new pcm motors

[Whitetail15]

any info on these engines. The H6 direct injection 6.2 is the replacement for the 409,450? How is it cooled?

[Beg4wake]

5.3L H5 - 355 HP, 405 ft/lb
6.2L H6 - 450 HP, 465 ft/lb
6.2L Supercharged H7 - 550 HP, 545 ft/lb

These ratings are all using 87 octane gas, except the 550. Using premium will increase these numbers, but Nautique wanted to publish the lowest numbers so any improvement would just be icing on the cake.

That was from a previous thread posted by NautiqueJeff

They will still be cooled the same as before...open cooling for the normal engines, closed cooling for the coastal engines. I also believe these new engines have a little more torque than previous generations. Don't quote me on that but I feel like I read that somewhere.

[Tallredrider]

"5.3L H5 - 355 HP, 405 ft/lb
6.2L H6 - 450 HP, 465 ft/lb
6.2L Supercharged H7 - 550 HP, 545 ft/lb

These ratings are all using 87 octane gas, except the 550. Using premium will increase these numbers, but Nautique wanted to publish the lowest numbers so any improvement would just be icing on the cake."

That was from a previous thread posted by NautiqueJeff

They will still be cooled the same as before...open cooling for the normal engines, closed cooling for the coastal engines. I also believe these new engines have a little more torque than previous generations. Don't quote me on that but I feel like I read that somewhere.

The current 450 is a hybrid cooling system. Please forgive if that is not the exact term. But the antifreeze actually cools the engine, then goes to a heat exchanger that is cooled by lake water, basically a radiator like on a car. So Lake water never gets to my engine. But it is not completely sealed like the coastal engines, and not completely water cooled like most other boats.

[Tbone33]

thinking about a 2016 SAN230. I was pretty set on the 409 on the 2015. Is the H5 gonna cut it? Dealer says its equal to the 2015 engine.

[NautiqueJeff]

I drove a G21 with the H5, and with full stock ballast (2,850 lbs.) plus three or four people, it jumped right up on plane and was very responsive. I was very impressed with this engine during my testing.

[OxDoc]

Isn't there 4 engine choices?

[NautiqueJeff]

H7 can be either the XR-7 (550) or the XS-7 (550). Maybe that's what you're thinking of?

[OxDoc]

It is. What's the difference?

[vision]

Bling.

[nyryan2001]

$5k work of chrome exhaust headers and bling engine paint

[ironj32]

isn't the XS also completely closed cooled?

[Whitetail15]

i was told by dealer that only coastal engines will be closed cooled. The new H5 and H6 engines (355 hp and 450 hp) will only be all water cooled. No antifreeze options. Not like the 15's
(409 hp, 450hp) that are half and half. I think that will be be a drawback to anyone that has to winterize their motor. Only dealing with draining exhaust and tranny is a bonus. Plus heaters seem to last much longer with antifreeze than lake water, and you don't have to winterize them as well.

[ironj32]

I believe the XS is the costal 550 engine. I could be wrong though.

[vision]

i was told by dealer that only coastal engines will be closed cooled. The new H5 and H6 engines (355 hp and 450 hp) will only be all water cooled. No antifreeze options. Not like the 15's
(409 hp, 450hp) that are half and half. I think that will be be a drawback to anyone that has to winterize their motor. Only dealing with draining exhaust and tranny is a bonus. Plus heaters seem to last much longer with antifreeze than lake water, and you don't have to winterize them as well.

That would be a massive step backwards. I hope the information you were given proves to be inaccurate.

[Kenv]

OxDoc....for 15 there was 5 engine choices.....for 16.....four. 343 and 409 are gone....with the combined choice being the 355. Jeff' outlined the two 550 choices above, which some people did not know existed until they really started shopping for a new Nautique.