If there was an intake vent, they would not be able to create any vacuum at all. There can't be any CRANKCASE INTAKE VENT on those setups, because they have to create a suction of around 10 to 15" of vacuum, and there could be no suction if there is an intake vent. There can be NO crankcase ventilation flow if a vacuum pump is to work. They do not use it for crankcase ventilation, they use it for crankcase vacuum - big difference.
EVOM PCV VALVE SIZE PLUS
Race engine builders use crankcase vacuum pumps in order to use low tension rings for less drag and that vacuum pump helps those rings stay in contact with the cyl walls to retain cylinder pressure, plus the vacuum reduces windage issues, thus making more hp. That's why numerous short cold running trips are harder on an engine than highway driving, because the short trips don't get the oil up to temp for long enough to boil off the water. The main mechanism for removing moisture from inside the engine is hot oil above 212* boiling off the water. A PCV is also not the main mechanism to get rid of moisture, though air flow can help that somewhat. A lawnmower is another simple example of not having a PCV, the same thing as the older motorcycles just venting to atmosphere.
Without it, blow-by would simply be released into the atmosphere, which has been a big no-no for decades, for cars, and more recently for motorcycles. A PCV system does nothing to really help an engine per se, it really only helps overall emissions, which is why it was originally designed. Though they've changed now in more recent years due to emissions requirements. There was no ventilation flowing THROUGH the crankcase at all.
They had no intake vent at all, they just simply couldn't build up any crankcase pressure.
And high performance Japanese motorcycles that make way more hp per cubic inch than most of our stuff ever will, and that turn more rpm than most of our stuff ever will, for decades used only a single vent tube to simply prevent crankcase pressure from building up. They are merely bleeding off crankcase pressure like ordinary breathers until you get up enough road speed to produce any delta P at all, and even then it can't be called much suction, more like fresh air being gently drawn in, at best. Old road draft tube setups run on older cars could hardly be said to produce negative crankcase pressure.
EVOM PCV VALVE SIZE FULL
To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.For those who wonder if they SHOULD RUN or NOT RUN a PCV, consider the following: The weight of any such item can be found on its detail page. Please also note that the shipping rates for many items we sell are weight-based. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page. When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Note that there are restrictions on some products, and some products cannot be shipped to international destinations. We can ship to virtually any address in the world. We'll notify you via e-mail of your refund once we've received and processed the returned item. If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days). You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.). You may return most new, unopened items within 30 days of delivery for a full refund.
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