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Thread: 1971 Donzi Classic 18 power....
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02-16-2017, 07:11 AM #1215000 RPM
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Talked a few hours last night about possible engine upgrades...in addition to redoing the rotating assembly (including a forged crank & lighter-weight pistons, the discussion of the flywheel surfaced. The flywheel I have seems VERY heavy and of course that's energy loss on acceleration and a hit on engine response time (from an inertia standpoint). Is there a lighter-weight flywheel that will fit in the Bravo One environment? If so, what coupler would be used?
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02-19-2017, 09:10 PM #1225000 RPM
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It was also recommended I pickup a hydraulic? balancer for the front of the engine....he said the production won't stay together. Any recommendations?
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02-20-2017, 12:19 AM #123
The stock balancers can spin the outer ring, a fluid dampr works fine.
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02-20-2017, 11:50 AM #124Screaming And Flying!
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I know that you are leaning heavily toward a used option but here is a really good article you might want to check out on the 383 motor that comes with a warranty. You might want to see if Merc will offer 0 percent financing on it given your budget is limited. Sometimes this time of year they have some interesting options. Lot of motor for $10k and peace of mind. Maybe they would roll in the installation at a dealer and for no upfront money you could be into it for a 12 month note.
http://www.boattest.com/oem/497/engines/29500118/3
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blacktruck liked this post
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02-20-2017, 08:24 PM #125
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02-20-2017, 08:26 PM #126
Do you have pics of your boat?
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02-20-2017, 09:33 PM #127Screaming And Flying!
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That's still a very mild 377 with iron heads for 10k. No fuss, turn key.
Last edited by FMP; 02-20-2017 at 09:42 PM.
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02-20-2017, 09:46 PM #128
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02-20-2017, 09:51 PM #129Screaming And Flying!
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Mild and reliable, but for 10 you could build a stroker with much more and still be turn key. Not saying that's better in this case, but 100% doable.
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02-20-2017, 10:16 PM #130
Paying for someone else to do a 400 HP stroker, with a good block and really good marine marine parts for less than $10k? Maybe, I'd be surprised though. I haven't built an engine in a long time. Factor in the warranty, resale etc. Not even a contest to me. An extra 20 to 30 hp in that boat won't get you much speed either.
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02-21-2017, 06:27 AM #131Screaming And Flying!
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I'm frugal build your own with 75-100 more HP.
Last edited by FMP; 02-21-2017 at 07:06 AM.
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02-21-2017, 07:43 AM #1325000 RPM
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I understand and very much appreciate all the comments on what to build, but I have very little money to put in this. I get the fact that $10,000 will get me there (maybe with a suspect motor), but I'm trying to do with much much less. Many of you have added information that has really pointed me in a different direction....and in some cases a safer direction! That's worth gold and my kids appreciate that!
My low-budget build starts with a 1991 2-bolt Mercruiser 350 pulled from a bow rider. $1000 for the whole boat and have sold $3400 worth of parts.....so I am partially funded. I kept the donor trailer and am modifying to lower the boat/trailer CG as I like to travel fast and the original trailer is a higher-CG unit.
The motor is down to the block now. I picked up a set of L31 5.7L Vortec heads, casting number 12558062. Based on what I've read, these are a very big enabler (for min cost engine development). I'd love to buy some Dart or other fast-burn heads, but they don't compare to the $75 I paid for these. I'll have the block checked, get some stronger/splayed mains, an affordable (?) forged crank and pistons and see what I have. I'll also do some of the recommendations to the heads and profile the CR....will see how it goes.
Regarding the boat: Its nick name is Eleanor since it is (was) yellow and wasa rat boat and reminded me of the original "Gone in 60 seconds" Mustang. . Paid a few thousand for it, but the hull was really gouged up from driving onto trailers sideways and over rocks. I have removed every scrap of wood in it, replacing with new, improved structure & new gelcoat. Before and after for the hull......more to come.
My wife want to know if she posted Donzi on my head if I'd pay more attention to her!
Last edited by Classic18; 02-21-2017 at 11:34 AM. Reason: typo
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02-21-2017, 07:55 AM #1335000 RPM
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02-21-2017, 08:24 AM #134Screaming And Flying!
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Can't remember right now about the L31 or cast # but you want the 1/2 ton heads not the 3/4 ton heavy truck heads. The 1/2 ton out flow and make more HP. Also check them for cracks.Ran them on a heavy K20 with great results just under 10:1,then went to aluminum .Just checked, those are the 1/2 ton heads.Either way they make great power, with less adv.
Last edited by FMP; 02-21-2017 at 08:50 AM.
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02-21-2017, 08:54 AM #1355000 RPM
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