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HEMI in NHRA T/F,F/C,TAD,TAFC #1107340 11/04/11 11:11 PM 11/04/11 11:11 PM
Joined: May 2005 Posts: 304 Enfield, Ct Moe OP enthusiast
Moe OP enthusiast Joined: May 2005 Posts: 304 Enfield, Ct	HEMI in NHRA T/F,F/C,TAD,TAFC. What is the reason why the HEMI is the choice of engines. It will stay together @ 8000 Hp? It has superior dentonation characteristics? Ford & GM won't work in these applications? Need a good detailed answer for the guys at work. "Google" Won't give me an answer. THANKS!

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: Moe] #1107341 11/05/11 07:28 AM 11/05/11 07:28 AM
Joined: Jan 2003 Posts: 20,183 Park Forest, IL slantzilla Too Many Posts
slantzilla Too Many Posts Joined: Jan 2003 Posts: 20,183 Park Forest, IL	Because it is the only engine allowed by the NHRA. "Everybody funny, now you funny too."

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: Moe] #1107342 11/05/11 09:51 AM 11/05/11 09:51 AM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Because it looks cool?

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: Challenger 1] #1107343 11/05/11 10:18 AM 11/05/11 10:18 AM
Joined: Jan 2003 Posts: 11,397 NJ rdrnr6970 Your #1 source for current events
rdrnr6970 Your #1 source for current events Joined: Jan 2003 Posts: 11,397 NJ	because years ago the hemis were beating everybody...they had the most horsepower,when placed in vehicles they were the fastest.racers found out the hemispherical combustion chambers,the motor set up, in these mosters couldnt be beat! OWNER OF EVERYTHING FROM 1956 300 B,IMPERIAL,NEW YORKER HEMIS,AND NEW HEMI TRUCKS.....5TH GENRAMS.COM... 1969/70 ROADRUNNERS ,DARTS/CORONETS, NORTHEAST HEMI OWNERS ASSOCIATION.....WWW.PHANTASMCUDAS.COM....MOPAR FAMILY FOR 50 YEARS AND STILL GOING!MOPAR OWNER COAST TO COAST!!!!

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: rdrnr6970] #1107344 11/05/11 10:19 AM 11/05/11 10:19 AM
Joined: Jan 2003 Posts: 11,397 NJ rdrnr6970 Your #1 source for current events
rdrnr6970 Your #1 source for current events Joined: Jan 2003 Posts: 11,397 NJ	amd YES...HEMI motors look cool! OWNER OF EVERYTHING FROM 1956 300 B,IMPERIAL,NEW YORKER HEMIS,AND NEW HEMI TRUCKS.....5TH GENRAMS.COM... 1969/70 ROADRUNNERS ,DARTS/CORONETS, NORTHEAST HEMI OWNERS ASSOCIATION.....WWW.PHANTASMCUDAS.COM....MOPAR FAMILY FOR 50 YEARS AND STILL GOING!MOPAR OWNER COAST TO COAST!!!!

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: rdrnr6970] #1107345 11/05/11 10:33 AM 11/05/11 10:33 AM
Joined: Nov 2009 Posts: 2,177 ill D dennismopar73 top fuel
dennismopar73 top fuel D Joined: Nov 2009 Posts: 2,177 ill	I was going to say something like ,, no-one designs motors here anymore! now its built on someones computor in japan or china. same as the cars platform , car makers used to have designers, now they leave that to the jackets they wear

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: dennismopar73] #1107346 11/05/11 10:52 AM 11/05/11 10:52 AM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	I think it's because of the huge port design of the hemi, epecially with aftermarket heads like these. Combine that with 60 pounds of boost like this engine sees=3000hp on alcohol!!

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: Challenger 1] #1107347 11/05/11 11:21 AM 11/05/11 11:21 AM
Joined: Jan 2003 Posts: 11,397 NJ rdrnr6970 Your #1 source for current events
rdrnr6970 Your #1 source for current events Joined: Jan 2003 Posts: 11,397 NJ	OWNER OF EVERYTHING FROM 1956 300 B,IMPERIAL,NEW YORKER HEMIS,AND NEW HEMI TRUCKS.....5TH GENRAMS.COM... 1969/70 ROADRUNNERS ,DARTS/CORONETS, NORTHEAST HEMI OWNERS ASSOCIATION.....WWW.PHANTASMCUDAS.COM....MOPAR FAMILY FOR 50 YEARS AND STILL GOING!MOPAR OWNER COAST TO COAST!!!!

