Just ordered a Crankcase evacuation system...
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Just ordered a Crankcase evacuation system...
Right now - I have my PCV valve hooked up to the carb.. which sucks oil and hot air into the engine... I decided to get a Vacuum evacuation system that hooks up 2 breathers to the collectors (headers)...
Does anybody else run such system??
http://store.summitracing.com/partde...art=MRG%2D6002
[Modified by GrandSportC3, 11:57 AM 10/22/2003]
Does anybody else run such system??
http://store.summitracing.com/partde...art=MRG%2D6002
[Modified by GrandSportC3, 11:57 AM 10/22/2003]
Safety Car
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From: Rochester NY
Re: Just ordered a Crankcase evacuation system... (BeaterShark)
I had considered it at one time, but read that it is only effective when running open headers or race mufflers.
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Re: Just ordered a Crankcase evacuation system... (BeaterShark)
I had considered it at one time, but read that it is only effective when running open headers or race mufflers.
Melting Slicks
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From: Pomfret, CT
Finalist 2020 C4 of the Year - Unmodified
Re: Just ordered a Crankcase evacuation system... (GrandSportC3)
I run it on my Chevelle! Works good. It will work on a car with mufflers also. All it does is vent it out the headers and through the mufflers..
-Rick
-Rick
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Re: Just ordered a Crankcase evacuation system... (cicch95)
I run it on my Chevelle! Works good. It will work on a car with mufflers also. All it does is vent it out the headers and through the mufflers..
-Rick
-Rick
I just don't want to re-circulate the hot air and oil from the crankcase...
Drifting
Joined: Oct 2000
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From: Shawano WI
Re: Just ordered a Crankcase evacuation system... (GrandSportC3)
They have to go into the collector. Do not try to put them into a primary pipe or you will not get any scavange from them. The fact that you have side mount headers means that you will have to mount them outside of the car to get them into the collector. Also order an extra set of valves as they have a tendancy to blowout easily.
Melting Slicks
Joined: Mar 1999
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From: Apex NC
Re: Just ordered a Crankcase evacuation system... (GrandSportC3)
Is this really an effective system for street use? I can see how it would work for short WOT passes, but at part throttle cruise or during normal driving, I can't see that the exhaust will pull enough vacuum to evacuate the crankcase gasses very effectively. Seems to me like a case of a race setup that would not be particularly suited for street use.
:confused:
:confused:
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Re: Just ordered a Crankcase evacuation system... (Pete79L82)
They have to go into the collector. Do not try to put them into a primary pipe or you will not get any scavange from them. The fact that you have side mount headers means that you will have to mount them outside of the car to get them into the collector. Also order an extra set of valves as they have a tendancy to blowout easily.
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Re: Just ordered a Crankcase evacuation system... (sb69coupe)
Is this really an effective system for street use? I can see how it would work for short WOT passes, but at part throttle cruise or during normal driving, I can't see that the exhaust will pull enough vacuum to evacuate the crankcase gasses very effectively. Seems to me like a case of a race setup that would not be particularly suited for street use.
:confused:
:confused:
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From: Clearwater FL
Re: Just ordered a Crankcase evacuation system... (GrandSportC3)
He does a lot of drag racing. I think thats the main purpose of this vette. Beside he's got a nice C5 to cruises in. :thumbs:
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Re: Just ordered a Crankcase evacuation system... (Van Steel)
He does a lot of drag racing. I think thats the main purpose of this vette. Beside he's got a nice C5 to cruises in. :thumbs:
Another problem is that I don't really want to drive the car for 240 miles in the "track setup" to the track... The front skinny wheels as also the ET Streets on the back aren't really made for the street and the space in the car is very small to carry all those tires in the car...
[Modified by GrandSportC3, 1:53 PM 10/22/2003]
Melting Slicks
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From: WANTED: '68 rear valance with b/u light assemblies IM, e-mail, or PM me here. Thanks!
Re: Just ordered a Crankcase evacuation system... (Xracer)
I had considered it at one time, but read that it is only effective when running open headers or race mufflers.
Absolutly true, not good for a street car.
Absolutly true, not good for a street car.
You haven't wasted your money though. I ran a combination evacuator and pcv system on my 64 S/S Dodge and it worked pretty well. The pcv does its thing at low rpm and the crankcase evac performed pretty well while racing.
How did I know? I fabricated my own oil pan and it had pinhole leaks after the first attempt. It did not leak at high RPM... that's some internal low pressure working.
I'll try to dig up some pictures of the system I made if your interested.
[Modified by 63Banshee, 1:04 PM 10/22/2003]
Drifting
Joined: Oct 2000
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From: Shawano WI
Re: Just ordered a Crankcase evacuation system... (GrandSportC3)
Well - if you are not running WOT - the crankcase pressure won't be too high and the system will just act like regular breathers...
I used to use them on the dyno before better stuff came along. The worked well for what they are. but I don't know of anyone that used them on a street driven car.
Pete
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Re: Just ordered a Crankcase evacuation system... (63Banshee)
I had considered it at one time, but read that it is only effective when running open headers or race mufflers.
Absolutly true, not good for a street car.
Yeah, not good on a street car cause there is no evacuation at low RPM and you need a very low backpressure exhaust system for it to work.
You haven't wasted your money though. I ran a combination evacuator and pcv system on my 64 S/S Dodge and it worked pretty well. The pcv does its thing at low rpm and the crankcase evac performed pretty well while racing.
How did I know? I fabricated my own oil pan and it had pinhole leaks after the first attempt. It did not leak at high RPM... that's some internal low pressure working.
I'll try to dig up some pictures of the system I made if your interested.
Absolutly true, not good for a street car.
