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Offline Don R

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puke tank?
« on: March 15, 2023, 08:32:03 PM »
 Tonight, I decided to pre-lube the 836 before trying to start it, I put on the oil tank, poured in a pint, added air to the top and got the oil up to 80psi. Then I opened a rocker cover to check for oil flow. When I did, it released air, I followed the valve cover vent and for sure, it went to the top of the oil tank. I hadn't caught that but should have.

 That leads me to the question what's the popular option for an NHRA legal crankcase oil catch can/puke tank? I'm thinking the jaz one made for jr. Dragsters. It has a K&N style filter in the top. I had one but used it on the transmission of our dragster.  I see them from $8 to $800 online.
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Offline Tracksnblades1

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Re: puke tank?
« Reply #1 on: March 15, 2023, 08:42:15 PM »
Don,
Late model engines have crankcase oil separator/breathers on them. Some have filters in them. The Caterpillar and Cummins type would be way too big and heavy, but a small car may have a usable one. If you’re looking for something that won’t make a mess and will return the captured oil back to the crankcase or tank..?
 
It’s the curiosity and the cat thing…Did the OEM oil tank actually take 80psig ?🤪 Valve cover and bolt threads 😳 80psig..?
 Or are we talking about a real oil primer tank?
« Last Edit: March 15, 2023, 08:49:50 PM by Tracksnblades1 »
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Offline Don R

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Re: puke tank?
« Reply #2 on: March 15, 2023, 09:04:02 PM »
  The oil pressure system was up to 80psi. but not the whole engine. The check valve in the pump must have protected the tank from oil pressure. I have a Schrader valve on the pre-lube tank and it is air over oil so it had a limited amount of air to work with and it took time to move the oil.
  I'd guess the crankcase and dry sump tank had a few pounds. It takes a minute to wrap your brain around something like that even though I've seen it before.
 
  Those billet oil separators for EFI cars are small enough cheap and adaptable. 
 
« Last Edit: March 15, 2023, 09:08:02 PM by Don R »
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Offline Old Scrambler

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Re: puke tank?
« Reply #3 on: March 18, 2023, 12:00:14 PM »
My valve-cover breather extends to a small Gatorade bottle located behind the battery against the rear fender. I've seen custom tanks and old tobacco tins. On these bikes its usually only a little vapor that shows in the catch-can.
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Offline dragracer

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Re: puke tank?
« Reply #4 on: March 19, 2023, 03:49:19 PM »
I used an empty water bottle. I put a barbed fitting in the lid to run my hose into it.
« Last Edit: March 19, 2023, 03:54:22 PM by dragracer »
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Offline dragracer

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Re: puke tank?
« Reply #5 on: March 19, 2023, 03:53:51 PM »
I used a go cart puke tank on the mono shock bike. Got it off ebay
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