Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: mr carl on 15 June 2011, 15:13:58

Title: need help understanding the 2.5 engine
Post by: mr carl on 15 June 2011, 15:13:58
Right a few things....

What is the multi ram all about, what does it do and why is it needed? Other cars that sport the engine don't have this?

Second is why does it have two throttles and not just one, like on the calibra and vectra?

Also I have a split hose, on the back of the intake there are four hoses making their way onto the 'ecotec' cover well the third hose from the left is split I have fixed it now but what are these breather hoses for? Or where do they lead, would this lead to loss in power?

I will probably have more questions as soon as these have been answered lol

Thanks
Title: Re: need help understanding the 2.5 engine
Post by: VR4Dave on 15 June 2011, 15:17:28
can't help with all of it but crankcase breather is explained here ftp://V6 Cleaning crankcase breather system.
Someone will be along to explain the rest  :y
Title: Re: need help understanding the 2.5 engine
Post by: mr carl on 15 June 2011, 15:26:11
For some reason it won't let me on that link :(
Title: Re: need help understanding the 2.5 engine
Post by: RobG on 15 June 2011, 15:33:02
Quote
Right a few things....

What is the multi ram all about, what does it do and why is it needed? Other cars that sport the engine don't have this?

Second is why does it have two throttles and not just one, like on the calibra and vectra?

Also I have a split hose, on the back of the intake there are four hoses making their way onto the 'ecotec' cover well the third hose from the left is split I have fixed it now but what are these breather hoses for? Or where do they lead, would this lead to loss in power?

I will probably have more questions as soon as these have been answered lol

Thanks
http://www.omegaowners.com/forum/YaBB.pl?num=1153840176
http://www.omegaowners.com/forum/YaBB.pl?num=1285583967
Title: Re: need help understanding the 2.5 engine
Post by: mr carl on 15 June 2011, 15:56:13
so the multi ram is there to spread the torque rather than have it peek?

are there any graphs to show what the torque curve is like without the multi ram? is it there to smooth the ride of the engine...the link is a bit bleek, and still doesnt really explain a aweful lot
Title: Re: need help understanding the 2.5 engine
Post by: dbug on 15 June 2011, 19:10:02
Quote
can't help with all of it but crankcase breather is explained here ftp://V6 Cleaning crankcase breather system.
Someone will be along to explain the rest  :y

Link fixed - try V6 Cleaning crankcase breather system (http://www.omegaowners.com/forum/YaBB.pl?num=1285583967)

HTH
Title: Re: need help understanding the 2.5 engine
Post by: TheBoy on 15 June 2011, 20:01:24
Remember the fuel maps assume that the multiram is there and working.

When the multiram doesn't work, as on TheDaddy's car, its flat as hell
Title: Re: need help understanding the 2.5 engine
Post by: mr carl on 15 June 2011, 21:34:20
i dont think there is anything wrong with mine, it is running fine....still cant get those rear wheels to spin up in the dry though :(

i just wondered what the hell it was lol
Title: Re: need help understanding the 2.5 engine
Post by: TheBoy on 15 June 2011, 21:57:32
The rear suspension does a decent job of keeping the rear in contact with the ground, and with good quality tyres, should grip reasonably well.

Its not like, for example, 2.0l Cortinas that would wheelspin if someone farted nearby.
Title: Re: need help understanding the 2.5 engine
Post by: dad1uk on 15 June 2011, 22:00:23
Quote
i dont think there is anything wrong with mine, it is running fine....still cant get those rear wheels to spin up in the dry though :(

i just wondered what the hell it was lol


It is a very heavy car don't forget!
Title: Re: need help understanding the 2.5 engine
Post by: Broomies Mate on 15 June 2011, 22:12:25
Quote
i dont think there is anything wrong with mine, it is running fine....still cant get those rear wheels to spin up in the dry though :(

i just wondered what the hell it was lol

Buy some LingLang/Nexen tyres.  That'll give your bum-hole a good workout at every roundabout/corner you 'negotiate' sideways/backwards.  ;D

Title: Re: need help understanding the 2.5 engine
Post by: henryd on 15 June 2011, 22:36:20
Quote
Quote
i dont think there is anything wrong with mine, it is running fine....still cant get those rear wheels to spin up in the dry though :(

i just wondered what the hell it was lol

Buy some LingLang/Nexen tyres.  That'll give your bum-hole a good workout at every roundabout/corner you 'negotiate' sideways/backwards.  ;D


