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Old 02-17-2005, 17:09   #1 (permalink)
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Inlet Manifold - match porting

Hi,

I have a new Weiand Xcelerator that I was going to fit to my mild 351, 2V heads fitted with 4v valves, etc.

Is there any gain in port matching the manifold to the heads ? I didn't want to go to far but a simply alignment and cleanup.

thanks
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Old 02-17-2005, 19:11   #2 (permalink)
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Re: Inlet Manifold - match porting

You'll more than likely find the weiand port is larger than the 2V head anyway. I've honestly never match ported any of my V8's to date as the gains are minimal and sometimes none at all. I've match ported a 4cyl I built but hey it was a gutless 4cyl compared to any of my v8's

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Old 02-17-2005, 20:08   #3 (permalink)
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Re: Inlet Manifold - match porting

thanks, I'm going to pull my manifold off tonight and will check the port size. I've just been reading the spec's on your car....you are getting some quick times.
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Old 02-18-2005, 01:01   #4 (permalink)
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Re: Inlet Manifold - match porting

I agree. I ran 12:20s regularly with a x-cellerator & 700dp. There is very little gain for dollars spent with match porting. Mine wasn't matched ported because the manifold was same size as intake port. Not hard to run good numbers with a basic combo.
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Old 02-18-2005, 01:19   #5 (permalink)
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Re: Inlet Manifold - match porting

How would you guys think a 2V Xcellerator manifold work if it was modified and match ported to 4V heads?? Better or worse than a 4V version?
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Old 02-18-2005, 17:03   #6 (permalink)
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Re: Inlet Manifold - match porting

Quote:
Originally Posted by 4Vman
How would you guys think a 2V Xcellerator manifold work if it was modified and match ported to 4V heads?? Better or worse than a 4V version?
I ve often wondered. Since the 2v weiand ports are quite big, it may work good. Higher airspeed??
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Old 02-18-2005, 17:15   #7 (permalink)
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Re: Inlet Manifold - match porting

I'd think xdclevo's thoughts would be correct. It all helps and the 2V manifold port is almost 4V anyway.
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Old 02-18-2005, 20:35   #8 (permalink)
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Re: Inlet Manifold - match porting

thanks guys.....any comments on spacer plates between the carb and manifold...I've always thought no more than 1" was the way to go.
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Old 02-18-2005, 20:40   #9 (permalink)
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Re: Inlet Manifold - match porting

You have have to do your own dyno testing to see whether your engine likes it. The most I've seen is an extra 15rwkw and more torque gained. The basic principle is the spacer makes the engine think the carb is larger.

I ran a spacer ontop of my weiand and it worked well for my setup. The new setup has no spacer but will be tested if time allows.

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Old 02-22-2005, 15:26   #10 (permalink)
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Re: Inlet Manifold - match porting

Finally got around to checking my ports and have discovered that the previous owner that matched the heads to the existing x-ellarator manifold, but had not touched the manifold its self....my reason for the change to the new weiand was I got my hands on a new fully polished unit.
Decided to fit a 1/2" spacer and see how it goes.... oh yeh it only took 5 hours to polish the spacer to match the manifold......won't be doing that again in a hurry.
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