Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: ngrainqey on 13 October 2008, 22:35:34
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hiya, im after some vectra rocker covers for the 2.5 as they're supposed to be alot better, how true is this?
thanks
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not very true apparently:
http://www.omegaowners.com/forum/YaBB.pl?num=1220205721/0
:-/
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but if you still want some :
http://cgi.ebay.co.uk/VECTRA-V6-ROCKER-COVERS-2-5-GSI-SRI-CDX_W0QQitemZ170271281561QQcmdZViewItem?hash=item170271281561&_trkparms=72%3A1301%7C39%3A1%7C66%3A2%7C65%3A12%7C240%3A1318&_trksid=p3286.c0.m14
;)
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thanks for the info and link matey...
might still get some to make the engine look a bit nicer :)
thought they'd be quite a bit better and stronger/less prone to cracking or breaking
thanks
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thanks for the info and link matey...
might still get some to make the engine look a bit nicer :)
thought they'd be quite a bit better and stronger/less prone to cracking or breaking
thanks
yeah i still think they'd do a better job than the plastic ones as long as you keep the breathers clear :)
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thanks for the info and link matey...
might still get some to make the engine look a bit nicer :)
thought they'd be quite a bit better and stronger/less prone to cracking or breaking
thanks
yeah i still think they'd do a better job than the plastic ones as long as you keep the breathers clear :)
yeah okie dokie then *rubs hands together with tongue out* haha!
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apparantly not a good idea, the plastic omega covers act as a pressure release valve if the breathers block, the metal vectra jobs dont give at all so if breathers block it blows the crank seal instead. Makes you wonder if the breather system is better on the vectra? Anyway, up to you, but its alot easier changing the cam cover gaskits than the crank seal, intake off, aux belt off,bottom pulley off, cam belt off, presume toothed cam belt wheel off the crank, then i guess you can start on the seal? Your car tho.
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thanks for the info and link matey...
might still get some to make the engine look a bit nicer :)
thought they'd be quite a bit better and stronger/less prone to cracking or breaking
thanks
yeah i still think they'd do a better job than the plastic ones as long as you keep the breathers clear :)
yeah okie dokie then *rubs hands together with tongue out* haha!
::)
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apparantly not a good idea, the plastic omega covers act as a pressure release valve if the breathers block, the metal vectra jobs dont give at all so if breathers block it blows the crank seal instead. Makes you wonder if the breather system is better on the vectra? Anyway, up to you, but its alot easier changing the cam cover gaskits than the crank seal, intake off, aux belt off,bottom pulley off, cam belt off, presume toothed cam belt wheel off the crank, then i guess you can start on the seal? Your car tho.
The breather system is the same.......and its not uncommon to find oil spewing from the crank seal etc on the vectra!
Reality is that the bretaher setup is very good on the V6 and works very well if the engine is PROPERLY serviced!
Subsequently...the cam cover seals also last well under such conditions!
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yep. but have seen posts, people regularly clean breathers and still blow cam covers, really dont see the point unless your showing the car. Or the seals have gone already, why dislodge perfectly good cam seals? Having said that they would look nice polished up, until the winter salt gets on them. Pays your money, makes your choice...
Daw, mark beat me to it, should have used quotes...
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yep. but have seen posts, people regularly clean breathers and still blow cam covers, really dont see the point unless your showing the car. Or the seals have gone already, why dislodge perfectly good cam seals? Having said that they would look nice polished up, until the winter salt gets on them. Pays your money, makes your choice...
I would possibly agree with IF the said people had owned the car from new and following the regime from new....
e.g, my facelift I owned from 19K miles.....and its still on the original seals with no issues at all and the brathers are checked every year but never require cleaning!
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while your on Mark, on a race bike similar youd junk the breather system and blank off the outlet holes in the cam covers, minimal crank case pressure As it serves no purpose other than emissions, and pumping the oil vapour through the air box. Always wondered, if the breather system only0exists for emissions, if there is a way to vent crank case pressure to separate system or catch tank/bottle that does not feed the intake or block the system, there by not blow the cover seals.?
