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View Full Version : B impeller to small...??


BOOGEYMAN
07-23-2007, 01:36 PM
I have a 20 ft sleefcraft tunnel with a 502 and a berk JC. Right now I have a an AA impeller in it and it spins 5000 and gps around 69. A buddy has a B impeller I was thinking about trying because he wants to try my AA with his blown bbc/dominator set up.
Do you think this will help or hurt me? How much more rpm can I expect? I was thinking 500 more......Anyway any help wopuld be great before I pull the trigger and pull it apart.
Thanks again!!
Travis.
Taylorman
07-23-2007, 01:47 PM
Depends on where your cam makes power. AA 5000 rpms should be around 500 hp.
BOOGEYMAN
07-23-2007, 01:49 PM
The guy I bought the boat from said the engine made 512 @ 5300-5400.
Travis.
Sleeper CP
07-23-2007, 02:18 PM
The guy I bought the boat from said the engine made 512 @ 5300-5400.
Travis.
Have you seen the Extended Impeller Chart that I posted some time back. Look for it, I think you're a good candidate for an A or A/B impeller. But a C looks kind of small.
Sleeper CP
PLACECRAFT20
07-23-2007, 02:30 PM
Im thinkin A but what the hell do I know
Goad
07-23-2007, 02:43 PM
im running a 350 SBC in a 16ft boat with a B impeller...boat came that way back in '69
but I couldnt tell ya how many rpms im turning
502 JET
07-23-2007, 03:38 PM
It wouldn't hurt to try the B, your boat would probably run faster with it. You may loose a little on the holeshot. You'll turn somewhere in the neighborhood of 500-700 rpm more.
The only concern would be the wear ring sizing and whether they are the same style impeller.
SmokinLowriderSS
07-23-2007, 04:46 PM
What 502 said. You should get about 600 RPM, plus anything extra the increased rpm adds with increased HP. It will likely cost you a bit in holeshot, and you may decide, depending on what type of boating you do, to eventually cut the AA to an A, or maybe an A/B.
If your boat is fairly light, and your load normally is too, you may not notice a great holeshot loss. Just have to try it to see.
BOOGEYMAN
07-23-2007, 09:38 PM
thanks for the input guys!!! My hole shot is incredable now but i wont mind if it goes away a bit, we usually race eachother from a 25-30 mph start anyway! I think I will atleast ry it and see what happens for the weekend!
Thanks again, and any more input is always great as well!!!
Travis.