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1275, big bore kit, custom build, custom oil tank, lithium ion battery

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  #11  
Old 3rd April 2021
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This is what the transmission vent should like and where it should be laying, free from obstruction.
No tees and no other connections.



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  #12  
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Quote:
Originally Posted by BestCoastXL View Post
My cam vent goes to the custom oil tank as per normal along with a vented brass cap. Is this configuration ok?
Do not vent the oil tank.
Remove the vented cap and put a regular cap there.
The oil tank vent hose goes to the cam chest 90 degree fitting.
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Quote:
Originally Posted by BestCoastXL View Post
The motor stood assembled for a while (several months) before I was able to get to electrical and running oil lines. Am I possibly not being patient enough and maybe just let it run for a bit to see if the lifters pump up?
Possibly. It does take a little while to get oil up to the valves. If it was mine there'd be AN6 fittings / 3/8" ID hoses. No way I'd trust AN4's to allow enough flow.
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  #14  
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Quote:
Originally Posted by Hippysmack View Post
Do not vent the oil tank.
Remove the vented cap and put a regular cap there.
The oil tank vent hose goes to the cam chest 90 degree fitting.
Does having a vented cap on the oil tank really cause that much issue?

I do have the oil tank vent running directly to the cam chest 90, no tees.
But if the oil tank is venting to the cam chest anyways does it really make that big a difference if my oil cap is vented? I used a brass one from bung king.
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What you need to do is return everything (oil / vent lines) back to as stock as possible.
I don't know anything about the fancy DK breather system.
But if you've mismatched some lines on the breathing system or line configuration, that will cause trouble.

A vented cap does not have a one way breather like the heads do.
Due to the crankcase pulses, yes that will make a big difference and cause trouble also.

Sometimes pretty is dangerous.

Need Pics...

The lifters will rattle like Hell for a minute or so but that is all.
Oil pump pressure only takes oil to the lifters.
The lifters take oil to the rocker box.

edit:
Once you get it all percolating right, then you can do whatever routing you want from there.

Last edited by Hippysmack; 3rd April 2021 at 04:38..
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  #16  
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Quote:
Originally Posted by Hippysmack View Post
What you need to do is return everything back to as stock as normal.
I don't know anything about the fancy DK breather system.
But if you've mismatched some lines on the breathing system or line configuration, that will cause trouble.

A vented cap does not have a one way breather like the heads do.
Due to the crankcase pulses, yes that will make a big difference and cause trouble also.

Sometimes pretty is dangerous.

Need Pics...

The lifters will rattle like Hell for a minute or so but that is all.
Oil pump pressure only takes oil to the lifters.
The lifters take oil to the rocker box.
OKay I'll give the sealed cap a go. I can test it by putting a dab of silicone over the pinhole in the cap to cure while I wait for one on order.

As far as the breather goes, it's a pretty simple design. there's a cutaway photo on their site. All it does is route the oily air from the head breather bolts down to a catch can instead of back into the air cleaner.

I checked sportsterpedia for oil line routing and breather line routing. Cam chest to oil tank, got feed and feed and return covered.

For reference, the run of 1/8" is roughly 14" just getting it from the tank to under the motor. I'll have a read on posting pics and figure out how to get them from my phone to my computer and then onto here.








Last edited by BestCoastXL; 3rd April 2021 at 03:45..
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Jesus Christ stay away from silicone!!!..Please
1/2" hose comes off the stock tank for the purpose of draining the oil, then it turns to 3/8" ID hose.
Using smaller ID than that for feed may starve the oil pump.
There is a suction on the pump once it gets going.
But it's not good to restrict the feed line any smaller.

Last edited by Hippysmack; 3rd April 2021 at 05:04..
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Quote:
Originally Posted by BestCoastXL View Post
For reference, the run of 1/8" is roughly 14" just getting it from the tank to under the motor.
I assumed the "1/8"" was a typo. There's no way that's acceptable. That could easily be the cause of your clatter.
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The vented cap allows atmosphere to come into the oil tank, down the vent line and back into the motor.
You don't want extra atmosphere in there as it is designed to have a slight vacuum.
That screws up crankcase pressure.
Doesn't have anything to do with oil pump pressure though.
The lifters normally are about half full on initial startup and they are noisy until fully pumped up.
Noises don't have to have anything to do with the lifters.
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Thanks for the pics.
It looks nice and tidy but that return line looks like it's being pulled too tight with the tie wrap from here.

Can you take a pic of the breather setup.. plumbing wise?
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