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Latest News  >  Fuel Efficiencies

Extracting as much performance as possible from the jet unit/engine combination is essential.

The main advantage of the Scott 852 is that it will be able to harness every unit of horsepower this engine produces and turn it into performance. The supercharged 6.0 litre Chev (depending on the version) will produce approx 500 hp and maximum torque at approx 4,800. When HCM order the unit (and give engine details), Jeff (our dealer) will configure the jet to match the engine.

It might be useful if I explain why the Scott 852 is the right choice for performance. This engine will produce approx 500 hp at 4,800 revs - so there is absolutely no point (or advantage) loading up the jet unit to run the engine "wide-open" at 3,800 (as is done with jet units from other manufacturers) - as this limits the output of the engine and consequently boat performance (it is also hard on the engine - increasing wear). At 3,800 revs the output of the engine would only be approx 340 hp - while burning fuel full throttle, and wasting 160 hp. Not a good combination! The Scott 852 will easily rev thru to 6,500 rpm so the jet and engine rpm output will be matched from idling through to maximum revs.

The benefits of matching the engine with the correctly configured jet (and extracting maximum performance) are;
• More out of the hole speed and general acceleration (as the engine reaches peak output quicker)
• Higher top end speed
• Higher load lifting and mid-range power (because the engine and jet are matched thru the rpm range)
• Less engine wear (these engines are designed to be run at maximum output. Some engine manufacturers will not warranty their engines unless they can achieve maximum output, as the potential for engine damage when high loads are applied to an engine outside its ideal rpm range can be high)
• Much better fuel economy (as the throttle opening will be low - as opposed to labouring at full throttle openings with the engine at full load at 3,800 revs - which uses a lot more gas). We hear gas is getting expensive!

An analogy we use to explain why loading a jet unit to restrict engine rpm is so undesirable - is that it is like driving a car with the parking brake on.

Here at Scott we have specialised in building jet-units for competition and the decades of experience, testing and challenges involved in producing jets to win in competition mean we have a real performance focus. Many customers are staggered that the performance advantages our jets have over our competitors come with better fuel economy and reduced maintenance (I suppose a valid comparison might be how Porsche's race experience has produced high performance, low maintenance engines with good fuel economy).

While on the subject of competition I was surprised to find out last week that all the competitors in the US sprint boat Superboats and Group A classes use our jets - many with the Scott 852 sprint model, with engines producing up to 1400 hp. They are individually free to choose their jet supplier.

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MeanChicken.net
Northwest (US) river jet boating and discussion online forum
www.meanchicken.net

NZJSA
Jetsprint Technology
Evolution of Jet Unit (Pump)
www.jetsprint.co.nz

Argonautica Ltd
Manufacturers of high performance pontoon boats using Scott waterjets.
www.argonautica.co.nz

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