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UPDATE :: Return of the Pushrod | Ford's New 7.3L Engine is Actually an OHV V8

Discussion in 'Front Page Articles' started by SID297, May 29, 2018.

  1. SID297

    SID297 OWNER/ADMIN Staff Member Administrator

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    UPDATE :: Return of the Pushrod | Ford's New 7.3L Engine is Actually an OHV V8

    7.3L_OHV_V8_003.jpg


    I'm not sure how to even begin this. Recently I posted what I thought was a well thought-out speculation on what exactly this new 7.3L Gas Engine from Ford could be. To me, the most logical this was an update of the venerable 6.8L V10 for the HD Truck, Commercial, and Motorhome markets. After a lengthy discussion with a behind the scenes source it would appear that I was wrong. Very WRONG.


    According to my sources on the inside the new 7.3L is actually the first in a new series of V8 engines that will feature pushrod valve actuation instead of the OHC configuration we've become accustomed to. I know, it sounds insane. I'm having a hard time coming to grips with it myself. However, I trust the source of the info and I have heard rumors of pushrod experimentation inside the Blue Oval for a couple of years; I just had dismissed them.


    7.3L_OHV_V8_001.jpg
    It's been a long time since we had a cylinder head like this installed on a new factory Ford engine.


    So at this time it appears that this engine will first land in the F-Series for 2020. Word has it that the 6.8L V10 was going to need some major work to meet ever tightening emissions and Ford wanted a less expensive and easier to package engine. Like I mentioned in the previous article, the modular V10 is an enormous engine. However, the 4V V8 Modulars don't trail very far behind with their excessive girth. Certainly, one thing that has always be an advantage of the cam-in-block engines was their ability to squeeze more cubic inches into a smaller package.


    We were told that cost and packaging were Ford's major concerns when designing this engine. I would say that they'll tick both of those boxes by going from a SOHC V10 to a Pushrod V8. I suspect the overall package size to be somewhere between the other OHC engines on the market. There's no word hey on the combustion chamber design or valve layout, but I wouldn't be surprised to see Ford use a form of the modified-hemi design they used in the Boss 429 and the current 6.2L V8. It allows for the use of supersized valves and can produce massive airflow. I expect the heads will be aluminum.


    7.3L_OHV_V8_006.jpg
    Wedge, Semi-Hemi, Canted Valves, Pent Roof, 2V,3V, 4V, Etc.? The head design is yet to be revealed.


    As for the block, word is that it will be traditional grey iron or possibly Compacted Graphite Iron("CGI"). The 6.2L and the 6.8L both use standard iron block, which have the benefit of being fairly cheap while still being very tough. Also, with the introduction of the FRPP Boss 302 and 351 engine blocks Ford showed that they know how to cast a modern, strong, and economical iron pushrod block. Conversely, Ford's use of CGI has been growing over the past several years. Both the 6.7L Powerstroke and the 2.7L EcoBoost feature CGI blocks. It's not out of the realm of possibility for Ford to cast this new 7.3L block in strong, light-weight, CGI.


    7.3L_OHV_V8_004.jpg
    Being a truck engine, there's a very good chance the block will be an iron alloy of some type.


    Clearly, the competition for this engine will be the GM LS/LT engines and Mopar's HEMIs. Currently, the two engines this 7.3L mill will face down in the 3/4-1 Ton truck market is the 320HP/380TQ L96 6.0L V8 and the 410HP/429TQ 6.4L HEMI V8. Ford's current 6.4L Boss/Hurricane V8 generates 385HP/430TQ and the 6.8L 3V V10 churns out 320HP/460TQ. However, with this new engine packing in 7.3L of displacement I would expect it out muscle everything mentioned above.


    7.3L_OHV_V8_002.jpg
    Remember, the Hellcat started life as a truck engine too.

    The next question has to be, will there be a performance version of this engine? Well, the HEMI started out as a truck engine in the Ram 2500, now in Demon form the HEMI cranks out 808HP. So is it possible that we may see a Hi-Po version of the 7.3 plopped between the frame rails of a future Raptor or Mustang variant? I'd have to say 'yes', the possibility is definitely there. I haven't heard any concrete info on that development yet, but hopefully Ford has learned their lesson from the 6.2L V8. Don't let this new V8 languish in one basic form.


    One other thing I asked about, because it has to come to mind when you're talking about an engine that displaces 7.3L, is whether or not this thing is a Big-Block or Small-Block? None of the people I talked to had an answer for that one. I would suspect it is a Small-Block, especially if packaging was a concern. GM seems to be able to stretch the LSX block out to 8.4L, so it would make sense that Ford wouldn't need a Big-Block to get to 7.3L. However, there is the possibility that Ford may split the baby and wind up somewhere in between. There's certainly precedence for that outcome. Anyone remember the Cleveland V8s?


