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BBM butterfly assembly only opening at 85%??? 

 

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Posted: Sat Mar 29, 2008 8:40 pm 
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cboz wrote:
grub73 wrote:
Quote:
I also cut the shaft that holds the valves' it's in 2 pieces and the valve slots between, I left the side with the thread for the screw


I probably wouldn't have thinned the shaft that way, IMO it may have weakened the shaft too much, if the shaft lets go then you could end up with BBM blades/valves loose in the intake and possibly in your engine, Jamming your valves and stuffing your head.


There's no chance of it breaking it's very strong material and the screw thread is retained. Though must say it's alot of labour for what I think would be a small gain, hoping to gain a little bit by doing this along with cutting the gasket to size which is pretty rough and fully opening the valves. Cheers I hand the thread back to it's owner after my little hi-jack, lol.


cheers,

post up your results when finished, good to see you will open up the butterfly valves the full 100%. Will make the most of your BBM mods..

 

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Posted: Sat Mar 29, 2008 9:01 pm 
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whilst i understand those drawings might not be 100% accurate, it appears to me (who knows nothing about physics) that the slight angle would encourage the air to travel around the bend rather than straight on to obstruct the outside line air...

 

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Posted: Sat Mar 29, 2008 10:10 pm 
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SgtBourne wrote:
whilst i understand those drawings might not be 100% accurate, it appears to me (who knows nothing about physics) that the slight angle would encourage the air to travel around the bend rather than straight on to obstruct the outside line air...




A fully open valve blade will outflow a partially open valve blade. Have a look at this pic of an opened BBM.

Image

 

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97 EL Fairmont 4l OHC .Silver.
Exhaust: Pacemaker's, 2.5" exhaust and Hiflow cat
Intake: FRAM AIRHOG , EL GT snorkel
XR6 300kpa fuel reg Stg 2 Auto Shift Kit.6DJA ECU
PM in Qld looking too buy Toyota 4*4 SR5 Dualcab Hilux 91-97 with 2.8l diesel engine/5spd manual

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Posted: Sun Mar 30, 2008 5:29 pm 
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link to another thread about the same mod!!

http://www.fordforums.com.au/showthread ... ge=1&pp=25

 

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97 EL Fairmont 4l OHC .Silver.
Exhaust: Pacemaker's, 2.5" exhaust and Hiflow cat
Intake: FRAM AIRHOG , EL GT snorkel
XR6 300kpa fuel reg Stg 2 Auto Shift Kit.6DJA ECU
PM in Qld looking too buy Toyota 4*4 SR5 Dualcab Hilux 91-97 with 2.8l diesel engine/5spd manual

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Posted: Sun Mar 30, 2008 6:10 pm 
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well there you go, thats the thread i started
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Posted: Sun Mar 30, 2008 7:18 pm 
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Do you guys know the diameter of the short runner butterflies and long runner manifold port.?

 

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Posted: Thu Apr 03, 2008 4:45 pm 
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Looks like no one knows.

 

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Posted: Thu Apr 03, 2008 8:52 pm 
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manifold port is 40mm, sorry but dont want to pull apart my spare bbm at the moment to check butterfly blades. From a quick look though they look a little smaller, maybe 37-38 mm?? Will check when i have some more time (and a clean workbench :oops:)

 

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Posted: Fri Apr 04, 2008 10:29 am 
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Shoulda checked mine while it was out, though the butterfly blades are only very marginally smaller than the ports, they are a neat fit.
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Posted: Fri Apr 04, 2008 5:19 pm 
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Thanks guys..that is great info!!:)

 

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