Twin plug Heads

[gavin m]

There is. Pete took a couple of stock front covers, cut them about, then welded them up to make the twin dizzy's work.
Once the HAMB is back up and running I will post a link to the tech feature he posted.

[CrazyBackyardBuilder]

I have this photo of a custom Twin plug setup,

[Scott G]

Any other options available currently? I have seen Elco and Hogans.

[27lizzie]

006 (4).jpg

004 (4).jpg

013 (3).jpgThis is my neighbors twin plug heads of his own design and his own twin dist. set up that he milled out of a block pf stainless

[47Merc]

Interesting that Flat Attack Racing are using single plug heads in their current twin engine streamliner where as they used to use twin plug heads in the earlier cars.

Their new SOHC heads should be interesting to see.

http://www.flatattackracing.com/

[Ol' Ron]

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I think combustion theory is a very complicated subject. In aircraft engines the twin plugs are a safety fetcher, however, the added plug does add power. You can see that during runup. One component of the combustion cycle is called the flame front and begins the moment the plug fires. It runs across the combustion chamber at a rapid pace causing a spike in cylinder pressure as it travels. In some cases the pressure build up is so hi that some unburnt AF mixture detonated. What we call spark knock. The use of twing plugs can eliminate this with well placed plugs by shortening the flame front distance. Thus the logical place to put it is at the top and center of the chamber or over the piston and transfer area.
Automotive engineere have been moving the plug around for years and still arn't quite sure where to put it. The advent of the power tip plug is another improvement in the combustion process. by it's very nature it's pretty self cleaning. Unfortunately they can't be used in stock heads. I'm making a fixture to angle then away from the exhaust valve. Thes can improve the economy of your engine by burning a leaner mixture. I'm sure this subject will be tossed around abit, which is good for the advancement of a better runnng flathead.

[Scott G]

What modifications are needed to run early style heads on later blocks?

[JSeery]

Some water passage/hole issues. There have been several threads on the modifications required, fairly minor.

[bluardun]

Another two cents: I agree with Ronnieroadster. Your effort for HP will be better spent on multiple fire ignition and quality ignition components. The travel from the spark plug into the cylinder can be improved by grinding a small cannel from the spark plug into the cylinder.
If you do run duel spark plugs, are they going to fire at the same time?

[Bassman/NZ]

Originally Posted by 47Merc

Interesting that Flat Attack Racing are using single plug heads in their current twin engine streamliner where as they used to use twin plug heads in the earlier cars.

Their new SOHC heads should be interesting to see.

http://www.flatattackracing.com/

I know where both sets of Flat Attack twin plug heads are. The owner will not part with them, and they are destined for a blown and injected street roadster.

[Ol' Ron]

Flatattack heads are one of the best designs ever made, work very well with a blower. unfortunately have a large combustion chamber for a normaly aspirated engine. I would mill them to reduce the chamber size for a street engine.

[1934calkid]

Have two sets of these laying around, if you notice they are extremely thick.....LOL...........

[Scott G]

My distributor will clear a pair of heads that are 2 3/4" thick. I have a couple pairs located that should fit the bill. Motor will end up a 3.313 bore 4" stroke. I like the looks of a traditional head compared to the Kongs.

[Bassman/NZ]

Originally Posted by Ol' Ron

Flatattack heads are one of the best designs ever made, work very well with a blower. unfortunately have a large combustion chamber for a normaly aspirated engine. I would mill them to reduce the chamber size for a street engine.

Ol Ron, there is a 4-71 blower and Hilborn injection going on this engine.

[1934calkid]

I have a set of these on my garage shelf LOL........

[Scott G]

Nice collection. 21 stud heads won't work on my 24. Hope the kids don't steal them before you do anything with them! LOL.........