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Russ Johnson

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Posts posted by Russ Johnson

  2. Posted · Report reply

    Also, spoke with a rep at the manufacturer who said some crap about the reason this surging occurs is because the engines are being made to comply with EPA/emissions regulations.

    Actually, complying with EPA regulations has made a difference over the years. The main jets are smaller so cold running can be a problem. However, after it warms up for a minute or two, it should run properly.

  4. Posted · Report reply

    If choking it a bit smooths it out, the main jet in the carburetor may have debris in it. Was this machine bought from a dealer's stock? Sometimes machines are run when they're received, and if stabilized fuel wasn't used, and the machine sat for a couple of months, you may have a bit of varnish in the carb. If it were me, and the choke smooths it, I'd run a dose of fuel injector cleaner through it and see if it runs better.

  8. Posted · Report reply

    What is the engine rpm at 3/4 WOT you figure Russ J?

    i was told not to run my kohlers under 3000 rpm, for cooling, Hydrulic oil pressure, etc

    The governed rpm is 3,600. This will allow a drop to 3,400 under load. It doesn't require much throttle to maintain 3,600 without a load. Imagine the throttle to run a car at 2,000 rpm sitting in park, then again going up a steep grade. Honda doesn't want the governor to "floor it" just to do its job.

  9. Posted · Report reply

    ....... is (gpm x Psi)/1100 running the gas motor at its upper limit?

    Most dont run engines under tested HP conditions(maximum rpm, good gas , at sea level, not using the charging system, no air filter restriction, 60F inlet air, clean engine oil etc, etc, etc)

    That's exactly it. And the fact that the governor travel is close to 100% WOT. I started building some homeowner type pressure washers years ago using Honda GC engines. I had to take my prototype for Honda testing. It included cylinder temp, oil temp, and governor travel. 3/4 WOT was what Honda deemed acceptable to keep the engine under warranty.

    (WOT = Wide open throttle)

  13. Posted · Report reply

    Russ am I right to assume these are all 1 wire?

    Also with a 1/2 inch hose will it effect the draw rate when downstreaming at longer leangths with 8 gpm?

    Absolutely. Especially at higher volumes like yours. There's a lot less back pressure in a 1/2" hose. Let's say you want to run 200'. Make the first 150' 1/2" hose and the last 50' 3/8" for ease of handling.

  17. Posted · Report reply

    What type of material is used for the plungers on UHP pumps?

    Usually solid stainless steel

    Russ I dont know of any commercial hot water units from the big brand manufacturers that oversizes or have the option to oversize the pumps on their units, is there any?

    Not really. The oversized pumps cost more money, so they stick to the manufacturers' ratings. Larger pumps would cost more money, and you know most shop price.

    I wonder how much more life/less maintenance maybe gained by reducing speed from 1750rpm to say 1000-800 rpm.

    You wouldn't want to slow the pump much, as they are designed to splash a certain amount of oil around in the crankcase at the specified rpms. Slowing the pump too much may cause a lack of proper lubrication. Many of the UHP pumps I've seen have oiler cups on the piston rod so they don't rely on a "splash" lubrication system as much.

  18. Posted · Report reply

    I remember reading that one of the key factors in facilitating an increase in the max pump rating is the diameter of the plunger because of the "forces" acting on it. (Usually smaller bore pumps in the same series of pumps are rated at higher pressures, even more so when the speed is reduced).

    That's true. All the UHP blasters use a small diameter piston (1" - 1 1/2"), but a 4" stroke and 1,000 rpms or less, and pump 20 gpm @20,000 psi.

  20. Posted · Report reply

    Russ, whats the scoop with the different pressure ratings on the 47 series pumps between Italian Interpump (1450 psi max) and US General pump(3500 psi max) for the same speed and gpm in the series?

    Are the pumps mechanically identical?

    Page 30 of the catalog you linked to has the equivalent of the TS2021 (the WS202) that is rated for 2,900 psi. I guess General decided they could sell more by rating it for 3,500? Who knows...but, yes, other than some differences in appearance, the mechanicals are the same.

  21. Posted · Edited by Russ Johnson
    Point of clarification     · Report reply

    Russ J,........ whats the scoop on this pump GT5635

    Legacy seems to be as durable a pump as most.

    Why would general make a pump HP5535 to compete against their own product TS2021 ............is it a North American manufacturing issue? Similar to Honda Japan and Honda USA

    General doesn't MAKE the HP 5535. If you'll notice, the spec sheet that you linked to is for multiple pumps with different ratings. The smallest one, the T1011 is only rated for 2,000 psi @ 1,450 rpm, and only 1,500 psi at 1,750 rpms. Now look down through the parts list. The only parts that vary model to model are the manifold (both are brass, one is nickel plated), and the crankcase cover (one is larger for more oil capacity).

    So, I buy a pallet of T1011's at a lower price and slap a HP5535 sticker on it.

    Just for clarification, I don't relabel the pumps, i buy them like that.

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