Hybrid Cars

A Hybrid in Your Future?

HEMI Engines Explained



You may be surprised to learn that HEMIs were first designed in 1951. It's only within the past decade that they've enjoyed a new surge of popularity (drivers today associate them with raw power). The name was derived by the shape of the cylinder heads, which are hemispherical (a departure from the flat-shaped heads commonly used at the time). In this article, I'll describe the basics behind their design as well as their advantages and potential drawbacks.



Combustion Chamber Efficiency



First, I'll explain the difference between heads that are hemispherical and those that are flat. In a flathead engine, a hole is drilled into the combustion chamber to allow the insertion of a spark plug. The valve and spring are typically positioned at the side of the chamber. It's simplistic in design and comparatively less-expensive to make.



On the other hand, HEMIs use a round head for the combustion chamber with the spark plug inserted at the top. Twin valves and springs are also positioned on the top toward both sides (imagine a few inches above each ear on a person's head). This design allowed for greater efficiency within the chamber.



Advantages



In any car engine, the main concerns involve maximizing thermal, energy, and fuel efficiency. You want your engine to burn as much gas as possible without wasting it. You also want to build as much pressure as possible within the combustion chamber to take advantage of the resulting energy. Finally, you want to minimize the loss of heat within the chamber.



HEMIs are designed with less surface area than flathead engines. Remember that greater surface area leads to greater loss of heat. As gas within the combustion chamber cools, it doesn't burn efficiently. With a HEMI, surface area is limited, so heat is retained and pressure is maximized.



Potential Drawbacks



One of the disadvantages to this type of engine is an inherent limitation in their structural design. While they effectively limit surface area, it also makes it nearly impossible to have 4 valves on 1 cylinder. The reason this is a drawback is because cars that are designed with 4 small valves tend to allow the engine to breathe more easily. A second disadvantage is that HEMIs use large combustion chambers. That makes them susceptible to increased heat loss when compared to smaller chambers.



In the end, it's a trade-off. HEMIs do provide more power to the driver and they're priced accordingly. That said, many drivers will appreciate the efficiency of 4-valve cylinders. As technology continues to improve heat, pressure, and fuel efficiency in car engines, better options are likely to emerge in the near future.



When looking for Everdrive used auto parts and Guaranteed used car engines consider parts from http://www.everdrive.com


2000 DODGE CARAVAN OWNER'S MANUAL

US $0.99 (0 Bid)
End Date: Friday Sep-03-2010 20:33:54 PDT
Bid now | Add to watch list


The Creative Curriculum for Early Childhood by Dodge

US $19.95
End Date: Friday Sep-03-2010 20:34:06 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


Eibach 95-99 DODGE Neon SportLine Lowering Springs

US $199.38
End Date: Friday Sep-03-2010 20:34:08 PDT
Buy It Now for only: US $199.38
Buy it now | Add to watch list


1941 1942 1946 1947 1948 Dodge NOS MoPar RADIATOR ASSY

US $895.00
End Date: Friday Sep-03-2010 20:34:09 PDT
Buy It Now for only: US $895.00
Buy it now | Add to watch list


02 03 04 05 06 DODGE RAM LED TAIL LIGHTS+LED 3RD BRAKE

US $106.99 (0 Bid)
End Date: Friday Sep-03-2010 20:34:09 PDT
Buy It Now for only: US $117.99
Bid now | Buy it now | Add to watch list


SMOKE HALO PROJ FOG LIGHTS 01-04 DODGE DAKOTA 02 03

US $50.49
End Date: Friday Sep-03-2010 20:34:11 PDT
Buy It Now for only: US $50.49
Buy it now | Add to watch list


1998 1999 Dodge Neon SOHC 2.0L Cold Air Intake + Filter

US $16.90
End Date: Friday Sep-03-2010 20:34:11 PDT
Buy It Now for only: US $16.90
Buy it now | Add to watch list


