Hemis now and then

[bordin34]

I thought the new Hemi had a Penthouse combustion chamber so it could fit more valves instead of a hemispherical one.

[Brightyellow69rtse]

i love the hemi in my 2500 its a great engine. it responds well to bolt ons also. if it was up to me id make dodge cram them in every car they could fit it into, its a great motor......Mike

[hemihead]

Actually the 426 is less of a "true" hemi combustion chamber than the first generation ones.  The chambe is slighty flatter and the valves are at an angle which is less ideal than the first ones too.  Also, the pistons in the 1st ones tend to be shaped better to the dome.   The current Hemis are probably a logical evolution and deserving of the name "Hemi".  Aren't the chambers in the modern ones closer to the old Ford Boss 429 or MarkIV Chevy's?  In any case, they found a way to reap some of the hemi chamber advantages as to volumetric efficiency and gas flow while also using some of the quench technology seen in a wedge. 

Somebody gets it . The 50's style Hemi's were really the true Hemi's .

[gtx6970]

The " New Hemi " is not the same animal . It's not even a true Hemi . The only thing they have i common is a name which is used more PR and marketing to suck some more cash out of some clueless people .

correct me if I'm wrong but neither was a 426 if you want to get technical.

By side by side comparisons the NEW hemi is a better design engine in regards to potential performance AND driveability.

Tom Hoover himself once said he would have liked to have had a clean slate to design the 426  on instead of the RB block design. First and formost he would have raised the cam shaft centerline in the block ( AKA NEW Hemi )

[mikesbbody]

and isn't there some 6 cilinders Hemis made n Aussie ?

you mean the 6 pack hemi? nah. not imo it must have 8 cylinders to be a real hemi 

[hemihead]

The " New Hemi " is not the same animal . It's not even a true Hemi . The only thing they have i common is a name which is used more PR and marketing to suck some more cash out of some clueless people .

correct me if I'm wrong but neither was a 426 if you want to get technical.

By side by side comparisons the NEW hemi is a better design engine in regards to potential performance AND driveability.

Tom Hoover himself once said he would have liked to have had a clean slate to design the 426  on instead of the RB block design. First and formost he would have raised the cam shaft centerline in the block ( AKA NEW Hemi )

But I don't think the new Hemi can take a Nitro load without grenading like the 50 and 60's Hemi's .

[Ghoste]

Oh yeah, throw that out there.

[Ghoste]

and isn't there some 6 cilinders Hemis made n Aussie ?

you mean the 6 pack hemi? nah. not imo it must have 8 cylinders to be a real hemi 

The Aussie hemi is less of a hemi head than a marketing effort when you look at it in cross section.  There is a bit of a dome suggestion to the chamber shape and the valves are inclined from vertical but the port flow isn't as direct.

Mike, you must really hate the old 4 cylinder K cars with the Hemi badging huh?  How do you feel about the Toyota Hemi?  It's a V-8.

[mikesbbody]

toyota hemi? no thanks

[Ghoste]

I think it's pretty rare to see one outside of southeast Asia anyway.  (I think they're all aluminum though?)

[69_500]

Yuppers there is a Toyota HEMI and they are plentiful in Thailand. Heck there was even a Nissan engine that had a Hemispherical combustion chamber in Thailand. I believe it was a V6 however. I know I have some photo's of them around here. Dodge wasn't the first ones to use a HEMI design anyways.

[Joshua]

Toyota 2TC and 3TC 4 cylinder engines are also hemi's and were available in US cars....

[hemihead]

Yuppers there is a Toyota HEMI and they are plentiful in Thailand. Heck there was even a Nissan engine that had a Hemispherical combustion chamber in Thailand. I believe it was a V6 however. I know I have some photo's of them around here. Dodge wasn't the first ones to use a HEMI design anyways.

Oh I beg to differ . Chrysler started developement on the Hemi early in WWII . It was supposed to be an engine used for either Aircraft or Armor . Don't even try to tell me the Japs made it first . 

[69_500]

I actually think that the Germans are the one who first used a hemispherical head on an engine, and it was before WWII. I'll do some digging, but I'm almost sure it wasn't chrysler.

[Joshua]

The Hemi head principal has been used since the early 1900's.....and not by Chrysler.....
Chrysler just developed it further and marketed the hell out of it.....

[Troy]

Yuppers there is a Toyota HEMI and they are plentiful in Thailand. Heck there was even a Nissan engine that had a Hemispherical combustion chamber in Thailand. I believe it was a V6 however. I know I have some photo's of them around here. Dodge wasn't the first ones to use a HEMI design anyways.

Oh I beg to differ . Chrysler started developement on the Hemi early in WWII . It was supposed to be an engine used for either Aircraft or Armor . Don't even try to tell me the Japs made it first . 

Dodge manufactured Wright Cyclone engines for B-29s in WWII and it seems they "borrowed" the hemispherical head design from that experience. The Hemi heads were used in cars much earlier though.

Troy

[Ghoste]

How about some of the old bike engines?  Harley V-twins?