    7.3L_OHV_V8_007.jpg
    Tumble-Port, Swirl-Port, or Drain Pipe Sized; Ford has lots of options for port deign.

    Finally, I know the big questions are still left to be answered, but I will leave you with one last bit of speculation. The last time we saw a 7.3L engine in a Ford -F-Series truck it was the 2003 Powerstroke Diesel. That engine in its most powerful form made 275HP and 525TQ. I expect that when the 2020 model hits the new gasoline 7.3 V8 will make as much torque as the old 7.3L PSD. Horsepower estimates are tough to call accurately in trucks because they tend to be de-rated a bit from their passenger car counterparts, but I'm thinking we'll see at least a 150HP more than the venerable 7.3 Powerstroke. That would put the engine around 425HP and 525TQ. It's very possible that those numbers could be a bit on the low side, but I think that's a fair guess. I highly doubt that Ford will offer a gas engine that makes more HP than the top-of-the-line 6.7L Powerstroke (currently 450HP), but they seem to be dropping a few surprises on me recently. Only time will tell. Keep an on SVTP, we'll let you know as soon as we get more info.


    7.3L_OHV_V8_005.jpg
    FRPP was pretty proud of their Z-Cylinder Heads when introduced. Perhaps some of those lessons will carry over to the new 7.3L V8.
    -SID297
     
  2. Blk04L

    Blk04L SvT Addict Established Member

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    Wow. Really surprised about it being OHV.

    You think they could copy the Hemi/LT1 method of being "fuel efficient" by shutting down cylinders to improve MPG?
     
  3. SID297

    SID297 OWNER/ADMIN Staff Member Administrator

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    I imagine it will be designed with something like that, or the provisions to add it later.
     
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  4. gimmie11s

    gimmie11s Dont be a Hybred Premium Member Established Member

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    Never would I have guessed this.... holy crap.


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  5. SID297

    SID297 OWNER/ADMIN Staff Member Administrator

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    Yeah, me too. I had heard rumors for a while, but figured it was BS.
     
  6. Stateguy

    Stateguy Active Member Established Member

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    Lol Chevy switches to turbo 4cylinders in full size and ford goes back to cam in block.


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  7. Corbic

    Corbic Premium Member Premium Member

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    To long to read for a April Fools joke in May.


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  8. SID297

    SID297 OWNER/ADMIN Staff Member Administrator

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    CtizY5AVYAA6q_m.jpg

    "We'll see.", says the blind man.
     
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  9. DMassey

    DMassey No Habla Jibber Jabber Established Member

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    I'll be honest, I had to check the posting date to make sure it wasn't April Fool's
     
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  10. Great Asp

    Great Asp Well-Known Member Established Member

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    Just thinking of what a power adder would do for that displacement....
     
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  11. SID297

    SID297 OWNER/ADMIN Staff Member Administrator

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  12. ZeroSVT

    ZeroSVT Member Established Member

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    I hate to burst bubbles.... There will not be a 7.3 Pushrod.... 7.0 DOHC maybe ;)
     
  13. HISSMAN

    HISSMAN The Great Bearded One Staff Member Super Moderator

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    I hate to burst your bubble...But it is a pushrod.
     
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  14. StrayBullitt

    StrayBullitt Well-Known Member Established Member

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    Visions of this in a fox body.. :eek:
     
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  15. lOOKnGO

    lOOKnGO Righty Established Member

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    Raptor! WILD! Real V8 sound!!!!


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  16. 04sleeper

    04sleeper Runs On "Liquid Gold" Staff Member Super Moderator

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  17. MG0h3

    MG0h3 Well-Known Member Premium Member Established Member

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    I don’t get it. I could see that as a crate motor from ford performance but in a truck? Remember what a gas guzzling non towing turd the V10 was.


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  18. SID297

    SID297 OWNER/ADMIN Staff Member Administrator

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    The 3V V10 is actually an economical work truck motor that tows well. Here's an article I wrote about it years ago:

    https://www.svtperformance.com/foru...the-ground-than-a-power-stroke-diesel.539114/
     
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  19. MG0h3

    MG0h3 Well-Known Member Premium Member Established Member

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  20. SID297

    SID297 OWNER/ADMIN Staff Member Administrator

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    From the article. VVVVVVVV

    If he barely gets 10MPG empty he either has a lead foot, does most of his driving in town, or has an F-450/550. I've consistently knocked down 13MPG empty in a 2009 F-350 with 4.30 gears.
     
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