Challenger #2 up for bid on ebay

[twistedwedge]

Let me rephrase that, since I purchase quite a few things there as well. Not all ebayers are morons-just the ones that pay 8500 for a ps3, etc etc.

The hemispherical combustion chamber design is used by plenty of manufacturers. My last Honduh accord had a hemi head..lol. Dodge just tries to put a spin on it claiming its so badass since it has a "hemi" in it. I have to hand it to them though, its a successful marketing gimmick.

[Mr. Wyndham]

oh, see? learn something new everyday!

But I always thought that Hemis were a more pronounced Hemispherical shape compared to other vehciles. <== that's what I used to account their terrible mileage to.

[twistedwedge]

To properly identify a combustion chamber, all its aspects including shape need to be considered. Hemispherical or Pentroof - The "Hemi"

A chamber of this design is considered to offer the least amount of compromise for the efficiency gained. Effectively, a hemispherical combustion chamber is one half of a sphere cast into the bottom of the cylinder head. The valves are placed at the outside of the bore area and at a specific angle from the crankshaft centerline. Optimizing this position allows for huge airflow gains, since it moves the valve away from the wall to keep it from creating turbulence. This creates a more efficient cross-flow movement of the charge during valve overlap and limits thermal transfer from the exhaust valve to the fresh charge. As mentioned previously, this design offers the best surface-to-volume ratio and also creates a very short direct exhaust port, essential in limiting heat rejection into the coolant. Hemispherical chambers generally have a central spark plug, which offers excellent octane tolerance. An additional benefit is the distance between the intake and exhaust valves, which further limits heat transfer.

http://www.secondchancegarage.com/public/585.cfm

[Mr. Wyndham]

cool, thanks for that.