200 hpdi on a 18

akimbrel · #1 03-28-2005, 08:33 PM

Anybody have a 200 hpdi on a 18. It weights 466 so should not have problems with scuppers. Anybody have any thoughts?

Ntrain2k · #2 03-28-2005, 08:52 PM

Quote:

Anybody have a 200 hpdi on a 18. It weights 466 so should not have problems with scuppers. Anybody have any thoughts?

It should definatly fly...

sailcat · #3 03-28-2005, 08:55 PM

I have a 200 on a 20', and it works for me!!

SEAFARI · #4 03-28-2005, 11:25 PM

Way over powered, a 115 or 130 yam 358lbs would
be a good choice. The potter years were rated for
150 max.

Mark · #5 03-28-2005, 11:37 PM

Quote:

It weights 466 so should not have problems with scuppers.

That's a joke right?! I have owned the 18' with a 375# engine on it and it was borderline at best. 466#s? - buy some good life vests.

Ryan · #6 03-29-2005, 12:20 PM

Do you have a 20 or 25 inch transom? because if its 20 inches your gonna be too low in the water with that weight. But I sure would love a ride on that rocket ship [img]/images/graemlins/cool.gif[/img]

akimbrel · #7 03-29-2005, 05:13 PM

I Have a 25in. So i am think it should be fine. The 200 Hpdi weights less than a 150 Hpdi so why not go with more power.

Mark · #8 03-29-2005, 06:13 PM

If you've raised the stringers/floor, you may be able to pull it off. However, if the floor is at the original height, whoever told you that 466#s on the transom would be fine with the scuppers grossly mislead you. The 200hp isn't the sticking point here, it's the notion of the four hundred and sixty six pounds. If you want lots of ponies back there, get a lighter 200hp. Those old Mercury's were pretty light...

I currently have a 416# engine on a SeaCraft 20' that the floor was raised 2.5" in and I wouldn't want that floor even 1/4" lower with that weight back there.

Either raise the floor or look for the lightest engine you can find. I'm not saying this because I have anything against the engine you are considering, I just know from past experience with my SC18' that 466# is simply too much weight if the boat is in the original configuration. I didn't raise the floor in my 20' because I had extra coinage rattling around, they NEED it with heavy engines....and my engine is 50# lighter than what you are proposing.

Go to a dive shop and rent 466# of lead weights (really, give it a try). Now, park that boat next to your dock and load that weight right next to the transom and see how your scuppers are doing.

akimbrel · #9 03-29-2005, 06:22 PM

Would that weight be ok if i put a floation bracket on the boat. If so what is a good one to buy. My other option is a yamaha f115 but i am worried about speed and getting on plan.

Ryan · #10 03-29-2005, 06:55 PM

Ark I wouldnt tell you to put a bracket on an 18,and Mark's advice is good about a weight test. I have seen them with 115 to 200 but I think a 175 is perfect for the 18. On the other hand the 115 will get you where you need to go but not as fast