Yeah, not good on a street car cause there is no evacuation at low RPM and you need a very low backpressure exhaust system for it to work.
You haven't wasted your money though. I ran a combination evacuator and pcv system on my 64 S/S Dodge and it worked pretty well. The pcv does its thing at low rpm and the crankcase evac performed pretty well while racing.
How did I know? I fabricated my own oil pan and it had pinhole leaks after the first attempt. It did not leak at high RPM... that's some internal low pressure working.
I'll try to dig up some pictures of the system I made if your interested.
Anyway - I run open pipes and basically have no backpressure in my exhaust system... so the system will work great for me!
[Modified by GrandSportC3, 2:08 PM 10/22/2003]
[Modified by GrandSportC3, 2:08 PM 10/22/2003]
Melting Slicks
Joined: Mar 2000
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From: WANTED: '68 rear valance with b/u light assemblies IM, e-mail, or PM me here. Thanks!
Re: Just ordered a Crankcase evacuation system... (GrandSportC3)
Why would you need a big deal of evacuation at low RPM's?? The pressure at low RPM's is not too high... so evacuation isn't needed as much as with WOT...
Anyway - I run open pipes and basically have no backpressure in my exhaust system... so the system will work great for me!
Anyway - I run open pipes and basically have no backpressure in my exhaust system... so the system will work great for me!
Do it your way and let us know what your spark plugs look like after a few trips around town.
Melting Slicks
Joined: Mar 1999
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From: Apex NC
Re: Just ordered a Crankcase evacuation system... (GrandSportC3)
Why would you need a lot of evacuation at low RPM's?? The pressure at low RPM's is not too high... so evacuation isn't needed as much as with WOT...
Anyway - I run open pipes and basically have no backpressure in my exhaust system... so the system will work great for me!
Anyway - I run open pipes and basically have no backpressure in my exhaust system... so the system will work great for me!
You keep saying that "the system will work great for you", despite what others here are pointing out. The vendor states that this system is oriented for drag race use. Didn't you just drive your '68 across the state for a show last weekend or so? If you're turning the car into a race car, then you'll likely be OK. If you're going to continue driving it on the street, I predict oil leaks in your future.
Just my $0.02. I'm no engine builder by any stretch of the imagination. I feel sure that GM didn't just put PCV systems on these cars to handle WOT crankcase pressure issues.....
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Re: Just ordered a Crankcase evacuation system... (63Banshee)
Why would you need a big deal of evacuation at low RPM's?? The pressure at low RPM's is not too high... so evacuation isn't needed as much as with WOT...
Anyway - I run open pipes and basically have no backpressure in my exhaust system... so the system will work great for me!
I think you missed the point. The pcv system is used at low RPM. You need this on a street driven car. You have low backpressure exhaust, good. With the evac system you will only vent the crankcase at high RPM.
Do it your way and let us know what your spark plugs look like after a few trips around town.
Anyway - I run open pipes and basically have no backpressure in my exhaust system... so the system will work great for me!
I think you missed the point. The pcv system is used at low RPM. You need this on a street driven car. You have low backpressure exhaust, good. With the evac system you will only vent the crankcase at high RPM.
Do it your way and let us know what your spark plugs look like after a few trips around town.
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Re: Just ordered a Crankcase evacuation system... (sb69coupe)
Why would you need a lot of evacuation at low RPM's?? The pressure at low RPM's is not too high... so evacuation isn't needed as much as with WOT...
Anyway - I run open pipes and basically have no backpressure in my exhaust system... so the system will work great for me!
As pointed out, there will be pressure at all RPM ranges. It's not the backpressure of the exhaust that effects the vacuum on the system, it's the venturi effect of the exhaust stream going past the fitting, causing a vacuum to scavenge the gasses.
You keep saying that "the system will work great for you", despite what others here are pointing out. The vendor states that this system is oriented for drag race use. Didn't you just drive your '68 across the state for a show last weekend or so? If you're turning the car into a race car, then you'll likely be OK. If you're going to continue driving it on the street, I predict oil leaks in your future.
Just my $0.02. I'm no engine builder by any stretch of the imagination. I feel sure that GM didn't just put PCV systems on these cars to handle WOT crankcase pressure issues.....
Anyway - I run open pipes and basically have no backpressure in my exhaust system... so the system will work great for me!
As pointed out, there will be pressure at all RPM ranges. It's not the backpressure of the exhaust that effects the vacuum on the system, it's the venturi effect of the exhaust stream going past the fitting, causing a vacuum to scavenge the gasses.
You keep saying that "the system will work great for you", despite what others here are pointing out. The vendor states that this system is oriented for drag race use. Didn't you just drive your '68 across the state for a show last weekend or so? If you're turning the car into a race car, then you'll likely be OK. If you're going to continue driving it on the street, I predict oil leaks in your future.
Just my $0.02. I'm no engine builder by any stretch of the imagination. I feel sure that GM didn't just put PCV systems on these cars to handle WOT crankcase pressure issues.....
I also know several people that just run breathers without a hooked up PCV system and they have no issues either...
[Modified by GrandSportC3, 2:29 PM 10/22/2003]
Drifting
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From: Shawano WI
Re: Just ordered a Crankcase evacuation system... (GrandSportC3)
A friend of mine runs his breathers directly into a overflow container without it being hooked up to the vacuum system or exhaust and he has no oil leaks...
I also know several people that just run breathers without a hooked up PCV system and they have no issues either...
I also know several people that just run breathers without a hooked up PCV system and they have no issues either...
If all you want to do is to use it as a breather then just putting a hose in a catch can will work fine. But that will only get you to zero pressure, not to vacuum.
Pete