Thread:

Impellor chart

Originally Posted by BAJA JA

This site is really starting to blow. Everything asked turns into a pissin match, or turns into a 1500 HP post. Most of us are happy with what we got, just curious about things. Most posts people already know the answer their looking for just want a little honest feedback.

Pretty broad statement. EVERYTHING ASKED I'm pretty sure your question was answered during the course of all the blow. Weed through what you don't care to read and take it as it is. There is an ignore feature that you can use if you don't care for what someone posts.

Originally Posted by BAJA JA

If a pump is recently rebuilt and the RPM's are lower due to a tighter pump then according to the impellor chart I have less H.P. Is the impellor chart based on a new pump? Just trying to figure about where my H.P. is. I turn about 4300 with an SS "AA" impellor Berk.

Originally Posted by BAJA JA

Would a bowl stuffer change the curve much? I know since every thing was done it runs WAY WAY more efficiently. Just seems like I'm way down on H.P. now according to the chart. Tottally rebuilt 454 and berk pump with SS "AA" imp and a bowl stuffer. Stage 1 rebuild. Turns about 4300 @ 58 MPH. Does this seem like its in the ballpark.I like the way it runs. Just curious.

Originally Posted by BAJA JA

This site is really starting to blow. Everything asked turns into a pissin match, or turns into a 1500 HP post. Most of us are happy with what we got, just curious about things. Most posts people already know the answer their looking for just want a little honest feedback.

really???? and how much money did you pay the moderator for the rights to even ask a question on performanceboats.com???

fact #1 is, every time an impeller chart related question is asked, there are numerous opinions expressed regarding their accuracy. they are NOT going to be 100% accurate in any case, and in some cases will be a very long way from 100%.

fact #2 is, the question you asked has NOTHING TO DO with an impeller chart. and since the dickheadedness has come out, not going to waste my time with it. you "already knew the answer" and only posted a question to argue with it???

fact #3 is, there are a lot of responses in this thread from people with a lot more knowledge and experience than you have, and that's where these threads go. if you didn't like it, you could have re-directed it somewhere else or just dropped out of the whole thing.

fact #4. it's an IMPELLER, not an IMPELLOR.

essentially, if you don't like it then go away. maybe try your luck over on the touchy feely boat forum. you'll probably find it right next to the hope and change forum...

^^^

Originally Posted by cs19

Heres one... How does turning a prepped out C (8.500 at 33 deg) with 1125 hp to 6830 rpm at damn near sea level fit your chart?

This is certainly a question for Sleeper...

So Jon... get to it... we need a chart, graph, or at least a formula that will have all those numbers. Perhaps you could also add in a way to factor hull design, color of pump, some sort of unknown varaible for the taste of the water.

Originally Posted by six-oh-nine

This is certainly a question for Sleeper...

So Jon... get to it... we need a chart, graph, or at least a formula that will have all those numbers. Perhaps you could also add in a way to factor hull design, color of pump, some sort of unknown varaible for the taste of the water.

Is said boat running twisty headers ?

I have to add, what does CS19 detailed "C" have to do with the original question? We all know that a race prepped imp isn't going to act look the same as the chart shows.....howerver each and every race prepped impeller will have it's own curve depending on the detail work on it and the bowl used.

S CP

Originally Posted by cs19

Heres one... How does turning a prepped out C (8.500 at 33 deg) with 1125 hp to 6830 rpm at damn near sea level fit your chart?

Did you just trim the back of the impeller or did you touch the face too?

S CP

Originally Posted by bp298

really???? and how much money did you pay the moderator for the rights to even ask a question on performanceboats.com???

fact #1 is, every time an impeller chart related question is asked, there are numerous opinions expressed regarding their accuracy. they are NOT going to be 100% accurate in any case, and in some cases will be a very long way from 100%.

fact #2 is, the question you asked has NOTHING TO DO with an impeller chart. and since the dickheadedness has come out, not going to waste my time with it. you "already knew the answer" and only posted a question to argue with it???

fact #3 is, there are a lot of responses in this thread from people with a lot more knowledge and experience than you have, and that's where these threads go. if you didn't like it, you could have re-directed it somewhere else or just dropped out of the whole thing.

fact #4. it's an IMPELLER, not an IMPELLOR.

essentially, if you don't like it then go away. maybe try your luck over on the touchy feely boat forum. you'll probably find it right next to the hope and change forum...

i thought you were going to cut him some slack.........Lol


S CP

Originally Posted by cs19

Uhh, wait a sec.. Isn't the thread named impeller chart? And were you not discussion sizing and rpm a page back? Just throwing an example out there and my point is those charts are way off when you start making things better like you said earlier. I see guys turning A impellers the same or more RPM as my C with simliar HP all the time.

Non twistys, impeller is worked everywhere, non HH stainless AMT impeller.

Most certainly.

S CP

Originally Posted by Sleeper CP

i thought you were going to cut him some slack.........Lol

S CP

i did. i was much too nice.

now i am confused. as the senior ranking pb graphologist, why would it matter for graph purposes what headers cs ran? you -should- have asked what it turns in 7000' da, in 90 degree water (too late now). because.... you have absolutely no idea (zero, zilch) what the conditions were when any of these original graph numbers were determined (i.e., there is NO standard). that is if (big IF) all the graph numbers were actually obtained and validated from testing, rather than extrapolation.

Originally Posted by bp298

i did. i was much too nice.

now i am confused. as the senior ranking pb graphologist, why would it matter for graph purposes what headers cs ran? you -should- have asked what it turns in 7000' da, in 90 degree water (too late now). because.... you have absolutely no idea (zero, zilch) what the conditions were when any of these original graph numbers were determined (i.e., there is NO standard). that is if (big IF) all the graph numbers were actually obtained and validated from testing, rather than extrapolation.

If I recall correctly the Jac Sea charts were actually done by submerging a pump 400' down a well and spinning it with an electric motor and reading the amps required for each size impeller. ( Best I recall )

I heard that amps aren't dependant on weather conditions, believe it or not

I asked Cs about the twisty headers because I once read on Hot Boat.com that twisties were worth 10 mph. ( )

S CP

Originally Posted by Sleeper CP

If I recall correctly the Jac Sea charts were actually done by submerging a pump 400' down a well and spinning it with an electric motor and reading the amps required for each size impeller. ( Best I recall )

I heard that amps aren't dependant on weather conditions, believe it or not

I asked Cs about the twisty headers because I once read on Hot Boat.com that twisties were worth 10 mph. ( )

S CP

shocking!

jon, please explain to me how amperage is converted to hp...

are you positive that amps are not affected by weather? could they possibly be affected by anything else??

also, what does mph have to do with how much hp it takes to turn an impeller??? do you have a new mph/impeller graph you haven't shared with us yet???