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View Poll Results: How old is your Atomic 4 engine block?
1945 - 1950 0 0%
1951 - 1955 0 0%
1956 - 1960 5 1.48%
1961 - 1965 23 6.82%
1966 - 1970 53 15.73%
1971 - 1975 122 36.20%
1976 - 1980 116 34.42%
1981 - 1985 11 3.26%
1986 - present 4 1.19%
Don't know 3 0.89%
Voters: 337. You may not vote on this poll

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  #51   IP: 71.90.52.192
Old 06-22-2013, 06:59 AM
Laker Laker is offline
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If you have not changed plugs since 2008 and they have not fouled out in all that time , you must be doing SOMETHING right!
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  #52   IP: 207.118.20.35
Old 08-05-2013, 04:31 PM
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Thumbs up Hurrah for the Atomic 4!

Fellow Afourians;
The casting number above the flame arrestor is 112074 A, so I guess that means the block was cast on Nov. 20, 1974. Since I love my Atomic Four, I will now use this thread to give you too much information. This engine was rebuilt in 1990, again in 2001, and has had 1807 hours put on it since then. It has a mechanical fuel pump, electronic ignition, freshwater cooling, and the new Moyer freshwater pump without the grease cup. The plugs, cap, rotor, Racor filter, inline fuel filters,(one before the fuel pump and one after), and impellers are replaced every year. I change the oil every 50 hours, and put Marvel Mystery Oil in the gas and the engine oil. This year I installed a temperature alarm, glad I did, although it alarms well before the temperature gauge shows a temperature of 200. I had a few heat alarms before I replaced the salt water impeller, a Jabsco which had a small chunk out of the hub. I used to have an oil filter, but removed it on the advice of the rebuilder. He also removed the thermostat, but I installed a Thermostatic mixing valve, a Honeywell AM series, mounted next to the Moyer Heat exchanger. With it I can cruise close to 180F degrees, and can make it run colder if the alarm goes off. Since I stopped using ethanol fuel the filters don't clog as fast, and stuff stays out of the carburetor jets. I've gotten pretty good at removing, inspecting, cleaning and reattaching the carburetor. I replaced the jets once. I use about 200 gallons of premium non-ethanol gas a year. Someday i will install an adjustable main jet, but there seems to be no need for it, other than to increase mileage. I have never looked at the valves. The engine starts right up, the choke is opened as soon as it starts, and it runs very smoothly and quietly. I always leave the engine compartment open for ventilation, and keep the boat floating, covered and heated in the winter. I have a two-blade Performance Atomic-4 Perfect Pitch urethane propeller, which i replaced this year after a few years use, when during the haulout I discovered pieces broken off the ends. At 1750 RPM I can go 5.5 knots plus. I have a 1948 Blanchard 33 (built in Seattle of red cedar on oak, the original engine a Kermath) which I use to charter for daysails from Deer Harbor on Orcas Island, WA. I am now in my 13th season of operation. Last year I made over 200 3-hour trips, usually motoring less than an hour a trip. The Atomic 4, and the parts and information I have gotten from Mr. Moyer and this forum over the years, has made my business possible. I also live on the boat, which makes all this possible for me. I am having a great time with a great engine. I see no reason to consider re-powering ever with a noisy, smelly diesel engine, just to save maybe $500 a year on fuel, a fraction of my total expenses.
There's my testimonial.
Happy Sailing!
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  #53   IP: 24.224.152.244
Old 08-15-2013, 11:08 AM
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Quote:
Originally Posted by capnward View Post
Fellow Afourians;
The casting number above the flame arrestor is 112074 A, so I guess that means the block was cast on Nov. 20, 1974. Since I love my Atomic Four, I will now use this thread to give you too much information. This engine was rebuilt in 1990, again in 2001, and has had 1807 hours put on it since then. It has a mechanical fuel pump, electronic ignition, freshwater cooling, and the new Moyer freshwater pump without the grease cup. The plugs, cap, rotor, Racor filter, inline fuel filters,(one before the fuel pump and one after), and impellers are replaced every year. I change the oil every 50 hours, and put Marvel Mystery Oil in the gas and the engine oil. This year I installed a temperature alarm, glad I did, although it alarms well before the temperature gauge shows a temperature of 200. I had a few heat alarms before I replaced the salt water impeller, a Jabsco which had a small chunk out of the hub. I used to have an oil filter, but removed it on the advice of the rebuilder. He also removed the thermostat, but I installed a Thermostatic mixing valve, a Honeywell AM series, mounted next to the Moyer Heat exchanger. With it I can cruise close to 180F degrees, and can make it run colder if the alarm goes off. Since I stopped using ethanol fuel the filters don't clog as fast, and stuff stays out of the carburetor jets. I've gotten pretty good at removing, inspecting, cleaning and reattaching the carburetor. I replaced the jets once. I use about 200 gallons of premium non-ethanol gas a year. Someday i will install an adjustable main jet, but there seems to be no need for it, other than to increase mileage. I have never looked at the valves. The engine starts right up, the choke is opened as soon as it starts, and it runs very smoothly and quietly. I always leave the engine compartment open for ventilation, and keep the boat floating, covered and heated in the winter. I have a two-blade Performance Atomic-4 Perfect Pitch urethane propeller, which i replaced this year after a few years use, when during the haulout I discovered pieces broken off the ends. At 1750 RPM I can go 5.5 knots plus. I have a 1948 Blanchard 33 (built in Seattle of red cedar on oak, the original engine a Kermath) which I use to charter for daysails from Deer Harbor on Orcas Island, WA. I am now in my 13th season of operation. Last year I made over 200 3-hour trips, usually motoring less than an hour a trip. The Atomic 4, and the parts and information I have gotten from Mr. Moyer and this forum over the years, has made my business possible. I also live on the boat, which makes all this possible for me. I am having a great time with a great engine. I see no reason to consider re-powering ever with a noisy, smelly diesel engine, just to save maybe $500 a year on fuel, a fraction of my total expenses.
There's my testimonial.
Happy Sailing!
Not bad at all. Thanks for chimming in there Capt.
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The optimist expects it to change.
The realist adjusts the sails.
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  #54   IP: 75.48.78.31
Old 09-03-2013, 07:18 PM
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How old is me Atomic 4 ya ask? Son, ya never ask an old gal her age...

