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#1
19th September 2011, 07:01 PM
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CVH crankcase breathing
Hi,
There are to pipes from the rocker cover, one goes to the crankcase and the other to the air filter. As I wont be fitting the Sierra original filter (will be using a piper cross), do you have to fit a catch tank for IVA ? Cheers Peter 
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#2
19th September 2011, 07:43 PM
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No you don't. But it will stop oil vapour going over the engine.
__________________
http://s831.photobucket.com/user/dav...ter%20Pictures OTR 01/05/14 - 1.6 CVH, Type 9, Bike Carbs, Megajolt
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#3
19th September 2011, 08:10 PM
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I will be attempting to get positive crank case breathing set up with my Piper.
TT
__________________
You only get a woosh with a dump valve Build Thread Man Cave Mantiques Cecil Street Auto Repairs Garage Carlisle Build Cost £4181.65 - Last - Wheel Cylinders
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#4
19th September 2011, 08:22 PM
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The yanks use these welded into the collectors and the exhaust gases passing the end cause a vacuum and burn of the breathing fumes. Early range rovers also had them. Very effective and no pongs, but not sure what they will do for emmisions.
http://performanceparts.com/performa...asket_6002.jpg http://i140.photobucket.com/albums/r...ashcutcopy.jpg Bob
__________________
When The Results Disagree With The Theory: Believe The Results And Invent A New Theory If I had two brains I,d still be a halfwit The cave http://s1116.photobucket.com/user/my...deshow/mancave The build http://www.haynes.co.uk/forums/showthread.php?t=12669 Last edited by robo : 19th September 2011 at 09:36 PM.
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#6
20th September 2011, 11:10 AM
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Catch tank and feed back to filter and it will stop any vapour or smells,just be aware of backfires in carb setting fire to varour.
__________________
Cost : Little as possible. Thanks : To those who by their generosity my build has progressed. Its a handmade sports car not a flaming kit car !!! If at first you dont succeed,avoid skydiving... No parachute require to freefall,only if you want to do it twice.
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#7
20th September 2011, 07:18 PM
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That yank system is a lot more effective as it causes the crankcase to be a negative pressure, less windage = more power all the other systems dont address the the problem. Only down side is a bit more plumbing. Puke cans are just more bits to make and mount with associated plumbing.
Bob
__________________
When The Results Disagree With The Theory: Believe The Results And Invent A New Theory If I had two brains I,d still be a halfwit The cave http://s1116.photobucket.com/user/my...deshow/mancave The build http://www.haynes.co.uk/forums/showthread.php?t=12669 Last edited by robo : 20th September 2011 at 07:21 PM.
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#8
21st September 2011, 09:06 PM
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if you use systems that the exaust create the vac for the crankcase it makes the hc's go sky high so could be probs for mot's and iva
thats why we burn by passing it into the inlet on alost every car  for what your going to gain i dont think its worth it for the gains tbh
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#9
22nd September 2011, 08:24 AM
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Range rover had the exhaust type system in place for a number of years without emmision problems. They had a small filter on the back of the manifold to allow a small amount of clean air in as the engine was running,that might have been the way round the problem. The trouble with inlet type pcv is that at wot there is no vacuum and fit any type of race cam and you can forget it,. Honda reckon pcv is worth about 5% on the dyno, like you say not much but add in better oil control, less oil leaks to name a few I think I will have a play. Will let you know how I get on
Bob
__________________
When The Results Disagree With The Theory: Believe The Results And Invent A New Theory If I had two brains I,d still be a halfwit The cave http://s1116.photobucket.com/user/my...deshow/mancave The build http://www.haynes.co.uk/forums/showthread.php?t=12669 Last edited by robo : 22nd September 2011 at 09:32 AM.
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