Found PCV valve for modified engine
Thread Starter
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From: Plano TX
Found PCV valve for modified engine
I've been looking for a PCV valve with low flow and a soft spring for my 454. I want the soft spring as with my cam I have less idle vacuum than a stock engine.
I want the low flow because the oil baffles in my aftermarket valve covers are not the best and it is easy to suck oil if the PCV flows too much. Also, my engine is fresh with very little blow-by so I don't need the PCV to flow much anyway.
Went to the parts store and poked around for an hour today and found just the ticket.
My previous PCV valve was all wrong. I forget the application, it was not for a Corvette. It had a soft spring but flowed way to much.
Installed the new one and idle dropped 200 rpm! Now that's a lot less flow!
I think this new one will work great. I'll drive it for a while and see if the oil I found on my plugs goes away.
So for anyone who needs a low-flow, soft spring PCV valve, the application is:
1994-2000 Chevy S10 pickup with 2.2l 4-cyl.
This valve is a direct fit for SBC & BBC.
I want the low flow because the oil baffles in my aftermarket valve covers are not the best and it is easy to suck oil if the PCV flows too much. Also, my engine is fresh with very little blow-by so I don't need the PCV to flow much anyway.
Went to the parts store and poked around for an hour today and found just the ticket.
My previous PCV valve was all wrong. I forget the application, it was not for a Corvette. It had a soft spring but flowed way to much.
Installed the new one and idle dropped 200 rpm! Now that's a lot less flow!
I think this new one will work great. I'll drive it for a while and see if the oil I found on my plugs goes away.
So for anyone who needs a low-flow, soft spring PCV valve, the application is:
1994-2000 Chevy S10 pickup with 2.2l 4-cyl.
This valve is a direct fit for SBC & BBC.
Melting Slicks
Joined: Apr 2001
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From: Lubbock Texas
I just knew mine was wrong. It cross referenced to a Dodge K car! The previous owner built my engine to be roughly the equivalent of the early 70s LT1 engines but he used the cam from the '68 327/350HP engine. My NAPA guy found a valve that was listed for the both '68 and the early 70's LT1s. So far, it has worked for me.
After finding that PCV, I found a reference to this adjustable one on one of the forums. Kinda pricey but might be a good option for some.
http://mewagner.com/?page_id=444
DC
Thread Starter
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From: Plano TX
For the flow rate you look into it from the vacuum hose side. There is a shaft that is the end of the pintle and moves up as vacuum sucks it closed. The air has to flow between the shaft and the housing. Large shaft = low flow.
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JIM
JIM
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Thx zwede, nice to know where to look for big cam engines. I never liked the idea of a controlled vacuum leak to the intake. Ya know all the car mfr engineering just put out bids to 3rd party shops to build the parts to thier specs. Trick would be to find the 3rd party mfr that makes PCV's - most likey overseas these days. PCV's are worse than vacuum canisters for selection.
cardo0
cardo0
Melting Slicks
Joined: Oct 2006
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From: Texas
i found the same issue with my 79, L82 there are 2 different pcv's, hi perf., non hiperf.
they have them at Rockauto.com, even for the 70's,454, there are 2 different pcv's listed hiperf. and non., they do have different rate springs in them..
they have them at Rockauto.com, even for the 70's,454, there are 2 different pcv's listed hiperf. and non., they do have different rate springs in them..
Thread Starter
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From: Plano TX
I was happy to see the PCV valves at Autozone are made by Champion labs in the USA.
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From: Florida
Years ago, when a long line of parts books filled the counters, a friend of mine owned a NAPA store and they had the specs of all the pcv valves. I remember that the pintel inside had a number stamped on the end for the flow. Should have gotten that catalog from him.
From memory, basically, your guess was right, the smaller the engine cid, the less the flow.
Perhaps check on the inlet tube (pass side), to see that you still have vacuum in the crankcase running. at worst, you can duct tape a vacuum gauge to the tube.
From memory, basically, your guess was right, the smaller the engine cid, the less the flow.
Perhaps check on the inlet tube (pass side), to see that you still have vacuum in the crankcase running. at worst, you can duct tape a vacuum gauge to the tube.
