[Diy_efi] Link for greenfire spark plugs...

[Jared Ryan]

I agree, but what about on a wet manifold, like a GM TBI?

I am about to convert an '84 Chevy El Camino with a 305 and QuadraJet 
to TBI, and I am considering testing a spacer that is supposed to make 
swirl, to put some objective numbers on it... 1/4-mile ETs, 60-foot 
times, etc.  I'm an amateur but I'm a natural tinkerer, so I'm curious.

I agree that the swirl would have no effect (and I doubt there would be 
any swirl by the time the air reaches the ports) on a multiport engine 
but I wonder if it helps any on a TBI engine.  My guess is that it all 
depends on the exact engine/manifold setup.

I've enjoyed following this discussion, and I agree the "science" 
behind these spark plugs looks very shaky.  My understanding (limited 
though it is) is that once you start the flame, it spreads, period.  
The only engines I know of where there was a big problem lighting off 
the mixture was old gasoline engines with very big bores, like used on 
Seagrave and LaFrance fire trucks before they switched to Diesel.  I 
have heard they had two spark plugs per cylinder simply because the 
bores were so big, to ensure complete ignition.  Unfortunately I have 
not gotten to see such an engine taken apart.

Going back into lurk mode, enjoying the discussions. :-)

  ---> Jared Ryan <---
jryan at caminofx.org | http://www.caminofx.org
Yahoo!: gerhardr2001 | ICQ: 8457412

On Jun 8, 2005, at 3:51 PM, Daniel R. Nicoson wrote:

> I put this device up there with the intake swirl plates (mount right 
> after
> the throttle body) that are supposed to induce a "vortex" to intake 
> air on
> an EFI engine.  "This results in more complete mixture distribution".  
> Those
> damn things ignore the fact that there is NO mixture to be distributed 
> until
> the intake port where the fuel injector is squirting fuel!