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  1. #26
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    Quote Originally Posted by Antonio@CalvoMotorsports View Post
    destroke, cut the mains down and go for that 8k
    Antonio, what would be a reasonable budget for this kind of thing? I have absolutely no clue...just curious.
    Want a mod that makes your car faster? Fix the nut behind the wheel!

  2. #27
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    Quote Originally Posted by dewilmoth View Post
    Just read through your thread, impressive... that transmission and dry sump setup are pure automotive porn. Can't wait to hear your thoughts when the car is finished.
    My goal is to be a lot faster than my ACR on the same tracks, but without the all the aero.
    @9literviper 2013 track car, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10

  3. #28
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    Quote Originally Posted by J TNT View Post
    This is not high RPM , but it is High Horsepower .

    https://www.youtube.com/watch?v=JWXbsyYR-8g
    Great vid, thanks for posting!
    @9literviper 2013 track car, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10

  4. #29
    Enthusiast dewilmoth's Avatar
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    Quote Originally Posted by Arizona Vipers View Post
    My goal is to be a lot faster than my ACR on the same tracks, but without the all the aero.
    No doubt. I'm curious why you chose not to do this work to the ACR, being that you're obviously a track guy?

  5. #30
    Good question. But I guess he can always add the ACR-E aero to this monsta down the line if he choses and destroy every track car short of an LMP class racecar.

  6. #31
    Quote Originally Posted by dewilmoth View Post
    No doubt. I'm curious why you chose not to do this work to the ACR, being that you're obviously a track guy?
    Probably because of the drag that the ACR develops. It's always a balancing act hence why the major manufacturer have gone to "active" aero set-ups.

    In short, a car with less downforce can more effectively utilize the additional power.
    You're rapidly becoming the biggest asshat on the forum and that covers a lot of ground. Congrats. -ViperJon

  7. #32
    Enthusiast dewilmoth's Avatar
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    Quote Originally Posted by NT-ACR View Post
    Probably because of the drag that the ACR develops. It's always a balancing act hence why the major manufacturer have gone to "active" aero set-ups.

    In short, a car with less downforce can more effectively utilize the additional power.
    Sure, on a straight line car. I have a hard time believing the same setup on an ACR would be slower around a race track. The drag penalty from the aero seems to be easily made up in the turns. Other manufactures are using active aero on street cars, but real race cars seem to still use tried and true big wings. He said himself he's hoping to be faster around a track than his ACR, after spending what I assume to be a boat load of money, which is why I ask the question. F'n awesome project nonetheless and I love reading this type of stuff.

  8. #33
    Quote Originally Posted by dewilmoth View Post
    Sure, on a straight line car. I have a hard time believing the same setup on an ACR would be slower around a race track. The drag penalty from the aero seems to be easily made up in the turns. Other manufactures are using active aero on street cars, but real race cars seem to still use tried and true big wings. He said himself he's hoping to be faster around a track than his ACR, after spending what I assume to be a boat load of money, which is why I ask the question. F'n awesome project nonetheless and I love reading this type of stuff.
    Many race cars don't have active aero because it's banned in most series.
    You're rapidly becoming the biggest asshat on the forum and that covers a lot of ground. Congrats. -ViperJon

  9. #34
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    Quote Originally Posted by dewilmoth View Post
    I had very good luck with a de-stroked long rod 4G63 Evo motor several years ago. It was an absolute animal of a motor, and the engine characteristics were phenomenal. I would think a similar premise on a Viper engine would be very fun. And it's not like we're talking about giving up much displacement. I'd have to do some math, but I'm guessing de-stroking to 8.0L and pushing the wrist pins as high as possible in the pistons would result in a spinner. But that still doesn't solve the oiling and valve train issues mentioned earlier. Based on the thread above though, it sounds like those issues have already been solved. It's only money!
    Anything 4G63 and/or Evo will be lost on this crowd.
    2009 Viper Red ACR w/stripe delete & black/red interior (1 of 1)
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  10. #35
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    If I recall at the beginning of the GTS-R program they ran smaller bearings from the gen II Hemi in the 8.0L and were making 800 HP at the flywheel in the mid 1990s at somewhere around 7500 rpm. Obviously this was a full blown endurance racing motor with a dry sump but still it was completed over 20 years ago.

