Topic: Ever wonder how much oil the CB 750 cam gets ?

[754]

 I have never ever seen this before in 48 years of being around  750,s .
 A guy on Instagram posted a pic of a running 750 with no valve cover on it, and he keeps it running, despite no pipes..
 For those on the Gram, look at this page tommy.sunu     .
 In the video it is spurting up about 4 inches, and he runs it long enough to get about 1/2 quart of oil all over the table..

[HondaMan]

That explains why the inside top of the valve covers are always so clean! Scrubbing bubbles...

[754]

Could you imagine how much oil would come up without the restrictors, it would hit the ceiling. And starve the mains.
 A lot of oil out those 2 tiny holes from that small pump..

[seanbarney41]

Wow, pretty amazing!  Several veritable fountains of oil!

[754]

Bumping this up ,as there is some discussion of the top oiling system..

[ekpent]

Wish I could see the video somehow. See he is running later 1980's carbs also.

[kmb69]

Frank, I can not find the video. Do you have a direct link?

[fxef79]

https://gramho.com/media/2259935462414406121

[754]

Thanks FXEF..
 One thing I just noticed..
 I saw right off the carbs, but today I notice it looks like he made his own manifolds.. maybe welded steel ? Who knows.. and then I thought well you could if you got all 4 spigots out without ruining the thread......  And then I saw a thick bead of silicone on  #2 and I thought he maybe just hammered them in and sealed it.
 I don't think I would want to buy a bike from him..

[scottly]

I suspect that's what happens when you leave the oil restrictors out; that's a lot of oil being flung off the rockers.
Forty years ago, back when I got my bike, I let a buddy do some work on his car in the barn, including setting the hydraulic lifters on a 302 Ford. The oil splash was much less than that, but after dousing the hot headers, suddenly burst into flame with a WHOOMP! We got it out with no damage, but it was an eye opener; neither one of us had considered the flammability of hot oil.   

[PeWe]

Oil specs have flame point specified.
I usually think higher is better without any deep professional knowledge nor tests

[01Thomas]

As an Oil Professional:
The oils' Flash Point Temperature is the temperature at which oil vapors over the liquid (from evaporation) will ignite upon exposure to an ignition source.  A decent synthetic engine oil, say a 0W-30, should have a Flash Point of over 220°C. A decent mineral oil could have a Flash Point of around 200°C.

cheers
Thomas

Oil specs have flame point specified.
I usually think higher is better without any deep professional knowledge nor tests

[754]

 In light of what Scottly said.... and the way this guy treats his  motor, I am wondering if the restrictors are maybe left out...
What do you guys think ? I NEVER SEEN ONE RUN WITH COVER OFF. and it seems like a fair amount of oil.

[Terry in Australia]

Looks a bit suspect, for sure. Now I want Franky to make me a clear plastic cam cover so I can check it on an "un-fcuked with" CB750 engine!

[754]

 So anyone with a test stand we need the test , won't hurt anything, a bit messy .. only has to run 20 seconds. If oil is considerably less , then he left out the jets, maybe blewcthem out and does not know.

[Terry in Australia]

I ran my Suzuki GS 1000 engine with the cam cover off many years ago, and I remember a mist of oil, but they were a low pressure (roller bearing crank) system.  

[scottly]

Looks a bit suspect, for sure. Now I want Franky to make me a clear plastic cam cover so I can check it on an "un-fcuked with" CB750 engine!

Just yank the cover of one of your CBs; you've installed your el cheapo frame kit, so the most you have to loose is a gasket.

[Terry in Australia]

Looks a bit suspect, for sure. Now I want Franky to make me a clear plastic cam cover so I can check it on an "un-fcuked with" CB750 engine!

Just yank the cover of one of your CBs; you've installed your el cheapo frame kit, so the most you have to loose is a gasket.

Actually I've refined the design now Scott, so it's not just a decorative hose clamp like some snake oil salesmen are flogging to the masses, but regardless, I'm too frightened to start my K2 bitsa in case it tries to select two gears at once (or whatever happened last time, when the rear wheel locked up) and I've been too busy with Kawasaki's to get back to it, to check.

I imagine you can remove the cam cover on your Seeley without pulling the engine?

[scottly]

Yeah Terry, I can remove the cam cover on the Seeley, but I have no reason to prove the builder in the video left out the jets by taking something apart that isn't broke. 
BTW, the Frankenscott clamps are much more rigid than a "decorative hose clamp".

[Terry in Australia]

Ha ha, well you won't take yours off, and I'm too scared to start mine, what about Frank? He could whip those clamps offa his bike and take a vid?

[scottly]

It's really pointless Terry. It's clear to me the fuk-witt left the restrictor jets out. 

[754]

I dont have a kit in my bike , but riding with a cut frame. .. btw the frame kits are proven technology, used in a lot of triple trees, and International truck, heavy high way tractors ... to connect the steering wheel to the steering box. So millions in use out there. Do you not trust your triple trees ?

 Now I got to ask you, put a single tube  and clamp in yours, torque to whatever you torque it to, then  pull the end of the tube sideways at a known length.. like say 8 inches.  Now pull it till it moves, then 90 degrees the other way.
 You can sort of record the force with a spring scale.
 I will tell you this.. mine will not move easier..  this I already know.

[754]

 A clear cover won't do it, you have to see if it spurts higher or lower.
 When I saw it I thought, wow that's how much comes out.. then Scott brought up a good point. And looking at what the guy did to carb manifolds, and running it that long with no pipes... nothing will surprise me..

[seanbarney41]

Ok guys, I just went and asked the guy on instagram.  His English is not perfect, but he answered me back when I first commented on his video.

[Terry in Australia]

I dont have a kit in my bike , but riding with a cut frame. .. btw the frame kits are proven technology, used in a lot of triple trees, and International truck, heavy high way tractors ... to connect the steering wheel to the steering box. So millions in use out there. Do you not trust your triple trees ?

 Now I got to ask you, put a single tube  and clamp in yours, torque to whatever you torque it to, then  pull the end of the tube sideways at a known length.. like say 8 inches.  Now pull it till it moves, then 90 degrees the other way.
 You can sort of record the force with a spring scale.
 I will tell you this.. mine will not move easier..  this I already know.

Thanks Frank, you must havec missed the bit where I've completely redesigned mine (don't worry, I won't be selling them, they're too complex and time consuming to make for others,  and anyway, I don' t need the money)

My new ones are all alloy, with threaded "slugs" that fit tightly inside the frame tubes, with tight fitting alloy sleeves on the outside, with screws going from the alloy outer sleeve, through the actual frame rail and
threaded into the solid core within the rail, not just clamping it on the outside, like a big hose clamp.

The good thing is, once again, if a new owner wants to take it back to stock it's easy to disassemble and weld back together, but as it is, it would be the most rigid frame kit, currently available.