Neal-I have really enjoyed reading about the victories and defeats. I got beat by a Yellow Prowler when I just had the chip, exhaust, and K&N. He was an Old guy, like Me, going through his change of life and we ended up next to each other at a light with nothing better to do. I am really looking for him now because I am sure it will be different. You are probably right, on my hopes being too optimistic at the 1/4 but it sure gives me something to shoot at. I forgot to pull the tube off my BBK yesterday to check out the shaft. I will try to get that done today. I will be entering my first local show tonight, weather permitting.
Good Luck!

 

Neal-I checked out the butter fly shaft on the BBK and it is flattened on both sides. It could be further improved by eleminating the round head screws and replacing them with flush ones. Hope this helps.

 

I believe porting is definitely in order when you go with a larger TB. It will work regardless of what engine you have. If the ID of the adapter is larger than the opening, you can port (gasket-matched) at a 90 deg angle. There are two schools of thought here. One states you should mirror polish the ID to allow smooth flow. The other states you want to keep the ID rough to cause intake charge agitation.

The latter is generally accepted when using a wet plenum intake (carburated). For example: a rough surface helps atomize fuel, and Extrude-honing works well with port fuel injection, because only air is moving through it. If you decide to do the entire intake, remember the stock plenum is phenolic.

When using a blower, agitation takes place in the blower. I would be more concerned with the inlet and the outlet of the adapter than the walls. I consider the "micro" effect (radiusing the mating edges) before the "Macro" effect (polishing the entire ID) when dealing with airflow.

Just my $.02

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[This message has been edited by crash1 (edited 11-13-2000).]

 

Hi,

Have stumbled onto your thread while searching the web for info on porting eaton m90 superchargers.

I have two of these on the way across from the US which I will be installing on my falcon ( I know its not a F150 but seems people actually know what they're talking about on this forum).

What I am searching for info on is porting of the blower intake and exhaust ports. After seeing that this is succesfully done by several companies over there I am planning on doing this before I make any of my manifolding to adapt these to my engine.

Can anyone shed any light on this for me or point me in the right direction.


P.S. After reading the thread on polishing versus rough finish intakes, heres what I know:-

polished walls will tend to attract fuel condensation this is due to the lack of turbulence on walls letting fuel which doesn't actually vapourise only 'atomised' into tiny drops in the inlet charge. This doesn't really rob engine of much fuel but will introduce a stream of liquid fuel into the combustion chamber which will not combust properly.

Out of interest aeronautical piston engines use polished exhaust ports and rough inlets due to this problem. I did some research before porting a few of my own heads over the years and came across this point many times from different sources.

In a modern fuel injected engine however the injectors are right next to the head, so polished inlet tracts before the injectors should be advantagious.