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Briggs Flathead / Re: parts interchange, V to H shaft engines
« Last post by cycloneracer on October 16, 2020, 10:35:41 AM »
I’m sure factory is set at 3650 for max RPM’s.  I’m going to guess you will have plenty of power to run it at whatever speed you’d like. 

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Briggs Flathead / Re: parts interchange, V to H shaft engines
« Last post by wmartin1 on October 15, 2020, 11:32:51 PM »
Thanks! Speaking of rpms, where might I find a plot of torque/hp for this engine? I'm thinking it would be good to run at the torque peak, which should help with keeping the rpm steady under changing load, as the air pressure comes up. Maybe not a big deal, just thinking out loud a bit.
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Briggs Flathead / Re: parts interchange, V to H shaft engines
« Last post by cycloneracer on October 15, 2020, 07:17:16 PM »
Cool plan!  The old opposed will run a long time if you take care of it and keep the RPM’s low.  The carbs can be a pain but easy to work on.

Good part is that if it ever dies you can bolt in a big OHV single.  Those things are cheap and plentiful.

Post pics when it is done!

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Briggs Flathead / Re: parts interchange, V to H shaft engines
« Last post by wmartin1 on October 15, 2020, 06:00:24 PM »
Thanks for the reply! It is the older opposed twin L-head, as for how to control the compressor action, I have some pressure switches that came with the compressor & tank, the plan is to just pull the throttle with a solenoid when pressure drops to low set point, release throttle when high pressure set point is reached. The engine will be coupled via centrifugal clutch, so no worries about starting or bogging down when off throttle. I totally agree about not wanting to go the gearbox route for coupling engine & compressor, it's just messy. But dollars may outweigh sense here!  I'm an old retired dude, so not about to sink money into something that will be used occasionally if I can help it. The brand new surplus gearbox is $150 + $30 shipping, which may mean that I stick with what I have & know is in good running order. Not to mention I don't see a lot of common part numbers among those old flathead engines...engineers running amuck!
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Briggs Flathead / Re: parts interchange, V to H shaft engines
« Last post by cycloneracer on October 14, 2020, 06:24:16 PM »
Is this an opposed flathead twin or a OHV v-twin? 

I wouldn’t mess with a gear box.    I’d run the horizontal shaft for sure. 

How do you plan on shutting the compressor down when it reaches pressure?   

I wouldn’t mess with piecing together old engine parts if you want it to be reliable.  I’d go get a Harbor Freight Predator v-twin.  They are pretty good engines for the money.  Parts are available if you have issues.  There are even guys building aftermarket upgraded parts for them!!
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Briggs Flathead / parts interchange, V to H shaft engines
« Last post by wmartin1 on October 14, 2020, 04:34:05 PM »
Hi,
New to the forum, just looking for knowledge! Have a good running model 402707 1270 01 9412195B vertical twin, but would be better served with a horizontal shaft motor of similar size. Not racing it, putting on big air compressor to replace 10hp 3-phase motor. I can get a 32hp right angle gearbox for this, but it's just a nicer package with a horizontal shaft engine...just the "right" way to do the job. Now, the question(s): Is it reasonable to look for a horizontal engine carcass & attempt to put my good parts from the vertical shaft in bottom housing from a horizontal engine or is that just a pipe dream? Or should I just look to sell the vertical & buy a decent complete horizontal shaft unit? Actually, I have the complete mower that the vertical is on now, if anybody has trading material & could use that. The gearbox on it is stuck in gear, which is how I came to get this for not a lot of money...on the chance it might be useful.
Thanks for any info/opinions(pls be polite!),
Bill M.
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Briggs Flathead / Re: 42 oppy build governor gear questions
« Last post by cycloneracer on October 13, 2020, 10:12:49 PM »
Plastic won’t fly apart like a metal one would.  I haven’t ever had one fail.  I’ve had several singles that ran over 8k RPM
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Briggs Flathead / Re: 42 oppy build governor gear questions
« Last post by Thejeepkid on October 13, 2020, 05:54:11 PM »
Thank you for the reply now that I’m looking again the gear I was referring is in fact the oil slinger. Will not lie does concern me having a plastic oil slinger supplying oil to the engine would of thought they’d make something like that out of metal
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Briggs Flathead / Re: 42 oppy build governor gear questions
« Last post by cycloneracer on October 13, 2020, 04:46:33 PM »
I’m not familiar with opposes twins.   But every other Briggs uses that plastic gear as the oil slinger.   Pull the Governor parts off of the plastic gear and reinstall 

If removing the Governor you need a billet flywheel.   
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Briggs Flathead / 42 oppy build governor gear questions
« Last post by Thejeepkid on October 13, 2020, 12:22:22 PM »
Hey all, first time building up a 42 oppy. It may be a dumb question but it’s my first time building one of these and I have a decent amount of money into it for it to go boom prematurely. I have the arc rods and precision 212 grind cam. When reassembling do I need to keep the plastic governor gear in place or am I safe to remove that along with its little bracket that’s bolted to the oil pan? If it’s safe to remove it do I need to do anything else to the motor internally or is it just take it off and bolt the pan back on ? Thanks guys
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