300 HPDI on a 23' CC

[bgreene]

Originally Posted by Abe's Rocket

I can cruise at about 9gph with a my 250 etec.

WOT i'm burning 23gph and hitting around 44-to-45mph. I'm surprised that a 300hp etc doesn't go right past 50mph.

I was just thinking that too.......... A Zuki 300, new Yami 300, etec 300..........I'd be disappointed if I rigged one on a 23' Seacraft and didn't get low-mid 50's WOT trimmed and prop'd right. Might as well stick with a 200/225 if that's the case for a lot less money.

[Bigshrimpin]

Propped to hit max rpm 300 hpdi on a 247 Grady voyager is 4000rpm 14gph

[Bigshrimpin]

Originally Posted by Bigshrimpin

Propped to hit max rpm 300 hpdi on a 247 Grady voyager is 4000rpm 14gph

one thing I can say is that running 12 - 14mph 2500 - 3000rpm in heavy seas . . . you burn a ton of fuel like 1mpg.

Here's some performance bulletins.

http://www.yamahaoutboards.com/sites...c-z300turd.pdf

http://www.yamahaoutboards.com/sites...5-z300txrc.pdf

[Rlbol]

If you fish much as in trolling, the 300 doesn't like it! Has issues with fowling plugs. A lot of the fishing guys got rid of them for this reason but you can pick them up pretty cheap and there are a lot of them! The new 300 is amazing though. That would be the ideal engine for a 23 I believe. Lighter weight, get fuel burn, lots of power and great gadgets! I have an ox66 250 on my 23 and am happy with it. I don't have much for fuel burn numbers but once I get the new bracket I will install the fuel management gauge. I have an extra 25" ox66 250 if you just want to get your boat powered again shine.

[shine]

I am passing on the 300 HPDI. Made spreadsheet to analyze long term costs (operating and maintenance). If I put at least 150 hours a year (I was at 150 in 6 month on the old motor) then the cost to operate the HPDI is about the same as a F250. Cost of 90 octane non-ethenol fuel, and higher fuel burn for idel/troll were the two big factors.

For a used engine, I think an F250 is the way to go. Now if I decide to go new, then a 300 Suzuki looks to be the best deal all around.

Thank you everyone for posting your numbers

[Old'sCool]

Originally Posted by Rlbol

If you fish much as in trolling, the 300 doesn't like it! Has issues with fowling plugs. A lot of the fishing guys got rid of them for this reason but you can pick them up pretty cheap and there are a lot of them! The new 300 is amazing though. That would be the ideal engine for a 23 I believe. Lighter weight, get fuel burn, lots of power and great gadgets! I have an ox66 250 on my 23 and am happy with it. I don't have much for fuel burn numbers but once I get the new bracket I will install the fuel management gauge. I have an extra 25" ox66 250 if you just want to get your boat powered again shine.

I have a 2000 OX66 250. Originally on Armstrong bracket and 25" shaft but now on Hermco and added the Bay 5" kit so 30" shaft. With 4 blade Solas 17P, 140 NM round trip ocean 1.8mpg was the last trip. That was mostly 1-2' so the hammer was down pretty good. There's a trade off between the 3 and 4 blade. The 19p 3 blade gets a little better mileage and more speed, but won't plane as slow. This is my 3rd OX66 motor and although they LOVE gas and oil, they continue to run and I can usually work on it if needed.

Just a comment: The F250 Yam is heavier. It (and the new Yams) are belt drive camshafts. The Suzuki is oil bath chain drive. Pick your poison I guess. Last yeat I would have chosen the Suzi motor for sure. Since the new Yams are lighter I would probably go with the best price/warranty, etc. now.

[shine]

I have priced both (SUZUKI 300 and Yamaha 300) and new Yamaha 300 is about 3k more (my local Yamaha dealer gives no breaks .

The Suzuki has better warranty. Im also a little more inclined to go with the older motor design (suzuki). I do like the lower weight of the Yamaha, sure would be nice.

We will see

I have an extra 25" ox66 250 if you just want to get your boat powered again shine.

Thanks, I have thought about going that route. I have seen some very nice ox66 go for $4k-$5k, and low hours F250 goes for around $10k. More to ponder.

[htillman]

Getting ready to put a 300 4S Yamaha on a CC 23' Seacraft

[shine]

Getting ready to put a 300 4S Yamaha on a CC 23' Seacraft

please post some numbers as soon as you can !!!

[sinan]

I have a 2004 300 HPDI on my Seacraft 23, I get 13 gph at 3900 rpms for a crusing speed of ~24 knots. Above 4200 rpms speed will go up to 27 knots or so but gas mileage gets expensive, about 17 or 18, spark plugs are a massive deal, i change them about every 75 hours or so, PM me if you need more info