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12-01-2006, 08:09 AM
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CC Member
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Join Date: Nov 2006
Location: dallas,
tx
Cobra Make, Engine:
Posts: 24
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Not Ranked
a motor my proffeser refered to as a fordhemi
i know hemi is dodge product but my proffeser swears ford made a version a hemi and i get to do a reaserch paper on it i canot seem to find any infortmation on it if you know or know someone who does i need a the info i can get thanks and hello
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12-01-2006, 08:11 AM
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Senior Club Cobra Member
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Join Date: Aug 2005
Location: Toronto, Canada,
Ont
Cobra Make, Engine: Shelby CSX 4995, Keith Craft built 427 SO
Posts: 1,168
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Not too sure about this, but wasn't the Boss 429 considered a Hemi. 
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"The 427 Cobra is easily the highest performance car ever sold for street use. A decent 427 - not the worst, not the best, will go from zero to 100 mph and back down again to zero in less than 14 seconds. All thing considered, you can put together a pretty good argument that the 427 Cobra is the ultimate performance car, judged on any basis you want to name." Taken from; Corvette, The Sensuous American 
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12-01-2006, 08:17 AM
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CC Member
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Join Date: Apr 2001
Location: San Diego,
CA
Cobra Make, Engine:
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427 FE SOHC, built in '65 was a hemi-head engine. They were sold over the counter at Ford dealerships as crate motors. Originally intended for NASCAR, they did not meet homologation rules and instead they went on to drag racing fame through that time period.
Boss 429 is a semi-hemi. Combustion chamber is only partially hemispherical.
Your professor has good taste.
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Bill Malone
Gashole
CSX4786
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12-01-2006, 08:23 AM
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CC Member
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Join Date: Apr 2001
Location: San Diego,
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BTW, SOHC stands for single overhead cam. Meaning this motor had a single overhead cam per head. That is what made it unique; motors of the time were overhead valve using lifters and pushrods.
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Bill Malone
Gashole
CSX4786
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12-01-2006, 08:57 AM
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CC Member
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Join Date: Nov 2000
Location: Flower Mound, TX,
tx
Cobra Make, Engine: Lonestar LS 427, Keith Craft 501,Toploader
Posts: 883
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Most all your big time drag cars with Ford engines have custom made hemis. Look at Jon Kaase's website to check them out.
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" It ain't no big deal" 
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12-01-2006, 08:57 AM
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CC Member
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Join Date: Jul 2000
Location: Shreveport,
LA
Cobra Make, Engine: CSX4083, NOS 427 SOHC, serial number 589. Dyno'd in 1967 at 629HP with single 4v 560 Holley. Now with 4 Webers.
Posts: 295
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And here it is:
The entire article can be found in my gallery. Also, you can get a Society of Automotive Engineers technical paper on the motor at their website, the paper is titled "The Ford 427 Cubic Inch Single Overhead Cam Engine" by Faustyn and Eastman, May, 1965
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12-01-2006, 09:01 AM
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CC Member
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Join Date: Jul 2000
Location: Shreveport,
LA
Cobra Make, Engine: CSX4083, NOS 427 SOHC, serial number 589. Dyno'd in 1967 at 629HP with single 4v 560 Holley. Now with 4 Webers.
Posts: 295
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12-01-2006, 09:03 AM
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CC Member
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Join Date: Jul 2000
Location: Shreveport,
LA
Cobra Make, Engine: CSX4083, NOS 427 SOHC, serial number 589. Dyno'd in 1967 at 629HP with single 4v 560 Holley. Now with 4 Webers.
Posts: 295
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SOHC motor number #589 in CSX4083:
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12-01-2006, 09:43 AM
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CC Member
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Join Date: Feb 2002
Location: Bradenton Florida,
FL
Cobra Make, Engine: BDR 930, 427 Windsor T56
Posts: 658
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Dang, looks like your research is done.
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Jim Pomroy
Have Fun!
BDR #930
08 Corvette Coupe
92 Sunburst Yellow Miata
#81 Saturn V Miata Crapcan racer
Panoz GTRA #42
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12-01-2006, 09:45 AM
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Senior Club Cobra Member
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Join Date: Jul 2002
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A+ guys, you nailed this one down. Hey, that was TO easy!  |
12-01-2006, 09:52 AM
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Quote:
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Originally Posted by Tim Brewer
Most all your big time drag cars with Ford engines have custom made hemis. Look at Jon Kaase's website to check them out.
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I used the past tense--that is, the 60's.
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Bill Malone
Gashole
CSX4786
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12-01-2006, 10:36 AM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Southern Connecticut,
CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
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I could be incorrect, but if the spark plug isn't right down the center I would think it's not a pure hemi.
