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June 29th, 2009, 02:09 PM   #61
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"An automotive air pump check valve serves the purpose nicely @ a fraction of the HD cost. One may purchase KEM part number 174-176 or cross reference said number to that of your local automotive vendors inventory (Kragen, etc.) . "

i don't know what a KEM number means? it's not a term i understand. i would like to get some check valves, can anyone put me onto one of those web sites that does this kind of thing?

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Taffy
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June 29th, 2009, 02:11 PM   #62
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Originally Posted by cypher
Air Injection Check Valve (Jaguar # C34017) All XJS with V12
(Note: This is a GM part. It is used, for example on a 350 cu inch Chevrolet V8.
A1 Cardone A42-103
AC Delco 2332530
Automotive Electronics 17001
Big A 46-1005
Borg Warner CV8
Filko 45-105
GP Sorenson / Guaranteed Parts 779-2929
Kem 174-176
Motormite 55050
NAPA 2-2900
Niehoff FE-476
Sound Solution 15903
Standard / Carquest AV7
Tomco Ellis 17001
Walker 15903
kem is just the make.

above are alternative part numbers for the same thing, thats already in this thread.
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June 30th, 2009, 07:17 AM   #63
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Hey Taffy
Want me to mail you one or two??
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June 30th, 2009, 10:06 AM   #64
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i think we already ordered thanks bob! we went for the jaguar parts. we need something classy on the outfit!

regards

Taffy
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June 30th, 2009, 06:12 PM   #65
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Originally Posted by Taffy
i think we already ordered thanks bob! we went for the jaguar parts. we need something classy on the outfit!

regards

Taffy
Dam limey snobs
bob
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July 5th, 2009, 03:39 AM   #66
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Very interessing subject and amzing how much theorie is behind a simple vavle.

Dale wrote:
"Hi Rancheroracer,
Crankshaft cavity scavenging operates via pressure differential between the main crankcase and said cavity. By installing a check valve in the engine vent line a vacuum is created in the entire engine assembly, however, the pressure differential between the crankshaft cavity and main crankcase remains the same.

Hope this helps. "

This partially answered the question I wanted to post: how about the function of the reed valve?
I'm not sure but doesn't the piston/reed-valve-combo acts as an oil pump to splash oil onto the distribution chain, wich in turn brings the oil up to the camshaft for lubrification purposes? Is this affected in any way?
Or perhaps I see it completely wrong, wouldn't be the first time

Cheers,
Adriaan
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July 5th, 2009, 04:18 AM   #67
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hello adriaan

the reed valve is simply there to get oil away from below the crankshaft once it has done it's job of oiling all the mains, big end and piston. as the piston comes down there is a massive increase in pressure below the crank and the reed valve is effectively blown open and air driven out taking oil with it each time.

the general whizzing of gears just touching the top of the oil in the left cover means that everything in the left cover is getting enough oil to lubricate it but it's from here that the increase in pressure goes up the chain tunnesl and out the engine breather.

all very clever!

regards

Taffy
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July 5th, 2009, 04:37 PM   #68
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there is also the effect of the big hole up near the intermediate shaft

without that big hole and with a sealed bearing on the intermidiate shaft there should be little performance to gain from a checkvalve perhaps?

as is like taffy said the reedvalve is just a scavanging pump not really a crankcase vacuum maker casue of all the oles
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July 6th, 2009, 09:12 AM   #69
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The lower the air pressure in the gearbox the slower the oil can get pressed through the wire gauze filter into the oil pump.
Also I don't think that you want vacuum in the rocker box because it takes some air to carry the oil mist to those hard to get to places. In vacuum there is nothing to carry the oil mist droplets and they just fall down immediately because of gravity.
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September 20th, 2009, 08:52 PM   #70
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what about removing the high speed air valve from the crank vent and putting a second reed valve over this hole

http://www.husaberg.org/index.php?full= ... _photo.php

then the crankcase vacuum is retained for increased efficency, the oil pump has a more favourable pressure differential, and there is more chance that the rocker arms will get some oil mist.
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