injector bosses

[James Weiler]

On Thu, 28 Aug 1997, Paul Witek wrote:

> Hey gang-

<snip> 

> Now I just need to figure
> out how to modify the manifold for the injectors....
> 
Hi Paul.  You and I are at the same place.  I'm trying to figure out how 
to mount injector bosses in an aluminum intake as well.  I've thought 
about threading them in but large taps and dies are expensive, but if 
this is the way to go then I'll just bite the bullet.  

Welding (I've been told) will distort the manifold too much.  What 
about bolting it to a pair of heads prior to welding?  Ideas anybody?
I've heard alot of people have epoxied them in place but I worry about 
the durability of the epoxy.  How long will it take for gas to break it 
down is one of my concerns.  I don't know but epoxy just sounds Mickey 
Mouse.  Am I way out of line here?

My bosses have an outside diameter of 0.845 inch and I've drilled a 14mm 
hole through the centre for the O-ringed part of the injector to fit into.
I have access to a lathe so I can mill them down to 0.75 inch diameter.

What kind of angle between the boss and the runner are you going to use?  
The Corkey Bell book claims 20 degrees is maximum.  If you look at what's 
out there (i.e. Accell for example) they mount bosses straight up.  The 
intake runner is at about 45 degrees in that case so the angle is between 
the boss and the runner is also 45 degrees.  So much for the 20 degree rule.

Perhaps I'm sweating something really trivial and I should just get on 
with it.

cheers
jw