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Old 07-24-2008, 12:57 PM   #1
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Yeah... it's gotta Hemi.

Found something interesting from this site when I was reading up a little on detonation and octane ratings. This guy designed the Northstar engine.

"Hemi racing engines would typically knock the ring land off, get blow by, torch the piston and fall apart. No one then understood why. We now know that the Hemi design is at the worst end of the spectrum for a combustion chamber. A nice compact chamber is best; that's why the four valve pent roof style chambers are so popular. The flatter the chamber, the smaller the closed volume of the chamber, the less dome you need in the piston. We can get inherently high compression ratios with a flat top piston with a very nice bum pattern right in the combustion chamber, with very short distances, with very good mixture motion - a very efficient chamber."

Aaaannndd... overhyped marketing FTW!!!!


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Old 07-24-2008, 01:55 PM   #2
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thats rather interesting...

doesnt Hemi refer to the Hemispherical combustion chamber design of the early Hemi motors...i thought that design wasnt shared with the new motors?
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Old 07-24-2008, 02:05 PM   #3
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thats rather interesting...

doesnt Hemi refer to the Hemispherical combustion chamber design of the early Hemi motors...i thought that design wasnt shared with the new motors?
I believe you are correct the new "hemi" is nothing more than a marketing gimmick.
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Old 07-24-2008, 04:32 PM   #4
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Most other people would think that hemi's only come from dodge, when the same technology for the hemi's are used in modern day cars and not just Mopar.

Found that out through some old folks and wikipedia.
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Old 07-24-2008, 04:50 PM   #5
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If I remember right... didn't oldsmobile use the Hemi in some of there cars?
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Old 07-24-2008, 06:42 PM   #6
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^^ No. Chevrolet designed a hemi engine though. That was the big rage back in the late 50's after Chrysler introduced the first Hemis in 55 if memory serves correctly. Ford didn't up the ante until the 427 SOHC came out. It dogged the Hemis, but was unreliable.

Northstars are utter crudmuffins. My mother had one as a company lease vehicle. She had the option to buy, but she thought it was best to ask the mechanic at the dealership. He told her that it was not a good idea to purchase that car. Before it had 10k on it, I heard some kind of valvetrain noise which sounded like a loose rocker- although I don't know if those engines even have cam followers.

I don't take this without much salt. I know people who raced Hemis in the late 60's and early 70's. He switched from the Ford 427 OHV because they just couldn't keep up with the Hemis any more. The SOHC would stomp the Hemis, but you needed to be a dealer to keep one working. Even the old Hemis didn't have a perfectly rounded combustion chamber, and the pistons were absolutely not flat- especially higher compression pistons. Probably the most important thing about the Hemi was not the combustion chamber, it was the dual rocker arm shafts. If the Hemi was such a crapola engine, then how did Donovan build one to put out 2000 hp? Where's the Northstar that puts out half that?
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Old 07-24-2008, 06:48 PM   #7
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I couldn't find any articles on that engine, but here's a 1540 hp engine for sale for a mere $56k

http://www.steveschmidtracing.com/en...commander.html
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Old 07-24-2008, 08:09 PM   #8
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I know the 1969 and 1970 Ford Mustang Boss 429 was a Hemi. But thats kinda weird that the new Hemi™ isn't an actually hemi

Read Here:http://en.wikipedia.org/wiki/Chrysler_Hemi_engine

Go to where it says Modern Hemi™
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Old 07-24-2008, 09:36 PM   #9
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it has been proved time and time again that a hemi-spherical combustion chamber is the BEST kind. the new hemi's do in fact have that design, it just isnt too uncommon these days, however it is very rare for a cam in block engine. most sohc or dohc engines are hemi's, but they cant be called that as chrysler has the copyright.
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Old 07-25-2008, 06:18 AM   #10
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If my memory serves me correct, most head designs that were specifically designed for racing in the 1960s and early 1970s were hemispherical combustion chamber designs - at least the ones that were bought directly from the factory for the purpose of racing (my experience is with Fords, I am not sure about GMs) My dad bought a set of heads (from Ford) that were hemi heads for the 427 wedge motor that was in the Thunderbolt he used to race. I don't recall the performance gains, but I do remember him saying they provided a better air/fuel burn than the stock heads.
When I finally got into building motors at the ripe old age of 15, I asked my dad about a set of hemi heads he had in his service station and he explained what they were from (this is several years after he stopped racing). I would use them to work out with when working in the evenings at his service station.
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