PMSL ;D ;D ;D
Title: Re: need help understanding the 2.5 engine
Post by: mr carl on 16 June 2011, 08:24:50
i am guessing my fat tyres dont help much :(
Title: Re: need help understanding the 2.5 engine
Post by: VR4Dave on 16 June 2011, 08:33:47
familiar with bikes? Fit a pair of scotoilers above rear wheels  ;D ;D ;D
Title: Re: need help understanding the 2.5 engine
Post by: mr carl on 16 June 2011, 11:54:34
Quote
familiar with bikes? Fit a pair of scotoilers above rear wheels  ;D ;D ;D

lol awesome idea  8-) but no  ;D
Title: Re: need help understanding the 2.5 engine
Post by: mr carl on 19 June 2011, 16:58:27
Quote
Remember the fuel maps assume that the multiram is there and working.

When the multiram doesn't work, as on TheDaddy's car, its flat as hell

ok i think i may have been wrong about my multiram working fine.

every now and again when i plant my foot i feel a nice serge...but over the last few days it seems to have gone flat....i was driving on a round a bout the other day and put my foot down and it pulled like a train.

i done the same today and there was nothing there to get excited about, and i let my mate drive it, he is used to a 1.4 pug 306 and he did not seem to impressed either

is there a way to test if the multiram is working as it should?

it might just be how i am driving it  :-?
Title: Re: need help understanding the 2.5 engine
Post by: RobG on 19 June 2011, 18:30:17
Quote
Quote
Remember the fuel maps assume that the multiram is there and working.

When the multiram doesn't work, as on TheDaddy's car, its flat as hell

ok i think i may have been wrong about my multiram working fine.

every now and again when i plant my foot i feel a nice serge...but over the last few days it seems to have gone flat....i was driving on a round a bout the other day and put my foot down and it pulled like a train.

i done the same today and there was nothing there to get excited about, and i let my mate drive it, he is used to a 1.4 pug 306 and he did not seem to impressed either

is there a way to test if the multiram is working as it should?

it might just be how i am driving it  :-?
Blip the throttle wide open from under the bonnet and you should see it work
Title: Re: need help understanding the 2.5 engine
Post by: mr carl on 19 June 2011, 18:39:49
Quote
Quote
Quote
Remember the fuel maps assume that the multiram is there and working.

When the multiram doesn't work, as on TheDaddy's car, its flat as hell

ok i think i may have been wrong about my multiram working fine.

every now and again when i plant my foot i feel a nice serge...but over the last few days it seems to have gone flat....i was driving on a round a bout the other day and put my foot down and it pulled like a train.

i done the same today and there was nothing there to get excited about, and i let my mate drive it, he is used to a 1.4 pug 306 and he did not seem to impressed either

is there a way to test if the multiram is working as it should?

it might just be how i am driving it  :-?
Blip the throttle wide open from under the bonnet and you should see it work

what should i be looking for?
Title: Re: need help understanding the 2.5 engine
Post by: TheBoy on 19 June 2011, 19:52:51
the multiram actuators move ;)
Title: Re: need help understanding the 2.5 engine
Post by: mr carl on 19 June 2011, 19:58:39
Quote
the multiram actuators move ;)

ok so actuators moving= working

do they ever fail intermitantly? as i notice some times i drive that car it feels flat, while other times it pulles like i am being taken by the gravitational pull of the moon
Title: Re: need help understanding the 2.5 engine
Post by: TheBoy on 19 June 2011, 20:31:41
Quote
Quote
the multiram actuators move ;)

ok so actuators moving= working

do they ever fail intermitantly? as i notice some times i drive that car it feels flat, while other times it pulles like i am being taken by the gravitational pull of the moon

If they are intermittent, I'd suggest checking over the vac system, particularly the one way valves in the vac system (each vac reservoir has a built in one way walve which frequently fails).  If an idiot has previously worked on the engine, check the vac is connected up properly - you'd be surprised how many are wrong.



Obviously, its a heavy RWD car. If you have good quality wide tyres, an autobox, well maintained suspension and 'only' 170ish bhp, you're not gonna light up the tyres like a FWD chavalier or calibra. Thankfully.