Yeh i was hoping someone would just have one sitting in the shed i could buy... hence the thread in the wanted section, but i guess ill just have to fork out the $175.
A1
Engine breathing question..
Started by
_draglc_
, Mar 14 2006 08:47 AM
32 replies to this topic
#27
_HB1200_
_HB1200_
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Posted 16 March 2006 - 11:12 PM
I had the same problem when using an aftermarket chrome rocker cover (with baffle plates). I solved the problem by installing a standard Holden 2 hole cover. The one where the rear hole is on a slightly raised mound. Comparing the baffling, the Holden cover has a longer baffle with the addition of a small cup directly beneath the opening. The chrome cover has a smaller baffle plate with louvers directly beneath the opening. I have rollers as well, all I did was silicone 2 cork gaskets together. It works for my cam/roller setup.
#28
_Lostit_
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Posted 17 March 2006 - 09:19 AM
leak down test and hope you still got warranty on it .
Unless you making high comp, and even then you shouldnt get large amounts of blow back... motors are vaccums not compressors when they are waorking properly.
Unless you making high comp, and even then you shouldnt get large amounts of blow back... motors are vaccums not compressors when they are waorking properly.
#29
_draglc_
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Posted 17 March 2006 - 11:15 AM
The engine is only 3 weeks old.. so yeh i got warranty. It has black rings in it, which run in a lot easier than chrome ones. It also has 180 comp over all cyls, so im not too worried, im pretty sure its just the small rocker cover with crap baffles, so ive ordered my tall alloy one, and when it gets here ill let you guys know how i go.
Cheers for all the help and advice.
A1
Cheers for all the help and advice.
A1
#30
_draglc_
_draglc_
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Posted 27 March 2006 - 08:23 PM
got the new rocker cover tonight, will put it on tomorrow, noticed it doesnt have any baffles under the pcv and oil filler holes? it came with a thin piece of steel, am i supposed to put that in it?
casting looks a bit dodge too..
its a KC alloy one.
any thoughts?
A1
casting looks a bit dodge too..
its a KC alloy one.
any thoughts?
A1
#31
Struggler
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Posted 27 March 2006 - 08:44 PM
That thin piece of steel is the baffle.
I would definately fit it under the PCV hole.
I would definately fit it under the PCV hole.
#32
turbotrana
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Posted 29 March 2006 - 12:44 PM
Dont expect a standard breather system to work on a modified motor. Any modified motor needs a larger breather system. When I had my XU1 engine I always thought I had a rear oil main leak. It was never the rear seal. It was the pressure build up in the engine (@7000rpm) forcing oil out of the rocker cover. For my turbo 202 I have two one inch breather holes welded onto the side of the lifter gallery plates that lead with hoses to a specially made catchcan with extensive breather baffles and stainless steel wool. It is set up so that when the car sits any excess oil drains back into the engine by itself. The engine does not leak oil despite thrashing over the years.
Dont think that its your rings. Although they might blow by a little I have found the proper way to address it is to build a good breathe system.
I have even built breather systems on badly worn motors to stop the excessive crankcase vapours fouling the sparkplugs. Its a worthwhile thing to do for an engine
Dont think that its your rings. Although they might blow by a little I have found the proper way to address it is to build a good breathe system.
I have even built breather systems on badly worn motors to stop the excessive crankcase vapours fouling the sparkplugs. Its a worthwhile thing to do for an engine
#33
micklx
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Posted 29 March 2006 - 07:33 PM
It seems like people are talking about 2 different issues here,
1. Too much oil in the rocker cover, caused usually by high revs and/or HV oil pump
2. Blowby, which is too much pressure in the engine usually caused by exhaust gases getting past the rings and pressurising the sump and also top end.
When I took my Commodore to Phillip Island recently I had the standard V8 rocker covers with the breathers feeding into a catch tank. After 3 laps, i had 2 litres of oil in the tank (which doesn't leave much in the sump).
I'm planning on moving the breathers to the top of the rocker covers so the oil doesn't rush there under brakes/acceleration.
1. Too much oil in the rocker cover, caused usually by high revs and/or HV oil pump
2. Blowby, which is too much pressure in the engine usually caused by exhaust gases getting past the rings and pressurising the sump and also top end.
When I took my Commodore to Phillip Island recently I had the standard V8 rocker covers with the breathers feeding into a catch tank. After 3 laps, i had 2 litres of oil in the tank (which doesn't leave much in the sump).
I'm planning on moving the breathers to the top of the rocker covers so the oil doesn't rush there under brakes/acceleration.
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