case and head vents, do I need to run a breather box? |
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case and head vents, do I need to run a breather box? |
wayne1234 |
Jan 22 2010, 11:23 PM
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#1
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Member Group: Members Posts: 260 Joined: 6-April 09 From: indianapolis in Member No.: 10,238 Region Association: None |
Ok dual webber carbed 2.0, I think the PO had the head vents running to a T then to the oil breather near the oil cap... Is this right?? I did a search and now I'm really confused,,,,
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HAM Inc |
Feb 3 2010, 08:51 AM
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#2
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
A single central vent from the chimney needs to be no larger than a 3/4" heater hose. Where you route it is a subject for discussion. Don't even consider routing it to the exhaust for a crankcase scavenge as that only works at full throttle.
My dad conducted dyno studies on his race T1 engines back in the 70's utilizing exhaust evacutation. The engine had to be totally sealed. It would develop about 3.5-4" of crankcase vacuum and was good for a consistent 1.5% increase in power. But only at full throttle. At part or no throttle there is pressure in the ex system. If you are hell bent on running head vents limit the I.D. of the barb to 1/4" or less. |
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