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--- techtalk:ref:carb06 [2019/09/15 16:51]
hippysmack [Aftermarket Air Cleaners and Modifications]
+++ techtalk:ref:carb06 [2021/01/21 14:41]
ixl2relax
@@ Line 5: / Line 5: @@
 ====== Air Cleaner ======
 ===== Sub Documents =====
-  * [[techtalk:evo:carb05a|Homemade Air Cleaner Assembly]]
+  * [[techtalk:ref:carb06a|Homemade Round Air Cleaner Assembly]]
 See also [[techtalk:ref:engmech05#breather_vent_relocation|Breather Vent Relocation]] in the REF section of the Sportsterpedia. \\
@@ Line 34: / Line 34: @@
 {{:techtalk:ref:carb:hd_breather_mod_1_by_jcmellis.jpg?direct&300|}} ((photo by jcmellis of the XLFORUM http://xlforum.net/forums/showthread.php?t=1179974)) {{:techtalk:ref:carb:hd_breather_mod_2_by_jcmellis.jpg?direct&300|}} ((photo by jcmellis of the XLFORUM http://xlforum.net/forums/showthread.php?t=1179974))
+===== Big Sucker w/External Breather =====
+See XLForum Thread: http://xlforum.net/forums/showthread.php?t=34956 - Post#17
+How to modify the BigSucker to vent to the atmoshere.
+http://xlforum.net/forums/showthread.php?t=34956
+Commentary Posted by Dodgenbullets (See Post #17 & #19)
+After playing with different ideas, I found an easy fix for the Bigsucker intake. Your EVO will vent 100% of the crank case pressure to the atmosphere. IMO, the 1\16 hole in your stock breather bolts is not sufficient. Due to restrictor bushings in the BigSucker, it isn't any better.
+I was picking up some fuel line at an indie. I aked for some hose clamps and he opened a drawer with all kinds of neat looking stuff most call misc. hardware. There was various banjos and breathers. After blowing 2 sets of rocker cover gaskets and repeatedly spraying my slide with gumout I had it. First thought was to drill holes in the BS and put bleeder screws in the passages. Next was to use shortened stock bolts with vacume line.in them. I remembered the bolts in the drawer and said, now why didn't I think of that sooner. It works perfect.
+After doing this mod, even my bad rocker cover gaskets stopped leaking. One reason why I feel that crank case pressure is not fully expelled with the BigSucker. Ness is only doing what HD is as far as the size of the breather holes. When Ness first introduced this intake you had to put the restrictor bushings in the banjo bolts your self. If I knew any better I wouldn't have.
+The Mod:
+For this mod you need HD# 3577 (2). These are breather bolts for early EVO motors (not banjos) and cost about $3.50 each. Next, is part# 24922-93. These are the boots that will slip over those bolts. 5/16 OD vacume line, a Tee fitting and 5 fuel injection clamps. NAPA auto parts is your best bet for non HD parts. The boots are pre-bent for another application. You need to snip them leaving an inch of the tubing.
+Remove the banjo bolts 1 at a time and thread in its place part# 3577. Place one of the original O rings on each bolt. The side benifit here is these bolts have allen heads. No more trying to find a thin wrench that fits between the backing plate and it's mounting sleeve . While your at it, take those O rings to Ace hardware and get new ones. I went with O rings that were slightly thicker, and a slightly larger OD diameter, same ID of course. The new bolts will plug off the old oil vent passages in the BigSucker so nothing needs to be done here.
+Press the boots on the new breather bolts. You can see in the pics the air filter will keep them in place.
+place a fuel injector clamp on each one. Now slip a 5 1/2 inch piece of 5/16 vacume line inside the one inch tail you left on each boot. Clamp it.
+Now point the front breather hose toward your front axle and the back one to the rear axle. Have them meet in the Tee fitting under your float bowl. Run the single line off the Tee along side the carberator overflow line.
+You don't need to run a filter on this or any other breather. That is if your vent line is 12 inches or longer . It's just not necescary. Keep in mind your stock breather holes were just 1/16 of an inch. This is a huge improvement.
+Here's an opportunity to paint the backing plate. Mask off the Air cleaner side and the area on the back where the carb gasket sits. I used HD areosal part# 98606DH the same color as my motor. When your done this will look good . No horseshoe, hoses, or filters in sight. It looks very much like a factory set up.
+A variety of air filters and covers can now be used. . I interchange between a round cover and the "Ham Can" while using an over sized K&N filter. To bolt up the stock "HamCan", take the bracket off the factory element and simply put it on the BS filter. Also, you can buy a replacement filter for the stage 2 BigSucker and put it in your stage 1 kit. The filter element is the only difference in the stage 1 and 2. There's one replacement filter for all stage 2 applications. 3 holes match the CV 40, the others plug off. Now go try
 ====== Running the Breather Hoses (91 and UP) ======
 ===== How the umbrella ( head breather) valves work =====
 Read more about the breather system here: [[techtalk:evo:engmech07|Evo Crankcase Ventilation]]. \\
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-====== Mods ======
 ====== Pics of Air Cleaners ======

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