Bob
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12-01-2006, 10:47 AM
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Semantically, you may be correct--I don't know. Here is a photo to illustrate Bob's point.
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Bill Malone
Gashole
CSX4786
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12-01-2006, 10:54 AM
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The term hemi refers to the shape of the combustion chamber, a half sphere, not the plug location.
All though the point is well noted. The CLASSIC Chrysler Hemi and others do place the plug dead center. In my opinion, this does not alter the fact it is a true hemi regardless of plug location. The BIG advantage a Hemi offers is 'cross flow'. Intake on one side and exhaust flowing out the other side, this is a very smooth transition for the flowing gases. The exiting exhaust velocity helps to 'draw in' the fresh intake air charge.
Last edited by Excaliber; 12-01-2006 at 10:56 AM..
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12-01-2006, 10:59 AM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Southern Connecticut,
CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
Posts: 2,105
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The hemi head engine has 2 big advantages over a wedge head engine. The first is it breaths better, the second is the fuel burn (flame progression) is even through the whole power stroke. When the plug is off to the side, some power is lost due to uneven burn.
Bob
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12-01-2006, 11:00 AM
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Senior Club Cobra Member
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Join Date: Dec 2000
Location: Chandler,
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Cobra Make, Engine: 396W Kirkham KMPS036
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I thought its a "hemi" as long as it had hemisperical combustion chambers. You can put the plug anyplace it will fit. I think the center mounted plugs (Chrysler, Alfa Romeo, etc) probably had a better flame front propagation.
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Bob McLinden
ERA FIA 2080 SOLD
Kirkham KMPS036
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12-01-2006, 11:06 AM
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CC Member
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Join Date: May 2004
Location: Palm Coast,
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Cobra Make, Engine: Shelby American CSX 4241 - authentically built
Posts: 2,573
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A couple other things that you can look into that would add some good quality to your paper...
While Dodge is using the HEMI name on these new motors, my understanding is that they are not actually hemispherical chambers. I am not sure on that, just what I heard. Might be worth looking into.
Also, Ford's 4.6 DOHC (DUAL overhead cam) motor is a hemi. It's a modern version, with 4 vales per cylinder, and a central plug. You could use that for your paper to tie old technology vs new.
And one last Hemi fact.... Dodge built ONE 4 valve per chamber 426 Hemi in the 60s. This motor was Dodge's answer to the Ford 427 SOHC. You may still be able to find info on it. I remember a magazine article from the late 80s (I think) about it, titled "the hemi that never was".
Hope this helps.
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Sal Mennella
CSX 4241, KMP 357 - sold and missed, CSX 4819 - cancelled, FFR 5132 - sold
See my car at CSXinfo.net here >> CSX 4241
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12-01-2006, 11:28 AM
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CC Member
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Join Date: Jul 2000
Location: Shreveport,
LA
Cobra Make, Engine: CSX4083, NOS 427 SOHC, serial number 589. Dyno'd in 1967 at 629HP with single 4v 560 Holley. Now with 4 Webers.
Posts: 295
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Not Ranked
As stated above, spark plug location has nothing to do with a motor being a hemi or not. In the above referenced SAE technical paper, page 12 under Combustion Chamber Design it states "The optimum location for equidistant flame travel is the geometric center..." Obviously, the centrally located camshaft prevents this location from being used. Interestingly, the "First Series" motors had the spark plug on the opposite side of the head, but testing of flow caused it to be relocated to the final location in the "Second Series" of SOHC engines.
Clearly, so that the motor can develop its full potential and the spark plug location design flaw that is inherent with the Single Overhead Cam design be corrected, the answer is a Cammer head that has Dual Overhead Cams!!!
At the same time, a gear drive can replace the chain, here is a one of a kind system built for a cammer motor going in a boat:
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12-01-2006, 11:40 AM
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Senior Club Cobra Member
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Join Date: Feb 2005
Cobra Make, Engine: Contemporary, FE, Tremec TKO 600
Posts: 1,974
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Just curious - is the block for a SOHC the same block as a normal 427FE? Does anyone currently make SOHC heads new? I guess the question here is, can you actually build one of these engines new now, or do you need to go around rounding up rare old parts?
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12-01-2006, 11:41 AM
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Senior Club Cobra Member
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Join Date: Jun 1999
Location: Dublin,
CA
Cobra Make, Engine: TBD
Posts: 1,298
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Hmmmmmm
Interesting question and Club cobra comes back with all the right answers.
Who is hotrod211 from Dallas and this is his first post and nothing since?
TR
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