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#11
11-07-2012, 11:07 AM
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Quote:
For a comparison the inline 150 merc's Egg's mentioned were 275lbs that were originally rigged with the 20MA. The Merc 175 didn't come out until 1978 and that was only 350lbs. 1981 225 Merc was only 360lbs. Last edited by Bigshrimpin; 11-07-2012 at 11:26 AM. 
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#12
11-07-2012, 01:22 PM
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Quote:
As others have said, many of these boats were sold new with relatively small (but lightweight!) motors, because the SeaCraft VDH is more efficient than any comparable deep V so it doesn't NEED as much power. The problem with the 130 Honda is it's weight! Those older Hondas were even heavier than the new 150 4-strokes, which I think are about 490 lbs (wet, with oil), so boat balance (CG location) is the real issue! When you consider that Carl Moesly designed the 19/20' hulls in the mid-60's for the I-6 Merc that weighed about 275 lbs, increasing engine weight by 2X is going to seriously upset the boat's balance! Even if that motor put out 200 horsepower, 500+ lbs on the transom will prevent you from planing below about 20 kts! When it gets rough, you won't be able to use 200 hp, and you'll wish you had a much lighter motor that would let you plane at 10-12 mph! I'm speaking from experience because I ran my boat for over 30 years with a 300 lb 1975 Evinrude 115 that actually put out about 100 hp at the prop (motors were rated at the powerhead instead of the prop back then). It would cruise at 20 kts with a top end of about 32 kts, but it would easily plane at about 10 kts, even with a very heavy load. It rode GREAT and I found that during six 180 mile trips (each way) to the Abacos (in northern Bahamas), I could comfortable keep up with 23-24' boats in seas up to about 3'! (The 20' hull is relatively light so it starts to go airborne at speeds over 20 kts in seas of about 3'. You don't HAVE to slow down at that point, as the SeaCraft hull will take a lot more punishment than you can, but it becomes progressively less comfortable as the seas build up!) Fuel consumption over those 6 trips averaged 2.8 mpg, which I considered fairly decent for that simple and reliable (but loud and smokey) motor. When I repowered in 2006, I installed a bracket that moved the motor 30" aft, AND I installed a much heavier 429 lb motor! Although I then had a 50 mph boat, it wouldn't plane below 20 kts! Given my previous experience, where I could run comfortably in rough seas, that was totally unacceptable! I figure the CG was shifted aft about 12-18", based on how much I had to move the trailer axle to keep adequate tongue weight on the hitch. By switching to a good stern-lifting 4 blade 15x15" prop and a Doelfin on the AV plate, I was able to drop min planing speed back down to an acceptable 12-13 mph. And I now have a rig with an awesome hole shot and even better load carrying ability. However, that fin has cut my gas mileage by 0.2-0.3 mpg, and I'm sure a 3 blade prop would probably be a little more efficient, so I had to make some compromises to get acceptably low planning speeds. Bottom line is you could do the same things I did with my 150 to make that heavy Honda meet my requirements, but IMHO the lighter DFI 2-strokes are a much better match for the 20' hull. However I run offshore a lot, so if you plan to use the boat primarily on flat water at 20 kts+, then maybe low speed planing and ride is not an issue for you. In that case the boat might be fine as-is for what you want to do with it! Denny
__________________
'72 SeaFari/150E-Tec/Hermco Bracket, owned since 1975. http://i188.photobucket.com/albums/z...Part2019-1.jpg
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#13
11-07-2012, 03:05 PM
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OK, my Honda 130 story.
About 10 years ago I stayed most every year for minimum of two weeks at a time at a place called Sunset Villas in Conch Key. This guy pulls in with a 25' CC ProLine with a double bracket, I'm sure it was 25'er, and he had two brand new 130 Hondas. Man was he proud, JUST had them installed the day before and never had a chance to try them out. Supposed to triple his mileage, super quiet, etc., etc. Anyway off he went, came back about ah hour later in a very foul mood, the boat would not get on plane unless two people went to the bow. But once on plane he was good to go as long as he ran a minimum of 3800 rpms. Bottom line, don't let anyone tell you too much weight hanging off the transom is not important.
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#14
11-07-2012, 03:11 PM
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Tripped over this thread again - Bigshrimpin is right on. Honda 130 is super heavy for the power. When I read 130 hp I had e-tec on my mind and probably sippin' hard cider
 Sorry . Good luck with your choice but that Honda is a questionable choice...
__________________
there's no such thing as normal anymore...
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#15
11-07-2012, 05:55 PM
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To give you an idea of the size of that Honda . . . An Optimax ProXS 300hp is the exact same weight as that Honda 130. Way Way Way too big for a 20MA IMO.
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#16
11-18-2012, 09:39 AM
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I'm running a 140 Suzuki 4 stroke on my 20'. Motors about 410 Lbs.....mounted it directly to the rebuilt 25" transom. Very happy with the results....42 mph top end...5gph fuel burn at 25 mph...boat will hold plane at 15-16 mph.......the 140 Suzuki is a great choice for these hulls and won't break the bank.
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#20
07-10-2013, 04:42 PM
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2001 ox66 200 hp
I have a 2001 20' Master Angler (25" transom) that I just repowered with a like new 200 OX66. I am running a 19P Laser II turning 5400 rpms WOT at 52 -53 mph on my Garmin. about 4% prop slip.
I have tried 5 different props and this is as close as I have come to perfection.
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