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matt167 06-06-2011 11:22 AM

gas powered compressor pump
I do not have 220v and I have a 110v compressor which runs for the most part 'ok'. I can paint with it and for a 110v compressor ( HF 90234 ) it works great.. But I'v had an idea to run a 2cyl compressor pump with a 6.5hp gas engine. I could get a 10 gallon air tank from harbor freight repair parts I think, otherwise, a couple 10 gallon portable air tanks flipped upside down would do..

Where would I get the throttle actuator, or an electric clutch to make it work?

General Martok 06-06-2011 11:33 AM

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oldred 06-06-2011 11:53 AM

You will need a throttle kick-down solenoid and an unloader valve for the pump but be warned these can be a bugger to set up properly. You can use a centrifugal clutch in place of the unloader but honestly the unloader does not cost a lot and works a heck of a lot better than a clutch, which IMO don't work well at all on a compressor. If you are considering just a single stage reed valve pump then a clutch may be your only real option but that setup on only 6 1/2 HP is not going to produce a lot of air.

matt167 06-06-2011 12:38 PM

I was thinking this This and ither the 6.5hp Greyhound or the 13hp Greyhound or the Predator equivlants..

Where would I get the kickdown?

oldred 06-06-2011 01:50 PM

Not sure about that particular pump since they changed them a couple of years ago but the cast iron version of that one was a darn good pump for the price, I know of two of them that have been in service about 3 years and are performing well. For sure you will need the 13 HP to run that one because 6.5 would not be near powerful enough, you need over twice the power rating when using a gas engine vs an electric motor and three times the power rating is not too much!

Just an idea here, how about using an electric clutch controlled by a regular compressor pressure switch? You would still need an electric throttle kick-down and you would need to sync the throttle and clutch but that should be doable. Not sure how the clutch/engine would handle the sudden jolt of engaging such a heavy load as that compressor pump but if you use the unloader valve that's normally used with the pressure switch in conjunction with the tank check valve the the pump would be unloaded when starting, just a thought.

matt167 06-06-2011 02:33 PM

I was thinking about an A/C clutch. being I have the compressor from a '75 Lincoln. But the local small engine shop may have an electric PTO clutch kicking around.. Might possibly use the PTO drive setup from my '68 Sears Suburban 12hp. Just back the mower up till the belt was tight, and run an unloader valve... That reed valve pump would get hot tho

oldred 06-06-2011 03:56 PM

An AC clutch would be way too light but a mower clutch should handle the load.

matt167 11-27-2011 05:04 PM

Well, digging this post out of the grave. HF has there 212cc Predator 6.5 HP's on sale with a coupon for $99.99 and I ordered 1 to at least have that part. I'm also going to use the 2hp rated single cylinder pump instead of the 2 cyl. The extra $200 for the engine large enough for the 2 cyl wasn't worth it

Is This the throttle control I need?

oldred 11-28-2011 07:53 AM

Let us know what you think about the Predator engine, I had one of the Greyhound engines and not only was I constantly having to tighten parts that were working loose but the darn thing sure didn't last very long. It was used on my log splitter and after less than an estimated 35 hours (I am sure the estimate is very close) I thought the pulley was loose on the crankshaft but when I checked it out it was the crankshaft loose in the case! I still don't see how that darn thing was not leaking oil because it should have been pouring out as sloppy as that crank was, I could grab the end of the crank and flop it up and down at least 1/8"! The darn thing went to the scrap recycler and was replaced with a Honda.

What I have been hearing is that the new Predator engine is much better built and every bit an equal to the lower end Honda engines, it has a bearing on the crank output instead of running directly on the Aluminum crankcase housing like the Greyhound.

matt167 11-28-2011 08:37 AM

I'm not too worried. ok, the cam gear is plastic but $99 and I could always put an OEM GX-200 cam in if it broke

Lifan produces genuine Honda parts to ISO-9000 standards.

cobalt327 11-28-2011 10:13 AM

The new engines are 212cc, so I don't know whether they'll be legal for kart racing or not, but they're still rated the same HP so who knows? I got one for my mini bike, so it doesn't matter to me, but for racing I'd want to check.

Word has it the stock flywheels will come apart if used ungoverned. Not a problem if used for a log splitter or compressor, thankfully. Iron cylinder liner and ball bearings on the crank. About as good as it gets for a clone of the Honda. 'Specially for a c-note.

matt167 11-28-2011 10:56 AM

word is there not legal for kart racing, and only 196cc engines remain in class.

Honda flywheels fit and NR racing has them cheap.. I'v also found the cams are not interchangable with any other engines except LCT cams are listed to interchange. NR racing has a stock class cam which is all steel.

cobalt327 11-28-2011 11:10 AM

I should have added that there are both cast iron (cheap) flywheels available as well as aluminum ones (not as cheap). :cool:

cobalt327 11-28-2011 08:05 PM

212cc Predator 6.5HP
The link below has them calling the 212cc Predator 7 HP. They also seem to be a little concerned about using ZDDP because of the flat tappets. Personally I do not thing there's enough spring pressure to worry about it.

Seems that the Predator has different rods, cams, and piston/rings than the Honda GX 200 and clones. The 212 cc Predator has a 70 mm x 55mm B/S, the old engine was 68 mm x 54 mm.

5 reviews are available-

From HERE:

matt167 11-28-2011 09:01 PM

yep, the piston rod and cam as non interchangable is what I have come across also.. dunno where the 7hp comes from. HF lists as a replacement for 6.5hp but doesn't give an official rating in the manual
there are some other pics on 1 of the karting forums.. they actually look quite decent

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