Old Wayne compressor repower

[Sycan]

I have a Wayne gas powered two stage compressor that I use in my service truck. Running the original Wisconsin single cylinder engine. The engine is getting tired so I bought the 420cc predator engine from HF and put it on this weekend. Since it was out we cleaned it some and gave it a new coat of paint. I didn't do much to the compressor head, but it is still in pretty good shape. Before re-installing it I capped the outlet and timed it to build pressure, 3 minutes from 0 to 175psi. 30 gallon tank. Looking for any calculators online that can compute the CFM , but so far can't find any.

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[mikegt4]

Can't help with the calculations but you did a nice job. You will never lose that tank in the snow! (and now you have a green floor in the garage) Love those old Wayne pumps.

 

[Alchymist]

CFM = [TankGallons X .536 X PSIG] divided by seconds.

PSIG is cutout pressure minus starting pressure.

Example - [30 gal X .536 X 125 PSIG] /167 seconds = 12CFM
Cutout pressure was 125 PSI, starting from 0.

 

[Alchymist]

In your case, 30 X .536 X 175 = 2814. 2814/ 180 =15.63 CFM.

 

[Sycan]

That's awesome, thank you! Compressor is turning 700rpm as the only pulley I could find this weekend was about an inch smaller diameter. Might order up a larger pulley and slow the engine to get 900 rpm on the compressor

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[redmondjp]

That's awesome, thank you! Compressor is turning 700rpm as the only pulley I could find this weekend was about an inch smaller diameter. Might order up a larger pulley and slow the engine to get 900 rpm on the compressor.

Be careful there - what you are suggesting will work, IF the engine can develop the power needed to spin the pump that fast at a given engine RPM. That's why they make HP and torque curves for the engine - so you can answer that question.

 

[Sycan]

Well after a week of using it I have to say the harbor freight engine has been flawless! Normal use I'm running it about 2/3rds speed. Yesterday I had to do brakes on a semi trailer where the lugs were really hammered on and I kicked the engine up to full speed to shorten the recovery time. Several lugs took a couple attemps and most I could get 2 or 3 before air was too low. This with a strong 1"gun. The old wisconsin must have been running about half speed all these years, I wish I would have checked the rpms before I took it off. Plus I used half the gas I would have before. Over all I'm thinking this was a well spent $300, compared to the $2700 Quincey I had been wanting to buy