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got prepped bowl pics & impellers too,?

8K views 35 replies 16 participants last post by  sleekcrafter 
#1 ·
race preped bowl pics? anybody got any? i would like to clean the back side up . also 9.25 & 9.50 ,hh etc ,impeller pics, brands etc. thanks.. i might need another impeller. impellers need not be prepped for pic but both will do. thanks ,in advance.
 

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#10 ·
I have one problem with that impeller......it's too nice to be hidden inside a pump. I'd want to have an extra one to hang in the man cave!!!
 
#16 ·
The surface finish isnt nearly as important as getting rid of blunt edges or imperfections. Special files, cut off wheels are key for getting in corners etc. Sharp corners clear to the hub is important on the impellers but dont get carried away, lot of impellers cracking from too much detailing. You can detail a part to the point it will eventually crack and need to be replaced with bigger hp, need to avoid that.

HH stuff already has a nice hub so that part comes in pretty easy where an AMT non HH is alot of work to get a nice hub shape but very worth spending the time to do it.
 
#17 · (Edited)
After testing a few different impellers I went to MPD to get one done for my 21. In it's stock form I had a AA American turbine impeller in my 21 and it ran 112 with my power at 6300 rpm.

After taking that stock impeller and letting MPD go to work on it the boat now runs 115 at 6100 rpm and no cavitation on a holeshot on motor. Haven't tried a nitrous hit on a holeshot yet. So it picked up 3 mph and dropped the rpm 200. Which for my river cruiser is great because it is a heavy boat and I want to spin as little rpm as possible.

AMT will do prep work on an impeller for a extra charge I have yet to see any comparison tests on their impellers vs others.
 
#29 · (Edited)
good question, i was wondering that too. if a stick or the insulator slips out a little & it cavitates like crazy i would believe the air bubbles are being created . rough with waves or ripples in the blade would tend to create a little airation i would think. so i would figure anything you could do to keep airation from happening would help.....anybody know for sure?...props are smooth ,either polished or satin like finish , never rough wavey like a preped impeller,aren't they?
 
#33 ·
What are the typical mile per hour gains from detailing the inducer, impeller, and bowl? My DPS inducer and droop are detailed, but what can be gained from this, or is it for the hardcore racers getting the last little bit of mph outta their hardware? I have the dominator bowl that has the narrow exit hole, and scotty seastrom opened the exit side about an inch and "roughed" in the transition, and it picked up three mph. I wonder if there is more to be had by cleaning up the machining and casting marks?
 
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