Its actually GM that makes the recommendation and it hasn't got anything to do with oil consumption. They made the recommendation to reduce the chance of starving the bearings in long high G corners where the oil can move away from the pickup. An engine that is topped off to the full level can experience bearing starvation.

Bill

 

My 98 has an oiling problem as well---I installed a LS6 pcv valley and new pcv set-up--also intalled an AMW catch can--Next I tried putting a vented oil cap-2 k&n small type breathers--one on each valve cover--all this helps some--but after 3000 miles of normal "corvette" driving--the intake manifold was what I would call horrible---It's a wonder these dam LS1's run at all !!!! Exagerating a bit but really it is a huge issue--I'm sure the combustion chamber and synthetic oil aren't the best of friends---I'm lost at what to try next--the coalesing filter seems to be promising--thks for that info--gonna set one up and try it-

 

Hi guys, you've all been a big help to me and I was hoping for some more. This talk about catch cans is very interesting and I have been wondering if this condition about blow-by contaminating the throttle body is on all vettes or only certain year models? I have a 2004 and I am wondering now if maybe the catch-can is the 2nd thing that I should get, the 1st, being the Borla Stingers that I put on. What do you guys think? Thanks again............bob.

 

Dave68, with that fine a filter, does it load up with oil and restrict flow, or does the oil drip into the bowl fast enough to keep the filter clear?
Have you re-checked flow after it's collected some oil?

With air compressor use there's not much oil to remove, and my understanding was that filters are replaced when they load up with oil.
Also, that loading up isn't as much of an issue with the pressures of a compressed air system.

Thoughts?

 

Warp,

The filter is sized for the flow and pressure that it "sees". Although I haven't checked the flow recently (after about 800 miles), I have looked at the filter carefully and it is in perfect shape. The thing that normally clogs a coalescing filter is particulate matter. Compressor intake filters are not always as efficient at trapping particulates compared to the intake filters that are part of our engines. For this reason, a particulate filter is generally placed ahead of a coalescing filter in a compressor setup. I seriously doubt that this (particulate)type of filter is necessary in our situation.

Regarding filter replacement - in a compressor system, most large (high pressure/flow) coalescing filters have a built in differential pressure indicator, so that when the pressure drop across the filter reaches 10 psi or so (out of 80-100 psi), the indicator changes color and the filter is replaced. Since our engines' PCV valve line flow and pressure are so low, the only way to tell very accurately whether there is a significant pressure drop is to install a diff press gauge across the filter and run the engine.
Keep in mind that if the line is severely blocked, engine idle should suffer and you will be able to notice. As I mentioned before, I have never had to change a coalescing filter's filter element over many years of use with all kinds of compressors. Still, if you wanted to be extra cautious, simply replace the filter every 12,000 miles. It'll cost about $25 for the element, itself.

Gohard777,

Yes, the earlier you install one, the better.

Dave

 

Sign me up for two...I have a 99 and an 04 z. PM me when they are ready to ship and how to pay.

 

Geeman,

In order that I don't delay the original 10 requestors, I am trying to see if the machine shop can make more extended housings before they ship the original 10. If I can do this and the shipment is scheduled to arrive in a timely manner, I will let you know ASAP.

Dave

 

I disagree; I believe it's virtually a non-issue. How many LS-1s have had problems with coked intake valves (where this would show up)? I've got almost 150,000 miles on mine, 3 years of autocross and DEs, and she dyno'd at 319 rwhp with the only engine mod being a stock airbox with the center cut out of it.

Don't get me wrong, I think it looks nasty as well, but to say it's a huge issue is a bit much.

Have a good one,
Mike

 

It may be like the pulsating brake issue in that tracking the car and/or driving it hard and often tend to prevent the dreaded brake pad buildup on the rotors. Hitting the redline much more often than does the average C5 driver may help prevent carbon buildup and the resulting pinging/timing retardation.

BUT, the average C5 owner does not track his/her car every weekend; thus, the pulsating brakes and the carbon buildup can both cause problems down the road.

 

Geeman, you might be in; I contacted the machine shop and they said they may be able to squeeze in your two as well as the other five extra people (total of 17 sets if I count the original 10 people). I will keep you and the others informed.

Dave

 

i hope so, that be great

 

[QUOTE=Dave68;1558366667]Geeman, you might be in; I contacted the machine shop and they said they may be able to squeeze in your two as well as the other five extra people (total of 17 sets if I count the original 10 people). I will keep you and the others informed./QUOTE]

Thanks, I hope I'm included in that group as well, I think I am though.

Regardless or wether it's a hugh problem or not, I have oil inside my intake manifold !! I don't need that.

 

Secret,

Yes, anyone who requested one is on the list and you did request one. Hopefully, I'll be able to start shipping by next weekend. The machine shop will finish the last seven by this Monday and then ship them to me.

Dave

 

DH