CarburetorsCarb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.
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Do you have to run a PCV valve or can you block off the vacuum nipple?
I simply just dont like the looks of it, i have edelbrock elite valve covers, each with only 1 whole in them; i have a oil fill cap on one and a air filter breather on the other.
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:: 383 Stroker bored 60 over :: Double Roller timing chain :: Keith Black 102 Pistons :: Edelbrock Performer Intake & 750cfm carb :: Edelbrock Elite Valve covers and air cleaner :: Chromed out ::
As long as the motor can breathe it will be ok the filter on your valve cover will cover it.
So if thats the case, and everything should be fine regarding the breathing, what do i do with the vacuum nipple on the carb? If i straight up cap it off will that cause any problems with the carb itself or the rest of the vacuum system?
vacuum can increase HP but the pcv is just air flowing through the crankcase. i think the pcv system may increase windage, but thats just my opinion, i have no proof.
For a daily driver, it might keep the emissions.
For a strip car, IDK benifits.
skirkland & the other performance gurus will point you in the right direction!!
the pc system pulls excess crankcase pressure from the engine that builds as it is running. its best to have one. can be run without it. but i wouldnt do it. especially if it is mostly street driven. if it is mostly a race car then it can be done away with.
the pc system pulls excess crankcase pressure from the engine that builds as it is running. its best to have one. can be run without it. but i wouldnt do it. especially if it is mostly street driven. if it is mostly a race car then it can be done away with.
But wont a straight up air filter breather do just fine at letting the crankcase pressure out?
i've been drving my s10 for almost 3 years, every day, avg 20mi., and no problems other than a very very small front seal leak. not sure if its related. i think the pcv system is mostly to keep crankcase vapors out of the atmoshere...AKA emissions......thats my opinion i have no proof other than my own personal experiences. dirt track racers sometimes run very long races and only use breather filters.
i've been drving my s10 for almost 3 years, every day, avg 20mi., and no problems other than a very very small front seal leak. not sure if its related. i think the pcv system is mostly to keep crankcase vapors out of the atmoshere...AKA emissions......thats my opinion i have no proof other than my own personal experiences. dirt track racers sometimes run very long races and only use breather filters.
pressure built inside the engine can cause leaks. and dirt track cars rebuild there engines often. we dont want to.
my oil leak may or may not be from the lack of pcv. i'm just saying if you have some kind of vent you should not have a crankcase pressure-related catastrophic failure.
no not catastrophic failure. just like stated above. acids eroding the engine away over time. a lot quicker than without it. trust me i have seen it within my 23 years in the field.
well, i know until the 2007 diesel emissions standard all/most diesel engines just vented to the atmosphere. if any type of engine would suffer from contaminated oil it would be a diesel engine. you know, 22:1 compression ratio an 30,000 psi fuel pressure at the nozzle tip.
A working PCV system will keep your oil cleaner longer by sucking out harmful fumes before they become harmful oil contaminants, keep the inside of the engine in a negative pressure which can help oil aeration, it helps ring seal and helps to keep various 'problem' gaskets from leaking... like oil pan and valve covers, and it keeps the outside of the motor and engine bay cleaner by keeping away those oil fumes that just 'vent' all over everything.
Its got SO many more benefits than just being an emmitions device... you'd be wise to keep it functional. PCV valve on one valve cover, breather cap on the other. Or be like me, cut a hole in the back of the manifold where it only covers the lifter valley (not into a runner) and put in a grommet and PCV valve, then a breather in each cover. This is basically what GM did on the LT1. Looks much cleaner, and works beautifully.
Or be like me, cut a hole in the back of the manifold where it only covers the lifter valley (not into a runner) and put in a grommet and PCV valve, then a breather in each cover. This is basically what GM did on the LT1. Looks much cleaner, and works beautifully.
Can you take any pictures of this? I guess im just turned off by the looks of the PCV as this is going to be a show car but i am going to drive it so i dont wanna do that much harm to the motor if i could prevent it.
if you're not going to run a pcv valve then you really should run another breather. if not vacuum created on decel will suck in gaskets and cause oil leaks, only one way for air to get in or out. and diesels have a legitimate reason for still running drip tubes, seeing as they have no throttle blades and therefore create no vacuum to operate a pcv system.
__________________ 84 z28-305, performer intake,comp magnum 270, hooker 2460 and dumped 2.5" duals, 600 edelbrock, turbo 350,mini spool.
Can you take any pictures of this? I guess im just turned off by the looks of the PCV as this is going to be a show car but i am going to drive it so i dont wanna do that much harm to the motor if i could prevent it.
This is an intake I did this with a few years back.
Basically none. It just sucks fumes out of the lifter valley, and fresh air comes in through the valve covers - and theres alot bigger 'gap' between the lifter valley and PCV valve with that setup, then there is between the rockers and PCV valve if you put it in the valve cover.
FUMES 
