'93 MX20 prop issue

patrickrk · 07-29-2013, 03:13 PM

I've been looking for someone on here with a similar boat. I recently purchased a 1993 MX20 with 5.0L V8 alpha 1 outdrive. Took it out for the first time this weeekend. Not impressed with the time it takes to get on plane. What size prop are you running? I have a 14x23 and imagine that might be part of the problem. I'd like to pull a wake boarder / tuber, but imagine then thing might never plane out. Any suggestions would be greatly appreciated.

***ColoradoDiablo*** · 07-29-2013, 04:10 PM

What's your WOT? Need to be right around 4400-4800 rpm.

That sounds like a lot of prop for that combination.
Should be a 19p or maybe a 21p , but that's pushing it.

***mikeyt*** · 07-29-2013, 04:36 PM

Quote:

Originally Posted by ColoradoDiablo

What's your WOT? Need to be right around 4400-4800 rpm.

That sounds like a lot of prop for that combination.
Should be a 19p or maybe a 21p , but that's pushing it.

A 23" prop is way too much for that combo. I agree with Larry thoughts on the 19" or 21" (at most)

But since this is now getting into just a prop discussion, i'm going to move part of this thread to the Prop Talk section.

Dozer · 07-30-2013, 05:19 AM

19" came on the 20 ft boats with the 5.0 liter. 21" gives a little higher top end but will be high on the revs.

***ColoradoDiablo*** · 07-30-2013, 05:46 AM

And slooowww out of the hole.

***mikeyt*** · 07-30-2013, 01:12 PM

Quote:

Originally Posted by Dozer

19" came on the 20 ft boats with the 5.0 liter. 21" gives a little higher top end but will be high on the revs.

Not quite. Increasing the pitch lowers the rpms at WOT....

Personally i would suggest a 20" - 4 blade prop in SS for what you are planning to do.

Dozer · 07-30-2013, 07:11 PM

Haha. You're right Mikey. Needed some sleep apparently.

patrickrk · 07-30-2013, 08:10 PM

Thanks.
Considering trying the smart tabs first as they are less expensive and would probably be beneficial no matter what prop I end up with.

***mikeyt*** · 07-30-2013, 09:53 PM

Quote:

Originally Posted by patrickrk

Thanks.
Considering trying the smart tabs first as they are less expensive and would probably be beneficial no matter what prop I end up with.

The Smart Tabs will not fix that prop issue. With the 23" you are putting a lot of unnecessary strain on the engine and outdrive at low-mid range speeds and the engine rpms are not getting up into the manufacturer's recommended RPM range at WOT. But.... your boat, your call.

patrickrk · 07-31-2013, 03:00 PM

Took your suggestion and just ordered a 20" 4-blade. Will let you know how it works out. Thanks again.