where to lead the diesel blow back tube?
Submitted: Saturday, Dec 31, 2005 at 21:10
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F4Phantom
Hi guys, I am fitting a
snorkel and found this little tube from the engine block, which goes through a little triangle shaped container and then into the air intake manifold. A mate told me to lead it else where as it dumps burned fuel and other blow back or over pressured gasses from the engine back into the intake and it is not good for the engine. He recommends just leading it into a container which I should empty intermittently. My question is what does this device actually do and should I follow my mates instructions? Thanks.
Reply By: howesy - Saturday, Dec 31, 2005 at 23:05
Saturday, Dec 31, 2005 at 23:05
A lot of older style diesels have it open to air it releases crank case pressure and recycles crank case fumes to get burnt when routed through the inlet manifold. All vehicles must comply with ADR (aust. design rules) applicable to their year of manufacture and if you get pulled over by EPA you may find yourself with a fine if you have it open to air on the wrong model but who would know otherwise. Plenty of diesels lasted the distance with the gases recycled and their is no conclusive proof to say that it would significantly reduce engine life to recycle these gases.
It's up to you what you do but what ever you do DONT BLOCK IT OFF COMPLETELY as this will result in pressurisation of the crank case and this is definately not good for your engine.
AnswerID:
146133
Follow Up By: F4Phantom - Sunday, Jan 01, 2006 at 00:12
Sunday, Jan 01, 2006 at 00:12
thanks, do you know what the triangle box is for? also is there any benefit to having the thing back into the manifold (original) such as better fuel economy because some unburned fuel is getting recycled? if not then i will not bother because it's all to hard with the
snorkel set up.
FollowupID:
399712
Reply By: Member - Geoff M (Newcastle) - Saturday, Dec 31, 2005 at 23:23
Saturday, Dec 31, 2005 at 23:23
Why not just leave it where it is?
Some engineer in Japan or England or America or KickaTinAlong thought it was a good idea at the time!
Geoff.
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AnswerID:
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Reply By: howesy - Sunday, Jan 01, 2006 at 00:27
Sunday, Jan 01, 2006 at 00:27
The box would more than likely be an oil inhibitor to avoid oil being sucked up through the line. It is not going to give nticeable benefit to any economy so if its a drama just get a cheap oil catch can with a top vent and run it to there. It's really not going to hurt to leave it connected to the inlet manifold either as 99.9 % of the modern diesels out there are running it.
AnswerID:
146139
Follow Up By: F4Phantom - Sunday, Jan 01, 2006 at 00:35
Sunday, Jan 01, 2006 at 00:35
thanks mate, thats awesome, i would leave it in but it's connected to the old air filter and all that has been removed to get a nice straight through
snorkel and new filter system (all
home job). BTW happy new year, now get off the computer and let off some fire crackers!
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