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I never measured the bosses - only the injector
holes. ( I have attached a drawing from somebody that provides some
dimensions that may help - they look about right, but I have not checked
them). I do use the deflectors under the injectors - I would hazard
a bet that the primaries (in the block) are probably the area which benefit the
most since they are so close to the intake port. The secondary spray has a
bit more time to spread out and vaporize. But, I do use them both places
since I had them. Also the plastic diffusers provide some heat insulation
between the block and the injectors.
Since just about every installation is different, most of
us either make or have made the fuel rails and injector bosses for our
particular installation. I use the stock primary port injector hardware to
hold the injectors in place and I found AN-6/mm adapters that I could screw in
both ends of the stock (the primary fuel rail made of an aluminum casting from
the older model 13Bs like 86-87 not the newer stainless steel tubes)
primary rail. Here are a couple of photos of my intake installation - you
can see the secondary fuel rail covered in orange fire-sleeve. They may
help.
For my secondary injectors which are installed in the
lower manifold from an N/A engine where the rods for the auxiliary port
cylinders had been. I then cut a stock secondary rail in half (again the
cast aluminum type not the stainless steel tube type of later models) tapped
each cut end and inserted a AN-6 Fitting. I then use aluminum tubing to
extend the distance and to connect each part of the fuel rail.
There are injector bosses for sale but I don't think they
are sized for the Mazda injectors. You can also buy fuel rail stock and
drill your own injector holes in them. Reaming them to their final size as
mentioned in e mails on the topic recently.
Ed
----- Original Message -----
Sent: Monday, October 30, 2006 10:07
AM
Subject: [FlyRotary] Injector
bosses
Nice to see that every one attending the rotary
roundup had a great time.
I have some questions on the fuel
injection. 1. Does anyone have the dimensions for the bosses that
are welded onto the intake manifold for the secondary injectors.
2. Do you use the deflectors under the
injectors.
3. Where is the
best source for obtaining the parts that are used to mount the
injectors. JohnD
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