MIRROR dodge B150 94 part auto NEW

US $39.95
End Date: Friday Sep-03-2010 20:34:12 PDT
Buy It Now for only: US $39.95
Buy it now | Add to watch list


2002-2005 DODGE RAM HALO PROJECTOR FOG LIGHTS YELLOW

US $59.99
End Date: Friday Sep-03-2010 20:34:15 PDT
Buy It Now for only: US $59.99
Buy it now | Add to watch list


DODGE CHARGER MESH GRILLE GRILL 2006 2007 2008 2010

US $201.00
End Date: Friday Sep-03-2010 20:34:17 PDT
Buy It Now for only: US $201.00
Buy it now | Add to watch list


18 x7.5" Silver machined Charger Style Rims fit Dodge

US $529.50
End Date: Friday Sep-03-2010 20:34:23 PDT
Buy It Now for only: US $529.50
Buy it now | Add to watch list


87-90 88 89 DODGE DAKOTA 4X6 PROJECTOR BLK HEADLIGHTS

US $14.89
End Date: Friday Sep-03-2010 20:34:26 PDT
Buy It Now for only: US $14.89
Buy it now | Add to watch list


83 84 85 86 87 88 Dodge Truck door handles NEW

US $75.00
End Date: Friday Sep-03-2010 20:34:31 PDT
Buy It Now for only: US $75.00
Buy it now | Add to watch list


89 90 91 92 93 Dodge Truck door handles NEW

US $75.00
End Date: Friday Sep-03-2010 20:34:34 PDT
Buy It Now for only: US $75.00
Buy it now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 & 2500 2003 03 5.7

US $19.95
End Date: Friday Sep-03-2010 20:34:36 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


89 90 91 92 Dodge Ramcharger door handles NEW

US $75.00
End Date: Friday Sep-03-2010 20:34:37 PDT
Buy It Now for only: US $75.00
Buy it now | Add to watch list


1966 Dodge Hemi Charger - Original Vintage AD

US $7.99
End Date: Friday Sep-03-2010 20:34:39 PDT
Buy It Now for only: US $7.99
Buy it now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 2WD 1996 1997 1998

US $19.95
End Date: Friday Sep-03-2010 20:34:40 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


2001-07 Dodge Caravan Rear Bumper Painted

US $341.00
End Date: Friday Sep-03-2010 20:34:40 PDT
Buy It Now for only: US $341.00
Buy it now | Add to watch list


Dodge Dakota, Durango 00-03 UPPER Ball Joint, OEM Mopar

US $56.99
End Date: Friday Sep-03-2010 20:34:43 PDT
Buy It Now for only: US $56.99
Buy it now | Add to watch list


1979 DODGE MITSUBISHI LINE UP ORIGINAL AD COLT D-50

US $5.99
End Date: Friday Sep-03-2010 20:34:46 PDT
Buy It Now for only: US $5.99
Buy it now | Add to watch list


2006 Dodge Challenger HEMI 1/64 Scale LIMITED EDITION

US $13.99
End Date: Friday Sep-03-2010 20:34:50 PDT
Buy It Now for only: US $13.99
Buy it now | Add to watch list


1966 Dodge Charger 426 Hemi - Original Vintage AD

US $7.99
End Date: Friday Sep-03-2010 20:34:51 PDT
Buy It Now for only: US $7.99
Buy it now | Add to watch list


Putco HEADLIGHT TRIM dodge RAM 2500 02-05 04 03 2004

US $54.80
End Date: Friday Sep-03-2010 20:35:02 PDT
Buy It Now for only: US $54.80
Buy it now | Add to watch list


HOOD SCOOP AIR FLOW TURBO BLK DODGE CHARGER MAGUM NITRO

US $8.83 (0 Bid)
End Date: Friday Sep-03-2010 20:35:07 PDT
Buy It Now for only: US $9.77
Bid now | Buy it now | Add to watch list


