http://www.allpar.com/mopar/hemi/hellcat.html
http://www.dpccars.com/gallery/index.ph ... rvette-ZR1
http://blog.caranddriver.com/ten-shades ... llcat-v-8/
IS the hellcat engine impressive!!
yes without a doubt, its darn impressive engineering and exceptional engine engineering,
but that being said,its not something that the other manufactures engines can,t be modified compete with on an equal power produced basis, it just takes a bit more displacement for the older slightly less efficient engine designs, to compensate for the exceptionally good hemi engine design.
Spec Measure
Bore x Stroke 4.09 x 3.58 (104 x 91) (ROUGHLY 373 CUBIC INCHES)
Compression 9.5:1
Max power 707 hp at 6,000 rpm (SAE net)
Torque 650 lb-ft @ 4,800 rpm
Fuel 91 octane (premium) (R+M)/2
Oil 7.5 quarts / 7.1 liters, 0W-40 synthetic
Coolant 14 quarts (13.25 liters)
The 5.7L Hemi makes its 410 lb-ft. peak torque at 4,800RPM; the Hellcat makes 411 kb-ft at 1,200RPM.
90% of the engine parts are new in the Hellcat.
The 2.4L IHI supercharger runs 14,600RPM at just over 11PSI. of boosted intake pressure
The engine flows 30,000 liters of air per minute.
It takes 80 horsepower just to drive the supercharger.
The Hellcat actually makes more than 800 horsepower, gross, but is SAE certified at the crank for 707.
There are 21,000 lb of load on each piston; they use diamond coated piston pins.
Each supercharged Hemi is dyno-tested for 42 minutes for loads up to 90% at 5,200RPM.
Special injectors flow 600cc/minute and can fill a pint glass in 7 seconds.
The 8-speed auto capacity was upgraded by 30%, using new disks.
The 6-speed manual is used in the Viper, but has internal coolers with Hellcat.
The ECU is locked by Chrysler, so if the aftermarket wants to make modifications, they will need to supply their own controllers.
I see a good many people seem astonished at the fact that the dodge hemi with a supercharger makes 707 hp
but a LS engine or big block chevy of a bit larger displacement has a similar potential if turbo or supercharged, with the correctly selected parts, it would be very easy to exceed those power numbers with carefully selected components in a custom built inter-cooled turbo build, and do it for less cash than the HELLCAT CAR sells for and theres N/A crate engines available now that exceed those numbers easily. put 11 pounds of boost on a serious SBC...
yes the "HEMI" heads where the valves are less shrouded and the breathing is slightly improved,if you paid attention the NEW HEMI engines bested the ENGINE MASTER CHALLENGE,based on hp per cubic inch of displacement, but look carefully the other designs are not that far behind, and if larger displacement is selects they don,t keep up
HEMIS WERE MAKING ABOUT 1.7 hp per cubic inch
LS CHEVY WERE MAKING ABOUT 1.65 hp per cubic inch
BBC CHEVY WERE MAKING ABOUT 1.59 hp per cubic inch
viewtopic.php?f=69&t=10655
a bit of simple math shows that any of the other engine designs assembled with the best competitive parts should easily compete , to produce similar or better power if the displacement exceeds 415-420 cid and all the other factors like boost are similar
http://www.hotrod.com/how-to/engine/140 ... -and-wild/
THEY are a slight advantage but that's one factor that's easily compensated for with a slightly larger displacement, and the better LS and BBC heads can produce amazing results
viewtopic.php?f=86&t=1397
now theres no doubt thats impressive from a production, off the show room floor street license-able, and in theory street drive-able car.
but its not quite as impressive when you look at the cost vs building something custom, or looking over the options in crate engines, for you hot rod.
http://www.chevrolet.com/performance/cr ... 454-r.html
http://www.chevrolet.com/performance/cr ... 720-r.html
http://www.shafiroff.com/chevy_crate_en ... igdawg.php
http://www.shafiroff.com/chevy_crate_en ... ted_hr.php
http://www.shafiroff.com/chevy_crate_en ... d_sr20.php
http://www.dpccars.com/gallery/index.ph ... rvette-ZR1
http://blog.caranddriver.com/ten-shades ... llcat-v-8/
IS the hellcat engine impressive!!
yes without a doubt, its darn impressive engineering and exceptional engine engineering,
but that being said,its not something that the other manufactures engines can,t be modified compete with on an equal power produced basis, it just takes a bit more displacement for the older slightly less efficient engine designs, to compensate for the exceptionally good hemi engine design.
