Dual Plug Heads, or, What's The Alternative Again?

[nicholastanguma]

Tuners of vintage Porsches, tuners of vintage VWs, tuners of Harley-Davidsons, pretty much tuners of any air cooled big bore engine being it vintage or modern-ish vintage likes to convert to dual plug heads for better flame propagation, especially in hemispherical combustion chambers. The result is not so much a horsepower increase, but a torque and throttle response increase instead, due to better combustion allowing a point higher in compression ratio and cooler running temps.

But I vaguely remember reading something about someone saying all the trouble to tap for that second plug and then figure out the correct retarded timing was unnecessary if etchings called "flame channels" or something similar were shallowly carved into the surface of the combustion chamber. If I remember correctly, these etched lines went from the spark plug opening to the other side of the chamber where a second plug would theoretically be tapped; their purpose was to somehow speed the spark flame along the chamber so that no second plug was needed.

Anybody know what I'm vaguely remembering, or is my subconscious playing tricks on me?

 

[Hillbilly Heaven]

Your very lucky moment. You need to go play the lottery.

I just so happen to know who and what you are talking about.

Just google Singh Grooves or Somender Singh

 

[nicholastanguma]

Your very lucky moment. You need to go play the lottery.

I just so happen to know who and what you are talking about.

Just google Singh Grooves or Somender Singh

Thanks so much, you hillbilly angel! ?

 

[NatersXJ6]

That is really interesting.

His site is funny. I want to believe it, but all of his counter arguments popped up in my head.

I’ve only owned one dual plug engine, a 5.7 Hemi Charger. I can’t say it made a difference, because it was designed that way, but it was a heck of a good car for well over 160k miles before I traded it in.

 

[nicholastanguma]

That is really interesting.

His site is funny. I want to believe it, but all of his counter arguments popped up in my head.

I’ve only owned one dual plug engine, a 5.7 Hemi Charger. I can’t say it made a difference, because it was designed that way, but it was a heck of a good car for well over 160k miles before I traded it in.

After some duckduckgo.com-ing it sure seems as though Singh grooves are snake oil. I didn't read any positive results from folks who had experimented with them.