PCM H5DI 5.3l

[jjackkrash]

I am 95% on buying a 200 with the PCM H5DI 5.3l in the next day or two. I have pretty much talked myself out of needing the 6.2, despite consciously and subconsciously wanting redonkulous power on tap.

All that said, any owners have anything good, bad, or indifferent to say about this engine? Personal experiences to share? The reports I have seen say its a direct replacement for the 6.0l, with maybe snappier bottom end and less top end.

Thanks in advance.

[Sailfun]

I demo'd a 2016 G23 with the 5.3 and it did surprisingly well even with full ballast and 4 people. I would think that engine would be a great match for the 200. Keep in mind that in the past engines were rated differently. If the old 350hp 5.7 liter is rated as engines now are it was a 295 to 300 horse engine verses 355 in the 5.3.

[bandit628]

I have the 5.3 liter in my 2015 Chevy does great. I realize auto is different than marine, but from what I have heard it is great in a boat as well.

[jjackkrash]

If the old 350hp 5.7 liter is rated as engines now are it was a 295 to 300 horse engine verses 355 in the 5.3.

I am just curious, PCM has been rating the 5.7 as 343HP for as long as I can remember, when did the rating system change?

[Quinner]

Keep in mind that in the past engines were rated differently. If the old 350hp 5.7 liter is rated as engines now are it was a 295 to 300 horse engine verses 355 in the 5.3.

I am just curious, PCM has been rating the 5.7 as 343HP for as long as I can remember, when did the rating system change?

Curious as well, what changed with the HP rating system??

Jack, the 5.7 Excal was initially 330hp when introduced in 2002, in 2008 PCM did some tuning/software changes which increased the HP to 343.

[Evening Shade]

I think what Sailfun is referring to is the old way that horsepower ratings were reported. 30-40 years ago HP ratings from the manufacturer were Gross HP ratings. Now everyone uses Net HP ratings. So that 1970 Chevelle SS with the LS6 454 that was rated at 450hp in 1970 would be rated closer to 375hp by todays standards. Net HP ratings have been the standard for at least over 25 years and maybe longer.

[jjackkrash]

Its interesting, the reports on ball of spray are that the H5 is a direct replacement for the 6.0l, and might be snappier out of the hole, with a little less top end. It sure does not seem to have much more HP than the 5.7; I guess it has a better torque curve.

[FunkyBunch]

Have the H5 in my G21 IMO it is a great motor. I have not had any issues this year with and it gets the boat on plane fully loaded with no issue. I tested a G21 with the H6 and there is a noticeable difference in the 2. I went with the H5 anyway as I did not think I needed the extra speed. The H5 was a considerable amount faster to plane fully loaded and gets better fuel economy than my previous boat so I am perfectly happy. My understanding is the motor has more torque than the outgoing 6.0 even though the HP is down.

If I was looking at the G23 I would not get the H5 because of the extra weight of the boat and additional ballast I would run in that boat. The resale of G23 with an H5 would also be more of a concern in that boat.

[Miljack]

Good posts on the new DI engines! This subject is very interesting to me due to the improved tech going into the new marine engines. After going from a Python engine equipped boat and believing that I would never be happy with a small block variant, I can say that our 230 with the LS 6.0 is a "better" engine. The LS has excellent torque out of the hole, runs very smoothly at all engine speed, and provides good fuel economy.
Given that the next development is direct injection, I can see why people are commenting on the "snap" and "torque" of these power plants. The "main" item here is the high static compression ratio allowed by the high efficiency of the DI system, which helps to alleviate detonation typically seen in "old tech" high compression engines. Think of it this way; the DI engines can run 11.0-1(+) compression ratios, this allows the engine to make low RPM power due to the (volumetric efficiency) efficiency of the combustion process. Think supercharger which introduces "forced induction" at low RPM's, the higher static compression ratio is achieving the same effect of the supercharger down low, and, has the added benefit of the increased fuel effficieny.

[jjackkrash]

@Mlijack, I hope it rocks because I just bought one. Apparently the DI engines are also quieter. They sound like the bees knees.

[josemolino]

Good posts on the new DI engines! This subject is very interesting to me due to the improved tech going into the new marine engines. After going from a Python engine equipped boat and believing that I would never be happy with a small block variant, I can say that our 230 with the LS 6.0 is a "better" engine. The LS has excellent torque out of the hole, runs very smoothly at all engine speed, and provides good fuel economy.
Given that the next development is direct injection, I can see why people are commenting on the "snap" and "torque" of these power plants. The "main" item here is the high static compression ratio allowed by the high efficiency of the DI system, which helps to alleviate detonation typically seen in "old tech" high compression engines. Think of it this way; the DI engines can run 11.0-1(+) compression ratios, this allows the engine to make low RPM power due to the (volumetric efficiency) efficiency of the combustion process. Think supercharger which introduces "forced induction" at low RPM's, the higher static compression ratio is achieving the same effect of the supercharger down low, and, has the added benefit of the increased fuel effficieny.

Hola,
Any thoughts on fuel consumption? I have a G21 with 6.0 409hp. Here in Europe, fuel consumption is an issue. (A Gallon may vary between $5 & 6,8)
I am considering to change to DI but there is no info regarding fuel consumption.

Regards,

[peter43]

I have the H5 in my G21. I am really impressed with it. I was skeptical until I test drove one. Great hole shot when fully loaded. I have not maxed it out yet. Fuel economy is great too.


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[jjackkrash]

Anyone know what the RPM redline is on the H5DI?

[jjackkrash]

Found the manual on here. 5600.

[jjackkrash]

Anyone know of any charts showing GPH fuel-burn rates at various cruising RPMs for this engine?