rpm @ wot

[junior1113]

93 20' hydrosport deep v 14.25 21 is the prop and i get great speed ranges but wot is at 5000 rpm good or bad

 

[ezeke]

Re: rpm @ wot

If the motor is the 1992 200HP, you could go as much as 1000 RPM higher with a better setup or possibly a lower pitch prop. The motor will last longer with a peak of at least 5,800 RPM at WOT.

What is your top speed now?

 

[tashasdaddy]

Re: rpm @ wot

21 is a lot of pitch, exactly what motor is it.

 

[junior1113]

Re: rpm @ wot

92 200 hp evinrude top speed 43 viper prop boat wieghs approx 2600

 

[ezeke]

Re: rpm @ wot

If I did the math correctly, you should have theoretical maximum speed of 53 MPH with a 21 pitch prop at 5,000 RPM. At 43 MPH you have way too much slip.

You could probably run just as fast or faster with a 19 pitch prop, have a better hole shot and not lug your engine.

 

[Benny1963]

Re: rpm @ wot

how high are you runnin,
i was runnin ,48 on a 175 crossflow with sst2 14 1/4 x21 at 5000
moved my motor up 1 ana 1/2 cav was level with bottom of transom .
then i ran 53 gps at 5600 went up 1 more inch with no loss of waterpressure
and ran 56 at 5800 with a little left ,went to turbo t1 22p and im runnin full out at 5800 57 gps check your cav plate hight and try to max out your setup
then if ya cant get the revs drop down to 19p.this is on a 17ft mckee
kinda of whaler hull ,but im also runnin smart tabs to keep the bow hop down and plane faster,at lower speed im alittle over my rating hp wize
its rated at140 im 175 at flywheel , not sayin to overrate but it is all i had

 

[junior1113]

Re: rpm @ wot

i put a 14.5 by 19 omc prop now im hitting 5400 rpm @ wot with same max speed ?????? any better or do i need to go with a 17 with a good cup thanx for all the help guys. motor seems like its as high as its going to go w/o cav

 

[ezeke]

Re: rpm @ wot

You are in a much better situation than you were with the 21 pitch prop.

All other things being equal, if it were mine, I would go for the 17 pitch or perhaps a stainless propeller if the 19 pitch is aluminum.

It is not so much about getting more speed, but maintaining the speed without lugging the engine. At 5800 RPM, your theoretical maximum speed would be 50 MPH with a 17 pitch prop.

 

[junior1113]

Re: rpm @ wot

ok so with a 19 pitch prop im at 43 mph @5350 rpms wot. i just checked the rev limiter sticker wich is at 6700 rpms any help appreciated im leaning toward a mirage 17 i also checked on moving the motor up and it is up all the way without puting in new bottom holes ty