Eliminated my breather tube heater
Originally Posted by servion
The oil vapors decrease the effective octane of the fuel, thereby increasing chances of detonation.
Do a little research (from credible sources) before you continue to babble on.
Do a little research (from credible sources) before you continue to babble on.
Originally Posted by hondatech
Nobody's babbling here, what you are saying is wrong. Seriously do you know what detonation is guy? I don't think posting a quote from somebody else makes your theory correct either. Try again, maybe enlighten me by explaining detonation then go into why octane is somehow changed or made less effective by oil vapors....Please use details and explain yourself instead of using someone else's quotes.
I have no idea what detonation is, it's not like I tune other people's cars professionally or anything like that.
Oh wait, yes I do. Here's the last car I tuned (I'll give you a hint: its owned by a respected, long-time member of this board):
91 octane pump gas.
Do you understand what an octane rating is? Its a fuel's ability to resist ignition. Here's where you can really learn about detonation
I'll give you a hint: oil vapors have a lot lower octane rating than fuel. What happens if you mix a lower octane combustible with a higher octane combustible? Say, for example, you decide to mix in 1/2 a tank of 87 octane fuel into your gas tank whish is 1/2 full of c16? The final octane rating of the mixture is significantly lowered.
Boosted Hybrid (Jeff Evans of Evans Tuning) is one of the nation's best EFI tuners.... here's his description of the typical catchcan system (taken from here):
Originally Posted by Boosted Hybrid
The purpose of a catchcan is to "catch" the oil vapors that are typically passed into the intake manifold with the exhaust gas recirculation system on engines. Oil degrates the octane quality of the fuel that you are using. If you can seperate the oil vapors, you can actually run the full amount of octane of the gasoline that you are using and inturn squeeze 1-2 more psi safely from a pump gas setting.
Another aspect of a catch can system is that it relieves crankcase pressure. The freeze plugs in the back of the block are removed, and you vent the crankcase vapor directly from the back of the block instead of forcing it through the stock oil vapor seperator. The key is that you are taking the vapor from two seperate locations on the block, this allows for double the "breathing" of the crankcase thereby relieving more pressure.
Its a two fold system. The filter on the valve cover breather just doesnt let the oil vapor from the head breathing system to pass back into the intake stream. Again, this saturates the incoming air with oil vapor dropping air density and octane level of fuel being used. Its best to have a can "catching" the two locations on the block, and the valve cover breather.
Another aspect of a catch can system is that it relieves crankcase pressure. The freeze plugs in the back of the block are removed, and you vent the crankcase vapor directly from the back of the block instead of forcing it through the stock oil vapor seperator. The key is that you are taking the vapor from two seperate locations on the block, this allows for double the "breathing" of the crankcase thereby relieving more pressure.
Its a two fold system. The filter on the valve cover breather just doesnt let the oil vapor from the head breathing system to pass back into the intake stream. Again, this saturates the incoming air with oil vapor dropping air density and octane level of fuel being used. Its best to have a can "catching" the two locations on the block, and the valve cover breather.
I don't have any problem with members arguing and contending ideas in this forum. It's much more educational because it forces people to think rather than just taking what's said as gospel and becoming a little Honda zergling.
However, the difference between debating what someone has said and being a jackass is how you word what you say. That being said, lets try and keep it friendly and intelligent in here.
However, the difference between debating what someone has said and being a jackass is how you word what you say. That being said, lets try and keep it friendly and intelligent in here.
Originally Posted by hondatech
The air goes from the valve cover into the intake. removing it doesn't give you anything. It's pretty lame that ppl still are doing it and think they are getting anything from it.
Servion thanks again for some great explanations, and you´re right it's very easy to get the wrong info on the net.. and so hard to get the right info
So from my understanding best setup for max. engine (on NA and turbo) is a filter for the head cover and a catch can for the locations on the engine block.
bubye
Originally Posted by PahLok
errrr... I didn´t remove it, I removed the coolant passage near that tube. Read carefully please.
Servion thanks again for some great explanations, and you´re right it's very easy to get the wrong info on the net.. and so hard to get the right info
So from my understanding best setup for max. engine (on NA and turbo) is a filter for the head cover and a catch can for the locations on the engine block.
bubye
Servion thanks again for some great explanations, and you´re right it's very easy to get the wrong info on the net.. and so hard to get the right info
So from my understanding best setup for max. engine (on NA and turbo) is a filter for the head cover and a catch can for the locations on the engine block.
bubye

The wrong info is from Servion.
Last edited by qtiger; Aug 8, 2005 at 11:02 AM.
Originally Posted by hondatech
I really think you are the coolest guy. I just wanted to let you know that, and that I love everyone in this forum... each and every one of you. Edited by qtiger
The wrong info is from Servion.
The wrong info is from Servion.
I suggest that you either post some real-world evidence or at least a solid argument to attempt to prove your point.
Originally Posted by qtiger
I believe he said evidence not experience.
And, for future reference, quoting others is good. Showing another person's argument is also good. It shows that other people think the same way you do.
And, for future reference, quoting others is good. Showing another person's argument is also good. It shows that other people think the same way you do.
I can read thanks, in all my experience(which is vast) I have never seen it happen. And I do not agree with you on quoting others, just because another person agrees or disagrees doesn't mean you are correct or incorrect.Also unrelated dyne sheets and "name dropping" doesn't make you correct either.
I still have not and suspect WILL not ever see prove of his theory that oil vapors will cause detonation.
this is his example:
Originally Posted by servion
I'll give you a hint: oil vapors have a lot lower octane rating than fuel. What happens if you mix a lower octane combustible with a higher octane combustible? Say, for example, you decide to mix in 1/2 a tank of 87 octane fuel into your gas tank whish is 1/2 full of c16? The final octane rating of the mixture is significantly lowered.
Octane reflects a fuel's resistance to ignition. 93 octane is harder to ignite than 87, that's why it is used in high compression engines.
You also directly contradicted yourself in your post. Oil has a low flash point, and thus would tend to ignite in the cylinder before the spark plug fires. Behold, detonation.
You also directly contradicted yourself in your post. Oil has a low flash point, and thus would tend to ignite in the cylinder before the spark plug fires. Behold, detonation.


