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Author Topic:   Turbo Charging

deepwater posted 02-17-2007 05:55 PM ET (US)
Are small turbo chargers made for outboard motors?
JBCornwell posted 02-17-2007 07:06 PM ET (US)
Not to my knowledge, Deepwater. I don't think turbocharging would work on a two-stroke. Any back pressure at all kills performance and interferes with scavenging.
What engine (make and model) are you interested in?
Red sky at night. . .
JB
Teak Oil posted 02-17-2007 11:00 PM ET (US)
It would be much cheaper and easier to simply sell your motor and buy a bigger one. Trust me
runpasthefence posted 02-18-2007 12:15 AM ET (US)
Land-n-Sea once sold an outboard motor turbo charging "kit". I've heard of a couple of instances where people were able to make this work. The majority of the time, however, it turned outboards into grenades...then anchors.
These kits were basically impossible to set up correctly, were very expensive (and still are if you can find one), and are no longer in production (I'm pretty sure Land-n-Sea is only in the Dyno business now).
Also, JB is right on.
An alternative would be a nitrous oxide kit from HydroDynamics.
See http://hydrodynamics-usa.com/index.php?option=com_content&task=category& sectionid=4&id=67&Itemid=44
Mick
deepwater posted 02-18-2007 01:08 AM ET (US)
I was just wondering ,,all the want and need to go fast i never saw a link about turbos or any atempt to increase the air into a motor above the factory asperated specs,,,,anyone have any ideas <<?
myakka posted 02-18-2007 08:06 AM ET (US)
Its all been done, from velocity stacks to supercharging(Verado)
JBCornwell posted 02-18-2007 08:14 AM ET (US)
Deepwater, I raced karts in the late 50s-early 60s.
In those days we started with air cooled 2 stroke chainsaw engines.
These are some of the methods we used to increase horsepower to as much as 3-4 times stock.
* Larger carbs or multiple carbs.
* "Maverick" magneto ignition and/or recurved ignition timing.
* Custom reed boxes with more, larger and higher frequncy reeds.
* Added piston port induction.
* Reduced crankcase volume to increase scavenging pressure.
* Retimed, enlarged and reshaped ports.
* Increased compression ratios.
* Added ports to combine cross- and loop scavenging.
* Added bike-style exhaust extractors.
We usually burned methanol/ether/castor oil mixes but sometimes burned methanol diluted nitromethane glo-plug fuel.
These engines turned 10,000 to 16,000rpm and made 2-4hp per ci. They lasted from 2 to 4 hours.
Most of those old tricks would probably work on water cooled 2 strokes and produce similar results.
Red sky at night. . .
JB
deepwater posted 02-18-2007 10:23 AM ET (US)
thanks ,,its something to think about
Wasatch Whaler posted 02-18-2007 02:26 PM ET (US)
Last year I was snowmobiling with about 6 other guys. We were all trying to climb this one hill. The best any of us could do, and some guys had nitrous oxide injection, was get about 2/3 of the way up and then have to turn out (or get stuck).
This other guy shows up with a turbocharged two stroke sled. He went over the top and he did it easily. It was absolutely amazing to watch... imagine showing up to a WWII dogfight with an F-16 and you get the idea.
His was a custom setup and really looked nice, but all that stuff fit under his hood. I think it would be a huge challenge to make a turbocharged outboard with all its exhaust plumbing look really good.
Jay
Teak Oil posted 02-18-2007 08:26 PM ET (US)
There are several companies that make turbos for two stroke sleds but they are 3-4000 dollars. Also the extreme heat of a turbo would mean you could not run a cowl on your motor.
If you want to hop up your current motor, do some research on shaving the heads, getting some Boyesen reeds, and richening the carbs a little. You will need premium gas for the rest of the motors lofe also
runpasthefence posted 02-18-2007 08:41 PM ET (US)
Here is a picture of the Land-n-Sea turbo http://img.photobucket.com/albums/v611/yeahtoast02/tn_turbomerc.jpg
http://img.photobucket.com/albums/v611/yeahtoast02/tn_turbomerc2.jpg
You can find a huge amount of info at the following link http://forums.screamandfly.com/forums/
Their database is currently down, probably due to high traffic resulting from the Miami Boat Show, so check back in a few days.