9006 HID XENON Headlight Kit 2008 2009 DODGE AVENGER

US $39.99
End Date: Friday Sep-03-2010 20:35:16 PDT
Buy It Now for only: US $39.99
Buy it now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 & 2500 2003 03 5.9

US $19.95
End Date: Friday Sep-03-2010 20:35:24 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


41-58 DODGE WINDOW REGULATOR ARM STUD CLIPS

US $4.00
End Date: Friday Sep-03-2010 20:35:25 PDT
Buy It Now for only: US $4.00
Buy it now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 2WD 1996 1997 1998

US $19.95
End Date: Friday Sep-03-2010 20:35:27 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


1980 Dodge Ram D-50 Pickup Truck New Dash Pad Cap

US $67.99
End Date: Friday Sep-03-2010 20:35:29 PDT
Buy It Now for only: US $67.99
Buy it now | Add to watch list


1981 Dodge Ram D-50 Pickup Truck New Dash Pad Cap

US $67.99
End Date: Friday Sep-03-2010 20:35:32 PDT
Buy It Now for only: US $67.99
Buy it now | Add to watch list


AMBER Led Signals DODGE CHARGER DAKOTA DURANGO NEON

US $9.95 (0 Bid)
End Date: Friday Sep-03-2010 20:35:33 PDT
Buy It Now for only: US $12.95
Bid now | Buy it now | Add to watch list


1984 Dodge Ram Van Wagon 150 -350 Dealer Service Manual

US $19.99
End Date: Friday Sep-03-2010 20:35:34 PDT
Buy It Now for only: US $19.99
Buy it now | Add to watch list


1982 Dodge Ram D-50 Pickup Truck New Dash Pad Cap

US $67.99
End Date: Friday Sep-03-2010 20:35:35 PDT
Buy It Now for only: US $67.99
Buy it now | Add to watch list


1970 DODGE MOPAR Cornet Super Bee 3-D Front Wall Shelf

US $69.99 (0 Bid)
End Date: Friday Sep-03-2010 20:35:36 PDT
Buy It Now for only: US $77.99
Bid now | Buy it now | Add to watch list


1983 Dodge Ram D-50 Pickup Truck New Dash Pad Cap

US $67.99
End Date: Friday Sep-03-2010 20:35:39 PDT
Buy It Now for only: US $67.99
Buy it now | Add to watch list


1985 Dodge Ram D-50 Pickup Truck New Dash Pad Cap

US $67.99
End Date: Friday Sep-03-2010 20:35:42 PDT
Buy It Now for only: US $67.99
Buy it now | Add to watch list


Dodge : Challenger bronze color

US $1,815.00 (15 Bids)
End Date: Friday Sep-03-2010 20:35:50 PDT
Bid now | Add to watch list


1986 Dodge Ram D-50 Pickup Truck New Dash Pad Cap

US $67.99
End Date: Friday Sep-03-2010 20:35:52 PDT
Buy It Now for only: US $67.99
Buy it now | Add to watch list


1996 Dodge Stratus TCM (Transmission Control Unit)

US $89.00
End Date: Friday Sep-03-2010 20:36:05 PDT
Buy It Now for only: US $89.00
Buy it now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 & 2500 2003 03 5.9

US $19.95
End Date: Friday Sep-03-2010 20:36:11 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


1994-2001 DODGE RAM TAIL LIGHTS + LED 3RD BRAKE LIGHT

US $43.99 (0 Bid)
End Date: Friday Sep-03-2010 20:36:15 PDT
Buy It Now for only: US $48.99
Bid now | Buy it now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 2WD 1996 1997 1998

US $19.95
End Date: Friday Sep-03-2010 20:36:15 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


1984 Dodge Ram Van Wagon 150 -350 Dealer Service Manual

US $19.99
End Date: Friday Sep-03-2010 20:36:15 PDT
Buy It Now for only: US $19.99
Buy it now | Add to watch list


