fastbird232 Posted March 23, 2005 Report Share Posted March 23, 2005 Quick question, I read somewhere that the 3.4 has hemispherical combustion chambers. Is that bullshit? Quote Link to comment Share on other sites More sharing options...
digitaloutsider Posted March 23, 2005 Report Share Posted March 23, 2005 For the most part, and from what I gather, yes.. it's true. Quote Link to comment Share on other sites More sharing options...
fastbird232 Posted March 23, 2005 Author Report Share Posted March 23, 2005 A 3.4L Hemi-powered Pontiac. Yeehaw. Quote Link to comment Share on other sites More sharing options...
White93z34 Posted March 23, 2005 Report Share Posted March 23, 2005 yep its true. the 3.4 is a hemi design. Quote Link to comment Share on other sites More sharing options...
WhiteOut Posted March 23, 2005 Report Share Posted March 23, 2005 Yes its true. All, or nearly all OHC engines are Hemi's. Basically all the hemi desing means (from what I understand) is that the head has a spherical or pent roof design with the spark plug located at the top of the combustion chamber. Quote Link to comment Share on other sites More sharing options...
GnatGoSplat Posted March 23, 2005 Report Share Posted March 23, 2005 4-valve per cylinder engines almost always have hemispherical combustion chambers. The Chrysler Hemi's are special because they have a hemispherical combustion chambers using a pushrod design and the conventional 2-valves per cylinder. Quote Link to comment Share on other sites More sharing options...
timg Posted March 23, 2005 Report Share Posted March 23, 2005 No. They're not a true hemispherical design- neither is the new "Hemi". There hasn't been a true hemispherical design since the original Hemi. Tim Quote Link to comment Share on other sites More sharing options...
92chevyeuro Posted March 23, 2005 Report Share Posted March 23, 2005 Dodges "Hemi" does not have anymore power than GM's LS1 or LS2. They just slapped the word "Hemi" on it and everyone thought it was something special. Quote Link to comment Share on other sites More sharing options...
bartonmd Posted March 23, 2005 Report Share Posted March 23, 2005 Admittadly, old chryslers aren't my thing, but I was under the understanding that the new Hemi just kindof... fixed the horrible design issues of the first hemi (and is of course smaller)... The original "hemi" had some odd angles on the pushrod to rocker arm and pushrod to lifter contact points that weren't optimal (and didn't last TONS of miles, but that didn't really matter because of the power gains they got from it)... The new hemi isn't really a "hemi" not because it doesn't have a hemispherical combustion chamber, but because the valvetrain isn't the same as the original one... And from what I get... All a hemispherical combustion chamber needs is the plug to be on the centerline of the bore... nothing else... The "original hemi" was just the first one (not really, but the first really fast one) to be big and known as "THE Hemi" so people compare anything pushrod with a hemispherical head with it... As stated, Chryslers aren't my thing... most of this info is from my friend's dad who used to race them in the late 60's and 70's... Mike Quote Link to comment Share on other sites More sharing options...
JoroCorona Posted March 23, 2005 Report Share Posted March 23, 2005 The new Hemi IS a true hemi by design. Dome top piston and hemispherical combustion chamber. A real Hemi. Most 3+ valve per cylinder heads are whats called a "Semi-Hemi". Its got the hemispherical design, but the piston is either flat top or dished. Quote Link to comment Share on other sites More sharing options...
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