Run Dry Impleller Thought's???
 

https://www.gcsmarine.com/content/impellers/impellers

A highly respected memeber on another forum stand's right behind these and from what i see would be a very good replacement for OEM stuff so to speak. Any one have experience with this product.

Globe Run-Dry® Impellers

The Only Impellers in the World Guaranteed to Run-Dry for up to 15 Minutes

Time on the water is precious, so trust the most reliable components available. Tests prove that Globe’s Run-Dry® impellers outperform standard neoprene or rubber impellers and are guaranteed to run-dry for up to 15 minutes.

That looks like the hot ticket there as long as it didn't burn up the plastic housing instead. Maybe with a Hardin thingy like this http://www.hardin-marine.com/p-14544...rhaul-kit.aspx it would be ok?

looks good, I think I will order some.

no experience, but market speak usually turns me off, If you take that at face value, it may last 15 seconds to 15 minutes ie: gar, to last UP TO

Any idea what P/N you would use for a 1995 502MPI?

Impellers and housing are cheap. Even if you bought this one is make sure I had spares.

https://www.gcsmarine.com/content/im...eller_by_manuf

The basics, they're as integral to propeller selection as are peformance goals and boat type. Your specifications will help narrow the field.

Pump/Impeller/Engine:

Manufacturer:

Model:

Thanks I didn't see that section! Looks like Diamond Performance has them online $70 but a different p/n than the Globe site comes up with for this application fro Bravo.

Previous oso threads on this... looks like mixed results





http://www.offshoreonly.com/forums/g...-impellor.html

http://www.offshoreonly.com/forums/o...-impellor.html


http://www.offshoreonly.com/forums/g...-burn-out.html

FWIW years ago I remember I think Merc but not 100 % as someone in the industry did a volume water flow test against other aftermarket impellers. OEM Mercruiser Impellers flowed the most, Globe was below those numbers and some of the other aftermarkets impellers were worse at flow rates. I wish I had that info but do not anymore.

The but to this is everything has change as far as who is manu these as well compared to years ago. To bad there is not current testing numbers to see who has the best impeller flow rates for impellers.

I will say this for Volvo penta as Johnson makes their impellers and housings. it seems that a Jabsco impeller installed seems to flow more water and keeps the slightly engine cooler. FWIW.

Also impellers and housings are all about clearances and the correct tolerances to meet the volume / flow rates needed.

Well reading those other threads took the steam out of my sails for these... anyone run the Hardin housing I posted link to earlier though?

I can understand if you have a merc impeller there actually pretty good compared to a volvo...make no mistake volvo impeller's are complete crapola...Hmm yes complete crapola in my humble opinion. Actually the hope here is i get a impeller that wont blow up in a season or two, i do not run a high HP power plant that need's top end performance if you have ever seen a vovlo impleller in its housing you would understand the need for durability.

I used Global for years in motors and generator. Last twice as long.

Soooooo if you ran these dry for 15min what do you think the motor would be like?

You could grill burgers on the risers...... now Im hungry....

All Marine EFI / MPI OEM engines using a 15 mins run dry impeller(s)s are not any better than the guardian mode your engine is going into from not seeing any water pressure and or overheat temps from the water temp sender reading and or the exhaust temp sensors readings.

When the ECM throws the engine into SLOW and or Guardian mode and the engine keeps getting hotter - next is engine shut down and or damage to a certain point.

To further the statement - while running as soon as your engine does not see water pressure - it goes into guardian mode on the spot. Water pressure is monitored in 80 % of EFI / MPI OEM marine engines from 2001 to current. In the past 10 or 11 years it is 100 % monitored and guardian protected. FYI.

i tried the blue ones a long time ago,they did not impress me.they did not move much water at idle and when running hard the water temp was going up.i chit canned them after a few weeks and went back to the merc ones.

I have heard the durometer is not as high as the Merc's and therefor do not create as much flow. Those of us already running on the edge of our cooling capacity might have an issue. I'm running a stainless housing that is hand polished and the Merc impellers seem to hold up pretty well, I also take them out at the end of the season when I winterize so they don't take a set. Going on my third season with the same impeller and I inspect them thoroughly for cracks and wear.

are you saying you remove the impeller before storage and put that same impeller back in the following year?

Have noticed the same, the Jabsco does flow more water then the Johnson & using the Globe run dry and pressures are same as the Mercs we've changed out.