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while your on Mark, on a race bike similar youd junk the breather system and blank off the outlet holes in the cam covers, minimal crank case pressure As it serves no purpose other than emissions, and pumping the oil vapour through the air box. Always wondered, if the breather system only0exists for emissions, if there is a way to vent crank case pressure to separate system or catch tank/bottle that does not feed the intake or block the system, there by not blow the cover seals.?
Things to consider:
1) The breather system keeps the crank case at a slight negative pressure
2) It DOES work well if maintained
3) You cant vent to atmosphere as that is an MOT failure!
You could use a catch tank but, the crank case will not vent as well because its no longer at a slight vaccum.
Remember that ALL piston engines have blow by gases so will need the crank case venting in some way.....you probably dont care on a race engine as it will be binned after one outing!
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lol the veccy rocker covers would look very nice polished up ;)
i was interested because of the fact the omega ones look so lame!
might get some might not-have to decide lol. if i could be arsed with new gaskets then i spose i could take it off every so often to swap it between the two - say placy for winter and aluminium for summer(probs cant be arsed though)
thanks for the info anyway, didnt know about the placy acting as a pressure release kinda of thing, whats to stop you fitting a pressure release valve on say the side of the cover? (i know i'm getting complicated and it's faffing and also it'd probably get clogged up)
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apparantly not a good idea, the plastic omega covers act as a pressure release valve if the breathers block, the metal vectra jobs dont give at all so if breathers block it blows the crank seal instead. Makes you wonder if the breather system is better on the vectra? Anyway, up to you, but its alot easier changing the cam cover gaskits than the crank seal, intake off, aux belt off,bottom pulley off, cam belt off, presume toothed cam belt wheel off the crank, then i guess you can start on the seal? Your car tho.
Vectra B 2.5 V6s Eat Crankseals strange that! around 110k the rear crankseal goes thus contaminating the clutch and then the clutch slips! and then you buy a 3.0 MV6 and live happily ever after
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while your on Mark, on a race bike similar youd junk the breather system and blank off the outlet holes in the cam covers, minimal crank case pressure As it serves no purpose other than emissions, and pumping the oil vapour through the air box. Always wondered, if the breather system only0exists for emissions, if there is a way to vent crank case pressure to separate system or catch tank/bottle that does not feed the intake or block the system, there by not blow the cover seals.?
Chris, what you have to bear in mind with race engines is that they operate huge pressures compared with normal engines, which are designed for longevity / durability and minimal warranty claims!
Lets use an example - Suzuki GSXR 750WT TL1000R Kit and Ducati Corsa.
The psitons on the works engines or any race engine for that matter are designed for maximum efficiency and minimal weight, now what that means is that the piston normally has one ring as opposed to three due to it's skirt being so small, which is why, in the case of the Ducati, and the TL the breather systems are enlarged - standard breather bore 10-15mm with one way reeds - works spec bore - 25mm with open vent.
The normal working compression of works engines is around 13:1, and the motogp and F1 stuff even higher, which is why the buggers won't idle at anything less than 4k!
Also on a race engine remember that all fluid systems have to be hemetic, as to say if the car or bike shits itself it must attempt to keep spillage to a minimum - hence the breather tanks are huge under the seat units, Ducati's Corse crankcase breather tank was around three plus litres in capacity and was baffled in order to allow the oil to return as mist through whence it came!
The F1 engines also vent into a baffled catch tank, and the oil mist returns via the oil filter. The whole venting to atmosphere is a hotrodder's thaang! ; if you ran a racebike vented to atmosphere, when that bike goes down you've just dumped the contents of the sump all over the track - definite no-no, which is why race vehicles aren't allowed to run coolant and have to use water.
The race engine breather system still manages to keep pressures in the engine constant as Mark says, but it does it by effectively freeing the breathing system to be fully open, however the pressures allowed this whereas Mr Ducati 998 owner who just bought a corse exhaust breather and catchtank for his standard roadbike suddenly finds the torque curve is bugger all at anything other than 6k or above!
Essentially because the engine now breathes more freely, but the pressures are lower due to the fact that the now it's breathing too freely- and suddenly the so called tuner tells mr moneyed duke owner that he needs corse eproms cams and pistons (which of corse are high compression so the rods'll have to be changed) !
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my old mig had done 47k and had NEVER had the cam cover gaskets done but it had been serviced once a year so proves really that its all to do with the breathers and good maintenence!!