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Old 01-07-2012, 05:46 PM   #1
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Oil cap breather?

Getting a cam swap and wondering if this rx catch can and oil cap breather will give the tuner problems? I thought I read somewhere that this breather is okay but I want to find out for sure
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Old 01-07-2012, 05:58 PM   #2
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Essentially, you'll be letting unmetered air into the engine through the crankcase system that hasn't been measured by the MAF...I wouldn't do it.
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Old 01-07-2012, 06:09 PM   #3
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Quote:
Originally Posted by MikeOD View Post
Essentially, you'll be letting unmetered air into the engine through the crankcase system that hasn't been measured by the MAF...I wouldn't do it.
Please research before posting on a topic.

The RX oil breather has a check valve to only allow air out of the crankcase, not in. This helps with positive crankcase ventilation and decreases oil blow by.

If you got an oil breather off of eBay per say, that didn't have a check valve. Then yes you would be letting unmetered air into the crankcase.
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Old 01-07-2012, 06:46 PM   #4
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Thank you Stieger
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Old 01-07-2012, 08:03 PM   #5
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Originally Posted by stieger View Post
Please research before posting on a topic.

The RX oil breather has a check valve to only allow air out of the crankcase, not in. This helps with positive crankcase ventilation and decreases oil blow by.

If you got an oil breather off of eBay per say, that didn't have a check valve. Then yes you would be letting unmetered air into the crankcase.
My mistake, complete missed where he listed a specific brand.

If the check valve is reliable, then yeah, shouldn't affect the tune at all.
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Old 01-07-2012, 10:26 PM   #6
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Okay I don't have to go digging for that tube and stock oil cap. I'll let my tuner know what stieger posted and see what he says.

"The RX oil breather has a check valve to only allow air out of the crankcase, not in. This helps with positive crankcase ventilation and decreases oil blow by. "

Thanks !
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Old 01-07-2012, 10:28 PM   #7
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My mistake, complete missed where he listed a specific brand.

If the check valve is reliable, then yeah, shouldn't affect the tune at all.
No worries. Didn't mean to jump down your throat about it btw, it's just been a rough day.
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Old 01-08-2012, 08:36 AM   #8
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Even if it diid suck air in, how would that affect the tune? It's not like it's going into the combustion chamber. Unmetered air is only bad for the tune if it's using up fuel.

To the OP:
Be sure to check with guys that have it to see if they are getting excessive oily residue all over their engine. I had one for a short while on my old turbo Talon and it would blow oily residue all over everything.
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Old 01-08-2012, 08:56 AM   #9
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It will throw off the A/F ratio thus causing you to pull timing.
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Old 01-08-2012, 08:59 AM   #10
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Quoted from SC2150 himself.

"These breathers have a integrated one way checkvalve that helps prevent any mist escaping from the breather into your engine compartment as well as controls the correct amount of flow into the crankcase unlike a "open" breather."
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Old 01-08-2012, 09:51 AM   #11
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Quote:
Originally Posted by stieger View Post
Please research before posting on a topic.

The RX oil breather has a check valve to only allow air out of the crankcase, not in. This helps with positive crankcase ventilation and decreases oil blow by.

If you got an oil breather off of eBay per say, that didn't have a check valve. Then yes you would be letting unmetered air into the crankcase.
You really do need to follow your own advice!
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Old 01-08-2012, 10:39 AM   #12
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You really do need to follow your own advice!
Haha fair enough. That's my bad for getting it backwards. But either or, the RX oil breather does have a check valve
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Old 01-08-2012, 01:16 PM   #13
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Quote:
Originally Posted by axis View Post
Even if it diid suck air in, how would that affect the tune? It's not like it's going into the combustion chamber. Unmetered air is only bad for the tune if it's using up fuel.

To the OP:
Be sure to check with guys that have it to see if they are getting excessive oily residue all over their engine. I had one for a short while on my old turbo Talon and it would blow oily residue all over everything.
Had mine for 600 miles now and no oil anywhere. Now even on the breather filter.

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Old 01-08-2012, 03:04 PM   #14
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Since you are going to have it tuned, any potential changes to fueling can be adusted. fwiw. I put a breather on my Impala and it threw the fuel trims way off. Someone was supposed to send me the RX breather to test on my Camaro (it's not custom tuned) so I could see if it affected fuel trims, but I've not seen it yet.
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