I used the hardin ss body's. From a seat of the pants review. They were very nicely machined. Much easier to work with than the 3 piece merc one. It clearly did take more time to lift water than the mercs. I liked them and they were easy on impellers but they were slightly less efficient in my application.

Interesting, I wonder why the housing would make a difference in the flow assuming it is machined correctly? Are the inlets and outlets different maybe? Just curious as I have no experience with this and can see my 1995 plastic units exploding if I go to service them so was looking for a better option.

Eddie put the housings on and I didn't really look at them, so I really don't know. My engines did not overheat at all. Just noticed a long time from the engine start until water out of the exhaust. Notably different than the mercs. I'm not recommending against them, just honest observation. They very well may flow as much once they get going.

Yes, just checked the condition of my impeller 5 minutes ago. No wear marks although it does have a very slight curve to the blades. The stainless housing is slightly different than the plastic Merc, you can tell by looking at that it won't flow as well. I spent some time on the stainless housing with a die grinder to smooth transitions. I haven't noticed any delays on start up, as near as I can tell I get water out of my exhaust pretty quick and a lot of it.

That's good info on the housing I will keep them in mind still if mine fall apart lol

FYI its no peace of mind to put a used impeller back into the impeller housing at the beginning of the following year no matter what. I am not dogging anyone here but reporting some info as might be unknown by the do it yourselfer. There is no difference in time / labor to install a used impeller compared to installing a new impeller.

The impeller is the heart and the start of of the cooling process. Correct ?

Also lets just say you really could not tell which way the used impeller was spinning after you pulled out. If you put an impeller back into the housing the opposite way that it was spinning - your chances of tearing the vanes (blades) off just went up 500 % that they will fail when back in use. FYI.

Current marine engine cost 20k to ???? and a OEM impeller with a warranty against defects 45 bucks - jeepers I know which way I am spending my money. If you think you are saving money on a very wearable part and at 45 bucks at that - . Just saying .

^ That's a very good point!

This, and I put in a new housing & impeller at the beginning of the season and have put in 2 per season on occasion. Piece of mind is worth more than $80.

Bravo black plastic housings - I will never just change the impeller alone no matter what especially in our area with very low water conditions and not many run sea strainers here in which I can not believe still to this day. Merc gen VII pump (jabsco) here has about a 2 year life span from internal scaring. Yes the Hardin is a good replacement plus repairable- as they use the older style Bravo impeller and the tolerances in their housing are all done for a reason. They are different than the first ones that came out for a reason. You can call them and they will tell U why not change any of that plus have tested it for the results they wanted.

I put in new impeller's and housings every year. It makes no sense to me not to, especially after you already have it torn apart.

Ayuh,..... For those of Us who aren't runnin' Mega-Power boats, just the run of the mill Alphas, Bravos, Volvos, whatevers,...

I've found the Globe impellers are the Greatest thing since sliced bread,.....

I'm runnin' an Alpha 1, 'n it's Globe impeller is pushin' 10 years,....
I'm a Mechanic, 'n I'll keep an eye on it, 'n pull the lower, when I think it's gotta be done,...

With the Merc, or the Sierra black rubber impellers, 3 years was the MAX, period,.....

My ole tin fishin' barge sits at my dock from May to late Oct. maybe early Nov., 'n has for 9 seasons now,....

I can't say how long a Globe impeller lasts,.... ain't replaced a used 1 yet,.....

I had good luck with the Globe as well. Ran one on my stock 454 for over 5 years with no problems. Only reason I took it out was that I was having problems getting water pressure running on the hose after installing the new engine. Problem turned out to be an air leak where the inlet hose attached to the transom assembly. I still have the blue impeller as a spare - it looks perfect other than having a slight set to the vanes. This was run in a boat that saw frequent use in shallow areas with sand bottoms.

I did notice slightly lower water pressure with the globe, and the engine ran a little warmer, but those Merc pumps usually run way more water flow than is usually needed for most engines anyway. Many of us are actually dumping excess water flow overboard.

I read somewhere that Globe had changed manufacturing facilities some time ago and some people were having problems with the hubs tearing out of the impellers. I guess I had one of the "good" ones made at the old facility. That's the main reason I haven't ordered another one. Tempted to put my old one back in and see if it will go another 5 years!