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Elvira266

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Posts: 29
Reply with quote  #1 
I hope this is the correct forum for this question.

I currently have G1 200 H.O.'s on my World Cat. I am in the process of making a decision on a repower. The G1's are a little bit heavy on my transom but being a cuddy/walk around it's probably not a bad thing where it is heavy in the front as well. 

So here are my questions. ( I have already decided against the iDock )

Is there a big weight difference Between the small block and big block.

Is there a huge difference in economy and will the torque I lose going to a SB be regretted in your opinions ?
PropNut

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Posts: 467
Reply with quote  #2 
Not a big difference in weight, actually they are really close when you compare similar models.  The SB is available in a TRAK midsection that saves about 40lbs each.

The fuel economy difference is going to be about 2 gallons per hour, the SB burns about 15GPH and the BB burns about 17GPH at 5500rpms.

Good thing you decided against iDock, even though i am generally a big fan of it.  Most catamarans it is recommended to swap the standard and counter rotation motors on the back of the boat, right now this is NOT and approved iDock configuration.  
Elvira266

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Posts: 29
Reply with quote  #3 
QUOTE=PropNut]
Thanks for the reply. When you say compare similar models do you mean G1 vs G2 or SB vs BB ?

If i understand you correctly Buying the BB vs the SB is a no brainer all the way around?
PropNut

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Posts: 467
Reply with quote  #4 
I mean if the weight of units with the same steering options and shaft lengths.

For the most part i would agree, the SB is slightly more economical in both purchase price and efficiency and offers more configuration options.  If weight is the primary concern being able to buy the stripped down version which is not available in the BB is also a good case for the SB.

I also for most cases like the gear ratio of the BB better, the gear ratio on the SB is great for pontoons but can sometimes make it difficult on boats that have some speed.
Elvira266

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Posts: 29
Reply with quote  #5 
I was actually thinking that it was a no brainer to get the BB's seeing there isnt a huge weight difference between them. 4 GPH diff at 5500 RPM probably won't equate to much when cruising at 3500 or am i wrong?
rickmcd53

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Posts: 2,495
Reply with quote  #6 
Propnut may have to reply on cruising fuel consumption.
If you are looking at buying in the spring promotion the 200 hp 2.7L has $1000 discount per engine and the 200 HO 3.4L has $2000 off per engine.
Elvira266

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Posts: 29
Reply with quote  #7 
I've already got plans to drop my boat for the repower Tuesday evening with plans to have the BB's installed. I'm just questioning whether or not the SB's are worth the savings vs the BB'S.
PropNut

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Posts: 467
Reply with quote  #8 
According to the performance reports i can find the SB burns about 5.5-6 gph @3500 rpms where the BB is about 7 gph
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