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Suzuki 350 vs Merc 300 V8

Old 06-23-2020, 06:37 PM
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Question Suzuki 350 vs Merc 300 V8

I know there is not a big difference between the Merc 300V8 vs the 350/400 verado except in WOT. What about the V8 vs a suzuki 350 with the dual props? This is for a 34CC.

any thoughts? Thanks.
Old 06-23-2020, 07:36 PM
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Originally Posted by HavanaCowboy View Post
I know there is not a big difference between the Merc 300V8 vs the 350/400 verado except in WOT. What about the V8 vs a suzuki 350 with the dual props? This is for a 34CC.

any thoughts? Thanks.
Whats the weight of the boat and trips or twins?
Old 06-23-2020, 07:54 PM
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Originally Posted by Castawaychris View Post
Whats the weight of the boat and trips or twins?
14000 fully loaded ready to fish. With twins.
Old 06-23-2020, 07:57 PM
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Originally Posted by HavanaCowboy View Post
14000 fully loaded ready to fish. With twins.
350 zuke all day. Im building a project boat thats a bit heavier than yours. I got a smoking deal on v350. Its a cat so 2 or 4 is my options. I think 2 will do it but realistically the zukes is what I should havr bought.
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Old 06-23-2020, 08:10 PM
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Originally Posted by Castawaychris View Post
350 zuke all day. Im building a project boat thats a bit heavier than yours. I got a smoking deal on v350. Its a cat so 2 or 4 is my options. I think 2 will do it but realistically the zukes is what I should havr bought.
Thanks. They should have more torque with those dual props im thinking (out of hole power). I really like the look also. I wonder how the higher compression will handle long term. I was pretty set on the 300 merc but then a buddy of mine told me to look at the suzuki and I was impressed.
Old 06-23-2020, 08:12 PM
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Originally Posted by HavanaCowboy View Post
Thanks. They should have more torque with those dual props im thinking (out of hole power). I really like the look also. I wonder how the higher compression will handle long term. I was pretty set on the 300 merc but then a buddy of mine told me to look at the suzuki and I was impressed.
I've not ridden on a boat with them but holeshot and mid range torque and efficiency is where they seem to shine.
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Old 06-23-2020, 08:20 PM
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I would go American made all day, but I definitely see the perks of the duo prop in your application as you wonít be breaking any speed record with twins. I personally canít see how the duo prop can be very efficient at speed, but I am not marine engineer. I imagine it will help you get up on a plane but after that from what I have read top end is definitely not where the zuk shines. If they are the same price I would seriously consider mercury, but I am not the most knowledgeable person on this forum. Boat make would help.
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Old 06-23-2020, 08:23 PM
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Originally Posted by eli6579 View Post
I would go American made all day, but I definitely see the perks of the duo prop in your application as you wonít be breaking any speed record with twins. I personally canít see how the duo prop can be very efficient at speed, but I am not marine engineer. I imagine it will help you get up on a plane but after that from what I have read top end is definitely not where the zuk shines. If they are the same price I would seriously consider mercury, but I am not the most knowledgeable person on this forum. Boat make would help.
Reef runner 34
Old 06-23-2020, 08:29 PM
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Originally Posted by eli6579 View Post
I would go American made all day, but I definitely see the perks of the duo prop in your application as you wonít be breaking any speed record with twins. I personally canít see how the duo prop can be very efficient at speed, but I am not marine engineer. I imagine it will help you get up on a plane but after that from what I have read top end is definitely not where the zuk shines. If they are the same price I would seriously consider mercury, but I am not the most knowledgeable person on this forum. Boat make would help.
I'm too lazy to look it up but pretty sure the zuke was right there with the yam 350 v8. Those motors have their problems but lack of power isn't one of them. OP do some search on this forum and you will get a lot of info.
. The mercs are great motors but im pretty sure on a 14k boat the zukes gonna win.
Old 06-23-2020, 08:36 PM
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Originally Posted by Castawaychris View Post
I'm too lazy to look it up but pretty sure the zuke was right there with the yam 350 v8. Those motors have their problems but lack of power isn't one of them. OP do some search on this forum and you will get a lot of info.
. The mercs are great motors but im pretty sure on a 14k boat the zukes gonna win.
Yea after reading some specs on the reef runner I donít think the 300v8s in a twin config would work very well. I assume Trips are off the table? Max hp is 1350 for that hull. I would be between yam 350s and zuk 350s if I were sticking to twins.
Old 06-23-2020, 10:13 PM
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A buddy pushes 20,500# of aluminum catamaran up to 43 mph at 5,800 rpms with twin Zuke 350s. The grip is awesome. But, one blew at 188 hours. Better make sure you have at least 89 octane.
Old 06-24-2020, 03:54 AM
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Do your due diligence and talk to several different owners of the Suzuki 350s. There are a lot of them out there that haven’t even made it to 500 hours without some serious problems. There’s nothing they will do extraordinarily better than the Mercurys besides maybe a few (1-3mph) ticks on top end. Mercury’s warranty is light-years ahead of Suzuki’s. Stick with the brand that provides the best local service to you. As wdlfbio mentioned, make sure you have access to good fuel if you go with Suzuki as they are not a fan of 87 octane. The Mercury V8 was designed to run on 87 octane fuel.
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Old 06-24-2020, 04:39 AM
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I repowered a Venture 34 with the new Mercury V8 300, and the incredible differential in power/weight ratio is one of the primary contributors to overall mid-range performance, up probably between 30-35 percent over the Yamaha 250 V6 they replaced, and at a lighter weight. I'd certainly compare power/weight ratio with that Suzuki 350 also. In my case, running a pre-four stroke design boat, being able to go back to an engine weight that even for back then would be extremely light, putting out this much torque, has been a real game changer. It seems more and more that Mercury has really elevated the bar.
Old 06-24-2020, 07:16 AM
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No disrespect but why would you put twins on? At 1350hp rating seems like triple Merc 300s would be a great set-up. You’re not pushing a barge.
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Old 06-24-2020, 07:50 AM
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Originally Posted by plumsal View Post
No disrespect but why would you put twins on? At 1350hp rating seems like triple Merc 300s would be a great set-up. Youíre not pushing a barge.
I was thinking the Same Thing. Duals even 700hp, would be upsetting.