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: Challenger 1] #1107348 11/05/11 11:26 AM 11/05/11 11:26 AM
Joined: Nov 2009 Posts: 2,177 ill D dennismopar73 top fuel
dennismopar73 top fuel D Joined: Nov 2009 Posts: 2,177 ill	We all know what the Hemi does,, but why hasn't Ford,,, Chevy,,, tried to put some type of engine that would at least compete with the Hemi?? The Hemi that is being used , is just a distant relative of the original Hemi.

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: dennismopar73] #1107349 11/05/11 11:44 AM 11/05/11 11:44 AM
Joined: Jan 2003 Posts: 11,397 NJ rdrnr6970 Your #1 source for current events
rdrnr6970 Your #1 source for current events Joined: Jan 2003 Posts: 11,397 NJ	ford did try in 69 with the BOSS 429,hemi configuration.limited sales,and the expense of the motor and its development,prob led to its demise.chevy tried too,their was a smokey yunik built( i think)302?or 307?cross ram hemi,that was put in a 68/69 camaro,but never worked out. OWNER OF EVERYTHING FROM 1956 300 B,IMPERIAL,NEW YORKER HEMIS,AND NEW HEMI TRUCKS.....5TH GENRAMS.COM... 1969/70 ROADRUNNERS ,DARTS/CORONETS, NORTHEAST HEMI OWNERS ASSOCIATION.....WWW.PHANTASMCUDAS.COM....MOPAR FAMILY FOR 50 YEARS AND STILL GOING!MOPAR OWNER COAST TO COAST!!!!

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: rdrnr6970] #1107350 11/05/11 01:08 PM 11/05/11 01:08 PM
Joined: Mar 2003 Posts: 4,848 Memphis HemiRick master
HemiRick master Joined: Mar 2003 Posts: 4,848 Memphis	The reason why Hemis dominate the Nitro classes is because they are the only engine with a port design good enough to keep the exhaust valves from melting. During the overlap period enough air goes thru them to cool the exhaust valve for the next stroke. Take care, Rick 68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: slantzilla] #1107351 11/05/11 03:38 PM 11/05/11 03:38 PM
Joined: Jan 2003 Posts: 12,120 City of Champions P Prostock I Live Here
Prostock I Live Here P Joined: Jan 2003 Posts: 12,120 City of Champions	Quote: Because it is the only engine allowed by the NHRA. No other engines are permitted.

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: Moe] #1107352 11/06/11 12:00 AM 11/06/11 12:00 AM
Joined: Mar 2003 Posts: 600 Spartanburg SC MoparDan mopar
MoparDan mopar Joined: Mar 2003 Posts: 600 Spartanburg SC	In the 60's and 70's TF and FC ran motors of all makes...The 392H (& Donovan 417) and later 426H proved to BE the motors to lead the pack for several reasons: as mentioned, with more and more nitro being used in the 60's/70's they stayed together better/longer than the others; the chrysler hemispherical combustion chamber design was the best, particularly in blower application. As side note- the hemi was competitive in the early years of PS, but later with rpms above 8500 and in normally aspirated motors... in PS the Hemi was inefficent. BUT with a blower attached- NOTHING could touch the Hemi and it's combustion design. Fast forward 10 or so years when no other motor would would even try to compete in FT/FC, NHRA deemed the Hemi was king! and made it the standard.

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: MoparDan] #1107353 11/06/11 12:37 AM 11/06/11 12:37 AM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	NHRA killed the hemi in pro stock by assigning it a very uncompetitive weight break.. so with the swipe of a pen the 426 hemi was dead in pro stock...after several years of trying..all further development on the PS hemi was stopped.. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: 70AARcuda] #1107354 11/06/11 12:53 AM 11/06/11 12:53 AM
Joined: Jan 2003 Posts: 20,183 Park Forest, IL slantzilla Too Many Posts
slantzilla Too Many Posts Joined: Jan 2003 Posts: 20,183 Park Forest, IL	Quote: NHRA killed the hemi in pro stock by assigning it a very uncompetitive weight break.. so with the swipe of a pen the 426 hemi was dead in pro stock...after several years of trying..all further development on the PS hemi was stopped.. Not completely true. NHRA went to 500ci for everyone and the Hemi just could not compete with the wedges. Jeff Wick kept trying until the late '90's. Even Bob Glidden had to give up on the Shotgun motor. "Everybody funny, now you funny too."

