1989 242ss prop/exhaust
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Hey all,
Just thought I would let you know how my prop change worked on my boat. 89 242ss with 330hp/bravo 1 outdrive. I put emi thunder exhaust on this winter and changed to a 22pitch bravo1 4 blade prop. Before the exhaust i was running about 49mph right at 4600 rpm with a 21pitch mirage. After the exhaust manifold change i was at 50mph at about 4750 rpm. I put the 4 blade bravo 1 prop on and now i am seeing 56mph at 4200 rpm and much better on gas and the boat rides much better, the prop lifts the whole boat up, i would recommend this prop to anyone with an older single engine formula.
Just thought I would let you know how my prop change worked on my boat. 89 242ss with 330hp/bravo 1 outdrive. I put emi thunder exhaust on this winter and changed to a 22pitch bravo1 4 blade prop. Before the exhaust i was running about 49mph right at 4600 rpm with a 21pitch mirage. After the exhaust manifold change i was at 50mph at about 4750 rpm. I put the 4 blade bravo 1 prop on and now i am seeing 56mph at 4200 rpm and much better on gas and the boat rides much better, the prop lifts the whole boat up, i would recommend this prop to anyone with an older single engine formula.
#2
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Hey all,
Just thought I would let you know how my prop change worked on my boat. 89 242ss with 330hp/bravo 1 outdrive. I put emi thunder exhaust on this winter and changed to a 22pitch bravo1 4 blade prop. Before the exhaust i was running about 49mph right at 4600 rpm with a 21pitch mirage. After the exhaust manifold change i was at 50mph at about 4750 rpm. I put the 4 blade bravo 1 prop on and now i am seeing 56mph at 4200 rpm and much better on gas and the boat rides much better, the prop lifts the whole boat up, i would recommend this prop to anyone with an older single engine formula.
Just thought I would let you know how my prop change worked on my boat. 89 242ss with 330hp/bravo 1 outdrive. I put emi thunder exhaust on this winter and changed to a 22pitch bravo1 4 blade prop. Before the exhaust i was running about 49mph right at 4600 rpm with a 21pitch mirage. After the exhaust manifold change i was at 50mph at about 4750 rpm. I put the 4 blade bravo 1 prop on and now i am seeing 56mph at 4200 rpm and much better on gas and the boat rides much better, the prop lifts the whole boat up, i would recommend this prop to anyone with an older single engine formula.
Very interresting reading! A hugh change in top speed *S*
How is the midrange, and is slow to plane?
The 454 330 hp should hva aprox 4400 to 4600 rpm on full
throtle
I have a 1988 242 SS with 454 330 hp and 17 mirage pluss
and need to change the prop.
I was thinking to buy a 19 mirage, but after your results I consider change and try a 4 blade brovo 1 prop.
What kind of pich does it have??
best regards
from Oslo, Norway
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On my 242LS I run a Bravo1 four blade 22p labbed a run it to about 4500-4600 RPM. The best is 54.7 gps.
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the bravo is a 22pitch prop. The new manifolds gained me about 12-1500 rpm with the old prop-mirage 21pitch. my speeds are on the stock speedo which I have compared to gps and it is optimistic by about 1-2 mph, meaning i had 49.5 on gps when the speedo had read about 50-51
Last edited by seef158; 07-27-2008 at 11:22 AM.
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A friend of mine had a 242 with a 502 mag. He went from a 23 Mirage to a 24 Bravo and picked up an honest 5 mph at 3000 rpms. About 1 mph gain top end because he could trim higher without the prop losing its bite.
Next step was a warmed over HP500 at 535 hp and picked up 8 more mpg top end for a total of 69.9 GPS
Next step was a warmed over HP500 at 535 hp and picked up 8 more mpg top end for a total of 69.9 GPS
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A friend of mine had a 242 with a 502 mag. He went from a 23 Mirage to a 24 Bravo and picked up an honest 5 mph at 3000 rpms. About 1 mph gain top end because he could trim higher without the prop losing its bite.
Next step was a warmed over HP500 at 535 hp and picked up 8 more mpg top end for a total of 69.9 GPS
Next step was a warmed over HP500 at 535 hp and picked up 8 more mpg top end for a total of 69.9 GPS
I 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 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 or bravo1?
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??