1998-2007 Dodge Caravan Ignition Cylinder Lock

US $39.95
End Date: Friday Sep-03-2010 20:36:16 PDT
Buy It Now for only: US $39.95
Buy it now | Add to watch list


THE VOYAGE OF AMERICAN PROMISE Dodge Morgan 1989 HC/DJ

US $20.00
End Date: Friday Sep-03-2010 20:36:17 PDT
Buy It Now for only: US $20.00
Buy it now | Add to watch list


BRAKE PADS 1980 DODGE B200 FRONT NEW

US $53.49
End Date: Friday Sep-03-2010 20:36:23 PDT
Buy It Now for only: US $53.49
Buy it now | Add to watch list


HOT WHEELS 2008-135 MUSCLE MANIA 69 DODGE CHARGER

US $0.99 (0 Bid)
End Date: Friday Sep-03-2010 20:36:26 PDT
Bid now | Add to watch list


Automotive Chrysler Dodge Mopar Tin Sign Logo 37-47

US $15.59
End Date: Friday Sep-03-2010 20:36:49 PDT
Buy It Now for only: US $15.59
Buy it now | Add to watch list


AMBER Led Turn Signals DODGE MAGNUM RAM 1500 INTREPID

US $9.95 (0 Bid)
End Date: Friday Sep-03-2010 20:36:54 PDT
Buy It Now for only: US $12.95
Bid now | Buy it now | Add to watch list


rare 1939 dodge 2 door...ATTN: WILL TAKE PAYMENTS!

US $1,875.00
End Date: Friday Sep-03-2010 20:36:57 PDT
Buy It Now for only: US $1,875.00
Buy it now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 & 2500 2003 03 5.9

US $19.95
End Date: Friday Sep-03-2010 20:36:59 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 2WD 1997 1998 1999

US $19.95
End Date: Friday Sep-03-2010 20:37:02 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


DODGE NEON 2.0L SOHC 95 96 97 98 99 PERFORMANCE HEADER

US $48.99
End Date: Friday Sep-03-2010 20:37:12 PDT
Buy It Now for only: US $48.99
Buy it now | Add to watch list


64 Dodge 330 PRO Thunderjet 500 Slot racer FREE SHIP

US $15.95 (0 Bid)
End Date: Friday Sep-03-2010 20:37:24 PDT
Bid now | Add to watch list


Xmods Dodge Challenger Rims and Tires

US $3.99 (0 Bid)
End Date: Friday Sep-03-2010 20:37:26 PDT
Bid now | Add to watch list


MOPAR 1969 PLYMOUTH DODGE COMPLETE PARTS MANUAL HEMI

US $149.99
End Date: Friday Sep-03-2010 20:37:32 PDT
Buy It Now for only: US $149.99
Buy it now | Add to watch list


Dodge 1957 1958 Royal Lancer Spinner Wheel Covers

US $110.00
End Date: Friday Sep-03-2010 20:37:33 PDT
Buy It Now for only: US $110.00
Buy it now | Add to watch list


HW 07 HOT WHEELS STARS #98 DODGE POWER WAGON HOTWHEELS

US $1.00
End Date: Friday Sep-03-2010 20:37:36 PDT
Buy It Now for only: US $1.00
Buy it now | Add to watch list


1970 DODGE CHALLENGER ***ORIGINAL 2 PAGE AD*** RARE!

US $5.95
End Date: Friday Sep-03-2010 20:37:36 PDT
Buy It Now for only: US $5.95
Buy it now | Add to watch list


MOPAR 1963 64 DODGE 330 EMBLEM SET MAX WEDGE HEMI

US $49.99
End Date: Friday Sep-03-2010 20:37:46 PDT
Buy It Now for only: US $49.99
Buy it now | Add to watch list


1964 Timken ad. Dodge Comet at Daytona

US $6.95
End Date: Friday Sep-03-2010 20:37:50 PDT
Buy It Now for only: US $6.95
Buy it now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 & 2500 2003 03 8.0