Thread Starter
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From: Plano TX
I got some other PCV valves in case this one doesn't work out. Another interesting one is for a Gen II LT1 (application: 1995 Camaro 5.7l V8). This one still has a soft spring but more flow.
Melting Slicks
Joined: Jan 2005
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From: Texas
I know this is an old thread...but I'm having problems with the PCV valve on my ZZ4 sucking oil into the intake.
Are there any results on how this PCV valve worked...or if it took another one...
Did you fix the oil you found on your sparkplugs?
thanks...Stan
Are there any results on how this PCV valve worked...or if it took another one...
Did you fix the oil you found on your sparkplugs?
thanks...Stan
Thread Starter
Race Director
Joined: Sep 1999
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From: Plano TX
Hi Stan,
As so often with these old cars the problem (oil on spark plugs) didn't have a single cause.
For the PCV system I'm still using the same PCV valve. I made a better baffle for my (aftermarket) valve covers. And finally I installed an air/oil separator.
I find very little oil in the separator, so this did fix the issue of sucking oil through the PCV system. But it didn't fix the oily plugs. Looks like most of the oil wasn't from the PCV, but was going past the piston rings and then pushed up into the intake during valve overlap, then back down into the cylinder and onto the spark plugs.
I recently tried some conventional 15W-40 oil instead of the 0W-40 synthetic I usually run, and so far the plugs have stayed clean. But it's too early to tell if they will stay clean long term.
As so often with these old cars the problem (oil on spark plugs) didn't have a single cause.
For the PCV system I'm still using the same PCV valve. I made a better baffle for my (aftermarket) valve covers. And finally I installed an air/oil separator.
I find very little oil in the separator, so this did fix the issue of sucking oil through the PCV system. But it didn't fix the oily plugs. Looks like most of the oil wasn't from the PCV, but was going past the piston rings and then pushed up into the intake during valve overlap, then back down into the cylinder and onto the spark plugs.
I recently tried some conventional 15W-40 oil instead of the 0W-40 synthetic I usually run, and so far the plugs have stayed clean. But it's too early to tell if they will stay clean long term.
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From: Las Vegas - Just stop perpetuating myths please.
Melting Slicks
Joined: Apr 2009
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From: Great Plains Iowa
Hi Stan,
As so often with these old cars the problem (oil on spark plugs) didn't have a single cause.
For the PCV system I'm still using the same PCV valve. I made a better baffle for my (aftermarket) valve covers. And finally I installed an air/oil separator.
I find very little oil in the separator, so this did fix the issue of sucking oil through the PCV system. But it didn't fix the oily plugs. Looks like most of the oil wasn't from the PCV, but was going past the piston rings and then pushed up into the intake during valve overlap, then back down into the cylinder and onto the spark plugs.
I recently tried some conventional 15W-40 oil instead of the 0W-40 synthetic I usually run, and so far the plugs have stayed clean. But it's too early to tell if they will stay clean long term.
As so often with these old cars the problem (oil on spark plugs) didn't have a single cause.
For the PCV system I'm still using the same PCV valve. I made a better baffle for my (aftermarket) valve covers. And finally I installed an air/oil separator.
I find very little oil in the separator, so this did fix the issue of sucking oil through the PCV system. But it didn't fix the oily plugs. Looks like most of the oil wasn't from the PCV, but was going past the piston rings and then pushed up into the intake during valve overlap, then back down into the cylinder and onto the spark plugs.
I recently tried some conventional 15W-40 oil instead of the 0W-40 synthetic I usually run, and so far the plugs have stayed clean. But it's too early to tell if they will stay clean long term.
Over the years I have gotten several sets of aftermarket (Chinese?) rings that didn't have enough oil ring tension and those engines used a lot of oil until I replaced them with Hastings or Perfect Circle rings.
Melting Slicks
Joined: Jan 2005
Posts: 3,022
Likes: 94
From: Texas
Hi Stan,
As so often with these old cars the problem (oil on spark plugs) didn't have a single cause.
For the PCV system I'm still using the same PCV valve. I made a better baffle for my (aftermarket) valve covers. And finally I installed an air/oil separator.
