New Supercharged Marine Rotax

[Jay]

Has anyone here done anything with the new 3 jug 4 cycle supercharged
engines they're making now? Something like 215HP

http://www.seadoo.com/en-US/Watercrafts/2004/Musclecraft/RXP/Specs.htm



Type Supercharged four-stroke, three-cylinder Rotax® SOHC with
Intercooler


Bore x Stroke 100mm x 63.4mm

Displacement/hp 1494 cc / 215 hp

Compression ratio 8.5:1

Carburetion / Fuel injection Multi-port fuel injection

Lubrication Dry sump, pressure oil system

Cooling Closed-loop cooling system

Fuel type Regular unleaded

[Regnirps]

(Jay) wrote:

>Has anyone here done anything with the new 3 jug 4 cycle supercharged
>engines they're making now? Something like 215HP.

It was well described in Popular Science (I think). The SC is mounted to the
front to keep the profile low. Note that is it supercharged, not turbocharged
-- no waiting for boost. 3 cylinder 4 valve, O to 30 in 1.6 seconds and 0 to 60
in 5.1 or some such waterborne insanity : )

Closed loop cooling is good. I was afraid it needed a steady suppy of cool sea
water!

I think the power rating was ta over 5,000 RPM so there might be a weight
penalty for a health reduction drive.

Numerous applications came to mind!

-- Charlie Springer

[Ed Bryant]

"Regnirps" > wrote in message
...
> (Jay) wrote:
>
> >Has anyone here done anything with the new 3 jug 4 cycle supercharged
> >engines they're making now? Something like 215HP.
>
> It was well described in Popular Science (I think). The SC is mounted to
the
> front to keep the profile low. Note that is it supercharged, not
turbocharged
> -- no waiting for boost. 3 cylinder 4 valve, O to 30 in 1.6 seconds and 0
to 60
> in 5.1 or some such waterborne insanity : )
>
> Closed loop cooling is good. I was afraid it needed a steady suppy of cool
sea
> water!
>
> I think the power rating was ta over 5,000 RPM so there might be a weight
> penalty for a health reduction drive.
>
> Numerous applications came to mind!
>
> -- Charlie Springer
>
We've all seen the V-TEC that Bombardier is working on for Aviation... on a
Moose now, but not planned for homebuilts soon.

I think given that there are electronic sensors for both engine overhead,
and exhaust overheat means that the engine is not meant to run flat out...
who really wants to run their SeaDoo at 90 mph all day?

I'd estimate a 40 mph cruise wouln't take more that 40 or 50 HP, well under
the peak.

Put the engine in a plane, and it'd melt.

Ed.

[Regnirps]

"Ed Bryant" wrote:

>I think given that there are electronic sensors for both engine overhead,
>and exhaust overheat means that the engine is not meant to run flat out...
>who really wants to run their SeaDoo at 90 mph all day?

>I'd estimate a 40 mph cruise wouln't take more that 40 or 50 HP, well under
>the peak.

>Put the engine in a plane, and it'd melt.

Unless those sensors are there to prevent damage when it is run out of the
water for cleaning and rinsing salt out and such. I'd guess it is meant to run
WOT all day long towing inner tubes and wake boards.

-- Charlie Springer

[Jay]

In this case, does "closed loop" mean closed circuit, like there is a
water to water heat exchanger or does it mean simply that it has a
thermostat?

215HP: what would the equivalent Lycoming be from a HP standpoint,
IO-360?

Regards

(Regnirps) wrote in message >...
> (Jay) wrote:
>
> >Has anyone here done anything with the new 3 jug 4 cycle supercharged
> >engines they're making now? Something like 215HP.
>
> It was well described in Popular Science (I think). The SC is mounted to the
> front to keep the profile low. Note that is it supercharged, not turbocharged
> -- no waiting for boost. 3 cylinder 4 valve, O to 30 in 1.6 seconds and 0 to 60
> in 5.1 or some such waterborne insanity : )
>
> Closed loop cooling is good. I was afraid it needed a steady suppy of cool sea
> water!
>
> I think the power rating was ta over 5,000 RPM so there might be a weight
> penalty for a health reduction drive.
>
> Numerous applications came to mind!
>
> -- Charlie Springer

[Jay]

I would concur, running wide open isn't a melt issue, if it can do it
for 60 seconds it can do it for an hour. It will reach steady state
temperature very quickly being as light as it is, from that point on,
all waste heat goes out into the environment. The TBO is likely
effected but as cheap as these things are (being high volume
uncertified) who cares.


(Regnirps) wrote in message >...
> "Ed Bryant" wrote:
>
> >I think given that there are electronic sensors for both engine overhead,
> >and exhaust overheat means that the engine is not meant to run flat out...
> >who really wants to run their SeaDoo at 90 mph all day?
>
> >I'd estimate a 40 mph cruise wouln't take more that 40 or 50 HP, well under
> >the peak.
>
> >Put the engine in a plane, and it'd melt.
>
> Unless those sensors are there to prevent damage when it is run out of the
> water for cleaning and rinsing salt out and such. I'd guess it is meant to run
> WOT all day long towing inner tubes and wake boards.
>
> -- Charlie Springer