twin 140 zukes on a 23cc?

[Briguy]

4000rpm 24 knts 27.60 mph 9.5 gph 2.91 mpg
4500rpm 28.5knts 32.78 mph 11.0 gph 2.98 mpg
5000rpm 33 knts 37.95 mph 16.0 gph 2.37 mpg
5500rpm 36 knts 41.40 mph 19.5 gph 2.12 mpg
6000rpm 39 knts 44.85 mph 22.5 gph 1.99 mpg

http://www.classicseacraft.com/forum...rev=#Post45415

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To answer this thread I run 22" ss props on my twin 115 Suzuki 4 strokes and I get 28mph and 10.5gph at 4k rpm's for about 2.7MPG and that is with a full tank and 3 people. Max speed 38kts at 6300 rpm's. I may go to 24" props to drop the rpm's down to 5900 or so.
http://www.classicseacraft.com/forum...rev=#Post51742

I switched out my 22" props for 24" SS props on my twin 115's. The bow now runs a little flatter which I like but I lost a little trimability. My cruise speed is now about 2kts higher and top speed comes in at 39kts(hit 40 once) at 5900+rpm's. This is on a 23 CC with an enclosed transom and bracket. To answer this thread's initial question about the 140's since it is essentially the same block as the 115 (slightly bored out) and a higher gear ratio, my best guestimate is 2mph better at cruise and wot.

If I had to buy new motors I would go with the 300 Suzuki. From everything I have read, mpg would be in the mid 3 range and top speed about 44kts(50mph) A guy on THT just put a 300 on his 25 bluewater and is really getting great fuel numbers, even better than with the 250 Suzi.

Weight is an issue also, my 115's with ss props come in around 430 each vs. 630ish for the single 300. When I repower, I will go with a single 300. The 115's have been practically flawless. 45 miles offshore I never wonder "what if"

[Old'sCool]

I read the same 300 post on THT...very impressive!!

[Tsunami23]

I have a 1973 Tsunami (not a SeaCraft). I'm about three weeks away from having my new 300 Suzuki up and running. I'll let you know how she runs once I get her back from the engine shop. I'll be dropping it off next week.

[htillman]

I am very interested in your numbers, I am looking at one for my 23 Sceptre.

[EVERGREEN]

et23,
Keep an eye on EBAY this time of year. There are a lot of cheep 2-strokes available. Also, Suzuki 250 four-strokes that are being traded out for 300's.

Nice Suzuki 250 for $12,500.

http://cgi.ebay.com/ebaymotors/2006y...spagenameZWDVW

[Bigshrimpin]

Ed's is selling a brand new 30" Suzuki 250 for $12k right now.

[Bigshrimpin]

$8,000 - $10000 buys a LOT of fuel.

3mpg vs. 2.3mpg

Atlantis, Veatch, Hydrographer Canyons aren't out of range now


here's some stats of a 29ft oceanmaster powered by twin 2.0L mercs . . . You can find a set of these for 2 - 3K and they'll give you similar fuel economy to the Yamaha 130's.

[natchalkley]

I think Im going to probabaly go with the 300 zuke. I think that I should be able to get close to 3 mpg at 30 knot cruise and maybe upwards of 2.25-2.5 at about 40-42 knots. with the standard 100 gal plus ~40 in an external tank in the console I should have comfortable range for veatch/ west Atlantis etc to go load up on YFT and BET.

older engines really arent an option for me. while they may save me some $ in the short run, I CANT have my boat in the shop in the summertime. Not an options with comm bass and charters going. I gotta be able to pay for this thing somehow.

[76Savage]

Ran the twin 150 Yamaha 4 strokes this weekend.

Top End 49 mph
at 28 mph 2.7 mpg
at 38 mph 2.3 mpg

[Fr. Frank]

Deuce, was that WOT at "lightest" trim angle? Your pic shows an angle of trim than will keep more hull in the water. I ask 'cause I used to run a 23' CC SeaCraft with twin transom-mount 140 Evinrudes that made a WOT speed of 48 mph. It was the tow-boat for a marina where I worked, and had a T-top as well. I would think you would get more from those Yamadogs.