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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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Not too sure about this, but wasn't the Boss 429 considered a Hemi.:confused:
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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. |
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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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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And here it is:
http://www.clubcobra.com/photopost/d...65-Article.gif 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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SOHC motor number #589 in CSX4083:
http://www.clubcobra.com/photopost/d..._Cobra_035.jpg |
Dang, looks like your research is done.
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A+ guys, you nailed this one down. Hey, that was TO easy! :LOL:
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Quote:
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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 |
Semantically, you may be correct--I don't know. Here is a photo to illustrate Bob's point.
http://i86.photobucket.com/albums/k1...riousParts.jpg |
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. |
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 |
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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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. |
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: http://www.clubcobra.com/photopost/d...ar_drive_1.jpg |
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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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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