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1942 B/S Z powered air compressor


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#1 jimmy G ONLINE  

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Posted August 19, 2017 - 02:16 PM

Might run with a points cleaning, spun it over till gas ran out the carb and didn't hit and that's all the time i could put in to it at the moment, direct drive and no decompression on the pump means spinning it gets old quick lol, back to square one though on the difference between a Z and a ZZ as this has the bigger fine threaded intake, maybe a crossover with smaller carb

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#2 Bruce Dorsi OFFLINE  

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Posted August 19, 2017 - 05:01 PM

To make things easier, remove the belts from the compressor until you get the engine running well.


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#3 jimmy G ONLINE  

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Posted August 19, 2017 - 10:51 PM

That's a good idea Bruce,but the engine is not staying, girlfriend wants me to put it on her chain steer lol, the block appears to be blanked for the application, I know from your post's you are quite knowledgeable soooo you wouldnt know the difference between the Z's by chance

#4 Bruce Dorsi OFFLINE  

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Posted August 20, 2017 - 07:20 AM

I may be old, but these engines are before my time!  :D   ...I have little knowledge on these engines, but here is what I learned from the B&S Repair Manual and a 'net source.

 

The Z's & ZZ's were produced 1931 to 1949.  ....B&S info lumps them together, so I don't know if all models were produced at the same time, or if the ZZ replaced the Z.  ...Horsepower ratings were 4 to 6hp, probably dependent on rpm settings.

 

There were 18 model variations of the Z.  ....There were 5 model variations of ZZ.   ...Some were aluminum blocks, most were cast-iron.

 

All Z's and ZZ's up to Serial # 292883 had oil pumps.  ....ZZ's after Serial # 292883 had a splash oil system (dipper on connecting rod).

 

The PTO journal on the ZZ's crankshaft was larger than the Z's. (This according to the Repair manual, but the Crankshaft manual indicates they were all the same diameter.)

 

The cam lobes on the ZZ's were larger diameter than the Z's.

 

All Z's and ZZ's had a 3" bore x 3-1/4" stroke from the factory.

 

Valve clearances for the Z's is shown as INTAKE .007"-.009"   EXHAUST .014"-.016"

 

Valve clearances for the ZZ's is shown as INTAKE .019"-.021"   EXHAUST .017"-.019"

 

I can not vouch for the accuracy of this info, as old B&S info is not always 100% accurate.


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#5 jimmy G ONLINE  

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Posted August 20, 2017 - 07:06 PM

[quote name="Bruce Dorsi" post="788139"

The cam lobes on the ZZ's were larger diameter than the Z's. [/quote] I've been comparing part no.s but haven't the cam(will frist chance i get, this stuff gets stuck in my head), the later Z has the same intake elbow 61976 part no. as the ZZ so I'm thinking the later Z is capable of the higher HP., was thinking the valve clearance difference was a tec. update because the valves are same and wasn't thinking lift, thanks for pointing out this oversight

Edited by jimmy G, August 20, 2017 - 07:08 PM.


#6 jimmy G ONLINE  

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Posted August 20, 2017 - 07:12 PM

Dang it, that was supposed to be a quote,the more i tried to fix it the worse it got lol

#7 jimmy G ONLINE  

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Posted August 20, 2017 - 10:46 PM

The cam lobes on the ZZ's were larger diameter than the Z's.

thanks Bruce, the part no.s are different on the cam and lifters, the difference between a late Z and a ZZ is the cam




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