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Old 11-19-2013, 09:46 PM
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the mythical/magical green impeller

Thought that I would share some info on the mythical/magical green impeller. When I was searching to buy my boat, I had read about these green impellers. So, I always asked the seller if their ballast pumps had the green impellers. Every time they looked at me with a blank face, no idea what I meant. My boat came with a spare, but broken down, Jabsco pump. I repaired the pump which had a used yellow impeller in it. My seller also had a spare brand new yellow impeller. I was bored at work one day, so I started doing some research on the mythical green impeller. I tracked down the product specialist at Jabsco. He told me that both the yellow and green impellers were both made from polyurethane. To his knowledge there was no difference in the impellers besides the color. He said that Jabsco buys the impeller from a vendor. One day that vendor informed Jabsco that the impellers would start coming in green. The Jabsco part number for the impeller didn't change with the color. Per this guy, the green impeller was form, fit, and function the same as the yellow and this is why they kept the same part number.

So, I did a test with my spare pump. I tested a used yellow that was in the old pump, a new yellow, and a new green. (The used yellow was actually still in good shape.) I just attached some black heater hose to the pump and used my truck battery to run the pump. I had two Rubbermaid totes with one filled with 10.5 gallons of water. I ran each impeller forwards and backwards twice, so each impeller had 4 runs to average against. Here are the results.

Used yellow: 57 sec average
New yellow: 59 sec average
New green: 56 sec average

Now, for the engineers in the bunch (which I am one), this was not in anyway a laboratory setting, I will admit. My 13 year old was running the stop watch for me, so there is probably a little error in here.

Conclusion: I really didn't see any significant difference in the fill rate between the yellow and green. Both seemed to prime equally well when the pump was dry. This makes me believe that the Jabsco guy was correct. The Jabsco pumps are rated for 11GPM, so this matched up pretty well with my results of about 10.8GPM. From my calculations, this would fill up a 500 lb ballast tank in 5.7 minutes.

I also measured the new yellow and green impellers with Mitutoyo calipers. The height difference was approximately .001" (negligible). The outside diameter of the yellow impeller was actually larger than the green one. Yellow was 2.015" versus 1.095" for the green (.020" difference).

I have read that the green is supposedly better at preventing the ballast tanks from emptying once filled. I personally don't see how the green would be any better than the yellow on this front. Maybe the green is a different durometer than the yellow. To the touch, I can't tell a difference. I wish I had a way to truly measure the durometer.

Anyway, just some info from someone that had too much free time, which is actually pretty rare for me.
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Old 11-19-2013, 09:53 PM
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I thought the green ones were Nitrile, and the only benefit was they could run longer dry without breaking down? Like if you accidently left a ballast pump running. WakeMakers told me they only sell their pumps with the Nitrile impellors, but mine showed up with the regular ones.

Either way, sounds like they're the same thing in the end, good info.
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Old 11-19-2013, 10:31 PM
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Great post! Thanks for taking the time to test and post results...
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Old 11-19-2013, 10:42 PM
BudmanV24 BudmanV24 is offline
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Whether there is any truth in it at all, I was told that the black impellars were really stiff and pumped quickly, but burned up in no time when ran dry. The yellow was released to prevent smoking the impellars when dry but on the other hand, had issues with allowing water to siphon past the impellar. Then came the green that was supposed to be a balance between the two. All of this is second...well maybe third hand information, so take it with a drop of teak oil.

Or the conspiracy theorist could propose that the entire ordeal has been a marketing campaign to increase sales of impellars. You decide.

Btw, have you heard of the new red impellars?
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Old 11-19-2013, 10:57 PM
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I invented the red ones. They fill your ballast WITHOUT EVEN PUMPING WATER!

But, they squeal really loud, so anyone wanna get on making some purple ones?
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Old 11-19-2013, 11:49 PM
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Albertasurfer - If you pull up the datasheet for the Jabsco pump it has a parts breakdown and gives the part number for the black and yellow impellers. The black one is listed as Nitrile and the Yellow/Green one is listed as polyurethane.

BudmanV24 - Yea, I thought the same thing about the yellow to green being just a marketing ploy. It probably works, change the color and start a buzz about the newest and greatest impeller has just came out. If there was a marketing ploy, I think the impeller vendor or the retailers probably ran that show instead of Jabsco. You can't blame them, really.
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Old 11-20-2013, 12:40 AM
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WakeMakers claims the black and yellow impellers to be discontinued, but still list the green one as a "Premium Upgrade". Seems funny that it's an upgrade if it's the only impeller that Jabsco offers. They sell the green "Premium" one for $26. What were the others worth?
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Old 11-20-2013, 08:45 AM
snork snork is offline
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about half the price for the black ones
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  #9  
Old 11-20-2013, 09:10 AM
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Blackhawk - Your science test seems rock solid.

No clue if there is any difference, yellow to green. All I can add is on my '09 X2, it came with yellow, was having the dreaded siphoning issue, dealer changed them to green under warranty per MC FCO and never had a problem with siphoning after the change.
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Old 11-20-2013, 11:38 AM
BudmanV24 BudmanV24 is offline
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Quote:
Originally Posted by MattsCraft View Post
Blackhawk - Your science test seems rock solid.

No clue if there is any difference, yellow to green. All I can add is on my '09 X2, it came with yellow, was having the dreaded siphoning issue, dealer changed them to green under warranty per MC FCO and never had a problem with siphoning after the change.
I spun/stripped the yellow impellar on the motor spline for my KGB tank. Switched to green and fill time improved dramatically. But, the old impellar was so worn it was nearly void of the ridges or whatever you want to call them at the end of each flappy thing. Yeah, I'm a mechanical engineer....

When surfing my rear tanks equalize due to I assume water siphoning through the pumps. Those yellow impellars are well worn too. I'm going to replace them this winter and if I remember I'll post an update come spring.
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