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MJ wrote:

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We added electric start to our Honda, I would not fight a pull cord for the 200.00 it cost us, when you are starting it 5-10 times a day, it will makes you attitude better.

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 Our 13 hp Honda Bel Air Comprssor has an unloader, and starts with one good pull, but you need to put some ass into it, LOL

My Eaton came with an electric start. Am going to have it hard wired so no to have to worry about a battery.

ShingleMD wrote:

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Bigger is always better , but not always necessary . This picture (if it comes up) is a sealcoat spray system , it uses an 1 1/2 inch dual diaphram air pump . The wheelbarrow compresser keeps up with these spraying sealer all day . I have sprayed 500 gallons basically non stop on large lots.  5 hp is more than sufficent .  It would hold a constant 60 psi all day .

Had I known 15 years ago that they made the AD pumps for chemicals I would have been using one earlier . I didnt want to tear up a sealcoat pump .

 

 

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 It is just like a woofer, or an automobile engine, Bore times Stroke equals displacement. The big BORE of the 1 1/2 inch pump requires LESS air to displace a given amount of fluid.

If you watch an 8 inch woofer making bass, it must move like crazy, and  eats lots of power. But a 15 inch woofer hardly moves, to make the same amount of bass, and requires less power to do so.

Now, if you REALLY want to make bass, you get a 15 inch woofer, and feed it Lots of Power 

Same with a pump, you get a pump, and feed it lots of air. Air to a pump is like watts of power to a woofer, the more power, the more displacement, until mechanical excursion limits are reached.

Your sealcoat 1 1/2 inch pump may have had "enough" air to do the job. But IF you used a larger nozzle, and a bigger air compressor, the pump would spray faster.

Of course, this may not be what was wanted.

The needs of a roof cleaning pump are different from a sealer pump, I think.

For one, we are often spraying UP, not down flat, and sometimes we are 40 feet up on a roof w/300 feet of hose.

Often, we must call on our roof cleaning pumps to shoot 30 to 50 feet, often into the wind, and from 40 foot ladders, with liquid running through 300 feet of hose.