Spec Measure
Bore x Stroke 4.09 x 3.58 (104 x 91) (ROUGHLY 373 CUBIC INCHES)
Compression 9.5:1
Max power 707 hp at 6,000 rpm (SAE net)
Torque 650 lb-ft @ 4,800 rpm
Fuel 91 octane (premium) (R+M)/2
Oil 7.5 quarts / 7.1 liters, 0W-40 synthetic
Coolant 14 quarts (13.25 liters)
The 5.7L Hemi makes its 410 lb-ft. peak torque at 4,800RPM; the Hellcat makes 411 kb-ft at 1,200RPM.
90% of the engine parts are new in the Hellcat.
The 2.4L IHI supercharger runs 14,600RPM at just over 11PSI. of boosted intake pressure
The engine flows 30,000 liters of air per minute.
It takes 80 horsepower just to drive the supercharger.
The Hellcat actually makes more than 800 horsepower, gross, but is SAE certified at the crank for 707.
There are 21,000 lb of load on each piston; they use diamond coated piston pins.
Each supercharged Hemi is dyno-tested for 42 minutes for loads up to 90% at 5,200RPM.
Special injectors flow 600cc/minute and can fill a pint glass in 7 seconds.
The 8-speed auto capacity was upgraded by 30%, using new disks.
The 6-speed manual is used in the Viper, but has internal coolers with Hellcat.
The ECU is locked by Chrysler, so if the aftermarket wants to make modifications, they will need to supply their own controllers.
I see a good many people seem astonished at the fact that the dodge hemi with a supercharger makes 707 hp
but a LS engine or big block chevy of a bit larger displacement has a similar potential if turbo or supercharged, with the correctly selected parts, it would be very easy to exceed those power numbers with carefully selected components in a custom built inter-cooled turbo build, and do it for less cash than the HELLCAT CAR sells for and theres N/A crate engines available now that exceed those numbers easily. put 11 pounds of boost on a serious SBC...
yes the "HEMI" heads where the valves are less shrouded and the breathing is slightly improved,if you paid attention the NEW HEMI engines bested the ENGINE MASTER CHALLENGE,based on hp per cubic inch of displacement, but look carefully the other designs are not that far behind, and if larger displacement is selects they don,t keep up
HEMIS WERE MAKING ABOUT 1.7 hp per cubic inch
LS CHEVY WERE MAKING ABOUT 1.65 hp per cubic inch
BBC CHEVY WERE MAKING ABOUT 1.59 hp per cubic inch
viewtopic.php?f=69&t=10655
a bit of simple math shows that any of the other engine designs assembled with the best competitive parts should easily compete , to produce similar or better power if the displacement exceeds 415-420 cid and all the other factors like boost are similar
http://www.hotrod.com/how-to/engine/140 ... -and-wild/
THEY are a slight advantage but that's one factor that's easily compensated for with a slightly larger displacement, and the better LS and BBC heads can produce amazing results
viewtopic.php?f=86&t=1397
now theres no doubt thats impressive from a production, off the show room floor street license-able, and in theory street drive-able car.
but its not quite as impressive when you look at the cost vs building something custom, or looking over the options in crate engines, for you hot rod.
http://www.chevrolet.com/performance/cr ... 454-r.html
http://www.chevrolet.com/performance/cr ... 720-r.html
http://www.shafiroff.com/chevy_crate_en ... igdawg.php
http://www.shafiroff.com/chevy_crate_en ... ted_hr.php
http://www.shafiroff.com/chevy_crate_en ... d_sr20.php
Last edited by a moderator:
