[Land-speed] Intake Manifold Question(s)

[dan warner]

I had the opportunity to look at a set of stock high performance heads that
had 
just come off of a CNC porting machine on Friday. I was interested that
the port 
runners were not modified the total length. The porting machine
had hit the high 
spots only, the runners were still 'as cast' in some spots
and machined in 
others.

Wonderful things are happening,
DW
 
To: drmayf at mayfco.com; land-speed at autox.team.net
Sent: Sun, June 5, 2011
9:24:57 AM
Subject: Re: [Land-speed] Intake Manifold Question(s)

36 to no
finer than 60 grit is just fine.
You will be hard pressed to build a 200 cu in
plenum...
10 X 5 X 4 =200 and will not reach the end runners very well.
-----
Original Message ----- From: "Larry Mayfield" <drmayf at mayfco.com>
To:
<land-speed at autox.team.net>
Sent: Sunday, June 05, 2011 11:48 AM
Subject:
[Land-speed] Intake Manifold Question(s)


> Ok, those of you who consider me
a crank can hit delete now, lol....
> 
> I am making or revising an old
manifold for use on the Sunbeam. I notice that 
>the runners are pretty dog
gone rough and I want to do port matching and 
>polishing.  My questions have
to do with the smoothness of the air flow in the 
>runners.  This is an EFI
manifold so it is what I would call dry. No fuel in the 
>manifold. So do I
want a really smooth runner wall or rough? If smooth just how 
>smooth? Should
I have it extrude honed for smoothness and removal of any small 
>turbulence
generators? If really smooth would coating the runner walls with 
>glyptol be
a good thing? That stuff drys to a hard finish and is pretty slippery 
>and
dang near impervious to oils and anything else.
> 
> The manifold will be a
short runner box with a plenum about 2/3 size of the 
>engine displacement (an
old rule of thumb I once heard and maybe be invalid) for 
>use with my HP72
turbo(s).
> 
> Thoughts, comments, ideas? I'll listen to them all....
> 
>
Just going to try and increase the Sunbeams speed over the old first Sunbeam
>top speed.  Class record speeds are way beyond my capabilities and pockets,
>lol...
> 
> -- 
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