catch can?? don't you need vac. to your block?? a lot of people deny this please clear this up
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catch can?? don't you need vac. to your block?? a lot of people deny this please clear this up
i was just reading searched topics (trying to find out more about a catch can set up). I was also just at my machine shop today and asked the owner about it. he was saying i need this vac pressure that the pcv system allows. the reason it needs it is to do things like seat the piston rings and allow seals to .. well seal. this may not be the case with hondas. so my q is if i were to just put a filter on top of my black box this would allow any pressure to escape given it is more pressure than the ambient air and this would eliminate the pcv and return to the intake mani. my idea is allow the black box to still be installed (to the block) just remove the hose that leaves the box and goes to the pcv valve. however if i do need the vacume to constantly suck air out of the block then i will need a catch can ( i am assuming my black box dosn't cut it) to trap this vapor. i would like to know if anyone has run their car without vac to the block and had any problems??
thanx
if someone already talks about this just post the link please
thanx
if someone already talks about this just post the link please
Honda-Tech Member
Joined: Oct 2007
Posts: 240
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From: pa, us
Re: catch can?? don't you need vac. to your block?? a lot of people deny this please clear this up (
it works whit out vac if you have enough ventalation.
like 4 port on the valve cover and the 2 ports on the back of the black.
like 4 port on the valve cover and the 2 ports on the back of the black.
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Joined: May 2007
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Re: catch can?? don't you need vac. to your block?? a lot of people deny this please clear this up (
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by incredteg3 »</TD></TR><TR><TD CLASS="quote">. he was saying i need this vac pressure that the pcv system allows. the reason it needs it is to do things like seat the piston rings and allow seals to .. well seal.
</TD></TR></TABLE>
Incorrect. The pressure from combustion goes behind the rings and seals them. That's why pistons have the little holes at the compression ring set. It may help with oil consumption, but has nothing to do with ring seal, ultimately. And if this black box you're talking about is anything like the black box on my car, that's for the evaporative emission system, not PCV. Now you can put a vac pump on the engine block to pull the cranckcase down to vacuum a bit, and that helps the pumping losses(like when you open the oil cap when it's running, you get that "exhaust" sound) go away so the engine doesn't have to fight that bit of "pressure" which helps free power somewhat. But thats if you're really squeezing the engine for as much power as you can get out of it.
</TD></TR></TABLE>
Incorrect. The pressure from combustion goes behind the rings and seals them. That's why pistons have the little holes at the compression ring set. It may help with oil consumption, but has nothing to do with ring seal, ultimately. And if this black box you're talking about is anything like the black box on my car, that's for the evaporative emission system, not PCV. Now you can put a vac pump on the engine block to pull the cranckcase down to vacuum a bit, and that helps the pumping losses(like when you open the oil cap when it's running, you get that "exhaust" sound) go away so the engine doesn't have to fight that bit of "pressure" which helps free power somewhat. But thats if you're really squeezing the engine for as much power as you can get out of it.
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