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  1. jimmbo

    Sacrificial Aluminum Prop

    Deleted
  2. jimmbo

    Sacrificial Aluminum Prop

    Yes, I am. There is some Misconception that these Blades are so weak/flimsy they flop around like the Blade is on a Pivot. While there may be a bit of Flex at Extreme Speeds(well past 100mph), it is still gonna be a very tiny fraction of an Inch. But it has been a Wonderful Marketing Sham to...
  3. jimmbo

    Sacrificial Aluminum Prop

    40mph Speed Limit for a Prop? That is a New One Reading the Chart, shows approx what Top Speed would be if the Engine was at top rpm, and that was taken into account for the Load If you use a Prop that is too low in pitch for the Load, the Top Speed you will get will be higher simply because the...
  4. jimmbo

    Props

    I don't think there is enough Space between the Propshaft and the Anti-Ventilation Plate to swing the Merc V6/Mercruiser Props.
  5. jimmbo

    Power steering pump cutting radiator hose - how did you guys fix yours?

    In the 1980s, Olds 307s were known to have the Lower Rad Hose cut by the Belts. GM made a Hose Clamp that had a Shield attached/sticking out that put a Metal Barrier in the Way. I can't find the GM Part#, but it looked like this
  6. jimmbo

    What year is this Johnson?

    If Racer says it is a 1990, Chances of it being a 1990, are about 99.5+%
  7. jimmbo

    Volvo Penta Trim Questions

    I rarely look at the Trim Gauge, when trimming. I use my ears and the Seat of my Pants. I trim up until the Boat begins to Porpoise for any given Speed, then trim a Tad in. At higher speeds, 50+, I keep an eye on the Water Pressure Gauge, and my Ears tuned for the Sound of the Prop losing Bite...
  8. jimmbo

    Random change in rpm at wot...BIG CHANGE

    What does it do at WOT, rpm wise? 85% throttle means nothing, as the Rpm change is Not Linear to Throttle change.
  9. jimmbo

    Difference

    Since we aren't able to examine the 2 Props to see any Differences in Blade Design(Shape and Area), Cup and Rake, even Blade Thickness, a firm Answer is not really Possible. Props of different Brands, or Models, throw all kinds of Curves to the Answer, even if they have the Same Dia, and Pitch...
  10. jimmbo

    Process for changing boat trailers?

    Lengthening the Trailer would have made Backing Up Easier, adding to the Hitch, will certainly make it more Challenging
  11. jimmbo

    Process for changing boat trailers?

    Do what you want, it is your Truck, Boat and Insurance
  12. jimmbo

    Process for changing boat trailers?

    You might want to reconsider about towing with the Extension in Place, as it will reduce the Weight applied to the rear of the Tow Vehicle, and increase the Chances of the Trailer Fishtailing.
  13. jimmbo

    1970 Evinrude 18hp Trottle issue

    To me that Head Gasket looks like it has been reused a few Times. Head needs a good cleaning and checked for Warpage and a Lapping What do the Crowns of the Pistons look like? Covered in wet blackish Goo?
  14. jimmbo

    Process for changing boat trailers?

    A bit of Paint Remover should make the Trailer Vin Sticker Visible You could McGiever an Extension that you could attach to the Trailer Tongue to add a few feet. Since you have a Truck, it could be kept in the Box, when towing to and from the Launch
  15. jimmbo

    25 HP 4 stroke vs 40 HP 2 stroke???

    I prefer the 2 Stroke, better hole shot, the Sound, and the Sweet Smell of the Burnt TCW Oil, plus the added Bonus of Mosquito Control
  16. jimmbo

    Prop, or Engine Issue?

    A 1975 70hp would have a WOT Range of 4500 - 5500 rpm, so you are within the recommend range, but being closer to 5500 rpm would certainly be better for Engine Longevity and Hole Shot. However if the Engine is not in Good Mechanical Shape, or is not getting Fuel and or Spark, timed correctly, it...
  17. jimmbo

    25 HP 4 stroke vs 40 HP 2 stroke???

    A 2 stroke crank rated 40 will blow the doors off of Prop Rated 25hp 4 Stroke Heck a Crank Rated 20hp 2 stroke would beat the 25hp Prop Rated 4 Stroke, except in top speed, but the 20 would be across the lake and back before the 25 would hit top speed
  18. jimmbo

    Why is finding information on boats so difficult?

    You made NO Mention of it in this thread. And no one here is obligated to do a Search of any other Posts you make, in order to find Needed Info
  19. jimmbo

    Why is finding information on boats so difficult?

    You don't say what Make your I/O is, what HP, or even what Year. Mercury maintains a Database of all of its Serial Numbers, as the Parts Departments at Dealers do look parts up that Way.
  20. jimmbo

    25 HP 4 stroke vs 40 HP 2 stroke???

    With the Extra Weight and a Drop in Horsepower, I can't see how you would expect Similar Performance. Even a Crank Rated 40hp 2 Stroke will leave a Prop Rated 40hp 4 Stroke far enough behind that you could be across the Lake and Back before the Prop Rated 4 Stroke could overtake the 2 Stroke,
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