Vent hose routing question |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Vent hose routing question |
rosenfe |
Jan 31 2016, 10:25 AM
Post
#1
|
Senior Member Group: Members Posts: 557 Joined: 14-October 13 From: northern california Member No.: 16,512 Region Association: None |
On my 73 2.0 with carbs.so I have gas tank vent going to head that's ok but what do I do with hoses coming from left and right head? Should I join both and put into port at oil filler housing?
|
SirAndy |
Jan 31 2016, 04:41 PM
Post
#2
|
Resident German Group: Admin Posts: 41,669 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
On my 73 2.0 with carbs.so I have gas tank vent going to head that's ok No, that's anything BUT ok ... The crankcase can have positive pressure depending on the engine RPM, meaning, you will blow oil vapors into your gastank. The tank vent needs to be routed to the air intake, preferably BEFORE the air filter. The head vents can be routed to a oil catch can, like the one i used on my 2056: (IMG:http://www.914world.com/bbs2/uploads/post-179-1421010724.jpg) PS: We still haven't seen any pictures of your setup. |
rosenfe |
Jan 31 2016, 07:05 PM
Post
#3
|
Senior Member Group: Members Posts: 557 Joined: 14-October 13 From: northern california Member No.: 16,512 Region Association: None |
yes i know about pics sorry,but as ive taken vent hoses off except gas tank vent ,there really isnt anything to see.so in your set up your useing a breather box with a seperate catch can?i where did you get your bb and catch can,ive seen the tangerine product,but it vents through filter to atmosphere.
|
rosenfe |
Jan 31 2016, 07:10 PM
Post
#4
|
Senior Member Group: Members Posts: 557 Joined: 14-October 13 From: northern california Member No.: 16,512 Region Association: None |
i understand now about gas vent,but my carbs are weber 34 ict,with no provision for inserting a vent.where should i place gas vent in this case.
|
rosenfe |
Jan 31 2016, 07:13 PM
Post
#5
|
Senior Member Group: Members Posts: 557 Joined: 14-October 13 From: northern california Member No.: 16,512 Region Association: None |
so you are saying to insert gas vent to air filter on carbs,my filters are tiny and have no provision for inlet hose.
|
rosenfe |
Jan 31 2016, 07:25 PM
Post
#6
|
Senior Member Group: Members Posts: 557 Joined: 14-October 13 From: northern california Member No.: 16,512 Region Association: None |
forgive all my questions,but my engine has 2 vents at head below spark plugs and one on drivers side almost next to cylinder 2,thats where gas vent is plugged in.
|
SirAndy |
Jan 31 2016, 07:26 PM
Post
#7
|
Resident German Group: Admin Posts: 41,669 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
so you are saying to insert gas vent to air filter on carbs,my filters are tiny and have no provision for inlet hose. None of the after market carbs are setup for the tank breather. You'll have to make your own connectors. (IMG:style_emoticons/default/smile.gif) |
michael7810 |
Jan 31 2016, 09:02 PM
Post
#8
|
Senior Member Group: Members Posts: 1,081 Joined: 6-June 11 From: Scottsdale, AZ Member No.: 13,164 Region Association: Southwest Region |
so you are saying to insert gas vent to air filter on carbs,my filters are tiny and have no provision for inlet hose. None of the after market carbs are setup for the tank breather. You'll have to make your own connectors. (IMG:style_emoticons/default/smile.gif) Here's my vent system on a 72 1.7L with carbs. |
TheCabinetmaker |
Jan 31 2016, 09:39 PM
Post
#9
|
I drive my car everyday Group: Members Posts: 8,301 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
forgive all my questions,but my engine has 2 vents at head below spark plugs and one on drivers side almost next to cylinder 2,thats where gas vent is plugged in. As mentioned earlier, the gas vent line should not be connected to the head. Both heads should vent to a catch can and then back to the oil filler or to the air cleaners. |
rhodyguy |
Jan 31 2016, 09:58 PM
Post
#10
|
Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,084 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
That style of BB is not a sealed unit. There are little stand offs on the top. There is a foam filter inside that helps trap the oil vapors, the puddle of oils forms on the bottom, and runs out of the 2 side ports. The foam trap should squeezed occasionally to rid it of oil. You can also plumb the 2 side ports to the head vents as they are open to the valve train area and let gravity do the work.
|
rosenfe |
Jan 31 2016, 11:08 PM
Post
#11
|
Senior Member Group: Members Posts: 557 Joined: 14-October 13 From: northern california Member No.: 16,512 Region Association: None |
thanks for all the info.in that diagram the gas tank vent is going to port in fan shroud ,thats where my vent is plugged to. i will get a bb and connect head vents and oil filler van to it.
|
michael7810 |
Feb 1 2016, 07:48 AM
Post
#12
|
Senior Member Group: Members Posts: 1,081 Joined: 6-June 11 From: Scottsdale, AZ Member No.: 13,164 Region Association: Southwest Region |
If you follow the arrows. The hose on the fan shroud pushes air thru the canister, picking up the fuel fumes, then into the carbs.
|
Mark Henry |
Feb 1 2016, 04:55 PM
Post
#13
|
that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
so you are saying to insert gas vent to air filter on carbs,my filters are tiny and have no provision for inlet hose. None of the after market carbs are setup for the tank breather. You'll have to make your own connectors. (IMG:style_emoticons/default/smile.gif) Here's my vent system on a 72 1.7L with carbs. That's close but still wrong. The blow through for the C. canister should be a separate hose to the air filter. Fuel venting and crankcase venting should never meet. |
SirAndy |
Feb 1 2016, 05:19 PM
Post
#14
|
Resident German Group: Admin Posts: 41,669 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
The blow through for the C. canister should be a separate hose to the air filter. Fuel venting and crankcase venting should never meet. (IMG:style_emoticons/default/agree.gif) |
rosenfe |
Feb 1 2016, 05:24 PM
Post
#15
|
Senior Member Group: Members Posts: 557 Joined: 14-October 13 From: northern california Member No.: 16,512 Region Association: None |
just got a empi bb,and a fitting for top of air cleaner to vent gas tank.thanks for all the clarification
|
michael7810 |
Feb 2 2016, 01:30 PM
Post
#16
|
Senior Member Group: Members Posts: 1,081 Joined: 6-June 11 From: Scottsdale, AZ Member No.: 13,164 Region Association: Southwest Region |
The blow through for the C. canister should be a separate hose to the air filter. Fuel venting and crankcase venting should never meet. (IMG:style_emoticons/default/agree.gif) Thanks - I'll work on that next time I'm in there. If I move all crankcase vent to 1 carb and fuel vent to the other; will that be OK? |
Lo-Fi Version | Time is now: 2nd June 2024 - 10:15 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |