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EF BBM & CAM 

 

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 Post subject: EF BBM & CAM
Posted: Sun Jun 18, 2006 11:24 pm 
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Does anyone know if the EF-EF BBM offers any power advantages over the EA-ED Inlet manifold? Or does it only increase bottom end torque.
Also does anyone have cam specs on the various cams offered from EA CPI & MPFI through to EF-EL 2:1 rocker ratio cams? Reason is that Im wondering if there would be any advantage in dropping a stock EF cam into my EB II? I read on the JMM website that EB's had a meatier cam that EDs, and that the difference in power was noticeable.

 

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Posted: Mon Jun 19, 2006 10:41 pm 
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bump...

 

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Posted: Mon Jun 19, 2006 10:44 pm 
Getting Side Ways
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There's plenty of comments regarding this, but the bottom line is that there have been proven results that show that the EF manifold will increase power and torque on pre-EF cars.

First I've heard about the EB cam being "meatier" than the ED cam? Did JMM tell you this direct or is it hear say? It'd be interesting to find out for sure.

Are you going to install the cam yourself or pay someone to do it?
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Posted: Mon Jun 19, 2006 11:01 pm 
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Regarding the cam, its in one of the magazine articles hosted on the JMM website. Im wondering if the EF has a meatier cam than the EB, as the EF's did pick up on power quite a bit compared to the ED. Vs. the XR6 Which only Gained 4kw(?). Another thing I found interesting in the Crow cams catalogue is:
002 - High Torque cam to suit EA-ED
825 - Mild Performance cam to suit EA-ED
2549 - Medium Performance cam to suit EA-ED
2519 - Mild Performance cam EF-EL

Does the EF-EF have a better cam to start with...
Another thing I have noticed is that the EB cam has more duration on the inlet vs. the AU cam which has more exhaust duration.
EB 241/239 114LCA
AU 233/246 119LCA
Is this due to the fact that the broadband manifold flows that much more than the early manifold, so the inlet duration could be reduced, and more exhaust duration to reduce pumping losses?
The AU cam also has MUCH wider LCAs...

 

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Posted: Mon Jun 19, 2006 11:03 pm 
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http://www.crowcams.com.au/templates/Catalogue-Falcon6EA-AU-OHC.shtml
and
http://www.crowcams.com.au/templates/Catalogue-Profiles-HoldenV8LS1-Ford-OHC.shtml
and lastly
http://www.jimmockmotorsport.com/html/articles.php

 

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Last edited by balizticbobo on Mon Jun 19, 2006 11:14 pm, edited 1 time in total.

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Posted: Mon Jun 19, 2006 11:09 pm 
Getting Side Ways
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For techy stuff like that, ask "4.9 EF Futura" (there are a couple of others, but he's is the only name I can remember..)

My 2 cents: If your going to pay someone else to do the install, don't bother with a stock Falcon cam. I've got a mate whose been there and tried that and it was a waste of money. He tried an XR6 cam in his EF and he said he couldn't detect any difference. Don't know about going from EF to EB though...Would have been better off paying a little more for a DEV3HL or DEV5. At least that way you know your definantly going to get some good power gains.
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Posted: Mon Jun 19, 2006 11:28 pm 
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Nope I wouldn't pay anyone else to work on my cars when I could do it myself!
When I get the chance I'll measure the lift on the EB vs. EF cams and post it up. Duration would be a bit tricky at this stage as i don't have one of those Big degree wheels yet...
Read "Treat - Street Machine Fords" you'll find it under the JMM link.
Quote:
Here's the broadband (snail shell) inlet manifold split in half. With the butterflies closed, the manifold is a longer runner-style as the incoming air must go all the way around the loop (snail shell). This is done to improve low-end torque. As revs rise, top end power is improved by opening the butterflies allowing the air to bypass the snail shell section dramatically reducing runner length. It's a good thing and can be retrofitted to the earlier EA-ED engines, but re-tuning is needed on these engines to regain correct fuel and spark. Except a 10-22kW gain by adopting this newer manifold and the accompanying cam.

 

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Posted: Fri Jun 23, 2006 8:31 pm 
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Found some cam specs:
STD EB ADV Duration-241/239, Lift .470/.454
STD EF ADV Duration-264/260, Lift .470/.454
XR6 EF ADV Duration-264/260, Lift .470/.454
The STD EF cam is bigger in terms of duration but has the same valve lift.
The only differences between the STD EF cam and the XR6 cam are the valve timings.
STD EF
Inlet opens 16BTDC, closes 68ABDC
Exhaust opens 62BBDC, closes 18ATDC
XR6 EF
Inlet opens 14BTDC, closes 70ABDC
Exhaust opens 58BBDC, closes 22ATDC
So if you look at these specs you can see that the Xr6 Cam is retarded by 2 degrees over the STD cam, with the exhaust profile retarded a further 2 degrees. Because of this, the overlap increases from 34 to 36 degrees, and the lobe seperation angle has been tightened up from 114 to 113.
Perhas this cam was designed to take advantage of the better flowing exhaust port of the XR heads..?

 

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Posted: Fri Jun 23, 2006 11:04 pm 
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balizticbobo wrote:
Found some cam specs:
STD EB ADV Duration-241/239, Lift .470/.454
STD EF ADV Duration-264/260, Lift .470/.454
XR6 EF ADV Duration-264/260, Lift .470/.454
The STD EF cam is bigger in terms of duration but has the same valve lift.
The only differences between the STD EF cam and the XR6 cam are the valve timings.
STD EF
Inlet opens 16BTDC, closes 68ABDC
Exhaust opens 62BBDC, closes 18ATDC
XR6 EF
Inlet opens 14BTDC, closes 70ABDC
Exhaust opens 58BBDC, closes 22ATDC
So if you look at these specs you can see that the Xr6 Cam is retarded by 2 degrees over the STD cam, with the exhaust profile retarded a further 2 degrees. Because of this, the overlap increases from 34 to 36 degrees, and the lobe seperation angle has been tightened up from 114 to 113.
Perhas this cam was designed to take advantage of the better flowing exhaust port of the XR heads..?


That's bloody awesome information. Thanks mate. Now I can see why an XR6 cam would make no difference to a stock EF. Nice work. :D Thanks.
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