7hp Subaru power washer engine

Posts: 18 · Newbie Joined: 13 May 2008 Posts: 18 Pictures: 0

Well I just started gettin ready today for the build. Its goin to be a slow one. I have to get approval from the wife every time I want to "waste" money. [8(] [LOL]

here is the link to my engine pics and the base for the table Im settin up.

[URL=http://i304.photobucket.com/albums/nn161/purepoly/Engine_1.jpg]

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[URL=http://i304.photobucket.com/albums/nn161/purepoly/Engine_2.jpg]

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[URL=http://i304.photobucket.com/albums/nn161/purepoly/NewImage.jpg]

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Posts: 18 · Newbie Joined: 13 May 2008 Posts: 18 Pictures: 0

ok so i just figure out my 7hp Subaru is the same as a 7hp Robin. The Robin EX-21 is conservatively rated: 7.0HP @ 4000rpm AND 10.26FT*LBS TORQUE @2500rpm. Anyone know of any performance mods?

more info here:

http://www.key-ideas.com/Robin-EX-Engine-Swap.htm

http://www.robinamerica.com/specsheet.aspx?pid=9

Posts: 18 · Newbie Joined: 13 May 2008 Posts: 18 Pictures: 0

Ive emailed a few shops that say they will have some power mods available by the end of summer for these engines.

Posts: 18 · Newbie Joined: 13 May 2008 Posts: 18 Pictures: 0

Link to an exhaust kit for the Ex series engines.

http://www.robertsonstorquetubes.com/products_subaru.htm#subaruSRCC

I will post pics of my air box mod as soon as the glue dries.

the engine runs way better already

Posts: 18 · Newbie Joined: 13 May 2008 Posts: 18 Pictures: 0

do you guys think this muffler would work well on the Subi?

http://www.jegs.com/i/Patriot%20Exhaust/737/H3010/10002/-1

Posts: 33 · Bronze Member Joined: 23 Jul 2007 Posts: 33 Pictures: 0

That thing has a 2" inlet and outlet!
Way to big.
I would leave that engine bone stock, and instead of spending money on mods save up and buy a larger engine.
Ebay is your friend, there is tons of small engine parts on it.

Posts: 1832

I definetly recommend you leave the motor bone stock! Remember this is a learning project for you so "Keep It Simple"!
You can go all out on the next one Wink

Posts: 18 · Newbie Joined: 13 May 2008 Posts: 18 Pictures: 0

Engine is already tuned up. I am goin with this exhaust.

http://www.robertsonstorquetubes.com/products_subaru.htm#subaruSRCC

I have already upped the rpm but still have a throttle stop on it so it doesnt blow.

Opend up the air box
Amsoil 10w30 full synthetic
cleaned the carb
cleaned and re gapped the plug

runs like a champ now. no more stumble or hesitation. Very crisp throttle response. With the Amsoil oil it seems to rev faster too.

Goin to start gathering parts for the build now as time/wife allows.