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TOPIC: '57 Merc Refresh

'57 Merc Refresh 17 Jan 2020 15:08 #101441

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Very nice. That's exactly what I was looking for. They repop that 8,000 rpm tach for classic cars.

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'57 Merc Refresh 17 Jan 2020 13:08 #101440

I just bought one of these of eBay its an old SUN RF-11, I have not even received it yet. I am not sure if it will work but I've been hoping to try one for a while but they can be pricey. I got lucky and got this one for $50 including shipping charges. It is for magneto ignitions 1,2 or 4 cylinders and 2 cycle. To me it seemed like the perfect tach for an early outboard but I cannot find what they were originally marketed towards. To get the signal I was thinking of tapping off the wire to the cut-out on my '56 Johnson 30hp, the other two connections are simply ground and power. They are rather big (deep) and I am not sure if it will fit behind my dash in the DR with the steering cables there, this is an experiment. They also made a SUN RF-1 that goes to 8,000 RPM, they seem to be more common and show up on eBay more often than the RF-11 that only goes to 6,000 RPM. The one I got is the only one I have seen in a year and a half of searching for one.

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1952 Deluxe Runabout 1956 Johnson 30hp
Last edit: by The Art Doctor.

'57 Merc Refresh 17 Jan 2020 12:14 #101439

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Thank you both, good information there.

Now I guess that leads me to the next question that's been lingering in the back of my cluttered mind.
Has anyone hooked up a tach to these? I'm not really crazy about those digital tiny tach's. To me that's like putting a big modern red dot scope on my black powder Kentucky rifle. It just doesn't fit. I'd rather have a plain old analog tach.

I know a regular automotive tach won't be accurate and where does the tach get its signal from on these engines ?

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Last edit: by Moe.

'57 Merc Refresh 17 Jan 2020 03:48 #101438

Ray is right, you need a starting point. a tach is what you need if you are going to be messing around with props. You want a prop that is going to give you the most RPM's otherwise you are leaving HP on the dock "table" pun intended... Lol.

I started with a 13 pitch 2 blade on my 400. I was well under the max RPM range 47-4800 maybe. I then switched to an 11 and pesto my RPM's went up and so did my top end.

I then thought about cupping an 11 to get a little more bite. Cupping lowered my RPM's and the motor just did not feel right. "Maybe a bad cup job" I don't know.
I even went down to a 10, but that made my RPM's go WAY UP.

I put my 11 back on and I couldn't be happier skipping around at 35 mph. :biggrin:

It's all trial and error, but you need to know your RPM's
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Mercury Marc, 1958 Hawk II, Merc 400

'57 Merc Refresh 17 Jan 2020 02:57 #101436

First, if you have not run this prop on your boat with an accurate tach I would wait until you know what RPM this prop will produce with your setup.
Props are notorious for being + or - on pitch, sometimes quite a bit, and it is just as easy to slow a boat down by making the wrong adjustments as it is to speed it up.
Adding cupping will usually act like you have added pitch and if you don't need more pitch you may lose speed and acceleration.
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“When the power of love overcomes the love of power the world will know peace."

'57 Merc Refresh 17 Jan 2020 00:13 #101435

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Well I picked up a 12" pitch prop off local craigslist, currently have an 11" pitch prop.
Does anyone have any thoughts or wisdom on cupping these? Or having one cupped? I like going fast as possible. . . .



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'57 Merc Refresh 13 Jan 2020 17:51 #101365

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[/quote]



That will probably be me . . . accept I have an '03 springfield and not an M1 garand.

"GET OFF MY LAWN !!"
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Last edit: by Moe.

'57 Merc Refresh 13 Jan 2020 12:31 #101353

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The crank is pretty spotless. I broke my last Wilton pressing ball joints so I had to upgrade, it should outlast me.
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'57 Merc Refresh 12 Jan 2020 22:17 #101337

Moe wrote:

Took some time to clean my bench as the top was getting hard to see . . . Crank cleaned up nicely


This may sound funny...... But I have a LOVE for vices, hold downs and clamps. That is one bad ass benchtop vice!!

Oh and the crank looks good too B)

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Mercury Marc, 1958 Hawk II, Merc 400

'57 Merc Refresh 12 Jan 2020 21:10 #101336

I salute you, Sir !!

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