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Cat: Quad vs Twins

Old 10-31-2019, 12:32 PM
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Default Cat: Quad vs Twins

I am considering an engine package for a new Cat. I cannot make up my mind between quads and twins.
Please share with me your thoughts and opinions if you have had one or the other or both. Or if you have experience on Cat hulls with quads and twins.
It would be less HP with twins. Either 850 or 900 hp. vs 1200 hp. Maybe 7 or 8 mph difference top end?
Ive e narrowed it to:

Quad 300 V8 Mercs
Twin Merc 450s
Twin Yammy 425






Old 10-31-2019, 12:41 PM
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Kind of depends on the particular boat and size, but I've had two with twins and am now building a quad 300 merc 42 if that tells you anything.
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Old 10-31-2019, 12:57 PM
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Originally Posted by MakoMyDay View Post
Kind of depends on the particular boat and size......
That could be of interest to the topic, a 22 Twin Vee is a cat and runs great on twins.....or quad 50's

Old 10-31-2019, 01:01 PM
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Depends on size of boat, quads add more weight and expense that might not be worth it.
Old 10-31-2019, 01:07 PM
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Something else to keep in mind if you plan on running long distances. If you lose one motor on a twin setup it will be a slow ride home. It doesn't happen often but it is a benefit of quads over twins.
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Old 10-31-2019, 01:11 PM
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Long runs or relatively short runs to fishing ground? How do you load the boat? if often loaded down heavy then maybe quads, then theres the fact that Id much rather come in from 80miles on 3 engines than 1 engine.... basically if making long heavy loaded runs Id lean towards quads... but spending your money instead of mine is easy I guess haha
Old 10-31-2019, 01:30 PM
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This is probably as shallow a response as I have ever provided, but Quads look so much cooler while twins can look very pedestrian.
Old 10-31-2019, 01:31 PM
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Looking cool cost a lot of money, being cool cost even more!!!!
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Old 10-31-2019, 02:18 PM
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Depends on the boat, I try to select the best power for 90% use on the boat and the boats characteristics.. If you don't care about wide open speeds twins might be the way to go but if you want to cruise at 55 you might want quads. As said above quads might be nice when you loose a motor but you will have 50% more chance in loosing a motor with quads versus twins.
Old 10-31-2019, 02:20 PM
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Cats!
Old 10-31-2019, 03:39 PM
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My take is this:

Youre buying a boat that has the performance potential of the quad package. The only reason not to get quads is if the upfront expense or ongoing additional maintenance expense is beyond your budget. Otherwise, quad that bitch and get the full potential of the hull.
Old 10-31-2019, 03:41 PM
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Tough decision - At the risk of raising the ire of my good friend alloyboy (again) and as the number of sleepless nights (tossing and turning) is becoming the norm...sometimes...just sometimes...

a pair of 7's trumps four 6's or 8's...

noa...have you got the minerals...


https://www.youtube.com/watch?v=qcVH...ature=youtu.be
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Old 10-31-2019, 05:09 PM
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I'm getting ready to build a new cat (not requiring quads), but have been looking at different sizes and combos trying to figure out what I want to run. From my research and experience, quads come into play when you get to the 35' length or longer. I do know a guy that was running twin 350's on a 40' cat and went to quad 300's. The economy went up .3-.4 mpg with the quad 300's and the top end went up about 4-5 mph. I know that doesn't help as much since your looking at twin 425's. Personally, I prefer naturally aspirated, so the 450's are out in my book. With the extra weight, drag and cost of quads, I would probably go with twins....but I'm not a WOT person, I shoot for the most economical, comfortable cruise that gives me decent speed. However, I can see the appeal of quads to a tournament guy that wants to go balls out all the time and be able to get home as quickly as possible if one engine goes down.
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Old 10-31-2019, 05:43 PM
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Originally Posted by Drew46 View Post
This is probably as shallow a response as I have ever provided, but Quads look so much cooler while twins can look very pedestrian.
your a 99%er. If you are talking possibility of quads its got to be 35+ feet so yeah, be cool.
Old 10-31-2019, 07:16 PM
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As most are pushing for quads Ill throw in my opinion.

Twins are my choice. Less potential for things to go wrong with less equipment. This opinion comes from flying planes with 4 and 2 engines. More engines more chances for things to go wrong. This is why most airliners are now twin engine.
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Old 10-31-2019, 07:23 PM
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If it’s big enough to fit quads, it needs quads and you want quads.
Old 10-31-2019, 07:42 PM
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Originally Posted by MakoMyDay View Post
Kind of depends on the particular boat and size, but I've had two with twins and am now building a quad 300 merc 42 if that tells you anything.
that tells me a lot. especially coming from you. Super helpful!
it the 35 Inv Cat
Old 10-31-2019, 07:43 PM
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Originally Posted by frank1861 View Post
Something else to keep in mind if you plan on running long distances. If you lose one motor on a twin setup it will be a slow ride home. It doesn't happen often but it is a benefit of quads over twins.
yup. This is very true. 3 is better then 1
Old 10-31-2019, 07:49 PM
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Originally Posted by ucf_motorcycle View Post
As most are pushing for quads Ill throw in my opinion.

Twins are my choice. Less potential for things to go wrong with less equipment. This opinion comes from flying planes with 4 and 2 engines. More engines more chances for things to go wrong. This is why most airliners are now twin engine.
This is a most interesting response. You'd think 3 engines are better then 1 on a plane.
Old 10-31-2019, 07:53 PM
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thanks for the feed back guys. its helped me decide.
Quad Merc 300
74 mph.
of course top speed ain't all that but i want to cruise at 45-50, maybe 55
fishing grounds are 80-120 miles round trip
looking at 35' Inv Cat

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