CCV Mod Bad?
Postmaster
Joined: Jun 2007
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From: Rogue River, OR
Just as a thought...but, perhaps leaving the engine idle for a long period of time, exhaust flow isn't that forceful an just maybe exhaust COULD travel back through the CCV line. But, then again with a check valve in place that's not going to happen. I wonder what the "Crack" limit is on that valve? 
Rog
Rog
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From: MICHIGAN
After seeing some of the concoctions of the CCV mod posted here I'm not surprized they blew the dip stick out of the engine.
One failure and 300 years of science went right out the window.
There are no tests* only failures to follow instructions.
They either didn't:
1. place the probe at the correct angle or
2. they placed in an area of the exhaust that the flow wasn't smooth, without swirls in the flow. This was explained in the link I posted above.
I placed a probe in a DP without the valve and measured 1" of vacuum @ idle....5" @ 2000RPM.
*Bernoulli Principle:
"As the speed of a moving fluid increases, the pressure within the fluid decreases".
Note: Air is a fluid.
Did you ever notice the older engines that came with CCV pipe vented to atmosphere? They are long enough to be placed into the air stream passing under the vehicle and almost always terminate with a 45º cut facing backwards. Bernoulli wins again.
"As the speed of a moving fluid increases, the pressure within the fluid decreases".
Note: Air is a fluid.
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Hotshot
Joined: Oct 2003
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From: Ashland City, TN
Well, you are just using the same principle that the stock setup uses, only doing it in the exhaust.
So, basically, by saying that venting correctly to the exhaust creates crank case pressure, you are saying that the stock setup, which works on the exact same principles, creates crank case pressure as well.
Think about that...
Yea, I'm right there.
When you do a CCV mod in the exhaust you don't just stick a tube in, you sit down there with a vacuum gauge and adjust the pipe for the best vacuum, then tack it in. Like Cuda Jim has done.
So, basically, by saying that venting correctly to the exhaust creates crank case pressure, you are saying that the stock setup, which works on the exact same principles, creates crank case pressure as well.
Think about that...
Yea, I'm right there.
When you do a CCV mod in the exhaust you don't just stick a tube in, you sit down there with a vacuum gauge and adjust the pipe for the best vacuum, then tack it in. Like Cuda Jim has done.
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From: North East Ohio
I have no idea on how much protrusion there was in the exhaust pipe on that truck, or the exact angle, or exactly where in the exhaust sytem it was placed
I fully understand the principles discussed of why it should work, I simply don't care to bother with it. Plumb to up over the brake booster and end it under the cab and be done. No science, no tinkering, no oil dripping, no crankcase back pressure problems.
Heater hose has worked fine for me for over 6 years now. I'm sure it'll break down eventually, then I'll spend another $2 and replace it. Only fuel hose I know of even close to that size is for filler neck vents, and that stuff is spendy. Not even sure if it comes in 3/4" size.
And like I said earlier, I never messed with it on one of my stock trucks, since all I've ever had is OBS with no 'cooler. If I had a 'cooler I'd for sure get that out of there.
I fully understand the principles discussed of why it should work, I simply don't care to bother with it. Plumb to up over the brake booster and end it under the cab and be done. No science, no tinkering, no oil dripping, no crankcase back pressure problems.
Heater hose has worked fine for me for over 6 years now. I'm sure it'll break down eventually, then I'll spend another $2 and replace it. Only fuel hose I know of even close to that size is for filler neck vents, and that stuff is spendy. Not even sure if it comes in 3/4" size.
And like I said earlier, I never messed with it on one of my stock trucks, since all I've ever had is OBS with no 'cooler. If I had a 'cooler I'd for sure get that out of there.
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Post Fiend
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From: MICHIGAN
One other thing i didn't mention....cheap horsepower. I have seen a much as a 20 HP increase by just pulling a vacuum in the crankcase through the exhaust...but, this was on a gasser not a diesel. Add a vacuum pump the HP goes even higher.
I do know that any internal combustion engines will benefit from a vacuum in the crankcase. Especially at higher RPM. The piston rings will flutter at high RPM which doesn't allow them to seal completely or at least as good as they can. The only caveat(s) is that diesels have thicker rings and they normally don't rev that high compared to gassers.
If you vent the CCV mod to close to the cab the odors can get pretty bad not to mention.....it may be illegal....emissions.....one of the reasons a PCV was added to engines 30 + years ago.
