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another bbm problem(repost) 

 

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 Post subject: another bbm problem(repost)
Posted: Thu Nov 16, 2006 6:53 pm 
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hi again
iv accidently posted this in the x series forum so i have reposted it here.. sorry....

i put the bbm on my ea today and i have a problem with the car only running on 5 cyl and every 10 or 20 seconds a pop out the exhaust which tells me that the plugs are firing and i tested the injectors and they are all getting power and using a screwdriver as a stethascope (putting handle to my ear and point on injector)they are all ticking..

could it be one blocked injector..
or possibly a sad plug lead....

also when the bbm has no vacuum is it on the short or long runners????
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Posted: Thu Nov 16, 2006 6:58 pm 
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update...

ive fixed the problem it was blocked injectors i just swapped the ones that were on me log manifold..

the car has so much response now.. 2 dark black lines out the front of my house dont lie..........

but it needs the bbm switch to be connected ..
as it seems to run out of puff after 4000rpm
i still dont know what the manifold is switched to when it has no vacuum..
as that is how it is at the moment...
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Posted: Thu Nov 16, 2006 9:25 pm 
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BUMP..

cmon guys can someone please tell me what position the bbm is in when it has no vacuum..
short? or long?

and is the short runner for high rpm or low..

sorry for the stupid question. but ive never played around with the bbm before..
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Posted: Thu Nov 16, 2006 9:29 pm 
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as far as i'm aware its in long position below 3000rpm and short above 3000

 

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Posted: Thu Nov 16, 2006 9:31 pm 
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so i think vacuum is turned on by the vacuum solenoid when it gets above 3000rpm.

 

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Posted: Thu Nov 16, 2006 9:51 pm 
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http://www.fordmods.com/forums/viewtopi ... utterflies

That thread has the answer, comfirms what I was sure I remembered.

When engine is off or no vacuum, the butterflies are OPEN, so short runners.
Engine starts, butterlifes close under vacuum for long runners, till 3800rpm obviously.

 

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Posted: Thu Nov 16, 2006 10:04 pm 
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Steady ED wrote:
http://www.fordmods.com/forums/viewtopic.php?t=35822&highlight=bbm+butterflies

That thread has the answer, comfirms what I was sure I remembered.

When engine is off or no vacuum, the butterflies are OPEN, so short runners.
Engine starts, butterlifes close under vacuum for long runners, till 3800rpm obviously.


i think its the other way around. you need short runners above 3800rpm so u can get more air. the long runners are used below 3800rpm to improve torque. the manifold is controlled by a solenoid not vacuum from the engine.

 

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Posted: Thu Nov 16, 2006 10:09 pm 
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bluecube wrote:
Steady ED wrote:
http://www.fordmods.com/forums/viewtopic.php?t=35822&highlight=bbm+butterflies

That thread has the answer, comfirms what I was sure I remembered.

When engine is off or no vacuum, the butterflies are OPEN, so short runners.
Engine starts, butterlifes close under vacuum for long runners, till 3800rpm obviously.


i think its the other way around. you need short runners above 3800rpm so u can get more air. the long runners are used below 3800rpm to improve torque. the manifold is controlled by a solenoid not vacuum from the engine.

You read that thread dude?
When you take the top half off a BBM, the butterflies are open.
The butterflies when closed block off the SHORT path in the BBM, forcing air to take the long runners.
Hit 3800 and the short path opens, allowing air to take BOTH paths, but primarily the shorter.

 

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Posted: Thu Nov 16, 2006 10:09 pm 
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Quote:
the manifold is controlled by a solenoid not vacuum from the engine.


However the solenoid allows engine vacuum to the BB switch to move the butterflies.

 

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Posted: Thu Nov 16, 2006 10:15 pm 
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Steady ED wrote:
bluecube wrote:
Steady ED wrote:
http://www.fordmods.com/forums/viewtopic.php?t=35822&highlight=bbm+butterflies

That thread has the answer, comfirms what I was sure I remembered.

When engine is off or no vacuum, the butterflies are OPEN, so short runners.
Engine starts, butterlifes close under vacuum for long runners, till 3800rpm obviously.


i think its the other way around. you need short runners above 3800rpm so u can get more air. the long runners are used below 3800rpm to improve torque. the manifold is controlled by a solenoid not vacuum from the engine.

You read that thread dude?
When you take the top half off a BBM, the butterflies are open.
The butterflies when closed block off the SHORT path in the BBM, forcing air to take the long runners.
Hit 3800 and the short path opens, allowing air to take BOTH paths, but primarily the shorter.


dude you just repeated exactly what i said

 

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Posted: Thu Nov 16, 2006 10:16 pm 
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just so everyone is clear

 

 

Attachments:
bbm.jpg
bbm.jpg [ 68.63 KiB | Viewed 38 times ]

 

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Posted: Fri Nov 17, 2006 6:52 am 
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thaks guys

that means that mine is curently open and is using the short path...
which should be for high rpm..

but when driving the car it runs out of puff about 4000rpm

i will try to conect the switch today and see how it goes....
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Posted: Fri Nov 17, 2006 11:12 am 
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ok
i switched the runners over to the short path and as i was told it does ping
but i will try to get a el ecu to overcome that problem..

next question is where does the vacuum lines go on the solinoid???

here is a pic

 

 

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bbm 004.jpg
bbm 004.jpg [ 139.82 KiB | Viewed 25 times ]
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Posted: Fri Nov 17, 2006 7:37 pm 
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BUMP

i really need help with the vac lines on this bbm switch..
please..
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Posted: Fri Nov 17, 2006 8:20 pm 
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Just had a look under my bonnet. 1 big one goes at the manifold. The other large one goes to the vac tank. 1 small one goes to the heater control on heater hose under manifold. Last small one goes to butterfly switch at the front of manifold.
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