[C1] PCV Installation
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Army
You have it right.
The threaded part generally goes into a fixture at the base of the carb, the hose nipple end goes into a hose that routes into the rear intake valley hole at the back of the block...this is on typical early small blocks... What year car is involved ?
The threaded part generally goes into a fixture at the base of the carb, the hose nipple end goes into a hose that routes into the rear intake valley hole at the back of the block...this is on typical early small blocks... What year car is involved ?
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Instructor
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From: Lynchburg VA
You have it right.
The threaded part generally goes into a fixture at the base of the carb, the hose nipple end goes into a hose that routes into the rear intake valley hole at the back of the block...this is on typical early small blocks... What year car is involved ?
The threaded part generally goes into a fixture at the base of the carb, the hose nipple end goes into a hose that routes into the rear intake valley hole at the back of the block...this is on typical early small blocks... What year car is involved ?
Late production 61
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Army
Ah. Then you're talking about the RPO-242 California PCV option. What I said applies. If you are going for correctness you'll need the road draft crankcase adapter "bell", gaskets and mounting bolt. Finding the right PCV valve can be a bit of a challenge.
You'll also need the bellhousing right hand spark plug loom as the removed draft tube has that piece welded on ...
Make sure you are running the 'vented' oil fill cap too.
You'll also need the bellhousing right hand spark plug loom as the removed draft tube has that piece welded on ...
Make sure you are running the 'vented' oil fill cap too.
Last edited by Frankie the Fink; Mar 11, 2018 at 07:11 AM.
Thread Starter
Instructor
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From: Lynchburg VA
Ah. Then you're talking about the RPO-242 California PCV option. What I said applies. If you are going for correctness you'll need the road draft crankcase adapter "bell", gaskets and mounting bolt. Finding the right PCV valve can be a bit of a challenge.
You'll also need the bellhousing right hand spark plug loom as the removed draft tube has that piece welded on ...
Make sure you are running the 'vented' oil fill cap too.
You'll also need the bellhousing right hand spark plug loom as the removed draft tube has that piece welded on ...
Make sure you are running the 'vented' oil fill cap too.
Team Owner
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Army
Since you have a dual quad setup, technically the PCV should be hooked to the front carb, but it'll work pretty well in the rear carb too...just an FYI..
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Drifting
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From: Staten island New York
The 63 corvette direction for the flow is reversed , I just hooked my PCV back up on my 61 2x4 setup , had to try a few different PCV valves , The oil fill cap is vented , they do not react the same as say a 1968 corvette/Chevy PCV setup , with closed oil fill ,
to me idle is effected on the 2x4 setup with PCV used ,
But it will stay I pulled apart a fresh 327 standard bore 327 to change pistons last fall and ran that motor with just a draft tube and open oil fill vent for 9000 miles plus . a clean system is better ,
A buddy has a good supply of used old vent adapters FS if you need one !
to me idle is effected on the 2x4 setup with PCV used ,
But it will stay I pulled apart a fresh 327 standard bore 327 to change pistons last fall and ran that motor with just a draft tube and open oil fill vent for 9000 miles plus . a clean system is better ,
A buddy has a good supply of used old vent adapters FS if you need one !
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Army
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I don't have a pic of the proper spout/cap...my car had several incorrect items so I hesitate to use it as an example, I can tell you that the vented cap has slots around the rim on the bottom and has what looks like steel wool stuffed into the cap behind the slots. BTW - these caps need to be thoroughly cleaned out with solvent and air dried every so often - many neglect this maintenance
Need to find a bone stock 62 from Calif. to see for sure.
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Army
Ya....had those for years on my old Chevies, but some vented caps are WIDE and grey with side vents as well, some are black...etc. Does the air flow IN the cap and out the rear vent to the PVC or the other direction? The post above about this is messing with my head. My car had an Offy and Holley on it so I found this intake and it has a closed type of cap with the newer vent hose bung on the side. I just put a filter on a hose for a temp fix.....40 years ago!
Need to find a bone stock 62 from Calif. to see for sure.
Need to find a bone stock 62 from Calif. to see for sure.
No side vents on a vented C1 cap - all the vendors have them BTW. The one I had on my 270hp 61 was silver/gray.
The RPO-242 PCV conversion is an 'open' system - basically meaning vapors do not get routed through the air filter...
This PCV system is easy to understand if you remember the source of vacuum. Its the intake manifold via the carb base.
To wit, intake manifold vacuum causes vapors to be drawn into the system helped by the air flow from the vented oil filler cap, then the vapors and any blowby from the crankcase are sucked through the oil vapor separator can in the lifter valley up through the PCV valve (which meters flow based on engine demands) back DOWN into the intake through the carb to be burned as part of the combustion process.
Last edited by Frankie the Fink; Mar 12, 2018 at 09:09 AM.
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St. Jude Donor '07
Ya....had those for years on my old Chevies, but some vented caps are WIDE and grey with side vents as well, some are black...etc. Does the air flow IN the cap and out the rear vent to the PVC or the other direction? The post above about this is messing with my head. My car had an Offy and Holley on it so I found this intake and it has a closed type of cap with the newer vent hose bung on the side. I just put a filter on a hose for a temp fix.....40 years ago!
Need to find a bone stock 62 from Calif. to see for sure.
Need to find a bone stock 62 from Calif. to see for sure.
on the newer closed tube the air would be sucked from the tube and the fresh air would come in the back
Bill
Last edited by wmf62; Mar 12, 2018 at 09:07 AM.
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I don't know how a 63 got in the mix; they are an anomaly -- ignore those. They are also a 'closed' PCV system which the 61 is not.
No side vents on a vented C1 cap - all the vendors have them BTW. The one I had on my 270hp 61 was silver/gray.
The RPO-242 PCV conversion is an 'open' system - basically meaning vapors do not get routed through the air filter...
This PCV system is easy to understand if you remember the source of vacuum. Its the intake manifold via the carb base.
To wit, intake manifold vacuum causes vapors to be drawn into the system helped by the air flow from the vented oil filler cap, then the vapors and any blowby from the crankcase are sucked through the oil vapor separator can in the lifter valley up through the PCV valve (which meters flow based on engine demands) back DOWN into the intake through the carb to be burned as part of the combustion process.
No side vents on a vented C1 cap - all the vendors have them BTW. The one I had on my 270hp 61 was silver/gray.
The RPO-242 PCV conversion is an 'open' system - basically meaning vapors do not get routed through the air filter...
This PCV system is easy to understand if you remember the source of vacuum. Its the intake manifold via the carb base.
To wit, intake manifold vacuum causes vapors to be drawn into the system helped by the air flow from the vented oil filler cap, then the vapors and any blowby from the crankcase are sucked through the oil vapor separator can in the lifter valley up through the PCV valve (which meters flow based on engine demands) back DOWN into the intake through the carb to be burned as part of the combustion process.