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Post by geoffbbungy2 on Oct 29, 2008 20:18:19 GMT 10
Hi Ron. I remember James operating on the muffler of your Oleo- Mac, (a good point to keep in the memory when using 2 strokes that are slowly dying) - and you also have a very clean carby too. I hadn't had any exposure to the O-M before but when I recieved the performance data sent on by James I have to say that the figures are impressive especially considering the weight (dry) of the new models being only 3.2 kg and a 7db. noise rating which is exceptionally good for a 2 stroke. Problem as I see with the Honda and similar four strokes in the 1" pump range when you check the performance curve and flow tables out carefully is that they tend to be just on the margins of the flow and pressure performance to do a really good job - the better 4 stroke 1" would probably be the Subaru/Aussie Pump combination but that still falls short of the Oleo - Mac where it counts.They are both similar in price($430.00 or thereabouts). I'm about to build a short back packable banjo similar to yours and will select the Oleo - Mac fotr that purpose on the basis of performance ,weight and price. Have you had a try with the alluvial sampler in a good spot yet?Let's know if you want any operating tips as you go along - when you get used to it you should find it very handy for quickly testing out good potential banjo spots. Regards. Geoff/bbungy2.
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Post by jericho on Oct 30, 2008 19:48:26 GMT 10
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Post by robgreaves on Oct 30, 2008 20:55:02 GMT 10
A good resource there... excellent links for pump shoppers.
Surprised to see the Yamaha pump is a 2 stroke though...
Regards, Rob
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Post by geoffbbungy2 on Oct 31, 2008 9:47:25 GMT 10
Hi Jericho. Good post - a lot of useful information wrapped up in one listing.Should be a suitable pump in there for banjo applications within a reasonable distance from water source.Your comment on the Oleo-Mac SC23 is spot on - a high efficiency volute casing without a priming chamber.Pity it doesn't deliver the pressure head similar to a Jessie.Could be quite useful for banjo and sluice applications though where you might want one with some beefed up dimensions which could require more volume than a 1" pump could ever deliver.Priming can be acheived easily by fitting a good quality foot valve.Weight is good for a 1-1/2" pump. Regards. Geoff'/bbungy2.
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Post by prospekta on Oct 31, 2008 18:50:13 GMT 10
Beware some of those pumps are just re-badged(re-coloured) chinese jobs.No different to the car industry.Could be better off on ebay. 2 stroke pumps(even some of the 4's) are a bit of 'luck of the draw' as who knows where they are all made.Once I have my new banjo the Oleo-mac will be my first choice.Mainly because it has no copies and it has been tried and tested.
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Post by geoffbbungy2 on Oct 31, 2008 19:08:35 GMT 10
James. Hi James. I am a recent convert to the Oleo - Mac SA18 (because of the other James) on account of performance and light weight.I was more or less set on a 4stroke preference but none of the 1" 4 strokes have such a good performance curve as the O-M and I can live with 2 strokes if they're good ones.Will build my short version banjo as both a back pack and hand trolley mounted option to cover access to some difficult access areas that I visit so the less weight the better. Regards. Geoff/bbungy2
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Post by Deleted on Oct 31, 2008 20:16:04 GMT 10
Geoff , I dont think that you will go wrong with the OM , they are a great little pump , and only 3.5 kg .I havent had a chance to try the new toy out yet unfortunately but will let you know when I get the chance . Cheers , Ron
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Post by robkiwi1 on Nov 5, 2008 8:54:25 GMT 10
a big problem with the wx10 (ihave about a half doz of them) is if the main pump seal goes on them the water gets into the oil sump and big problems can arrise. i have noticed that the chinese mdels have a gap between the pump and motor housing which is benificial. the wx10 (1.5hp) is a great wee motor but the pump could do with some improving, eg fitting a small jessie pump to it and it would be perfect (or the old keene p80) etc. i love the motor, low noise, light weight and super reliable and efficient but the pump is crap. I have a 2.5 hp 1.5" chinese pump which is awesome but needed a new pump seal original was incorrectly installed. the wx10 occasionally needs new seals after several hundred hours op time.
