how much power do I needed?
 

hello
I recently purchased a '76 20'seacraft and it has an old 200hp evinrude. I was wondering if a 150hp yamaha would be enough for this boat w/ some load? Mods are already starting!

thanx! http://img.photobucket.com/albums/v4...Picture213.jpg

Re: how much power do I needed?
 

Fishtale, My 20' sefari had a 135 merc on the back and that was plenty of power. A 150 should be just fine power wise but without getting into the whole transom rebuild thing. My opinion is that most of the sea crafters here enjoy thier boats for fishing rather than racing. Just my .02

Re: how much power do I needed?
 

Catman, purchased my '79 20 w/200 Blackmax. Seatrialed beautifully in Tampa. Towed to H.H.I. and blew 100 feet from the dock! What a surprise! A brand new head gasket! Three years later, after a very expensive rebuild that never ran right, I repowered w/'99 John. 175.. Carburated and dependable. Not sure of topend, but sufficiently strong throughout all ranges. Only about 90 hours on it today and not sure of fuel economy. Don't fish it like I used to, either. Usually a crew of four, large cooler of adult beverages, and seems the longer the day, the average speeds consistently grow. Not sure how I'd repower today, but I'm very happy with what I did back then. Hope this helps. Vezo.

Re: how much power do I needed?
 

My 1978 Master Angler originally had a very tired 1979 Evinrude 150, it ran about 35-38 mph. I am rebuilding the transom and have a 2001 Merc 200 EFI almost ready to go.

I think anything from a 135 to a 150 would be fine on a older 20" transom. If you want to rebuild the transom and raise it to 25" and maybe go with a bracket then you could probably go with the heavier(more HP and/or 4-stroke)motors.

Re: how much power do I needed?
 

What is the ball park top end speed for a 20ft SC with a Mercury 200 hp engine.

Re: how much power do I need?
 

thankx for all your responses it helps alot. My transom was rebuilt and raised to 25" according to the previous owner, but I think i'm going to repower it with a 1996'-98' yamaha 150 efi if ppossible. This old 200 evinrude goes thru gas like water so I think I'll be better off with a 150 EFI or maybe if I can dish-out $7500 I'll go with a DF140 hp Suzuki!

Re: how much power do I needed?
 

Count the number of "NO-SEE-UM's" that slammed between your teeth/divided by tear drops X number of times your ears flapped against the side of your skull in 5 mins at WOThttp://www.click-smilies.de/sammlung...l/Fool/leb.gif

Re: how much power do I needed?
 

You need about 115 horsepower. A 135 or 150 V6 won't go real fast, but the motor won't strain as hard.
On the other hand, there's the old theory that you should put enough HP on your boat to scare your wife into staying home while you go fishing with the guys. If that's where you are, then a 225 would be about right. Figure somewhere around 60 mph with a 2 stroke Optimax or HPDI.
I have even seen a SeaVette with old T-275 Jag block Mercs up in OC, MD. (One of the lower units was blown out)
But then, where would you go to need that kind of speed.? [img]/images/graemlins/cool.gif[/img]

Re: how much power do I needed?
 

I have a 23 that had twin 235s on it and while I never ran it with those engines I'm confident it would have gone fast on 110 gals but not far [img]/images/graemlins/blush.gif[/img]

Re: how much power do I needed?
 

Wan'na Reason fo'Mo speed !
The boat juz' at the spout is juz' a lil UNDER POWERED ! Bet He wished He bought those Quad 300's instead of the 115 His wife said He could have !!
http://www.frenzie.com/waterspout_Tang.jpg
Gotta 150 Merc. Carb on My 20' Master angler . I'll go back to at least a 175 next time(200 Mariner when purchased),Lost some speed When I Added Xtra glass to the Girl.Juz' like it When I Need it ,down Here!
Scream'n Reels' [img]/images/graemlins/smile.gif[/img]

Re: how much power do I need?
 

thankx for answering my post, so you think it would be better to get another 175hp-200hp as oppose to the 150? What was your fuel consumption like with the 150 merc? And if I purchased another engine it would be an EFI.

Re: how much power do I need?
 

Fishtale,
I just checked the yamaha website and the 200 hp is only 27 more pounds than the 150 (453lbs to 426lbs). This is for the 2005 engines. If you go to their website and click the performance bulletins they give a good preformance review of most of their motors tested on a whole bunch of different boats, no seacrafts but some comparable sized boats. I'm in the same boat as you (literally) except I have no motor now. I'm thinking early next year I will be looking to purchase a new one. I'm going either with the yamaha (2-stroker) 150 or 200. If the price difference isn't that great then it will probably be the 200. Good luck -Will

fishtale, I also sent you a p.m.

Re: how much power do I need?
 