I do know that any internal combustion engines will benefit from a vacuum in the crankcase. Especially at higher RPM. The piston rings will flutter at high RPM which doesn't allow them to seal completely or at least as good as they can. The only caveat(s) is that diesels have thicker rings and they normally don't rev that high compared to gassers.
If you vent the CCV mod to close to the cab the odors can get pretty bad not to mention.....it may be illegal....emissions.....one of the reasons a PCV was added to engines 30 + years ago.
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Joined: Jul 2007
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From: Lawrenceburg, TN
I have no idea on how much protrusion there was in the exhaust pipe on that truck, or the exact angle, or exactly where in the exhaust sytem it was placed
I fully understand the principles discussed of why it should work, I simply don't care to bother with it. Plumb to up over the brake booster and end it under the cab and be done. No science, no tinkering, no oil dripping, no crankcase back pressure problems.
Heater hose has worked fine for me for over 6 years now. I'm sure it'll break down eventually, then I'll spend another $2 and replace it. Only fuel hose I know of even close to that size is for filler neck vents, and that stuff is spendy. Not even sure if it comes in 3/4" size.
And like I said earlier, I never messed with it on one of my stock trucks, since all I've ever had is OBS with no 'cooler. If I had a 'cooler I'd for sure get that out of there.
I fully understand the principles discussed of why it should work, I simply don't care to bother with it. Plumb to up over the brake booster and end it under the cab and be done. No science, no tinkering, no oil dripping, no crankcase back pressure problems.
Heater hose has worked fine for me for over 6 years now. I'm sure it'll break down eventually, then I'll spend another $2 and replace it. Only fuel hose I know of even close to that size is for filler neck vents, and that stuff is spendy. Not even sure if it comes in 3/4" size.
And like I said earlier, I never messed with it on one of my stock trucks, since all I've ever had is OBS with no 'cooler. If I had a 'cooler I'd for sure get that out of there.
I have mine done like Jim's. The only problem I have is the fumes are anoyning when at a drive thru window and such. It dont bother me when driving or at a traffic light, but when setting next to a building its pretty bad. I know PPl look at the fumes coming out from under my truck and think " look at that smoking piece of junk". I guess I just need to make mine longer and run it out to the back somewhere.
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I have them, but they are way under $100, less than half. The kit comes with Fuel rated hose so you don't have to worry later on about a mess.
Hotshot
Joined: Jul 2008
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From: Thomasville, GA
Between that and my new 6637 and cover i'm gonna be losing a lot of paychecks to you...
Posting Guru
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From: THUNDER BAY
I have the ccv mod as well I have had a few problems with freezing in the winter it can get cold here I had it dumping all the way in the back which kept the smell away but would freeze and you know what happens then so I now have it just dumping under the cab near the motor and it stinks some times I would like to try the exhaust thing and was wondering Jim what hose do you use? and I see you mentioned you tested Hg at the down pipe did you test out by the tailpipe or where the cat is or supposed to be lol
Thanks
Walter
Thanks
Walter
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From: MICHIGAN
I have the ccv mod as well I have had a few problems with freezing in the winter it can get cold here I had it dumping all the way in the back which kept the smell away but would freeze and you know what happens then so I now have it just dumping under the cab near the motor and it stinks some times I would like to try the exhaust thing and was wondering Jim what hose do you use? and I see you mentioned you tested Hg at the down pipe did you test out by the tailpipe or where the cat is or supposed to be lol
Thanks
Walter
Thanks
Walter
Speed of the exhaust is critical. I assume the exhaust is still fast enough even at the end of the system unless you have increased the pipe size.
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Joined: Nov 2003
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From: THUNDER BAY
Walter, I haven't installed one that far back but I did put one about where the muffler used to be, lol, on a 4" straight piped truck. I got good vacuum there too. I just used heater hose.....that was 3 years ago and it's still OK. The owner wants me to hard pipe it when the heater hose craps out. Some time in the future it's going collapse under the vacuum IMO.
Speed of the exhaust is critical. I assume the exhaust is still fast enough even at the end of the system unless you have increased the pipe size.
Speed of the exhaust is critical. I assume the exhaust is still fast enough even at the end of the system unless you have increased the pipe size.
thanks
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jeffreyt
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Oct 18, 2012 07:16 PM