US $19.95
End Date: Friday Sep-03-2010 20:37:54 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 2WD 1997 1998 1999

US $19.95
End Date: Friday Sep-03-2010 20:37:56 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


2010 Hot Wheels Drag Strip Demons #1/25 '70 Dodge F/C

US $3.99 (0 Bid)
End Date: Friday Sep-03-2010 20:38:00 PDT
Buy It Now for only: US $4.50
Bid now | Buy it now | Add to watch list


02 03 04 05 DODGE RAM 1500 2500 3500 CHROME TAIL LIGHTS

US $22.99 (0 Bid)
End Date: Friday Sep-03-2010 20:38:05 PDT
Buy It Now for only: US $25.99
Bid now | Buy it now | Add to watch list


06-08 DODGE CHARGER HALO FOG LIGHTS lamps se sxt r/t 07

US $54.98
End Date: Friday Sep-03-2010 20:38:06 PDT
Buy It Now for only: US $54.98
Buy it now | Add to watch list


Dodge, Chrysler, Jeep Patriot Blue Touch-Up Paint OEM

US $7.95
End Date: Friday Sep-03-2010 20:38:09 PDT
Buy It Now for only: US $7.95
Buy it now | Add to watch list


DODGE RAM STAINLESS STEEL TEAL DIAL WATCH

US $12.95
End Date: Friday Sep-03-2010 20:38:21 PDT
Buy It Now for only: US $12.95
Buy it now | Add to watch list


DODGE RAM STAINLESS STEEL BLUE DIAL WATCH

US $12.95
End Date: Friday Sep-03-2010 20:38:22 PDT
Buy It Now for only: US $12.95
Buy it now | Add to watch list


DODGE RAM STAINLESS STEEL RED DIAL WATCH

US $12.95
End Date: Friday Sep-03-2010 20:38:25 PDT
Buy It Now for only: US $12.95
Buy it now | Add to watch list


1963 1964 Dodge Polara 500 Fuel Gas Sending Unit 5/16

US $59.95
End Date: Friday Sep-03-2010 20:38:28 PDT
Buy It Now for only: US $59.95
Buy it now | Add to watch list


MEN'S DODGE STAINLESS STEEL WATCH WITH BLUE DIAL

US $8.99
End Date: Friday Sep-03-2010 20:38:29 PDT
Buy It Now for only: US $8.99
Buy it now | Add to watch list


MEN;S DODGE GENUINE LEATHER WATCH WITH LUMINOUS HANDS

US $9.99
End Date: Friday Sep-03-2010 20:38:37 PDT
Buy It Now for only: US $9.99
Buy it now | Add to watch list


Transnational Business Problems by Vagts Dodge & Koh

US $23.95
End Date: Friday Sep-03-2010 20:38:39 PDT
Buy It Now for only: US $23.95
Buy it now | Add to watch list


MEN'S DODGE STAINLESS STEEL WATCH WITH BLUE DIAL

US $8.99
End Date: Friday Sep-03-2010 20:38:42 PDT
Buy It Now for only: US $8.99
Buy it now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 & 2500 2003 03 8.0

US $19.95
End Date: Friday Sep-03-2010 20:38:42 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


Dodge Neon SRT-4 95 96 97 HID 894 Yellow Fog Light Bulb

US $0.70 (0 Bid)
End Date: Friday Sep-03-2010 20:38:44 PDT
Buy It Now for only: US $1.50
Bid now | Buy it now | Add to watch list


DODGE RAM GOLD-TONE POCKET WATCH

US $12.99
End Date: Friday Sep-03-2010 20:38:45 PDT
Buy It Now for only: US $12.99
Buy it now | Add to watch list


DODGE RAM STAINLESS STEEL TEAL DIAL WATCH

US $12.95
End Date: Friday Sep-03-2010 20:38:45 PDT
Buy It Now for only: US $12.95
Buy it now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 2WD 1997 1998 1999

US $19.95
End Date: Friday Sep-03-2010 20:38:45 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


