Which is the best "Comnoz" breather??

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trous bouches...

I would like to plug and drill at some point but I am glad to share the breather works great even without the trous bouches. I would imagine the greater benefit associated with plugging up is a bit less pumping loss and a bit more juice making it to the rear wheel.

Maybe when I pull it down to skim .040 inch off the head...
 
rvich said:
Hey Jim,
Isn't that top right hand hole in the photo for the wires going into the points cavity?

Russ
Click to expand...

Yes, He had plugged the ignition wire hole also as he was running a crank trigger ignition of some kind. Jim
 
Hi, the pic is from Jean droit ( French speaking CAnadian), and that timing case was dedicated to a magneto model , thus the wire's hole plugged , on a commando you must let it open, otherise you can't pass the ignition stator wires through.........
 
Whitworth Ranch said:
trous bouches...

I would like to plug and drill at some point but I am glad to share the breather works great even without the trous bouches. I would imagine the greater benefit associated with plugging up is a bit less pumping loss and a bit more juice making it to the rear wheel.

Maybe when I pull it down to skim .040 inch off the head...
Click to expand...

Yes, it is good for just a little bit more power and it helps lower the oil consumption.
Drilling the low return hole lowers the temperature of the timing chest quite a bit also. The excess oil in the chest repeatedly running through the gears gets quite hot. That is why the black timing chest seal turns into a rock in 5000 miles. Jim
 
comnoz said:
Whitworth Ranch said:
trous bouches...

I would like to plug and drill at some point but I am glad to share the breather works great even without the trous bouches. I would imagine the greater benefit associated with plugging up is a bit less pumping loss and a bit more juice making it to the rear wheel.

Maybe when I pull it down to skim .040 inch off the head...
Click to expand...

Yes, it is good for just a little bit more power and it helps lower the oil consumption.
Drilling the low return hole lowers the temperature of the timing chest quite a bit also. The excess oil in the chest repeatedly running through the gears gets quite hot. That is why the black timing chest seal turns into a rock in 5000 miles. Jim
Click to expand...

If you keep saying things like this I will be pressurizing my crankcase with compressed air and drilling a hole, particularly after the recent install of a black timing chest seal. The original red one finally gave up.

I do have a nice set of new twist drill bits.
 
comnoz said:
Whitworth Ranch said:
trous bouches...

I would like to plug and drill at some point but I am glad to share the breather works great even without the trous bouches. I would imagine the greater benefit associated with plugging up is a bit less pumping loss and a bit more juice making it to the rear wheel.

Maybe when I pull it down to skim .040 inch off the head...
Click to expand...

Yes, it is good for just a little bit more power and it helps lower the oil consumption.
Drilling the low return hole lowers the temperature of the timing chest quite a bit also. The excess oil in the chest repeatedly running through the gears gets quite hot. That is why the black timing chest seal turns into a rock in 5000 miles. Jim
Click to expand...

Jim, so drilling the lower hole to reduce the oil level in the timing chest is a good thing . Is that true regardless of the other mods?

I was wondering how the lubrication to the timing chest gear and chain bearing surfaces gets there anyway? Is there any deliberate pressure feed? or does it just come through the main bearing? or as an escape from the crank end feed?
 
TS case should get its oil from the dribble down of the intake rocker box down the barrel and into case port that dumps out near oil pump. There's small ~1/4" hole down below oil pump that excess TS oil should drain to crankcase sump then out to the oil tank. Of course could get more if oil pump snout leaking past its seals to pressurize oil feeds. Dont' take much oil to keep cam chain and cog teeth happy but too much oil can heat up the TS case as I learned recently from Colorado Jim. This is what Harley found out trying to supply a whole lot more oil to head to help cool head but instead only got over heated oil that no oil cooler could help so same temp over hot heads, till redesigned some, mostly by better materials in valve stuff. There are two ~1/4" holes in TS the other up by cam.

Shoe eves have finally done what famous for, my oil weeping Trixie after bore scars left over form bad ring gap blow by and inhaled Grit from loose air boots, was dry all over after yesterdays fast fling for a few hours with Wes, who constantly harped on me there was still blow by no one way valve could stay ahead of. i had no smoke from the blow by just Combat mess on cam, but apparently they finally bedding in so no oil puddle in tach drive well or at seam behind barrels on out of head seam, even after topping oil up to show on too short dip stick. Was wondering if I was going to have to buy in on the super duper reed valves necessary to get a clean machine. Nope half fast low grade frowned upon in line PVC is up to it again. Was so bad was considering pulling engine before Lake of the Pines Jim's always shows up at, to put in tread back up in seams, but now may not have too. Will test again over the ton a while to see what shows up or not. Only ran a bit near 80 mph yesterday but easy 30 more mph on tap. I told Wes I get oil smell behind him but not visible yet.
 
Jim, so drilling the lower hole to reduce the oil level in the timing chest is a good thing . Is that true regardless of the other mods?

