Prop question on a 242 ss 454 330 hp
 

have a 242 SS 1988 with a standard 454 330 HP 1997
GenV. The prop is a Mirage Pluss 17, I know the prop
is to "small"
Ex.:
3200 rpm my speed is 28 miles
My rpm is much higer then it is supposed to be, but I have
never taken it higer then 4500 then I get aprox 42-43 miles.

I have a lot more throttle to give but, I havent let the engine
gone over the 4500 rpm.

I am going to buy a new propp, but I am not sure what kind of
prop either mirage P19, mirage P21 or bravo1 4 blade 20

My normal boating is 2-4 people some gear, I am not to stressed by top speed, but of course everybody want his boat
to go as fast as possible.

I would like it not to be to slow to plane, and have a good midrange preformance.

So what should I go for??

Before you buy one try a 21 Mirage i would then go to a 23 Mirage. After that try a 22 4 blade bravo one. I had a 272 that i ended with 23 mirage.

I still run a 23P Mirage 3 blade now, reasonably good performance even when I had the 454mag in it..

R

Guys thank for your replies

Remember I have 7,4 l wit 330 hp and not a Magnum
I am afraied that more then 21p could be to much?

Nope 23 should be fine.

A friend has a 242/330 combo and runs a 21 Mirage and gets 53/54 mph. I'd also try a 22 Bravo. Will definitely increase midrange speed. Another friend had a 242/502 Mag , went from a 23 Mirage to a 24 Bravo an picked up 5 mph at 3000 rpms

23 will be too much for the 330. Stick with the 21, you'll be happier.

Thirdbirds correct .... I had a 90' 242LS 330 b1 1.50 gears with a 21p ss mirage, hole, midrange, topspeed 51-52 good luck.

Hi Guys

Thanks a lot for all the replies, I am leaning to a mirage 21
I will tell you how it went when I have tested the prop
:drink:

Hey, I have a '89 242 SS with a stock 454ci 330hp package and I upgraded from a 19 to a 23 pitch and I am very happy with the result. 56.7mph @4600rpm on gps.

Oh by the way, I'm new to OSO and this site is AWESOME!

Hi that is very fast for a 242 SS, Formula put top speed
52 mph in the factsheet with this engine

How does it preform midrage and hole?

What is your speed at 3200 rpm?

what was the speed with the 19 p?

Any range wich where better with the 19 p?

It's not too bad out of the hole and midrange is quite good. I don't know what the speed is at 3200, I guess I just don't pay attention to the speedo but its a comfortable cruising speed. I never did have the 19p at full throttle because it was 5000+rpm, I didn't want to push it.