Maybe this has already made its rounds. But Voila. Glad i didnt spend 500 bucks on it.
http://www.pg-unlimited.com/index.as...ROD&ProdID=122

 

Wow, I can make those for a lot less than $450.

I can make them for FREE.

 

so they want 450$ for 2 ******* bolts?

 

Maybe they are Mazda OEM parts, that would explain the price...

 

bwhaahah...

 

why would one need those?

 

What's so wrong with simply turning off trailing ignition? Why do I need to purchase a couple expensive bolts?

Oh, ok. It's so there won't be a buildup of carbon that could glow hot and break off or mess up my apex seals. Is that really a possiblility in the real world?

 

https://www.rx7club.com/showthread.p...hreadid=313424

 

well you can buy a lot of cold spark plugs for $450....

 

or bolts..

 

If trailing wasnt that needed, why did mazda's race team add a 3 plug up top on 787b? Its that a extra trial plug?

 

I think I'll take my chances. Since I'm NA, the only problem I can think of is a carbon buildup that could break off and go into the header.

 

Lots of people asking my advice on it, but I never knew what they were until now.

Now, I know what the big ***-reaming is for...

Sure, you get incomplete combustion burn due to no trailings, but you also lose power.  The incomplete combustion helps prevent detonation, so they are right - it does work.

Okay, so you get less detonation but also lose power at the same time.

I call this band-aid tuning...

I know of one very well-know shop on the east coast who was offering these things and having their customer signing NDW's - now I know why they didn't want anyone knowing what they were.


-Ted

 

Maybe I'll hook up trailing sooner than I thought I would.

 

The 3rd "far trailing" was used for a little better power and fuel economy.
I think the SAE paper states that normal trailing spark plugs add around 10% of the power output.
Remember, the 787B car was an endurance racer, so fuel economy is a concern.
There's a write-up on all of that, but I remember something like 6% better fuel economy.  On a 24 hour endurance race, the car goes though hundreds if not thousands of gallons of gas.  Fuel stops mean less time on the track.  At this level of racing, even a couple percentage points of fuel economy can mean the difference in a couple places in the end.


-Ted

 

Not just that, but the 24 Hours of LeMans (as well as other races) has a limit as to how much fuel you can use. Running out of your fuel allotment before the 24 hours are up would be a bad thing, unless you were *reeeeeaaaaallllyy* far ahead (doubtful).

That's where the accomplishment was - winning requires not only being reliable, but having excellent fuel economy as well. (Which is why they were running the thing well lean of best power, something you can do with an N/A rotary)

 

You've GOT to be kidding me! Talk about a replacement for bad tuning skills.

 

Yeah, kind of... well, I don't think I'm going to comment on the things actually.

I think I may go try to make a 3-plug housing though... depends if I get bored of wiring up the car.

 

The R26B rotors were specially designed to work with the 3-plug system. Have fun making new rotors.

 

Hey, I wouldn't do this stuff if it weren't fun.

At this point, I'm just messing around with the milling machine and dead rotor housings because I can, not because I intend to build it into a working engine. Hell, I should take pictures of the godawful way-too-huge peripheral port I cut for ***** and giggles.

... darn forum. Not showing up that I posted...

 

Shouldn't be that much of a problem...
Just drill a hole and blockweld the coolant passages.
I guess there might be some worry about getting more than one rotor housing to be identical in far-trailing spark plugs position.

Mazda fired the normal trailing and the far-trailing both at the same time, I believe.


-Ted

 

Essentially what I had in mind, though IIRC from looking at an R26B, there needs to be some other little modifications so that the plug doesn't interfere with the part of the housing by the oil passage.

Identical positioning... well... milling machine! Why yes, I do tend to look at that as a solution to most of my problems.... what a great toy.

 

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oooorrrr you could pull your trailing spark plug wires...

$150... or free... hmmm...

 

That's quite a drop in price. I still think it needs to be reduced further to keep it competative with simply pulling your trailing plug wires.

Considering machining costs (nill once it's set up) and material cost (stock is what per foot?), they could do better and still turn a profit.

I am considering buying these so I don't have to hook up trailing. I'll weigh it with the cost of three ignitors and three coils on my NA 20B. Of course that's $150 for two, so I'm going to have to break the bank if I want three. Real tough decision...