[Land-speed] Intake Manifold Question(s)

Larry Mayfield drmayf at mayfco.com
Sun Jun 5 09:48:39 MDT 2011


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...

-- 
______________________________
drmayf
Worlds Fastest Sunbeam, period.
204.913 mph flying mile
210.779 mph exit speed


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