7 on the ZO running with the gate up. I would definitely look at changing the stock prop over the the Acme 422. I picked up a couple of MPH and I like the pull just as well.

Why not get the boat certified with two different props? The 422 seems to perform better (for some people) than the stock 654. If your not pulling a tournament throw on the 422 and see how she does. Maybe ACME will come out with a prop that will work for all water sport disciplines. Another question: Does the boat run out of horsepower with the 343 or does the engine run out of prop, when trying to obtain a higher top speed?

Matt

[EntiatSkier]

Our 2011 200 ran 41.8 with 1 hour on it. After putting an Acme 422 on it, it runs right at 44. I've pulled barefooters at 42.

Aren't you suppose to be breaking these things in, first?? ;-)

[DanielC]

Running an engine WOT, to max RPM for very brief periods of time is breaking it in.
It is how you seat the rings.
Do not hold it there, and always change throttle opening, from WOT to full closed. Do not put a load on the boat early in the engines life, either.

[TRBenj]

Why not get the boat certified with two different props? The 422 seems to perform better (for some people) than the stock 654. If your not pulling a tournament throw on the 422 and see how she does. Maybe ACME will come out with a prop that will work for all water sport disciplines. Another question: Does the boat run out of horsepower with the 343 or does the engine run out of prop, when trying to obtain a higher top speed?

Matt

I thought the 1868 (12.5x14.25) was the stock prop on the Excal boats? If that prop runs up against the limiter (not sure where its set on that motor) then dialing back the RPM's with a steeper prop should speed it up. I would think that the 422 would almost be too much for that hull/engine combo though... something in the 12.5x15 range like the 470, 1442 or 654 might be better.

What prop comes stock on the 409 powered 200?

[2gofaster]

Aren't you suppose to be breaking these things in, first?? ;-)

I'm an engine builder who has built everything from Pro Stock 1400hp big blocks to turbocharged 2000HP small block Fords. One of the first things I learned came from Smokey Yunick. He told us that an engine was broken in by the end of the first pass down the drag strip. We'd just let the engine coast down against itself. If it's not broken in then, it never will be. Boats make it easy to coast down against the prop load at high vacuum after a full throttle run. In all of our engine dyno testing, the ones we flogged consistently made more power under the curve in comparison to the ones we babied.

[2gofaster]

I thought the 1868 (12.5x14.25) was the stock prop on the Excal boats? If that prop runs up against the limiter (not sure where its set on that motor) then dialing back the RPM's with a steeper prop should speed it up. I would think that the 422 would almost be too much for that hull/engine combo though... something in the 12.5x15 range like the 470, 1442 or 654 might be better.

What prop comes stock on the 409 powered 200?

Stock prop on the 343 is the 1868. Stock prop on the 409 is the 654. It's a good touranment approved compromise to the non tournament approved 422 on a Exc343. It turns about 100 more rpm than the 422 and 400less than the 1868.

[TRBenj]

Stock prop on the 343 is the 1868. Stock prop on the 409 is the 654. It's a good touranment approved compromise to the non tournament approved 422 on a Exc343. It turns about 100 more rpm than the 422 and 400less than the 1868.

Good info. Id be curious to know what RPM each of these turn on a 200 at WOT.

Whats the rev limit on the Excal? I know its 5600 on the 409.

[AirTool]

I'm an engine builder who has built everything from Pro Stock 1400hp big blocks to turbocharged 2000HP small block Fords.

Shane, go over to the Supercharged 230 thread and tell us what kind of small block Chevy we could build from scratch for $25K. Perhaps using parts from PAW or other.

[skierjp]

Go to barefoot school and learn to barefoot correctly

[Skithreelakes]

Thank you all for some the constructive comments. This has been helpful! We have our '99 up for sale and hope to get into a used 200 by next season! Will follow up on this thread once we've had time to research results for ourselves.

As for SkierJP, you are correct that good technique can allow for slower boat speeds, however, different barefoot disciplines require different speeds....and to that end, barefoot competitions allow a skier up to 43 mph AND require towboats to make 44mph while under load. So my original question is certainly a valid one and should not be dismissed with a blanket statement such as you have given.

[skierjp]

Sorry I didn't mean for it to come across that way. I live in the middle of barefoot central ( Winter Haven FL. ). Most footers that go to barefoot school are usually told they are going way to fast. I do barefoot but only a few times a year. You will probably want the Hydrogate in the Trick/Jump position for footing, this will give you another 1 or 2 mph plus a smoother wake for wake crossings.

Make sure you check out the Promo Boat listings when you get ready to purchase. These boats usually are great deals and low hours. Most of them are like brand new because the Team Members are expected to sell them each year. Let me know where you live and I can give you some names.

[swc5150]

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