I like the 150 There almost Bullet proof.Same block as the 200 Just not bored out which gives You more Steel to bang on.I thought the 150 actually weighed more than the 200? If I had My Druthers a 200 would go back & prob. a Carb'd. Just old in thought ,I know what I'm looking at under the cowling.Butttt then the 4 stroke are sounding good too.
Scream'n reels' [img]/images/graemlins/smile.gif[/img]

Re: how much power do I need?
 

I'm undecided about which to buy - the old fashoned carburetor motors or the newer EFI. I'm definately going to buy one of the two due to much less $$$ opposed to a HPDI or 4stroke. I've heard that the EFI is not much more fuel efficient and a whole lot more expensive to work on. Can anybody chime in on the efficiency differences between a carburetor motor and an EFI on a 150 or 200.

Re: how much power do I need?
 

I agree with you Will, When Mercury has their re-power special at the end of the year I'm getting the Merc 225 saltwater classic. I should come in around 10k ( I hope )

Re: how much power do I need?
 

Another option.........I bought my 2003 225 Mercury EFI 25" shaft for my 23 CC last September from Eckerd College in St. Pete. They buy new engines every year and sell the year old used ones to the public. I paid $7600 for mine with 502 hours.

There may be a college in your area with a "Marine" depatment that does the same.

One thing NOT to do with the Mercury.....run with a low or bad battery!! Screws up the computer big time.

Seeya

Re: how much power do I need?
 

fishtale,

I'm running an '02 carbed Merc. 150 on my 1985 20' Grady CC, which I believe is a few hundred pounds heavier than the 20' SeaCraft. Especially, since she's not so dry anymore. [img]/images/graemlins/smirk.gif[/img] At 3600, I'm burning 6.5 gal/hr and making about 24 mph. At 4000, I'm burning 7.5 gal/hr and making about 28 mph. She spins up to 5400 in the summer and gives me just about 40 mph. Can't tell you what I burn at WOT cause I never look at the Navman then.

Every once in a while, I wish I had more power, but there aren't many opportunities when I'd actually get to use it.

The carbed Merc. 150 is a great little motor. [img]/images/graemlins/smile.gif[/img]

Re: how much power do I need?
 

I run an 88spl on my 19 BR which is the same boat just measured from a differant place. I get a 30mph cruise out her with two guys and loaded for fishing. I have a hard top with enclosure and outriggers. My outboard guy told me 75% 100% of the time is the best for an outboard so with the 88 75% is my cruise and I can run it in allmost every sea and not pound the boat and I'm not getting in everyones way either. As the picture shows she's fast enought to bend the antennas http://images.andale.com/f2/115/106/...6_SheilaB1.jpg

Re: how much power do I need?
 

Don,

Your boat looks great! [img]/images/graemlins/grin.gif[/img]

Re: how much power do I need?
 

Thanks Pat ..I hope to have her there on the 11th...

Re: how much power do I need?
 

Don- That's a beautiful boat! What is a 19' BR?

Steve

Re: how much power do I need?
 

OK- 19' Bowrider. Sorry, I'm new to the site, and Seacrafts. Just saw the profile on Captmin's 1967 19 Bowrider, looks like a beutiful, practical boat. How rare are they? I'm currently considering a 20' CC project boat, but a 19' would actually work out better for me.

Steve

Re: how much power do I need?
 

They are rare but not that rare if it makes any sence. I haven't seen any others up here in New Jersey but I've seen a few in Fla. Think there may be one for sale on this board and there are at least 3 other guys who have them on this board. The 19 is the 20 if I'm not mistaken it's just measured at a differant place (loa verses low"). The boat runs great with a 88 spl but I've seen a 175 on one. It's a great all around boat good for fishing and fun with the kids. She is a wet boat so trim tabs make a big difference.

Re: how much power do I need?
 

Don,
Yours looks like a little Rybovich with that white accent! Was that original?

There is a really nice BR with a newer outboard on a bracket on I think the third page of the for sale listings.

I just found a nice Seafari, but I still think the BR is the coolest looking 20 footer.

Checked out your website- nice stuff! I may be giving you a call at some point for a radar arch or small hardtop.

Steve

Re: how much power do I need?
 

That accent stripe idea I took from an Aristocraft of the same vintage. I think it looks cool, makes it look like it has a differant shear line the what it really has. Take a ride down on the 18th of Sept and see the boat in person. We'll be at the Flying Cloud Bar just opposite of Trump Marina in Atlantic City along with a few other CSC guys..1:00pm till ?
http://images.andale.com/f2/115/106/...02_SheilaB.jpg

Re: how much power do I needed?
 

150 Yamaha will work just fine on your boat. My friend Al has one on his 20 c/c and it performs well, and is great on fuel. If you have any problems with performance just play with the prop pitch, and you will be happy. Good luck, Sanzo