Rob
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Post by geoffbbungy2 on Nov 5, 2008 14:18:42 GMT 10
Rob. Interesting post - certainly could prove to be an expensive short coming in the design.Is there a witness hole/drain formed or machined in to the housing between the wet end and crankcase? You would normally expect that to be the case.There have been instances where the drain holes in close coupled pump housings have become partially blocked allowing a slightly pressurised leak path back through the engine crankshaft seal in to the crankcase causing oil emuslification with subsequent damage to bearings,crank and piston. A regular check and clean of the drain hole on all close coupled pumps is good practice especially if the drain is on the small side. Regards. Geoff'/bbungy2.
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Post by hennes on Nov 5, 2008 16:36:44 GMT 10
Robkiwi1,I think you are right , it looks as if the seal could leak after some time.Bummer, I have to watch that. Hennes.
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Post by geoffbbungy2 on Nov 7, 2008 10:27:26 GMT 10
Pump prices. If you are considering buying a new pump now might be the time to do so fairly quickly.The price of imports is already starting to go through the roof due to the reduced/ing value of the $Aus. Most of the engines and a lot of the wet ends are imports. Also,be a bit selective where you purchase one too as some of the importers may not be around for a whole lot longer - it is unlikely that the situation is going to change for the better very quickly. Geoff/bbungy2.
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Post by madtuna on Nov 11, 2008 0:21:56 GMT 10
I have a Honda EU generator and I LOVE the quietness and fuel economy. I can run the thing all night and not use a tank of fuel plus not pee off any campers who happen to be near by. Also I don't have to pre mix fuel.
Admittedly I do carry a container of premix for the chainsaw.
Are the benifits above outweighed by the two strokes? I'm looking to purchase a pump too and quite liked Robs WX10
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Post by pickenshovel on Nov 11, 2008 7:23:46 GMT 10
robb , ive got a mate that repairs and cleans water tanks hes been useing honda pumps everyday for years and wont use anything else because hes never had a problem with them. , they are gr8 for what we need them for. steve
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Post by robkiwi1 on Nov 11, 2008 8:23:01 GMT 10
g'day. the honda's dont have a witness hole sadly. i have just rebuilt two wx10s new rings pump seals etc etc, a problem is fine sand can get in between and scour the seal. also i have heard of some people running them dry and burning the seal. overall they are a brilliant pump and are a joy to use i still want to hook one up to the keene p80 (or larger p90).
Rob
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Post by geoffbbungy2 on Nov 11, 2008 8:32:17 GMT 10
madtuna. To buy a pump based on brand and price might not be the best decision one could make ( keep to the better quality ones though).It should be selected on the basis of what volume of water it might deliver and at what pressure relevant to that volume.Don't put too much faith in the advertised figures but get hold of the performance curve and check in what range the pump delivers it's optimum performance for your particular requirement - preferably around 1/2 and no more than2/3 of the max' engine rpm if you want economical and reasonably quiet operation.Also less wear and tear. The small 1" 4 strokes are very good if they fit your performance criteria being relatively economical and have acceptable noise levels - there is also the issue of cleaner exhaust discharge and the convenience of not having to use a fuel/oil mix(don't neglect the crankcase oil level of 4 strokes though as they can chew through some oil if worked hard - most small units don't have a low oil level alert or shut down fitted)).Honda is a good brand but there are others equally as good and probably have better wet(pump) ends than the Honda. I have a spot to work which requires lifting water a few metres above a creek bank so my choice for a new small banjo has been the Oleo-Mac 2 stroke( I wish it was a 4) because it will deliver me the necessary volume and pressure at the spray bars to work efficiently and with good throughput in those situations. A Honda or Yamaha 1" pump would not do the job as well,a Subaru engined Aussie Pump would be a bit more capable.The O-M unit is also lighter than the others at 3.5kg. compared to nearer 6kg .Weight in my case is important as I need to walk quite a long way in and cross several fences to get to some of my favourite spots - then I have to walk out.I have been doing it to date with a larger banjo plus 1-1/2" pump (9Kg. - but it sure delivers the water)and hoses etc. and it's hard work. Not all sluices /banjos are equal - size and design plus how far you have to lift and push water will all influence how much water flow and pressure you wind up with where it counts, so it pays to work things out properly before you spend your "hard earned" and avoid the frustration of marginal (or worse) performance. Geoff/bbungy2.
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