oil catch can

[honda_power]

Hi! I just have one question about oil catch can.We are planning to use yam yzf r6 2003 and we need to use a oil catch can. But, for certain reason, we don't want to return the air in the intake, we just want to dropp it in atmosphere after the treatment of the catch can. Can we do that, or we need to run into the into to keep the vaccuum effect or is just illegal? Sorry for my english! Ottawa U engine team

[honda_power]

Hi! I just have one question about oil catch can.We are planning to use yam yzf r6 2003 and we need to use a oil catch can. But, for certain reason, we don't want to return the air in the intake, we just want to dropp it in atmosphere after the treatment of the catch can. Can we do that, or we need to run into the into to keep the vaccuum effect or is just illegal? Sorry for my english! Ottawa U engine team

[TAMUCC]

The whole reason behind the PCV system is to simply relieve crank case pressure, I do not see why it would hurt to vent to atmosphere, but why even include the catch can? Why not just vent the case straight to the atmosphere?

[honda_power]

Because we have to catch the oil vapor and we are not allowed to just drop it into the atmosphere. Also, the main reason we need to treat the vapor is because the vapor, when she is returned by the pcv sytem into the intake, the drop the octane grade. I wish you catch what i'm trying to explain!

[Bill Kunst]

Honda_power,
Check out these doc's
http://www.dragstuff.com/techarticles/vacuum-pumps.html

http://www.formulasae.org/forums/formula/dispatch.cgi/r...5.1.5%20Catch%20Cans (http://www.formulasae.org/forums/formula/dispatch.cgi/rules/docProfile/100102/d20060122192540/No/3.5.1.5%20Catch%20Cans)

I hope these help in deciding on vacuum or atmosphere vent. Also, you will notice that you have no real decision in using a catch can for oil, Tamucc, when you read the rules.
Bill

[KU_Racing]

Actually Bill, it is very clearly stated in the rules that you must have a catch can on any engine fluid:

3.5.1.5 System Sealing
The engine and transmission must be sealed to prevent leakage. In
addition, separate catch cans must be employed to retain fluids from any
vents for the coolant system or the crankcase or engine lubrication
system. Each can must have a volume of ten (10) percent of the fluid
being contained or 0.9 liter (one U.S. quart), whichever is greater. Any
crankcase or engine lubrication system vent lines routed to the intake
system must be connected upstream of the intake system restrictor.

[Bill Kunst]

KU,
That is what i said. He cannot choose to not run the cans. It is required, and if you click on the links, its right there in the forum post covering that topic. So yes I agree with you, and I think you misunderstood what I said. Thanks for making my reply more clear.
Bill

[TAMUCC]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">I hope these help in deciding on vacuum or atmosphere vent. Also, you will notice that you have no real decision in using a catch can for oil, Tamucc, when you read the rules.
Bill </div></BLOCKQUOTE>
I see now, I must not have caught that section in reading over the rules.

(honda_power) I do not see how recirculating the vapor is going to have an effect on the octane of the engine's fuel.

[Marshall Grice]

oil doesn't have the same octane rating as fuel. which that said, if you are ingesting oil vapor through your intake then you are displacing fuel vapor and lowering your octane rating of the intake charge. So honda power you're on the right track. Plug the vaccum ports on the intake manifold and vent the crank case to atmosphere via a 1 qt catch can.

[Neal Stanley]

Why, don't you route it to the exhaust and gain some HP.
Neal

[TAMUCC]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Neal Stanley:
Why, don't you route it to the exhaust and gain some HP.
Neal </div></BLOCKQUOTE>
That would sort of defeat the purpose of the PCV system, as you would be venting to something above atmospheric pressure...

[Garlic]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by TAMUCC:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Neal Stanley:
Why, don't you route it to the exhaust and gain some HP.
Neal </div></BLOCKQUOTE>
That would sort of defeat the purpose of the PCV system, as you would be venting to something above atmospheric pressure... </div></BLOCKQUOTE>

eau contraire... not if you do it right. This is actually quite common in some types of racing.

[Dan G]

Are exhaust evacuators legal for FSAE? I wanted to try one with the GT12 this summer.

[TAMUCC]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by TAMUCC:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Neal Stanley:
Why, don't you route it to the exhaust and gain some HP.
Neal </div></BLOCKQUOTE>
That would sort of defeat the purpose of the PCV system, as you would be venting to something above atmospheric pressure... </div></BLOCKQUOTE>
please explain further..
article or paper preferably

[nismoplsr]

I dont know if it is legal for FSAE, i dont recall seeing anything in the rules about it at all. But here is what they are talking about. http://www.teglerizer.com/triumphstuff/emissions/emissi...xhaustscavenging.htm (http://www.teglerizer.com/triumphstuff/emissions/emissions_exhaustscavenging.htm)
If you get a vacuume in the cranlcase rather than a pressure you will cut "pumping losses" from the pistons having a pressure behind them, thus freeing up some HP.

[Garlic]

Sure it's legal, though you still have to run a 1 qt catch can in the system somewhere, if it's sealed it would work fine.

[Neal Stanley]

Just so you'll know, from time to time I check this forum for little bits of info. This is the first time I have posted anything. I run in AMOD and have for many years. I really don't pay attention to your rules. But in some types of racing crackcase ventilation is allowed. It will free up some HP. But if not done right the car will smoke at times. I have used an oil/air seperator, using a swirl cup installed in the catch can. I am sure most of you can figure it out.
Neal

[honda_power]

Thank you all of you to help me in that choice!