[misterp266]

Originally Posted by GTOGEORGE

That’s funny! LOL!


GTO George

? ? ? ?

[GTOGEORGE]

Originally Posted by firechicken

There was a couple posts deleted including mine...weird

It’s B_llsh_t!


GRO George

[GTOGEORGE]

Originally Posted by misterp266

? ? ? ?

It’s your “real Pontiac Hemi head engine” comment! LOL!



GTO George

[shermanator2]

Sorry to be late to the party, but are you guys arguing over what is a hemisphere, or what is a hemispherical combustion chamber, or what is a HEMI?

Chrysler automotive engines never had a true hemispherical chamber. They were spherical domes, but not full hemispheres. The problem with a true hemispherical chamber is that is is very large and dependent only on the bore. To get any reasonable compression, you need either very tall piston domes, defeating much of the purpose of the hemisphere, or a very long stroke.

For example, to get a 10:1 compression with flat top pistons, my back of the envelope calculations say that you need a stroke that is 3 times the bore. We know we can never get that to breath or stay together.

So HEMI is just a catchy name and currently a trademark of FCA.

[Scott Roberts]

Originally Posted by shermanator2

Sorry to be late to the party, but are you guys arguing over what is a hemisphere, or what is a hemispherical combustion chamber, or what is a HEMI?

Chrysler automotive engines never had a true hemispherical chamber. They were spherical domes, but not full hemispheres. The problem with a true hemispherical chamber is that is is very large and dependent only on the bore. To get any reasonable compression, you need either very tall piston domes, defeating much of the purpose of the hemisphere, or a very long stroke.

For example, to get a 10:1 compression with flat top pistons, my back of the envelope calculations say that you need a stroke that is 3 times the bore. We know we can never get that to breath or stay together.

So HEMI is just a catchy name and currently a trademark of FCA.

I will add, it has a flat with a round shape... current "hemis" and that thing kre copied ( my opinion) doesn't remotely resemble a "hemi" .
You are correct in the fact it's not " deep" enough so to speak to be a true Hemispherical shape..
I hope it works out for Dill... it will have a coolness factor for sure but the warp head will make more....and reliable power in my opinion..
Have those heads been on a spintron?

[GTOGEORGE]

It’s not a copy. Realistically almost every head out there is a copy of something.



GTO George

[mgarblik]

I hope we can mostly agree this new head is "HEMI inspired", or " hemi...ish". If your designing a billet head, you want to incorporate latest technology or what you believe will work best for your type of racing. Our "Ram Air V" billet head had more of a hemispherical chamber shape than this KRE version of the "HEMI" head because we wanted to remove the squish and Quench pads to work better with nitro fuel. But we wanted to retain the Ram Air V port configuration, pushrod tubes and all. Chrysler Corporation was smart enough to understand the history and legacy of the old HEMI head design and realized that i could equal huge sales. So they added squish and quench to create a little mixture motion to pass emissions and the rest is history. In the end, it's all just a bunch of words. I don't know what the end use is for this KRE billet head, but I hope it works out well for the user. It's a big expense to design and make a pair of billet heads. Ours took about 8 years to develop and $$$$ to produce.

[Dragncar]

My pickup. Might not be a true Hemi, but I bet you could make some power with it if the parts were even available.

[Scott Roberts]

Originally Posted by Dragncar

My pickup. Might not be a true Hemi, but I bet you could make some power with it if the parts were even available.

Cool story bro...

[Dragncar]

Originally Posted by Scott Roberts

Cool story bro...

Glad you liked it bro.

Tundras have fantastic engines. Toyota took a regular I Force engine and put their 10psi factory roots blower on it, made 504 HP. Then hit it with 200 shot of spray on top of that. Engine took it, car ran 8s.

[GTOGEORGE]

Pontiac Hemi intake port..........BIG!


GTO George

[PontiacJim1959]

Originally Posted by shermanator2

Sorry to be late to the party, but are you guys arguing over what is a hemisphere, or what is a hemispherical combustion chamber, or what is a HEMI?

Chrysler automotive engines never had a true hemispherical chamber. They were spherical domes, but not full hemispheres. The problem with a true hemispherical chamber is that is is very large and dependent only on the bore. To get any reasonable compression, you need either very tall piston domes, defeating much of the purpose of the hemisphere, or a very long stroke.

For example, to get a 10:1 compression with flat top pistons, my back of the envelope calculations say that you need a stroke that is 3 times the bore. We know we can never get that to breath or stay together.

So HEMI is just a catchy name and currently a trademark of FCA.

"Zora Arkus-Duntov, who designed a HEMI head conversion for the Ford flathead V-8, is often credited for inventing the HEMI, but the Welch brothers pioneered the engine at least 30 years before his involvement, which began with the Welch Motor Car Company in 1904. Peugeot developed its own hemispherical engine. BMW mass-produced a HEMI version before Chrysler engineered it for modern use. Pratt and Whitney used HEMI heads on its radial aircraft engines during World War II, while Chrysler used HEMIs in 1939 for its V-16 engines for military aircraft."

Top 5 Hemis NOT built by Chrysler - Daimler V-8, Porsche Flat-6, Aston Martin V8, Jaguar XK Inline-6, Alfa Romeo Busso V-6.

The "hemi head" is not a true hemispherical shape, but is instead a "pentroof" design. See photo.

[GTOGEORGE]

Ladies and Gentlemen Dils Hemi headed engine is on the Dyno.... I’ll download video later today!!
History in the making!!



GTO George

[Stan Weiss]

Originally Posted by GTOGEORGE

Ladies and Gentlemen Dils Hemi headed engine is on the Dyno.... I’ll download video later today!!
History in the making!!


GTO George

So George. Exactly what history is being made?

Stan

[GTOGEORGE]

When was the last time a hemi headed Pontiac engine was on the dyno and also racing on the drag strip?


GTO George

[tom s]

Norwalk a couple years ago.Tom

[Stan Weiss]

While not on a drag strip. For how many years did Jack run his Pontiac Hemi?

Stan

[GTOGEORGE]

Apples and oranges.........this is a 500 + cubed hemi heard v8 race engine. 1,000-2,000 hp race engine.


GTO George

[GTOGEORGE]

I don’t remember jacks v8 engine go down the track?



GTI George

[tom s]

you said Hemi not V8 hemi.Tom