How do you "Dyno Test" a boat?
Have you ever dealt with C.A.R.B.? I have been dealing with them for over...well, hell, over 25 years.
They are ALL about emissions, not horsepower. They could give a rat's ass about how fast a boat goes, they just don't want it spewing emissions.
They get most of their data directly from the manufacturer. When they are contemplating new restrictions or imposing stricter regulations they will do engine testing. Usually in conjunction with a major manufacturer (s) who donates an engine and parts such as catalytic converters, etc. They do it in a lab, on an engine stand and the engine is hooked up to a water supply. They have to simulate load factors, etc. since there is no prop to create load on the engine. The lab really doesn't simulate real life conditions since the engines need to be run rich to keep cylinder temps down. The production engines run much leaner and they have to calculate all the variables when they approve emissions packages on these engines. They use ISO Standards, NOT SAE, ISO 8178-4 E4* to be exact.
@Williamsone46 was just hi-lighting the games that manufacturers play in their advertising and spec numbers. It's all smoke and mirrors. You want to know how fast a boat goes? Get in it and run it hard.
Yeah you are passing a lot of bad info. Sorry but that is fact.
Its kind of simple actually, they dyno test the ENGINES that are going to be used in the car/truck/motorcycle/atv/SxS/boat/etc etc etc
The load placed on an engine has no bearing on the power output of the engine. It does not matter that there is no prop the engine puts out what it puts out, end of story. The entire point of a dynamometer is to put a load on an engine and measure it's power output. In this case they are also monitoring it's emissions as well.
The engine has to be tested every year to be certified for use in the vehicle, not "when they are contemplating or imposing stricter regulations" like you are claiming. Certs are only good for specific models and model years tested. They are required to be tested or they cannot be sold in California. If you really think the program counts on manufacturers donating parts then you simply have no clue about the process even though you are acting like you do. The manufacturers have to PROVIDE what they intend to sell, or they will not be allowed to sell it.
The engines are not run rich, they are run as they will be in the vehicle. The production engines cannot be "leaner" in fact it specifically states in the certs that the production engines have to be the same. The manufacturer has to submit a lot of info on how the engine will operate in the vehicle. If any engine if found later to be different than the test engine in operation or emissions the manufacturer can be fined quite heavily, and ARB does do its own random testing to verify that companies are complying.
The ISO standard you listed is for an emissions test, which California actually sets their own standard, but anyway we were talking about power in this thread, which is an SAE standard when the engine is dynamometer tested which is what ARB does with the submitted sample engine.
Here is the wording under California CCR's, you can argue with them about how they calculate power if you wish:
(B) For 2009 and subsequent model year engines, each boat manufacturer must install an enhanced evaporative control system on every boat that is manufactured for sale, sold, or offered for sale in California that uses a high performance engine.
(3) Compliance with the standards on a corporate averaging basis is calculated as follows:
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where:
n = Total number of engine families available for averaging
PRODjx = Number of engines in engine family j produced for sale in California in model year x.
ELjx = The measured HC+NOx emission levels for engine family j in model year x.
Pjx = The average power in kW (sales-weighted) of engine family j produced for sale in California in model year x. Engine power must be calculated using SAE standard J1228, November 1991, incorporated herein by reference.
(1) Jet Boat Engines
(A) Jet boat engine families previously certified to the HC+NOx standards for outboard engines and personal watercraft in § 2442(a) may continue to be certified to those standards until 2012 with the additional requirement for 2010 and subsequent model years to comply with the applicable carbon monoxide standards for OB/PWC engines in Table 1.2.
(B) Beginning in 2010, all new jet boat engine families shall comply with the standards for sterndrive/inboard engines in § 2442(b) upon introduction, except that these new jet boat engine families may be cross category averaged with any other jet boat or personal watercraft engine family to comply with those standards until 2012.
1. Notwithstanding subparagraph 2. below, an engine family certified to the § 2442(a) standards prior to 2010, but not previously used in a jet boat application would be considered a new jet boat engine family in 2010.
2. Replacements for discontinued jet boat engine families. In 2010 and 2011, if a jet boat engine certified to the § 2442(a) standards prior to 2010 is discontinued, the manufacturer may introduce a replacement engine family that complies with the § 2442(a) standards, provided that the replacement engine family is certified to an FEL at or below the certified emissions level of the family it replaces.
(C) Jet boat engines previously certified in the same engine family with personal watercraft engines must be certified separately and to a unique engine family beginning in 2012. All other jet boat engines, including replacements for discontinued jet boat engine families, must be certified separately and to a unique engine family beginning in 2010.
(D) The OBD-M requirements in § 2444.2 would apply to new jet boat engine families in 2010 and to all jet boat engine families in 2012.
Here is the cert for the 2015 Yamaha's:
http://www.arb.ca.gov/msprog/offroad/cert/eo/2015/sime/u-w-003-0284.pdf
Here is the cert for 2015 BRP engines to be sold for use in JET BOATS:
http://www.arb.ca.gov/msprog/offroad/cert/eo/2015/sime/u-w-008-0226.pdf
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