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: slantzilla] #1107355 11/06/11 01:14 AM 11/06/11 01:14 AM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: Quote: NHRA killed the hemi in pro stock by assigning it a very uncompetitive weight break.. so with the swipe of a pen the 426 hemi was dead in pro stock...after several years of trying..all further development on the PS hemi was stopped.. Not completely true. NHRA went to 500ci for everyone and the Hemi just could not compete with the wedges. Jeff Wick kept trying until the late '90's. Even Bob Glidden had to give up on the Shotgun motor. NHRA instituted the ps weight breaks in 1972...chrysler pulled the plug on the hemi a couple years later....nhra went to 500 inch motors in 1982... yes a few people continue to run the hemi...but once the factory money stopped...no one was doing any R&D... a SS/HA hemi today turns over 9000 rpm with the new valvetrain that has been developed.. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: 70AARcuda] #1107356 11/06/11 01:51 AM 11/06/11 01:51 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Quote: Quote: Quote: NHRA killed the hemi in pro stock by assigning it a very uncompetitive weight break.. so with the swipe of a pen the 426 hemi was dead in pro stock...after several years of trying..all further development on the PS hemi was stopped.. Not completely true. NHRA went to 500ci for everyone and the Hemi just could not compete with the wedges. Jeff Wick kept trying until the late '90's. Even Bob Glidden had to give up on the Shotgun motor. NHRA instituted the ps weight breaks in 1972...chrysler pulled the plug on the hemi a couple years later....nhra went to 500 inch motors in 1982... yes a few people continue to run the hemi...but once the factory money stopped...no one was doing any R&D... a SS/HA hemi today turns over 9000 rpm with the new valvetrain that has been developed.. That is so true as the Hemi Dominated Pro Stock in the 70 to 72 Era. The added weight in 72 slowed them down and Wally Parks of NHRA even told some of the racers they wanted more GM and Fords to win and not the Mopars all the time so they made the Hemi's run heavier cars then GM and Ford. So politics is even in racing. Then Bill Jenkins was allowed to run his tube frame Vega at the 72 Winter Nationals and everything Changed in Pro Stock. On a side note the best eng that ran as good as the Mopar Hemi was the SOHC 427 Ford eng. But they never put it in a production car and it did not stay together as well as the Hemi. When Don Nicholson had his 427 SOHC eng Maverick in the 70 to 72 Pro Stock era running good it could run with the 426 Hemi but it was hard to keep it running great and parts were scarce for it since it was never a production eng. And Mickey Thompson had the 427 SOHC in his Funny Car Mustang in 69 and 70 and it ran as good as the Hemi when it ran right. It had overhead cams and it was a Hemi and it could rev good with the overhead cams. Also NASCAR would not let Ford use it so thats why Ford went to the Boss 429 pushrod semi Hemi eng. Ron Last edited by 383man; 11/06/11 01:54 AM.

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: 383man] #1107357 11/06/11 09:57 AM 11/06/11 09:57 AM
Joined: Jul 2004 Posts: 3,811 Arlington, Texas B bobby66 master
bobby66 master B Joined: Jul 2004 Posts: 3,811 Arlington, Texas	I remember seeing a 427SOHC in a F/C many years ago. What a cool looking engine!

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: Moe] #1107358 11/06/11 03:12 PM 11/06/11 03:12 PM
Joined: Jan 2003 Posts: 25,842 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,842 Rio Linda, CA	Quote: HEMI in NHRA T/F,F/C,TAD,TAFC. What is the reason why the HEMI is the choice of engines. The Hemi is easier than others to maintain, other designs require too much time to teardown/reassemble between rounds. The INTERNET, the MISinformation superhighway

Re: HEMI in NHRA T/F,F/C,TAD,TAFC [Re: John_Kunkel] #1107359 11/06/11 03:33 PM 11/06/11 03:33 PM
Joined: Feb 2003 Posts: 8,020 Pangaea B5 Bee master
B5 Bee master Joined: Feb 2003 Posts: 8,020 Pangaea	By 1990, the 426 Hemi type motors were the only motor being used in the nitro classes for reasons given above (ease of maintainence and performance using a blower and nitro). The 426 Hemi rule came not long after Bernstein invested in and was testing the McGee 4valve OHC motor. The Hemi only rule was to slow the rising costs of running in the nitro classes. Best I recall, the last TF car that won a National event (Springs I think) that wasn't 392 or 426 based, was Jim Bucher's Chevy. He was an underdog favorite, ran 3 or 4 years in the early '70s on a small budget, a Chevy motor and still managed to win some rounds.

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