300 HPDI on a 23' CC
 

I searched and found a couple examples, but no performance figures. Looking for some numbers PLEASE. I am considering one of these motors for my boat.

Its a 2007 300 HPDI, BTW. I am familiar with the early model problems and the necessary updates. Will have a mechanic go through motor before purchasing ;)

I know fuel burn would be A LOT more at trolling and idle, not to mention sound level (vs my old F225), but from what I can tell off other boats the cruise burn will be maybe 12 gph at 33+ mph, my best F225 was somewhere around 8 gph at 26-27 mph. I dont mind burning 30% more fuel to go 25% faster. :D

Also looking at a new 300 Suzuki, but dropping $20k on a motor is not somethign Im excited about unless I decide to keep this boat for a long, long time.

Any info is appreciated.

Definitely intriguing depending on the price.

I'm probably wrong, but i think that engine comes close to 800 pounds. My F250 4 stroke weighs 608 Dry.

The boat can surely handle the HP but at what cost? One things for sure, she will probably move pretty good with that 300. I've touched 47 in mine with the 250.

300hpdi is listed at 539lbs . . . it's lighter than the F225/250 but a bit. I've mounted both on boats with the yankee hoist and the 300hpdi seems significantly lighter than the F225/250. The 800+lb yamaha is the F350.

its actually a hair lighter than my old F225

That being said - personally i'd be stoked to be dropping that powerplant on the back.

Hey guys...I'm new on here..Good info. My uncle has a 1998 23cc and just had a new E-tec 300 30" installed on her and said he's getting top end around 49mph. Not sure of fuel burn. I'm doing my research now for engines. I'm about to start the restoration on my 1974 Potter 23CC and looking at 350 verado, 300 verado, 300 optimax. Raising transom to 30" I have read a lot of great post on here. Both boats are from south Jersey. Good luck!

My math says 50% more fuel for 22-25% faster. 8GPH x 150% is 12 GPH. So it isn't quite without a penalty. But not terrible.

8 GPH cruise on a 23' is exceptional, regardless of speed, when using an outboard. Very hard to achieve that even with a new 4 stroke. I would venture to say that average fuel usage at cruising speed is closer to 10-12 GPH for most 23' rigs (like mine) and should be used for comparison purposes...

I know, and really lightly loaded and barely on plane I could get lower than that ! That F225 was a great motor for a LIGHT 23'

etec 250
 

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.

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

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 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

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.

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 :rolleyes:

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.

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

:)

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

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

those are close to the speeds I was getting with the F225. I think your 300 should be getting better numbers; could be the prop or engine height. Either that or your boat is super heavy :o

I was about 22 knots at 4000 RPM with the F225, which is barely really a 225 hp motor.

I have a rebuilt 2005 300 on a bracket on my 23. Picked the boat up in June . I do not know exact burn rates but I do see 35 mph on the gps at 4000 rpm . Will get real close to 50 at wot. This power seems to be about perfect for this hull .its a 85 model by the way.

thats helpful, and pretty good

how about inexact burn rate :)

Me too - might want to look at:
1. the boat - is it water logged and therefore much heavier than spec
2. is the engine too low
3. is it prop'd right, getting max rpm, and trimmed out when testing full speed WOT

Would think it should run the boat to at least 55 mph.

I'd personally look into getting a Suzuki 300 for that boat. You can find good deals out there if you were willing to purchase used also. My buddy picked up a 2009 Suzuki 300 with hardly no hours on it and still under warranty for under $9k for his 25' Contender. Motor was practically brand new and runs like a champ!!!

Shine, if money were not an issue I would think about a f 350. I believe they are lighter then the older f 300's.
As for burn rates for my 300 hpdi. I would guess in the 2 mph range. The little bars don't help much and I just put more gas in when it gets low.
I am only getting about 5500 rpm's at wot. I haven't looked up what is ideal but think I could do a little better. Will probaly call ken at prop gods next spring and do some fiddling. Think I can improve cruise and top end a bit.
Chip

Im going to have to disagree on the Yamaha F350. That engine is entirely too heavy for the 23' Seacraft. Not saying that you couldnt put one on it, but I think its going to be too heavily weighted in the back. The best single engine for this boat is the Yamaha F300. It is actually the lightest engine of its size out there right now. My friend has a Mercury Verado 350 SCI on his 23' Seacraft right now, and he said the engine is too heavy for it weighing in at 667 lbs and he is using a double floatation Armstrong bracket for it. Says the boat needs lot of trim tab to keep the bow down. He said if he were to do it all over again he would go with the Yamaha F300 any day.

Here are the comparison specs.

Mercury 350 SCI ..... 667 lbs
Mercury 300 Pro ..... 20" ... 635 lbs (website notated lightest model, so Im assuming the 20" shaft)
Mercury Verado 300 ..... 20"...635 lbs (website notated lightest model, so Im assuming the 20" shaft)
Yamaha F350..... 25".. 804 lbs......30".. 822 lbs
Yamaha F300..... 25".. 562 lbs......30".. 571 lbs
Suzuki 300 ...... 25".. 604 lbs ..... 30" .. 615 lbs.

http://i141.photobucket.com/albums/r73/PharmD2B30/6.jpg

Correct....you don't want the Yami 350 hp which is a V-8, it's a heavy ass motor that's in love with gas.

Don't forget about the 300 E-Tec! It's actually the lightest at 528/534 lbs for 25"/30" versions!

Ahhh..... Yea, I always seem to forget about the E-Tecs.....great motors there too!!

I want your boys boat! That is so bad arse!!!!! I agree with the power discussion as well, that 300 Yammy is awesome!