I find very little oil in the separator, so this did fix the issue of sucking oil through the PCV system. But it didn't fix the oily plugs. Looks like most of the oil wasn't from the PCV, but was going past the piston rings and then pushed up into the intake during valve overlap, then back down into the cylinder and onto the spark plugs.
I recently tried some conventional 15W-40 oil instead of the 0W-40 synthetic I usually run, and so far the plugs have stayed clean. But it's too early to tell if they will stay clean long term.
As so often with these old cars the problem (oil on spark plugs) didn't have a single cause.
For the PCV system I'm still using the same PCV valve. I made a better baffle for my (aftermarket) valve covers. And finally I installed an air/oil separator.
I find very little oil in the separator, so this did fix the issue of sucking oil through the PCV system. But it didn't fix the oily plugs. Looks like most of the oil wasn't from the PCV, but was going past the piston rings and then pushed up into the intake during valve overlap, then back down into the cylinder and onto the spark plugs.
I recently tried some conventional 15W-40 oil instead of the 0W-40 synthetic I usually run, and so far the plugs have stayed clean. But it's too early to tell if they will stay clean long term.
10-4, Thank you for the update..
Stan..
Melting Slicks
Joined: Jan 2005
Posts: 3,022
Likes: 94
From: Texas
Theres an adj PCV for $130 if your interested: http://mewagner.com/?page_id=444
I've spent more for less probably.
Is this something you have used?
If so do you think its worth the cost? You seem to be "very" knowledgeable on this subject...
I haven't done anything since yesterday on my car...my back is really bothering me.
I guess I really need a PCV valve...but am not sure what I'll have to do to keep one from sucking oil on my engine.
It looks like the valve cover baffle should have prevented that after I looked at pics of PML's baffle provision
Thanks...Stan
Last edited by Stan's Customs; Mar 12, 2016 at 08:33 AM.
Le Mans Master
Joined: Oct 2002
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From: Las Vegas - Just stop perpetuating myths please.
Hi Cardo..
I've spent more for less probably.
Is this something you have used?
If so do you think its worth the cost? You seem to be "very" knowledgeable on this subject...
I haven't done anything since yesterday on my car...my back is really bothering me.
I guess I really need a PCV valve...but am not sure what I'll have to do to keep one from sucking oil on my engine.
It looks like the valve cover baffle should have prevented that after I looked at pics of PML's baffle provision
Thanks...Stan
I've spent more for less probably.
Is this something you have used?
If so do you think its worth the cost? You seem to be "very" knowledgeable on this subject...
I haven't done anything since yesterday on my car...my back is really bothering me.
I guess I really need a PCV valve...but am not sure what I'll have to do to keep one from sucking oil on my engine.
It looks like the valve cover baffle should have prevented that after I looked at pics of PML's baffle provision
Thanks...Stan
Well no I haven't tried 1 or would I spend that much for PCV vlv. IMHO a PCV dosent need to do much more than keep the crankcase less than atmospheric press.
It's the lack of an iol separator and high vac from the intake that pulls in the oil. All u needvis a jar that u can connect hoses at the top and 1 tube into mid level and u have trap where u can see how much oil is pulled into the intake.
But I suspect good baffling will be your fix. Hope this helps.
Melting Slicks
Joined: Jan 2005
Posts: 3,022
Likes: 94
From: Texas
Well no I haven't tried 1 or would I spend that much for PCV vlv. IMHO a PCV dosent need to do much more than keep the crankcase less than atmospheric press.
It's the lack of an iol separator and high vac from the intake that pulls in the oil. All u needvis a jar that u can connect hoses at the top and 1 tube into mid level and u have trap where u can see how much oil is pulled into the intake.
But I suspect good baffling will be your fix. Hope this helps.
It's the lack of an iol separator and high vac from the intake that pulls in the oil. All u needvis a jar that u can connect hoses at the top and 1 tube into mid level and u have trap where u can see how much oil is pulled into the intake.
But I suspect good baffling will be your fix. Hope this helps.
I sure hope baffling will help too...but forum member "Gen1Corvette" has the same valve covers I do with the same engine I do...with no issues???!
Heres what we have:
http://www.yourcovers.com/valve_covers_11040.php
...and he has 16 in. vacuum, I have 17 in. vacuum.
Thanks again for the help.
Best regards...Stan
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