I guess I should have been more clear in the video. This is not a *rebuild* of this engine. This video was purely to document the internals and show off the original racing technology used inside a Harley CAC. In the future I will be taking this engine apart again and professionally rebuilding it to put it into a running bike. For now, I just wanted to preserve it to prevent any of the rusty & worn areas from getting any worse. Thanks for the support! ✌️
Thank you so much for documenting and publishing all of these amazing details for us to see. I wish Harley Davidson would do the same thing with their archive of millions of parts and engines.
Nice to see one of these engines apart. It would be interesting to map the cams to see what kind of lift, duration & overlap they ran. BTW, note that the hollow camshafts have some timed breather slots in them as well... for additional crankcase pressure relief. Good video!
Pretty decent video, I just hope that when you or whoever fires that engine up in the future will at least either replace those rusty valve springs or disassemble the valve train and polish the springs then check clearances. Everywhere rust is present on a machined surface it should be addressed if someone intends to swing some real rpm’s with that engine. Even if it’s not one of Petralli’s engines it still holds a lot of historical value. Just hope to hear that it receives the attention it deserves. I appreciate you showing us the tear down and partial inspection, hope to see more.
Thanks for the comment! On this engine the disassembly and reassembly was purely to check out everything inside to see what’s up with the condition and legitimacy of the internals. I will probably be rebuilding this engine and getting it running in a complete bike in a year or so. At that time all the machined surfaces and tolerances will be made perfect 🔥
@@davidlarson3905 Good to hear, hopefully you’ll keep us updated on this engine and the bike that’ll receive it as it’s going on. It’s amazing to see things like this here and knowing they’re in the hands of folks who appreciate them where they’ll be maintained / cared for. Glad you’re here and made this available.
Interesting video David, I found one of the smaller pea shooter over head valve motors on my farm in an old scrap pile, sadly all the internals of the motor are missing.
Hey thanks for the kind words! Sounds like a cool start to a project! You should send me some pictures - I might be able to help you out with it. Email me: Larsonthedrummerboy@gmail.com
Cool vid. Though a remark : rusted valve springs should never be re-used. The pitting caused by corrosion, is an excellent starter of cracks. One customer of mine found out the hard way re-using his mildly corroded springs...... Its a no go. Even touching with bare hands a non lubed spring can already trigger such tiny almost invisible spots.
Why would you polish a cylinder bore? Hone marks provide increased surface area so the oil surface tension can retain the oil on the bore, stopping wear and preventing blow-by.
if you make it squikey clean inside it will get condensation inside of it and RUST ! , never let a engine just sit ,better to run it ever so often common sence
You paid $100,000 for those😮 you don't have anything better to buy with your money, when I was a kid we used to go to a landfill in Summit New Jersey you could find Harley-Davidsons Model A Ford parts brand new in the dump
I guess I should have been more clear in the video. This is not a *rebuild* of this engine. This video was purely to document the internals and show off the original racing technology used inside a Harley CAC. In the future I will be taking this engine apart again and professionally rebuilding it to put it into a running bike. For now, I just wanted to preserve it to prevent any of the rusty & worn areas from getting any worse.
Thanks for the support! ✌️
Thank you so much for documenting and publishing all of these amazing details for us to see. I wish Harley Davidson would do the same thing with their archive of millions of parts and engines.
I especially liked how you scraped it across the metal table instead of using a mat
I noticed that .
I'm not a Harley guy at all but this channel is excellent.
Love these old engines. What a rare find indeed.Great that you showed Billy Lane at the end. His passion for old Harley motors is large.
Nice to see one of these engines apart. It would be interesting to map the cams to see what kind of lift, duration & overlap they ran. BTW, note that the hollow camshafts have some timed breather slots in them as well... for additional crankcase pressure relief. Good video!
I never was into cars and engines but it was pretty cool watching you assemble it and come to life. Well done!
Thanks I appreciate it! 🙌
Damn, a great singer and an awesome mechanic, didn't know that 👍
Very advanced for that time. The rod and rockers are really something along with the double roller bearings on the mains. Thanks.
awesome David, cool video as always... glad we got together at last swap meet in quad cities!!!
Hey thanks Jeremy! It was great seeing you - maybe you guys will have to come down to visit me in the warmth this winter in Florida 🌞😎
Id love to have two,sync'd in line in a frame . What a machine that would be.
the slugs look new , run it !
I know that engine! Very cool video! Thanks for posting.
Hey Dave thanks for the kind words!
great job !!!!!
Looking like a Graveley tractor crankshaft
Hey no prob - signature bond and away he goes😊
Pretty decent video, I just hope that when you or whoever fires that engine up in the future will at least either replace those rusty valve springs or disassemble the valve train and polish the springs then check clearances. Everywhere rust is present on a machined surface it should be addressed if someone intends to swing some real rpm’s with that engine. Even if it’s not one of Petralli’s engines it still holds a lot of historical value. Just hope to hear that it receives the attention it deserves. I appreciate you showing us the tear down and partial inspection, hope to see more.
Thanks for the comment! On this engine the disassembly and reassembly was purely to check out everything inside to see what’s up with the condition and legitimacy of the internals. I will probably be rebuilding this engine and getting it running in a complete bike in a year or so. At that time all the machined surfaces and tolerances will be made perfect 🔥
@@davidlarson3905 Good to hear, hopefully you’ll keep us updated on this engine and the bike that’ll receive it as it’s going on. It’s amazing to see things like this here and knowing they’re in the hands of folks who appreciate them where they’ll be maintained / cared for. Glad you’re here and made this available.
I am surprised that you did not check/document the valve and ignition timing as received. Also, no apparent inspection of the magneto.
The holy grail! Awesome work man 🤙
Thanks man I appreciate it! 🙌
Interesting video David, I found one of the smaller pea shooter over head valve motors on my farm in an old scrap pile, sadly all the internals of the motor are missing.
Hey thanks for the kind words! Sounds like a cool start to a project! You should send me some pictures - I might be able to help you out with it. Email me:
Larsonthedrummerboy@gmail.com
Cool vid.
Though a remark : rusted valve springs should never be re-used. The pitting caused by corrosion, is an excellent starter of cracks.
One customer of mine found out the hard way re-using his mildly corroded springs......
Its a no go.
Even touching with bare hands a non lubed spring can already trigger such tiny almost invisible spots.
No gaskets! do you intend striping it again before fitting to bike ?
Why would you polish a cylinder bore? Hone marks provide increased surface area so the oil surface tension can retain the oil on the bore, stopping wear and preventing blow-by.
Thank You for the devastating video David. But...what does CAC stand for?
What was the spot that looked fractured? Casting marks?
Wonder if that engine can do subharmonics? 🤔
Most engines can 😉
Touché 😆
are you near us
We are in Kissimmee Fl
I doubt they had chrome bores in the 20's.
How many kilogams this engine ? Please .
No new gaskets???
if you make it squikey clean inside it will get condensation inside of it and RUST ! , never let a engine just sit ,better to run it ever so often common sence
i think this engine is more than 700 cc
🎶 "Promo SM"
That hole discovery thing was so Fake!
You paid $100,000 for those😮 you don't have anything better to buy with your money, when I was a kid we used to go to a landfill in Summit New Jersey you could find Harley-Davidsons Model A Ford parts brand new in the dump