Mick

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Author	Topic: Turbo Charging
deepwater	posted 02-17-2007 05:55 PM ET (US) Are small turbo chargers made for outboard motors?
JBCornwell	posted 02-17-2007 07:06 PM ET (US) Not to my knowledge, Deepwater. I don't think turbocharging would work on a two-stroke. Any back pressure at all kills performance and interferes with scavenging. What engine (make and model) are you interested in? Red sky at night. . . JB
Teak Oil	posted 02-17-2007 11:00 PM ET (US) It would be much cheaper and easier to simply sell your motor and buy a bigger one. Trust me
runpasthefence	posted 02-18-2007 12:15 AM ET (US) Land-n-Sea once sold an outboard motor turbo charging "kit". I've heard of a couple of instances where people were able to make this work. The majority of the time, however, it turned outboards into grenades...then anchors. These kits were basically impossible to set up correctly, were very expensive (and still are if you can find one), and are no longer in production (I'm pretty sure Land-n-Sea is only in the Dyno business now). Also, JB is right on. An alternative would be a nitrous oxide kit from HydroDynamics. See http://hydrodynamics-usa.com/index.php?option=com_content&task=category& sectionid=4&id=67&Itemid=44 Mick
deepwater	posted 02-18-2007 01:08 AM ET (US) I was just wondering ,,all the want and need to go fast i never saw a link about turbos or any atempt to increase the air into a motor above the factory asperated specs,,,,anyone have any ideas <<?
myakka	posted 02-18-2007 08:06 AM ET (US) Its all been done, from velocity stacks to supercharging(Verado)
JBCornwell	posted 02-18-2007 08:14 AM ET (US) Deepwater, I raced karts in the late 50s-early 60s. In those days we started with air cooled 2 stroke chainsaw engines. These are some of the methods we used to increase horsepower to as much as 3-4 times stock. * Larger carbs or multiple carbs. * "Maverick" magneto ignition and/or recurved ignition timing. * Custom reed boxes with more, larger and higher frequncy reeds. * Added piston port induction. * Reduced crankcase volume to increase scavenging pressure. * Retimed, enlarged and reshaped ports. * Increased compression ratios. * Added ports to combine cross- and loop scavenging. * Added bike-style exhaust extractors. We usually burned methanol/ether/castor oil mixes but sometimes burned methanol diluted nitromethane glo-plug fuel. These engines turned 10,000 to 16,000rpm and made 2-4hp per ci. They lasted from 2 to 4 hours. Most of those old tricks would probably work on water cooled 2 strokes and produce similar results. Red sky at night. . . JB
deepwater	posted 02-18-2007 10:23 AM ET (US) thanks ,,its something to think about
Wasatch Whaler	posted 02-18-2007 02:26 PM ET (US) Last year I was snowmobiling with about 6 other guys. We were all trying to climb this one hill. The best any of us could do, and some guys had nitrous oxide injection, was get about 2/3 of the way up and then have to turn out (or get stuck). This other guy shows up with a turbocharged two stroke sled. He went over the top and he did it easily. It was absolutely amazing to watch... imagine showing up to a WWII dogfight with an F-16 and you get the idea. His was a custom setup and really looked nice, but all that stuff fit under his hood. I think it would be a huge challenge to make a turbocharged outboard with all its exhaust plumbing look really good. Jay
Teak Oil	posted 02-18-2007 08:26 PM ET (US) There are several companies that make turbos for two stroke sleds but they are 3-4000 dollars. Also the extreme heat of a turbo would mean you could not run a cowl on your motor. If you want to hop up your current motor, do some research on shaving the heads, getting some Boyesen reeds, and richening the carbs a little. You will need premium gas for the rest of the motors lofe also
runpasthefence	posted 02-18-2007 08:41 PM ET (US) Here is a picture of the Land-n-Sea turbo http://img.photobucket.com/albums/v611/yeahtoast02/tn_turbomerc.jpg http://img.photobucket.com/albums/v611/yeahtoast02/tn_turbomerc2.jpg You can find a huge amount of info at the following link http://forums.screamandfly.com/forums/ Their database is currently down, probably due to high traffic resulting from the Miami Boat Show, so check back in a few days. Mick