Suzuki's Duo Prop is exactly for this purpose. Big Heavy Off Shore Boats.

Last edited by InCogKneeToe; 06-24-2020 at 08:07 AM.
Old 06-24-2020, 09:43 AM
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Originally Posted by plumsal View Post
No disrespect but why would you put twins on? At 1350hp rating seems like triple Merc 300s would be a great set-up. Youíre not pushing a barge.
Are we sure the boat is rated for 1350 hp? Thatís a ton of power on a 34í boat. I do agree with the crowd tho. Twin Mercs, or trips if you can swing it or want the extra speed. Probably 48 to 50 top end with twins?
Old 06-24-2020, 01:28 PM
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Originally Posted by plumsal View Post
No disrespect but why would you put twins on? At 1350hp rating seems like triple Merc 300s would be a great set-up. Youíre not pushing a barge.
Im in the florida keys and there are areas where im at that at low tide gets to 3 feet. I dont want to risk that lower middle engine. I plan on rigging twins and spreading them a little further appart like to use joystick and im hoping this will be enough to not hit bottom. Some other boats around me did this and thus far they are ok.
Old 06-24-2020, 01:33 PM
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Originally Posted by Flymost1 View Post
Are we sure the boat is rated for 1350 hp? Thatís a ton of power on a 34í boat. I do agree with the crowd tho. Twin Mercs, or trips if you can swing it or want the extra speed. Probably 48 to 50 top end with twins?
I would love trips but not sure the water depth in my area for about 700 yards is shallow til i get to deeper water (3ft low tide sometimes little less) will handle that lower middle outboard.
Old 06-24-2020, 01:36 PM
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Originally Posted by abacodan View Post
I repowered a Venture 34 with the new Mercury V8 300, and the incredible differential in power/weight ratio is one of the primary contributors to overall mid-range performance, up probably between 30-35 percent over the Yamaha 250 V6 they replaced, and at a lighter weight. I'd certainly compare power/weight ratio with that Suzuki 350 also. In my case, running a pre-four stroke design boat, being able to go back to an engine weight that even for back then would be extremely light, putting out this much torque, has been a real game changer. It seems more and more that Mercury has really elevated the bar.
Interesting. What is the weight of your Venture ready to fish? And what is top end speed WOT? Thanks in advance.
Old 06-24-2020, 01:39 PM
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Originally Posted by davidwademarine View Post
Do your due diligence and talk to several different owners of the Suzuki 350s. There are a lot of them out there that havenít even made it to 500 hours without some serious problems. Thereís nothing they will do extraordinarily better than the Mercurys besides maybe a few (1-3mph) ticks on top end. Mercuryís warranty is light-years ahead of Suzukiís. Stick with the brand that provides the best local service to you. As wdlfbio mentioned, make sure you have access to good fuel if you go with Suzuki as they are not a fan of 87 octane. The Mercury V8 was designed to run on 87 octane fuel.
That is exactly what I have been reading. I guess that is due to the higher compression? Since last night I have read of a few issues some owners have had with the 350s. thank you for the input!!!

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