Sheet Metal Intake Manifold.

[tauruck]

I hate always asking for help.
I also love contributing where I can but assistance is what I need AGAIN!!!.
This time it's spark plugs. I've got some pretty special plugs from one manufacturer
but they're for NA gas application.

The EFI, turbocharged Ethanol (98%) Ford Cleveland set up is new to me.
I have no reference to go by and the new sponsor Bosch needs to know what plugs I want?.

I don't know where to begin. The motor is pretty obsolete by current standards so expert help is required.

Thanks guys.

[Dynoroom]

Sorry Mike, this is going to be tough for you. The iron Cleveland Ford head uses a 18mm taper seat spark plug. You need a fairly cold plug for a turbocharged application. Autolite #124 is the coldest they have. 18mm spark plugs are not used in any production engines anymore so getting a good race plug is kinda hard. You should be able to come up with something that will work, it just not as easy to get.  

Just looked up the Bosch number, try this #7950


Another reason not to run old stuff......  it costs more later.

[kiwi belly tank]

Aussie heads have 14mm plugs.
  Sid.

[4-barrel Mike]

http://eugene.craigslist.org/pts/5121273373.html

http://portland.craigslist.org/clk/pts/5111663704.html  

Mike

[tauruck]

The NGK stock I have is 14mm.
#R5673-7

Probably too hot for my current application
but the only way to resolve this is to call my connection and get his advice on
what he recommends and then try find Bosch plugs with that rating.

Thanks for the input guys.

[Speed Limit 1000]

When we had access to Champion engineering support, they said for long WOT runs use the coldest plug that would light the fire. It has always worked for us. 

[fordboy628]

When we had access to Champion engineering support, they said for long WOT runs use the coldest plug that would light the fire. It has always worked for us. 

x2!!!!

You may have to try to install "inserts" to reduce the spark plug threads from 18mm to 14mm to be able to come up with plugs.    I still change from 14mm to 10mm plugs for certain applications, like Ford based F/Jr and some whippy BMC's.

25 years ago, Bosch had a line of racing 18mm plugs for the 2 liter German Ford with the iron head.   Ask your Bosch guy if they might work for you.  If so start the "snipe hunt" for new old stock.

I'll check through my stores for NOS Bosch 18mm.   If I have any, I'll post the part # for you to forward to your Bosch guy, to check for suitability.   This would be a short term fix though, long term, you need to change over to 14mm.


Fordboy 

[redhotracing]

We run NGK TR7's (BR7EF) we run have been great for us.
Using an adapter, I can see TR55's being good, as well.

[kiwi belly tank]

He doesn't need adaptors, his heads are 14mm. 
  Sid.

[tauruck]

Still no PC and ADSL connection.
Landline still out as well.

Fighting on though and thanks to my mate Ian  I can connect from his place.

Here are the pics of the new plenum project.
The box will be Carbon but I've started fabricating the runners, runner mounts and other bits.

No milling machine but we make a plan.
I found 8mm Ally leftovers and cut them to size. I punched and drilled the 4 mounting holes using
marking blue as a guide.
A cross through the center and I got to work on punching out the opening for the plenum end of the runner.
This is round but needed to be angled. Drill press and hole saw.

[tauruck]

I pre shaped the head side of the runner.
It almost matches the port but later die grinding will clean up the
small stuff.

[tauruck]

Two more shots of the work.

[tauruck]

Now I need a welding jig to hold all the pieces in place when it goes for welding.

I did all the marking, drilling and mounting for the plenum (rhs).

[tauruck]

All the nuts got tacked so that nothing moves.

Then I fabbed a base with ends off the original "too short" plenum from steel plate.

[tauruck]

Pics of the thing coming together.