Mercury's Turbo Engines
12-18-2009, 03:33 PM
#21
PF Marine
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12-18-2009, 03:53 PM
#22
SeaRay Sundancer
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I have a bad taste with turbo lag I had with a car engine. I am told the turbos are much better now. In and out of the throttle in big water would be a problem with any kind of lag even slight. The next response will be they have the lag sorted out. How can you have zero lag when you are off the throttle and killing the exhaust in a wave hop? You need to spool up the engine to get boost. A roots or Whipple has instant response. Hair dryer style superchargers are another blower I do not like. Take too long to spool up. I remain skeptical.
Maybe VG turbos are the answer?
12-18-2009, 04:55 PM
#23
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I have a bad taste with turbo lag I had with a car engine. I am told the turbos are much better now. In and out of the throttle in big water would be a problem with any kind of lag even slight. The next response will be they have the lag sorted out. How can you have zero lag when you are off the throttle and killing the exhaust in a wave hop? You need to spool up the engine to get boost. A roots or Whipple has instant response. Hair dryer style superchargers are another blower I do not like. Take too long to spool up. I remain skeptical.
12-18-2009, 05:48 PM
#24
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Properly sized twins should not have lag, but they are much more complex, requiring custom headers, custom cooling and an engine fed oiling system. I would rather have a 572 with a 8.3L Whipple for cost and simplicity any day.
12-18-2009, 06:19 PM
#25
Chris
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Chris
12-18-2009, 06:31 PM
#26
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Those engines did not work very well at all. No torque and engines kept breaking. My take on turbos is they are still unproven in a boat. If they worked so well why are there not more boats with them? I keep hearing they are great yet where are they? Who is running them? Not little boats but offshore boats.
Racer
12-18-2009, 06:56 PM
#28
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12-18-2009, 07:13 PM
#29
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12-18-2009, 07:25 PM
#30
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Turbo's
Most of the efficiency come's from the lack of hp loss driving the blower. On a 900 hp blower motor it takes over 175 hp to turn the blower at 100% HP. The motor really has to make 1100 hp to see 900 at the crank. Turbo motors have very little parasitic loss so you see all the HP at the crank. Exaust temps on turbo gas motors are way harder to control at 100% HP. Blowers are more consistent. With all the new computer controls on engines these days I would think that a reliable production marine gas turbo 700+hp engine would be around the corner.
