the blue impeller

[intrepid]

the blue impeller

Hi ----<br /><br /> gotta question about impellers<br /><br /> before I try changing mine in a merc<br /><br /> has anyone seen this?<br /><br /> http://www.globerubberworks.com/marine/impeller/impeller.html <br /><br /> has anyone used one and is it as good as the stock one ?<br /><br />availble in canada ?<br /><br />experince cost ? etc<br /><br /> many thanks

 

[merc 140 pontoon]

Re: the blue impeller

Re: the blue impeller

If there were little downside, I would consider this. My business involves stress analysis and evaluation of materials. I've often wondered why the Merc impeller couldn't be made of a more modern material that wouldn't shred after 10 seconds of running dry. In fact, I had passing thoughts of manufacturing one. Have you found a blue impeller distributor to get a price?<br /><br />Steve

 

[Skinsk]

Re: the blue impeller

Re: the blue impeller

The problem with running the impeller dry, is that you also tend to over heat and melt the housings. I've seen bravo w/p that are brass, but I've also seen the ones that are plastic, with a stainless housing. If the plactic housing melts, then the w/p is shot even if the impeller is still good..<br /><br />The older alpha drives used a completely plastic w/p housing, and w/p base, they melt too.. the new Gen II I think still uses a plastic drive shaft seal holder, which will melt.. <br /><br />Not to mention that 15 minutes of running dry might over heat the motor..<br /><br />Scott..

 

[crazy charlie]

Re: the blue impeller

Re: the blue impeller

My merc mechanic put a blue run dry impeller in one of my previous boats.One crank of the motor WITH water tore the impeller and I had to pull the boat and change it.The mechanic said that was the 3rd one this month that this happened to.I have never had a black impeller fail,just replace it as regular maintenance and DONT RUN IT DRY.Only the old style black impellers for me since then. Charlie

 

[intrepid]

Re: the blue impeller

Re: the blue impeller

that's crazy<br /><br /> we takin bout the same company <br /><br /> they not legite ?

 

[crazy charlie]

Re: the blue impeller

Re: the blue impeller

I dont know the name of the company but it was supposed to be the the greatest thing since sliced bread,a run dry blue impeller.My mechanic has not used them since the incidents.As a matter of fact i dont know anyone that uses them.After what i went through I would never use them or recommend them .Since I had just replaced the impeller with the greatest invention ever "the blue impeller" the LAST thing I looked for when I immediately ran hot was the impeller.That blue piece of crap cost me plenty.Charlie

 

[Capt Ken]

Re: the blue impeller

Re: the blue impeller

Use to be a company back in th 80's called Barco that sold the run dry impeller that was blue. They advertised the heck out of them and I would always see them at the major boat shows. Never knew what happened to them, just haven't heard about them for quite awhile.

 

[Bondo]

Re: the blue impeller

Re: the blue impeller

I've got 1 in my drive.... Put it in this Spring... No Problems yet..... I know it moves Alot of water....<br />I got mine from geo over at boatfix. Don't remember the price....

 

[sloopy]

Re: the blue impeller

Re: the blue impeller

I think the "15 minutes" is for the larger impellers in there blue line! That are run by electric motors to pump liquids into containers and pump out water.

 

[Ralph 123]

Re: the blue impeller

Re: the blue impeller

These guys are really close to me. I know exactly where they are. I often wondered what they were making in that complex. I am going to try to meet with them and get the scoop. If it is for real I'll put some in the Formula and test them and then see if I can rep the line. I'll let you all know what I find out.<br /><br />Looks like a big part of their business is military:<br /><br />

GRW's custom molded urethanes are used for external hydrodynamic shaping and acoustic energy absorption in the SEAWOLF class attack submarines, missile tube sealing gaskets in the TRIDENT class ballistic missile submarines, and propeller bolt covers in the ARLEIGH BURKE class guided missile destroyers. GRW also provides sealants<br />for fuel tanks in the military's helicopters.<br /><br />

CC - I doubt these are the same ones your mechanic used.

 

[Ralph 123]

Re: the blue impeller

Re: the blue impeller

Professional BoatBuilder June/July 1998<br /><br />LONG-LASTING IMPELLERS, EASILY REPLACED<br /><br />By NIGEL CALDER, Contributing Editor<br /><br />Overheating is probably the most common mechanical problem on a marine engine. Most often, it's caused by a loss of raw-water flow that occurs when the raw-water pump impeller fails. Rubber impellers on raw water pumps are typically made of neoprene, which is susceptible to damage from being run dry, and from water contaminated by hydrocarbons, effluent, and other chemicals. Depending on pump and impeller accessibility, replacement can be anything from a speedy process (a few minutes), to a time-consuming exercise in contortionism. The solution to these complaints associated with raw-water pumps is twofold: install impellers that are more tolerant of the kind of abuse experienced in real-life service; and simplify the replacement procedure for an impeller if it does fail.<br /><br />Long-Life Impellers<br /><br />For years, Globe has been manufacturing long-life replacement impellers for most popular marine raw-water pumps. These impellers are made from advanced elastomers, which not only have a greater resistance to chemical degradation than normal impellers, but can also withstand being run dry for 15 minutes. If the engine suffers a loss of its raw-water cooling supply, a Globe impeller unlike a regular impeller will keep on running long enough for the engine-overheat alarm to sound before the impeller is destroyed. In normal service conditions, the Globe impellers have a longer life expectancy, particularly in sandy and silty water than most standard impellers. When they do fail, they tend to crumble rather than having the vanes break off. The small pieces pass through the cooling system instead of plugging the tubing and heat exchanger. Globe's blue impellers are for regular raw-water service (the red, for pumping diesel), and are competitively priced.