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  #55   IP: 174.94.35.74
Old 09-20-2013, 09:07 PM
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1967 early model with some late model features...such as late model transmission cover with rear oil fill - hoping to change it back to the early version with hinged oil fill cover on the accessory drive.

(Photo is from early 2009 - things looking a lot different down below now!)

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  #56   IP: 166.205.55.39
Old 12-28-2013, 11:17 AM
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how old is your A4

Hi All,
mine is a 1980, still ticking, though ethanol gas caught up to me this year. time for new carb
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  #57   IP: 174.58.84.3
Old 12-28-2013, 10:49 PM
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biohead, what happened to the carb? How did alcohol hurt it?

Last edited by romantic comedy; 12-28-2013 at 10:51 PM.
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  #58   IP: 174.67.229.161
Old 03-18-2014, 01:49 AM
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I finally found what I assume is my serial number, under the flame arrestor.
265669, I think, and 'Feb', can't discern any more. What year would that be? Mid 60s I'm assuming.
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  #59   IP: 71.59.69.172
Old 12-28-2014, 11:02 AM
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by the numbers

My day has enough fun planned in it to get greasy so I was wondering about the actual age of my A4.
From what I can gather from this thread my block was cast on 5/31/72. Casting # 295369 U
Ser # 179077

Considering she is in a 1974 hull I'm assuming it took two years before she made her way into a boat installation .

I was half hoping for find she was younger than the hull which would suggest a previous engine swap.
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  #60   IP: 71.59.69.172
Old 12-28-2014, 11:05 AM
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the pictures I know you all love pictures

so she is 42. I wish I was 42 again
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  #61   IP: 64.118.27.117
Old 08-09-2015, 08:34 PM
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Here are my block numbers:

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  #62   IP: 184.100.65.63
Old 10-25-2015, 06:22 PM
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New to the forum and just finished my first successful season with my Tripp 30 Hull # 4 with the Atomic 4 inboard.
Will have to check for year, but I have an early model block/starter/distributor, and late model head/carb/water pump and a few MMI upgrades.
Motor ran great and I have learned a lot, love that motor.
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  #63   IP: 184.100.65.63
Old 10-26-2015, 12:54 PM
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  #64   IP: 172.56.20.32
Old 07-05-2016, 09:13 AM
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I haven't looked at the block numbers but I know this is the original machine that's in my 1967 C&C Corvette.....
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  #65   IP: 67.237.237.64
Old 08-08-2016, 11:43 AM
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Stevedore?

How odd... In my defense, the label is obscured behind the FWC pulley, but I never noticed before that my engine is labeled "Atomic Stevedore." Is there any particular significance to this model name? It seems an add choice, since a stevedore has nothing to do with propulsion. But not more odd than many Asian automobile model names, I suppose.

Of course, these forums provided the answer... Gotta scroll down to "page 2" of search results to find the useful ones from more than ten years ago! Will have to remember to check for the "restrictor" next time I have the carb off. I'd guess that would have been removed by now.

Last edited by toddster; 08-08-2016 at 03:46 PM.
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