Hemi?

[PT-ERA]

I saw a recent show on cars on the History Channel and I finally understand what the Mopar "Hemi" is all about. Question: is the 2.4L engine in the PT a "Hemi?" (I.E. hemispherical piston head) Inquiring minds want to know.

[8)] Cruise on!

[mvandale]

Yes.

[CREWZIN]

[Espresso]

No it is not. Chrysler has made a hemi engine since the 426. There are some that are similar, but not a hemi. And NO none of that new crap they have out, is an actual hemi. Dont believe the hype. A hemi engine COULD NOT conform to emission standards today.
The PT cruiser has a Pent Roof head.
Pent roof heads are very similar to hemi, but not the same. Not that it matters. Because the 4valve pent roof heads are far superior to the hemi heads anyway( alot more airflow, better quench, ect..).

[CREWZIN]

Darn...looked like a hemi to me. [:I]



http://www.hotrod.com/featuredvehicles/26405/

[Espresso]

quote:Originally posted by CREWZIN

Darn...looked like a hemi to me. [:I]



http://www.hotrod.com/featuredvehicles/26405/

LOL..yeah thats a Hemi alright. But the 2.4L is not

Damn that car looks good. Makes me want to just stop the Criper in its tracks & just drop a hemi in one, atleast a blown 440 or something...whew.

[rszappa1]

A lot of people that did not grow up with the REAL hemi...think that and engine that has sprk plugs going through the valve cover is a Hemi...Not true the 2.4 is not a Hemi...The new Hemi from Chrysler/Dodge actually is not a true Hemi neither. The head is not perfectly round. The old Hemis from the 50 and the 426 Hemi had true Hemi heads on them...The 429 Boss engine from ford was not a true Hemi either...

[Herschel]

If I remember correctly-the Ford 429 was called a semi-hemi.

[mvandale]

I still disagree & think this is open for interpretation.

Many people think that the "domed shape" of the piston makes it a hemi. Having built hundreds of Mopar engines, it is clear that you could put domed pistons (though not as domed as a hemi) on any of the big v-8s, but it still would not be a hemi.

The hemi head claim to fame is the location of the valves--

"The Hemispherical cylinder head allows the valves to be inline rather than side-by-side."

Hence, the location of the valves is the key--and the 2.4 (as do most OHC engines, has hemispherical combustion chambers.

[SteelBlueGT]

It must be open to interpretation cause DC calls there new ones Hemi and advertises it like crazy. I do not consider any 4 valve OHC engine a Hemi. I have mixed feelings about the new Hemi's from DC just not sure that they should have that famous name. Great marketing tool especially now that the have the added advantage of turning off cylinders for better gas mileage.