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Old 07-13-2004, 18:48   #1 (permalink)
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Manifolds

Is there any DYNO proven advantage from changing from the droopy ea/ed manifold to the ef manifold. Ive heard the ef ones are better for low end, but the Ea-EB ones are heaps better for top end pull.
I can get these manifolds easy as ,just woundering weather it would be woth the effort to change.
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Old 07-13-2004, 19:03   #2 (permalink)
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Re: Manifolds

EF one for low end torque
ED one for top end power
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Old 07-13-2004, 19:07   #3 (permalink)
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Re: Manifolds

sweet, so if you cam a motor up, which shifts it power range to top end, then the ED one is the one to stay with...

Is it true the ed ones have bigger runners than ea-eb
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Old 07-13-2004, 19:14   #4 (permalink)
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Re: Manifolds

Yeah, i've heard the ED ones are the best...
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Old 07-13-2004, 19:35   #5 (permalink)
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Re: Manifolds

What about EB2 4.0's, do they have the same runners as the ED jobbies? I would have thought they were the same being 4.0 litres?

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Old 07-13-2004, 19:37   #6 (permalink)
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Re: Manifolds

im pretty sure they went to a thicker runner some where between eb-ed
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Old 07-13-2004, 19:46   #7 (permalink)
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Re: Manifolds

They have the same part number from EB-ED and through to XH aswell...
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Old 07-13-2004, 20:00   #8 (permalink)
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Re: Manifolds

so the ea ones were smaller
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Old 07-13-2004, 21:38   #9 (permalink)
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Re: Manifolds

if running a cammed up motor wouldnt the EF/L manifold make more sense to get back some of the low end that you lose with the cam?
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Old 07-13-2004, 21:49   #10 (permalink)
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Re: Manifolds

when building motors, i figure u carnt have it all.


With The 250 crossflow i built i used an ed manifold, cut down to shorten the runners, and welded to an xf injection manifold. With wild cam, over 260 @0.050 and 560 lift, low in the rev range it made nothing , but at 5500 made 300 hp (220 kw and at 430 nm at 3900. If i used a longer runner manifold, i wouldnt of gained that much power down low, and it would of killed the engines top end pull.

I figure u design cam/manifold/head to all work at the same rpm range, that way when u hit that range all hell breaks loose
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