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Re: Air injectors and performance (WAS: MGB '69 better than '67?)

To: mgs@autox.team.net
Subject: Re: Air injectors and performance (WAS: MGB '69 better than '67?)
From: "A. B. Bonds" <ab@vuse.vanderbilt.edu>
Date: 16 Nov 1995 09:40:55 -0600
In <199511141513.PAA03132@sauron.thlogic.com>, Jeremy DuBois wrote:

>  Yes, I agree.  The question becomes: how much power does it take to drive
>the pump, and is it a noticable amount?  If you gain 1/8 a horsepower, it
>hardly seems worth it for the added emmisions (for street uses, obviously,
>racing is different).
>  I took the pump off my Spitfire and didn't notice any difference, but I've
>had people argue that they did it on their cars and it made a lot of
>difference.  Again, I think scientific evidence is needed.
>
A bit off the subject, but still the same thread....  Someone recently
commented that the air-injected heads were _stronger_ because of the
cast-in bosses.  Sorry, not my experience, nor that of many others.
The cast-in bosses are drilled, which sets up stress points that make
the heads extremely prone to cracking.  In my own experience I have
handled three air-injected heads and all three were cracked, usually
around the #2 cylinder spark plug hole.  At least with my '73, doing
away with the air injection had more to do with getting a solid head
than with removing the power loss due to the pump.  I have heard
similar stories from several parts dealers as well.
        A. B. Bonds, whose head is not cracked


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