I was wondering how the lubrication to the timing chest gear and chain bearing surfaces gets there anyway? Is there any deliberate pressure feed? or does it just come through the main bearing? or as an escape from the crank end feed?[/quote]

Yes, I have been redrilling a hole lower in the timing chest before I was doing the other mods. On my racebikes I used to drill as low as I could get directly beneath the main bearing and have never seen any ill effects. Jim
 
comnoz said:
Jim, so drilling the lower hole to reduce the oil level in the timing chest is a good thing . Is that true regardless of the other mods?

Dear Jim,
The lower hole is those in the pic under the oil pump?
How much needs to drill? could you tell me the misurement of the hole.
But if i drill the lower hole, i must close all the other holes like in the pic?.
Please, i have only one standard breather on the left side of the crankcase.
I read this breather do not works wee and is not enough and many fans say to mount another on the blanking plate.
I did not understand what i must to do.
Please, could you kindly explane me.
Best regards.
Ciao.
Piero.
Italy
Click to expand...
 
Hi, Back in the Day, we used to drill and tap a hole for a 3/8 tube fitting in the intake valve cover above the stud and run hose from it back to the oil tank out of sight.
I don't remember any problems doing it that way!
That was on the engines that had the timed breather.

Bruce MacGregor
 
pierodn said:
comnoz said:
Jim, so drilling the lower hole to reduce the oil level in the timing chest is a good thing . Is that true regardless of the other mods?

Dear Jim,
The lower hole is those in the pic under the oil pump?
How much needs to drill? could you tell me the misurement of the hole.
But if i drill the lower hole, i must close all the other holes like in the pic?.
Please, i have only one standard breather on the left side of the crankcase.
I read this breather do not works wee and is not enough and many fans say to mount another on the blanking plate.
I did not understand what i must to do.
Please, could you kindly explane me.
Best regards.
Ciao.
Piero.
Italy
Click to expand...
Click to expand...

Piero,
You can drill the lower oil drainback hole with no other modifications. It will help reduce the amount of oil that gets trapped in the timing chest.
It is 1/4 inch in diameter and is just to the lower left of the oil pump. Make sure you do not drill into one of the existing oil passages.
You do not want to plug any other holes unless you are installing a reed breather that breathes directly from the crankcase-not from the timing chest. Jim
 
Bruce Mac said:
Hi, Back in the Day, we used to drill and tap a hole for a 3/8 tube fitting in the intake valve cover above the stud and run hose from it back to the oil tank out of sight.
I don't remember any problems doing it that way!
That was on the engines that had the timed breather.

Bruce MacGregor
Click to expand...

Except now you had a hole in your cover. :mrgreen:
 
Italy[/quote][/quote]

Piero,
You can drill the lower oil drainback hole with no other modifications. It will help reduce the amount of oil that gets trapped in the timing chest.
It is 1/4 inch in diameter and is just to the lower left of the oil pump. Make sure you do not drill into one of the existing oil passages.
You do not want to plug any other holes unless you are installing a reed breather that breathes directly from the crankcase-not from the timing chest. Jim[/quote]

Dear Jim,
If i understood well, i can drill a hole unde left oil pump about 1/4 inch and o i can fit another standard breather from the blanking plate.
If i understood, i can join the to breather hoses and go together in the oil ank?.
Thanks a lot to you and to everybody.
Ciao.
Piero
 
pierodn said:
Italy
Click to expand...
[/quote]

Piero,
You can drill the lower oil drainback hole with no other modifications. It will help reduce the amount of oil that gets trapped in the timing chest.
It is 1/4 inch in diameter and is just to the lower left of the oil pump. Make sure you do not drill into one of the existing oil passages.
You do not want to plug any other holes unless you are installing a reed breather that breathes directly from the crankcase-not from the timing chest. Jim[/quote]

Dear Jim,
If i understood well, i can drill a hole unde left oil pump about 1/4 inch and o i can fit another standard breather from the blanking plate.
If i understood, i can join the to breather hoses and go together in the oil ank?.
Thanks a lot to you and to everybody.
Ciao.
Piero[/quote]

If you have the camshaft breather (pre-72) then you can just blank off the camshaft timed breather if you want.
 
swooshdave said:
pierodn said:
Italy[/

If you have the camshaft breather (pre-72) then you can just blank off the camshaft timed breather if you want.
Click to expand...
Click to expand...

Please,
Could you explain to me better with more simple words I can't make sense of the translation.
I seem to have realized that having a pre 72 adding a breather to blanking plate should I close the vent crankshaft????
Thank you
Piero
 
Put a one way valve in the blanking plate into the timing chest and put the hose into the top of the oil tank.

Put a bolt in the timed breather on the left side of the crankcase to block it.

Drill a hole below the oil pump into the crank case.

Dave
69S
 
pierodn said:
DogT said:
Put a one way valve in the blanking plate into the timing chest

Dave
69S
Click to expand...

Dear adave,
Can i use the same crankshaft breather?
Ciao
Piero
Click to expand...

Here's one way to do it.

post85701.html?hilit=crankcase

Which is the best "Comnoz" breather??
 
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