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PCV
Jun 22, 2014 20:38:43 GMT -5
Post by mongoose on Jun 22, 2014 20:38:43 GMT -5
What is the hose size (inside diameter) of the PCV hose? I'm going to try running a PCV instead of just all vented breathers. And speaking of using breathers on the valve covers, and a vented oil filler cap, is there any issue using those and running a PCV valve?
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PCV
Jun 25, 2014 4:57:46 GMT -5
Post by mongoose on Jun 25, 2014 4:57:46 GMT -5
Based on a quick search on Summit, it looks like all the PCV valves have a 3/8" barb on them. I need to pick up a fitting for one of the intake runners to plumb the PCV, and want to make sure I got one with the right size hose barb.
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PCV
Jun 25, 2014 7:03:17 GMT -5
Post by mongoose on Jun 25, 2014 7:03:17 GMT -5
So if I use a port in one of the intake runners as the source for the vacuum for the PCV valve, will I cause the cylinder that is the source for the vacuum (#8) to run lean in comparison to the other cylinders? I have the brake booster feeding off of the base of the carburetor, and I've read that it's not a good idea to tee that source to both the booster and PCV as I may get a momentary lean condition (stumble) when I step on the brake. Not sure how it being tee'd would be any different than running them off of individual sources to cause that condition (could be a bunch of BS).
If it's neither a good idea to use a source on an individual intake runner, nor to share the booster vacuum source with the PCV off the base of the intake, then I could drill and tap the rear of the intake plenum and put a fitting there.
Thoughts?
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Post by Big Mike on Jun 26, 2014 7:52:08 GMT -5
It isn't a great idea to tee a fitting to do two different functions. I'm not familiar with your intake/carb set up but there is usually port on the base of the carb and one on the intake close to the carb. If not it would be super easy to drill and tap a fitting near the carb. That's what I'd do.
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PCV
Jun 28, 2014 6:47:27 GMT -5
Post by mongoose on Jun 28, 2014 6:47:27 GMT -5
I decided to add a couple of new vacuum ports tapped into the intake plenum. I was concerned (maybe overly cautious) that running my PCV off of the #8 intake runner would lead that cylinder to run leaner than the others. And since I tune to run pretty lean overall, I thought that could cause that cylinder to have detonation problems. Also I have used the 3/8" fitting on the back of the Proform carb to provide vacuum to my brake booster. Problem had always been that with a hose connected to it there was zero (maybe less than zero) clearance between the hose and the fuel bowl. To get the hose on or off, I'd have to loosen or remove the fuel bowl. Annoying at best. And I had to be really careful about positioning the bowl and tightening the bolts properly, or I'd have a leak, and have to redo it. So I decided to create two new ports since there is a great location on the backside of the Torker plenum for a couple 1/8" npt 3/8" fittings. Should be a good modification.
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Post by Big Mike on Jun 28, 2014 16:35:11 GMT -5
That's the way to go! Looks good.
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PCV
Aug 2, 2014 12:47:02 GMT -5
Post by Deleted on Aug 2, 2014 12:47:02 GMT -5
I know what you mean about brake stummble. I get some slippage when I'm going real slow, but the brakes are great the rest of the time. Have to look into that later. It can be about number 163 on my list of issues yet to deal with !!
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