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What's the advantage??
Posted: Mon Jun 26, 2006 11:44 pm
by ZenArcher
I've seen on some MX5's that the owners have installed a small breather filter to the cam cover breather outputpipe to let hose vent out to the atmosphere and disconnected the hose that connects up to the intake pipe just in front of the throttle body.
What is the advantage in doing this?
I assume that it would stop oil vapour from being breathed back into the combustion process??
Illegal in regards to emissions?
Can anyone shed any light on this?
I was working on my MX5 and the plastic/rubber pipe broke due to being so brittle and I noticed that if I just bloked the intake side, then the idle speed increased.
Posted: Tue Jun 27, 2006 12:18 am
by 93_Clubman
with the bp engine not running i found that the valve in the pipe from near the oil filler cap to the intake crossover pipe only allowed air to be drawn into the engine (as opposed to the pipe with the pcv valve from the opposite cam cover to the intake manifold which only allowed air to be expelled into the manifold).
if this is the same with the engine running, then the filter just allows access to filtered air which would otherwise be drawn from the intake crossover pipe, which when a modified intake pipe is fitted, may not have a the extra pipe fitting the bp throttle body cold start requires.
if this sounds confusing, you're welcome to have a look at my setup which I've modified to accept an NB8 crossover pipe which only has a single pipe fitting.
Re:
Posted: Tue Jun 27, 2006 6:15 pm
by Inf3ct0R
93_Clubman wrote:with the bp engine not running i found that the valve in the pipe from near the oil filler cap to the intake crossover pipe only allowed air to be drawn into the engine (as opposed to the pipe with the pcv valve from the opposite cam cover to the intake manifold which only allowed air to be expelled into the manifold).
if this is the same with the engine running, then the filter just allows access to filtered air which would otherwise be drawn from the intake crossover pipe, which when a modified intake pipe is fitted, may not have a the extra pipe fitting the bp throttle body cold start requires.
if this sounds confusing, you're welcome to have a look at my setup which I've modified to accept an NB8 crossover pipe which only has a single pipe fitting.
NB only has a single fitting?