I run 7 honda gx390 with 5.5 @ 2900psi and have zero issue at all with them, Anything over 5.5 i would go to a honda GX690. My motors last on average 2 years before we replace and they work 5 days per week 50 weeks per year.
2 Likes
Yeah but are you actually getting 5.5GPM @ 2900 psi? have you measured it?
sure am tested every monday, When you run as many rigs as me everything MUST be tested and any drops in flow or pressure is always investigated asap as its a sign of a bigger problem, Plus i ONLY run reduction gear boxs, No belt drives for me, way to must variants in belt slip, belt stretch.
What? You test your flow every week? with a bucket and a stop watch?
close, first we mounted the pump to a GX690 to ensure power was not a factor, measured the flow into a drum on scales, did that 3 times to get a base line. You only have to do that once to get your base line, re mounted the pump onto its normal motor, and did the same and do the same with all rigs each monday when we do our full rig inspections, Each GX390 flows the same weight of water within a few percent as the GX690. also to remember dont use a standard bucket as it will overflow , we cut the top of a 100lt chem drum and use that. Hope that makes sense
Also remember we replace all motors at 2 years regardless, as they get old they do loose some power and any loss in power on a GX390 will effect your flow and pressure, we can sell a 2 year old GX390 for $250 and we buy them brand new for $850 so its worth always having new motors to us. Down time is way to expensive
Without getting to lengthy, basically ignore all the Carl said and you will be fine. Your motor has nothing to do with the ability to downstream. I don’t think he has the concept of how gas engines work.
3 Likes
yeah i read it again… ive been trumped
1 Like
No Carl read it again, you only swap to the GX690 to get a base flow rate than swap back to the GX390 and the flow rate from the GX390 should be the same as the GX690. that shows no loss in flow, pretty sure that what i wrote
all good mate, hope it helps
I am not doubting that that a GX390 can make 5.5 @ 3K, but it has to working that motor hard.
I cannot find a retailer that sell that configuration, They have larger motors when going to 5.5GPM.
If this configuration is “standard” why have the manufactures put GX690’s on the units. I thinks its because of durability,
So is it better to buy a GX390, 5.5 GPM @ 3k replace it every 2 years?
or buy a GX690, 5.5 GPM @ 3k and replace it every 4 years?
Someone has to be on my side, with the durability argument.
They should have setup the machine to run at 2500psi. And they should have offered to reconfigure it when questioned about it. 3kpsi is asking a lot from the little Honda.
The Eagle series 5.6@2500 belt drive from pressure pro is a very popular machine. It uses a gx390.
As to why it’s not pulling soap, you’ll have to explore everything- even the basics:
- Is the injector pointing the right way (there’s an arrow on it)?
- Is the strainer at the end of the draw tube clogged?
- Is there too much back pressure on your hose? You are using low pressure tips, right? You should be running size 40 tips for your machine.
- how much high pressure hose are you using?
- are there too many plumbing restrictions after the injector, like elbows and whacky bypass setups?
Sorry to be curt but I was typing on my little phone. True all the pressure pro vendors here lie some with regards to their specs. But, a gas engine is only going to produce what is going to produce. It is going to dig deep, take one for the team, and give more output and die early. It is going to produce what it is designed for and nothing more. End result, all those guys that think they are getting 8 gpm 3500 psi on their pressure pros are getting like 7 at 3000psi but it’s negligible in the long run and the motors are wearing out any faster. My rule of thumb has been replace a Honda every every 3K hours and the udor pump every 6k hours. Both may have life in them but not worth the chance of losing time out of state somewhere. I’ve got a have dozen 690’s on the shelf that become parts, project motors or craigslist items. Most of questions about drawing soap were answered but it has nothing to do with engine size.
1 Like
They purposely targeted this machine to sell to me since I had mentioned that I wanted a larger GPm but couldn’t afford it at the moment.
Would dialing itt back like this cause me to lose some distance when rinsing or not able to do concrete with my surface cleaner? I don’t do much surface work so that’s not a huge deal. But I do get about 40’ of reach when rinsing houses.
I totally agree with you. I want a machine to last as long as possible.
Thank all you guys for your input. I’ve learned quit a bit from this thread. I may consider just upgrading my motor to a 630 or even a 690. I plan on upgrading to an 8gpm at some point but I still want this machine I have now to last as long as possible.
@Innocentbystander I never claimed the motor had anything to do with the injectors. I only claimed that any engine would drive a pump to produce a flow, which should pull a vacuum in the injection line. Again I dont use injection or claim to know anything about them.
“But, a gas engine is only going to produce what is going to produce. It is going to dig deep, take one for the team, and give more output and die early.” Innocentbystander
I dont understand how you can say its going to produce what its going to produce and say that its going to give more output, But i think where all taking about the same thing. “its physics: 13HP can only move so much water. if you ask more of it, its not going to put out anymore,” Carl
@KNBExteriors, innocentbystander agreed with me, its going to die early. The guys who run this set-up have already said they change them every 2 years.
William, just to clarify, did you mean to say that the motor isn’t going to ‘take one for the team’, and that the motors aren’t wearing out any faster?
1 Like
