is the 1fzfe a hemi?

[concretejungle]

I was chatting with an older friend of mine, this guy knows about everything there is to know about motors, anyways, so as we were talking he asked me to pop the hood on the cruiser. We were talking about motors and my plans of some day adding displacment and hopping up the motor and adding a turbo blah..blah.....and then he says, "hey, this is a hemi designed motor." I was like what? So he kinda started explaining that when the plug is vertically on top of the piston it normally indicates a hemispherical design. So, does the cruiser have a hemi?

 

[KliersLC]

WIth my limited understanding of the design, technically yes. It was a big advancement in engine designed when first produced in the 50s with the 392 hemi, and it kicked a## in the 60s with the 426 hemi, but Patent laws are only 30 years IIRC so if it was still viable, everbody would do it. My 81 toyota had a "HEMI" design, as did my camry, and my 4runner, and my t100, and my 80. My take on the new dodge hemi is a hopped up magnum engine with a power chip and a marketing gimmick.......But........... I could be wrong.
Hope this helps.
Dan

 

[toddslater]

My 02 is no it's not a hemi. Yes the plug goes down in the top/center, but that is due more to being a DOHC head. IIRC hemi heads are called hemi's due to the fact that the combustion chamber is hemispherical in shape.

 

[landtank]

I always thought it was. My limited understanding is that with the 4 valve configuration the head's shape is Hemispherical. Not sure if the piston shape is part of the equation in what Chrysler calls a hemi.

 

[jesterb]

Todd's on it.

 

[KliersLC]

I haven't had the heads off of the rest of them, but the combustion chamber on the 22r looked kinda like a hemisphere........with a squished top........ and little pieces of piston protruding from the aluminum......

 

[Trapper]

This could be completely false, but a mechanic once told me that the cruiser engine was actually developed by John Deere and Toyota bought the rights to it. Does anyone know if there is any truth in that?

 

[Scamper]

When my head was off, I didn't notice it being a hemi, and I think I would have. But AFAIK, with a 24-valve engine, it would be extremely difficult, if not downright impossible, to make a hemi becuase the geometry does not allow it. That's why you don't really see hemi's out there any more--when they went to multi-valve systems, they had to let it go (new Dodge's notwithstanding).

 

[FirstToy]

The new HEMI isn't even a hemi. The chambers are squashed on the sides so it's not a true hemisphere.

But they get around it technically because it is a hemisphere when sliced on a plane perpendicular to crank center line and

the valves are directly opposed, and on the same plane mentioned above.

(so if the 1FZ meets those requirements, it's a HEMI)

It also has 2 spark plugs per cylinder. Pushrod/2 valves per cylinder

354 cu in/ 5654cc
9.6:1
345bhp@5400
375lb-ft@4200

~from some tech literature.

 

[bjowett]

Technically, it is a narrow angle pentroof design... hemisherical combustion chambers would have the shape of half a sphere, which the 1FZ does not have. The two are similar in many other ways and performance advantages.... from what I have read, the pentroof is a better more modern design. Good crossflow between the intake and exhaust valves along with a centrally mounted plug to give a good even burn and/or ????

 

[concretejungle]

I haven't had the heads off of the rest of them, but the combustion chamber on the 22r looked kinda like a hemisphere........with a squished top........ and little pieces of piston protruding from the aluminum......

My friend stated that he knew the 22r was a hemi. But he thought based on looking from the design of the 1fzfe from the outside that it was possibly a hemi also. Just curious. I might have to get me one of them there hemi stickers....

 

[Riley]

It's all a bunch of marketing hype anyway.

I can't stand marketing bull, I hear it all day.

What counts is the specs like HP and Torque and how much fuel you use to get that power.

 

[PHAEDRUS]

as far as the john deere motor idea that is not what I understood.

My understanding was that the roginal F bloc was based on teh chevy 250 ish straight six motor. commonly used in the early 50s and 60s but that is just heresay not really sure on it.
Dave

 

[toddslater]

From the looks of it https://forum.ih8mud.com/showthread.php?t=28870&highlight=head...not a hemi as defined by these folks http://www.thehemi.com/forums/viewtopic.php?t=155
If I had to choose between old school hemi head and and the 1fz...I think I'd definitely opt for the 1fz....even without flow benching them, the shear math of it says mo better flow. Then I started thinking about what hemis I know of...yes the MOPAR hemis, the Ford Boss 429, and the Daimler SP250 had a cute little hemi in it. Is it a coincidence that Chrysler and Daimler are know one ???

 

[informationjunky]

as far as the john deere motor idea that is not what I understood.

My understanding was that the roginal F bloc was based on teh chevy 250 ish straight six motor. commonly used in the early 50s and 60s but that is just heresay not really sure on it.
Dave

That is correct

 

[Gold Finger]

I thought that hemispherical heads were old hat and that the Herron not sure about the spelling flat head but dished piston crown superseded it. This is because is introduced swirl improving scavenging and accommodated steeper valve angles which allowing more efficiency.

 

[aamiggia]

So let me get this straight.

The new "Hemi" is a pushrod engine with only 2 valves per cylinder?!? Is the engine design new, or is it a rebuild of an existing engine? That's a bit low tech. I guess a good formula for them is make the engine massive and reduce the out put so it will last longer.

I'm not that surprised American car companies still design with old skool technology. Most of the car engines are still pushrod. 's