khubard

I have been wondering the same thing..I have a Scarab 22 with 350 mag..Horse power is 400. I am running a Quicksilver 24 p and the most I can get is between 55 to 60 at 4500rpm's

gumbya55

Yea after pestering the old owner (he said it ran 72 on gps with the 24p) I found that it is a stock 454, not the mag. So I guess around 330hp? The boat is def maxed out if that's the case. I think these things are pretty heavy so getting 60mph is about it...

youravspecialist

I just picked up a 96 22' with a injected 502. I'm pushing 60 at 4000 rpm with a 24p prop. I run it in Havasu where control is key. Any suggestions on props?

gumbya55

Youravspecialist-definitely sounds like you are overproped. That 502 should be making at least 400hp. I would try a 23P Mirage Plus.

youravspecialist

Interesting... I have heard both ways. Try a 23 and a 26p 4 blade. Guess I'll give both a try and see what works better

gumbya55

I wouldnt go any higher. If your only at 4000rpm WOT than it's not making the power it should:

502 MAG MPI Specifications

Propshaft Horsepower: 415 (309 kw)
Displacement (Liter/CID): 8.2/502
Cylinders: V-8
Bore (in/mm): 4.47/114
Stroke (in/mm): 4.00/102
Compression Ratio: 8.75:1
Fuel Requirements: 87 Posted Octane (R+M)/2
Full Throttle RPM Range: 4600-5000

Lower your pitch and get more R's

khubard

Well I am going to try a Mirage 21..The problem I have is WOT is 4300 rpm's at 55 mph.. So I think I am a little over propped.

pluguglyinhere

So did you figure anything out? Just wondering because I seem to run 5000 rpm, WOT with my 4 blade 24P which seems not right since the rev limiter should come on. My motor specs say 4800 WOT so I am thinking about going to a 26P so i dont hurt the motor. I dont know because this 24P seems to work nice.

bobo1

My 90 scarab has stock 454 330 w/nose cone 23 quicksilver prop 4850 rpm perfect chop 63mph. no tabs. here's a video of it running, kinda hard to max out speed while taking video and driving at same time. http://www.youtube.com/watch?feature...&v=xI_BiZgWrdk

pluguglyinhere

Ya it seems most run either a 3 blade 23 or a 4 blade 24. It is so confusing for a first timer. I think my rpm are high, I hit 5000 or a little over like 5200 at wot. It could be off as I have read, and I also would think the rev limiter would shut it down.

I think the rev limiter hit once on me. The last ride of the season I was at wot trying to get some good rpm and gps reads to figure it our over the winter. In a big wide turn wot it shut down and kicked back in when it slowed down.

I would think to bring down the RPM I would have to go up like 26, the 23 wold raise it right?