PCV Configuration

[Dan D.]

Re: PCV Configuration

Hi Stu,

I remember you posting this a couple of years ago. You are fortunate that you were not injured.

Trying to wake up a sleeping Corvette in 0* weather! I think the car was trying to tell you something. I think it was saying "What are you doing trying to wake me up in this weather"?

But now you have a 100* bandwidth. From 0* to 100* in Florida. That's some dynamic range!

Seriously, I was not aware of this TSB and it apparently is not relevant to FI cars. It sounds like your PCV valve stuck open like you say.

Carbureted and FI PCV systems in 1963 used different hardware, but the top level system design was the same. I don't ever plan on starting the car in cold weather, but I will think about adding a screen in the tube if possible. I have to get the parts first so I can see what I'm up against. Actually, I was thinking about maybe doing this before you posted.

Thanks for the info - and enjoy the up coming winter - I'm not going to enjoy mine.

-Dan-

[Dan D.]

Re: PCV Configuration

Hi Duke.

I remember reading your paper before. I just down-loaded it and printed it out. If I see him again I will give it to him.

I really believe his valves are adjusted wrong. He has a very high idle speed too. The engine just sounded too erratic and loud, too rough running - like it was not happy.

Your older version comes up first in my browser and there are considerable differences in the two versions. If one did not know this, they could be doing it all wrong.

I'm not sure just how you go about removing a post on the internet, or even if you can. The wrong version is tied to the CF forum.

-Dan-

[Duke W.]

Re: PCV Configuration

...helluva story, Stu. This is the first time I have ever heard of an OE Corvette engine having a crankcase explosion, and I wasn't previously aware of that TSB. I've heard of a few over the years, and most were probably on modified engines that didn't have a properly configured PCV system.

In the early days when I was experiencing a lot of backfires due to ignition breakup, I may have been lucky.

Duke

[Duke W.]

Re: PCV Configuration

Hi Duke.

I remember reading your paper before. I just down-loaded it and printed it out. If I see him again I will give it to him.

I really believe his valves are adjusted wrong. He has a very high idle speed too. The engine just sounded too erratic and loud, too rough running - like it was not happy.

Your older version comes up first in my browser and there are considerable differences in the two versions. If one did not know this, they could be doing it all wrong.

I'm not sure just how you go about removing a post on the internet, or even if you can. The wrong version is tied to the CF forum.

-Dan-

After I published the latest version I sent emails to the web administrators that had older versions asking them to replace old version with the latest that I had attached. I never heard back and nothing changed.

You might also suggest that the '64 FI owner check his vacuum advance. It should be a 236 16 or a B28, but does it work? One quick check is to disconnect the signal line and plug it will your finger. Idle revs should drop way off, in fact the engine might even stall. If not the VAC is dead or bubba plugged the line.

I can tell you that John Seeley's '65 FI is running SWEET with .023" cold lash and a properly functioning and connected OE 236 16 VAC. It may take a little experimentation to achieve a decent idle, but it's easy to do since the idle speed and mixture screws are readily accessible without removing the air cleaner, but one thing to remember is that the idle mixture screw is an air bypass so turning it in (CW) is richer and out (CCW) is leaner, which is just the opposite of carburetors.

Duke

[Dan D.]

Re: PCV Configuration

Excellent Duke. I will ask him about the PCV.

Not supprised about the web administrators. Sometimes you just can't move the horse.

-Dan-

[Dan D.]

Re: PCV Configuration

I have bought all the parts to convert to PCV. I have everything installed except the oil tube and clean air line to it. Always one last problem. How does the air tube connect to the oil tube fitting? The fitting is flared out on the end, but not enough to allow the tube to fit in. Is it suppose to fit in, or does it get a piece of hose. I know the other end uses rubber to connect to the air meter adapter.

Aside from this, everything went together fine. That is except for the oil tube. In addition to not understanding the air tube connection, the tube itself is too fat to press into the adapter plate. I can handle this - I will grind it down to get a reasonable press-in.

Getting very close to having it make some noise. Cant wait.

Appreciate some advice.

-Dan-

[Duke W.]

Re: PCV Configuration

...short peice of rubber hose, no clamps, as shown in the '63 AIM. Do you have one?

Duke

[Kent S.]

Re: PCV Configuration

Thought I'd share this picture of how I plumbed a PCV set up on my '57 with the later FI unit. Notice I used the hole in the back of the plenum to achieve fulltime vacuum for the distributor.

[Dan D.]

Re: PCV Configuration

Thank You. No, don't have the 63 AIM. Only have 57. Should get one.

-Dan-

[Dan D.]

Re: PCV Configuration

Very nice Kent, thank you. Just the way I am doing it. No power brakes in 57.

283HP - Eh. Okay

-Dan-