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-   Drives and Lower Units (https://www.offshoreonly.com/forums/drives-lower-units-217/)
-   -   Prop Slip or ?? (https://www.offshoreonly.com/forums/drives-lower-units/331667-prop-slip.html)

phragle 10-16-2015 07:56 PM
is the prop clean, no dings etc......

Baja170 10-16-2015 07:56 PM
Crap. Thank you for pointing that out. I have terrible eyes and probably should not post from the phone.

rbpowered 10-17-2015 04:55 PM
Originally Posted by phragle (Post 4367085)
is the prop clean, no dings etc......
Umm.... It was that day. Not so much after it got into the ramp while pulling it on the trailer. I'll post a pic, should be good for a laugh.

It was an aluminum prop and did have some bends to it previously but it was hammered and dollied out very nicely. Just a few very minor chips in the edges, tip of your fingernail size.

I have a 21p SS Mirage I can throw on it. I'm guessing one of the 27p Mirages off of the Scarab wouldnt be a good choice right?

Tinkerer 10-17-2015 07:36 PM
If it is an aluminum prop it could be blade flex. Are there any flex lines on the blades?

Griff 10-17-2015 08:02 PM
Originally Posted by rbpowered (Post 4367066)
Engines good. 170 compression across the board, no blow by at all.

The marina that dewinterized it claimed 58 mile an hour at 5300 rpm on their test run. All I have changed is a distributor since the pickup went out on the other one and was on backorder. Timing is at 32 degrees at 3000. Was going to play with timing but a bad shift cable bellow was letting in more water than I was comfortable with so didn't want to sit around floating for long. Going to try to fix that tomorrow and try it out again with a different prop and the coupler marked on Sunday.

Should timing be different than what its at now?
How to set the timing depends on what ignition and possibly what ignition module you have.

I think your main issue is a prop issue.

rbpowered 10-17-2015 08:45 PM
Originally Posted by Griff (Post 4367354)
How to set the timing depends on what ignition and possibly what ignition module you have.

I think your main issue is a prop issue.
Mallory YLE624AV Distributor and a regular ignition coil. No other module. Set base timing at 10 degrees, ran it to 3000 rpm and saw 32 degrees. Didnt run it any higher though. Most systems add 20 on top of base I believe.

Griff 10-18-2015 12:08 PM
Rev it until the timing does not advance any more and then set it at 32-34* total.

phragle 10-18-2015 01:05 PM
You have a hammmered on alum. prop, Find yourself a decent 21p stainless mirage or similiar, a little looking you can pick one up used for 100 bucks. Next question,,,What effect does drive trim have on the problem?

rbpowered 10-18-2015 04:26 PM
Originally Posted by phragle (Post 4367537)
You have a hammmered on alum. prop, Find yourself a decent 21p stainless mirage or similiar, a little looking you can pick one up used for 100 bucks. Next question,,,What effect does drive trim have on the problem?
I have a SS 21p Mirage sitting on my desk. Gonna throw it on after I replace the shift cable bellow.

Trim seemed to have no effect on it at all.


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