Dave Bailey
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| posted on 14/10/08 at 09:11 PM |
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Engine breathing
O.k. I have dry sumped my ST170 engine and have removed the crank case breather and plan to plug the dipstick tube where it enters the block. This
will mena that the sump could be running a slight vacuum which is apparently better for performance etc. The cam box breather I plan to route into a
catch tank through a one way valve and then also vent the dry sump tank into the catch tank also. The catch tank I have seen does not seem to have a
filter or vent on the top. Is this going to be a problem? Why do some tanks have filters and other not?
thanks
Dave B
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mark chandler
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| posted on 14/10/08 at 09:49 PM |
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The best place to vent is on the top of the catch tank, if the tank is inside the car where you will breath the fumes its sealed so you vent by the
engine on the return path.
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Canada EH!
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| posted on 14/10/08 at 09:53 PM |
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engine breathing
You need somewere for the expansion of gases to be expelled from the crankcase, or you will be replacing seals at a fantastic rate as the crankcase
pressure will force oil out of every oriface in the engine. Rememmber you have pistons flailing up and down and a crank spinning a 8000 RPM, moves a
lot of air.
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02GF74
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| posted on 15/10/08 at 08:29 AM |
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quote:
Originally posted by Canada EH!
Rememmber you have pistons flailing up and down and a crank spinning a 8000 RPM, moves a lot of air.
yeah but at any one time two pistons move up thus drawing up air and two move down thus forcing air down into the crankcase, the net result should be
no change in crankcase pressure?
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mr henderson
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| posted on 15/10/08 at 08:35 AM |
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quote:
Originally posted by 02GF74
quote:
Originally posted by Canada EH!
Rememmber you have pistons flailing up and down and a crank spinning a 8000 RPM, moves a lot of air.
yeah but at any one time two pistons move up thus drawing up air and two move down thus forcing air down into the crankcase, the net result should be
no change in crankcase pressure?
Bound to be some blow by gases in the crankcase. The idea of PCV is to suck those gases out and to burn them in the engine
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AndyGT
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| posted on 15/10/08 at 08:50 AM |
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first fitted to volvo's in the early 60's then quickly copied on all EU cars too as they realised that all those fumes can't be good
for ones health!!!
On most my "weekend cars" I have had them open crankcased breathing as surely a few cars on open crankcase cant be that bad for the earth.
Plus each time the engine turns you are getting a cleaner charge of air so surely this reduces our "CO footprint". i.e. fuel.
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nz_climber
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| posted on 16/10/08 at 03:55 AM |
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With a dry sump you won't need a dipstick.. As there should never be any oil in there! Just have a look in the tank!
http://aarons7.wordpress.com
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Jenko
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| posted on 16/10/08 at 03:53 PM |
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There is a good article on Engine breathing in this months fast ford (or is performance ford?)....The one with the red Escort RS turbo) on the
cover...
The mag is a little max power, too much talk about the size of 'rims' for my liking, but these performance ford boys do some amazing
things with the engines, and the detailing is really quite incredible.......
Wortha read anyway....
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