DODGE RAM STAINLESS STEEL RED DIAL WATCH

US $12.95
End Date: Friday Sep-03-2010 20:38:47 PDT
Buy It Now for only: US $12.95
Buy it now | Add to watch list


96 DODGE CARAVAN VOYAGER REAR WIPER MOTOR ON THE LID #O

US $39.00
End Date: Friday Sep-03-2010 20:38:48 PDT
Buy It Now for only: US $39.00
Buy it now | Add to watch list


69 71 73 Mopar Dodge Plymouth 426 440 Intake Manifold

US $72.95
End Date: Friday Sep-03-2010 20:38:54 PDT
Buy It Now for only: US $72.95
Buy it now | Add to watch list


2007 2008 DODGE CALIBER SE SXT R/T FOG LIGHT LAMP PAIR

US $58.99
End Date: Friday Sep-03-2010 20:38:54 PDT
Buy It Now for only: US $58.99
Buy it now | Add to watch list


50 Dodge map light bulbs

US $5.00
End Date: Friday Sep-03-2010 20:38:56 PDT
Buy It Now for only: US $5.00
Buy it now | Add to watch list


TAIL LIGHT dodge CALIBER 07-08 part auto NEW

US $53.50
End Date: Friday Sep-03-2010 20:38:58 PDT
Buy It Now for only: US $53.50
Buy it now | Add to watch list


DODGE CALIPER REAR TAIL LIGHT RH PASSAN SIDE USED 05 09

US $0.99 (0 Bid)
End Date: Friday Sep-03-2010 20:39:01 PDT
Bid now | Add to watch list


1/25 Scale AMT DODGE STEALTH R/T MIB SEALED KIT

US $16.00
End Date: Friday Sep-03-2010 20:39:22 PDT
Buy It Now for only: US $16.00
Buy it now | Add to watch list


maisto1970 dodge challengerr rt

US $0.99 (0 Bid)
End Date: Friday Sep-03-2010 20:39:23 PDT
Bid now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 & 2500 2003 03 8.0

US $19.95
End Date: Friday Sep-03-2010 20:39:30 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


PERFORMANCE CHIP FOR DODGE RAM 1500 2WD 1998 1999 2000

US $19.95
End Date: Friday Sep-03-2010 20:39:33 PDT
Buy It Now for only: US $19.95
Buy it now | Add to watch list


02 03 04 05 06 07 08 DODGE RAM 1500 PICKUP COIL/IGNITOR

US $25.00
End Date: Friday Sep-03-2010 20:39:34 PDT
Buy It Now for only: US $25.00
Buy it now | Add to watch list


maisto 1969 dodge charger

US $0.99 (0 Bid)
End Date: Friday Sep-03-2010 20:39:34 PDT
Bid now | Add to watch list


1965 DODGE CHARGER CORONET PLYMOUTH BARRACUDA LICENSE

US $9.99
End Date: Friday Sep-03-2010 20:39:35 PDT
Buy It Now for only: US $9.99
Buy it now | Add to watch list


maisto 1969 dodge charger

US $0.99 (0 Bid)
End Date: Friday Sep-03-2010 20:39:36 PDT
Bid now | Add to watch list


1965 FORD MERCURY LINCOLN PLYMOUTH DODGE LICENSE PLATE

US $9.99
End Date: Friday Sep-03-2010 20:39:37 PDT
Buy It Now for only: US $9.99
Buy it now | Add to watch list


maisto 1969 dodge charger

US $0.99 (0 Bid)
End Date: Friday Sep-03-2010 20:39:39 PDT
Bid now | Add to watch list


maisto 1969 dodge charger

US $0.99 (0 Bid)
End Date: Friday Sep-03-2010 20:39:42 PDT
Bid now | Add to watch list


maisto 1969 dodge charger

US $0.99 (0 Bid)
End Date: Friday Sep-03-2010 20:39:45 PDT
Bid now | Add to watch list