    Eventually they could reliably produce 850 HP unrestricted. In race trim with the inlet restrictors in place they were still making 700 and sustaining it for 24 hours.

    Obviously with their record it proved to be a pretty competitive setup on track.
    Last edited by str5010; 01-04-2017 at 06:56 AM.
    -2008 Venom Red ACR Hardcore

  11. #36
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    Quote Originally Posted by str5010 View Post
    If I recall at the beginning of the GTS-R program they ran smaller bearings from the gen II Hemi in the 8.0L and were making 800 HP at the flywheel in the mid 1990s at somewhere around 7500 rpm. Obviously this was a full blown endurance racing motor with a dry sump but still it was completed over 20 years ago.

    Eventually they could reliably produce 850 HP unrestricted. In race trim with the inlet restrictors in place they were still making 700 and sustaining it for 24 hours.

    Obviously with their record it proved to be a pretty competitive setup on track.
    Good memory and a strong platform for it's time .
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  12. #37
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    It would be great to see more people follow the same path incorporating some of the platform updates associated with the gen V package.
    -2008 Venom Red ACR Hardcore

  13. #38
    Quote Originally Posted by SharpMan View Post
    Antonio, what would be a reasonable budget for this kind of thing? I have absolutely no clue...just curious.
    you will be in the short block a lot LOL. Those cranks are 6 grandish alone.
    Fastest and quickest 6 speed Gen V viper/185mph in the half mile stock motor record holder
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  14. #39
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    Youch.

    Can't reduced stroke be done through the con rods?

    Quote Originally Posted by Antonio@CalvoMotorsports View Post
    you will be in the short block a lot LOL. Those cranks are 6 grandish alone.
    Want a mod that makes your car faster? Fix the nut behind the wheel!

  15. #40
    Enthusiast dewilmoth's Avatar
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    Quote Originally Posted by SharpMan View Post
    Youch.

    Can't reduced stroke be done through the con rods?
    That wouldn't reduce stroke, just put the pistons lower in the cylinder.

  16. #41
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    Quote Originally Posted by dewilmoth View Post
    No doubt. I'm curious why you chose not to do this work to the ACR, being that you're obviously a track guy?
    The '13 is more fun for me, and I'm trying to keep the ACR nice. If I hit the wall in the 2013 I can repair it and it wont lose value. I hit a wall in the ACR and it's a $125K mistake. And also because of the warranty. After 5 years I'm sure I'll do heads/cam at least on the ACR. Once the 13 is done, i'll probably only track the ACR at less crowded events. In just a few events the ACR has 5 holes in the windshield, dented splitter etc. It's got a clear wrap so hopefully there's no rock chips in the paint.
    @9literviper 2013 track car, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10

  17. #42
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    Quote Originally Posted by dewilmoth View Post
    Sure, on a straight line car. I have a hard time believing the same setup on an ACR would be slower around a race track. The drag penalty from the aero seems to be easily made up in the turns. Other manufactures are using active aero on street cars, but real race cars seem to still use tried and true big wings. He said himself he's hoping to be faster around a track than his ACR, after spending what I assume to be a boat load of money, which is why I ask the question. F'n awesome project nonetheless and I love reading this type of stuff.
    The '13 was already a little faster than the ACR at the tracks I've done both at, but my '13 had 40 more hp, 50 more ft/lbs and weighs over 300 pounds less. I've since taken almost 150 lbs out of the ACR so I'm sure it's really close now.
    @9literviper 2013 track car, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10

  18. #43
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    Quote Originally Posted by Snakebit10 View Post
    Good question. But I guess he can always add the ACR-E aero to this monsta down the line if he choses and destroy every track car short of an LMP class racecar.
    Yeah this is definitely in the back of my mind, especially when Extreme has the wing and splitter on the market. I'm definitely going to do Shelby's rear diffuser as soon as it's ready.
    @9literviper 2013 track car, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10

  19. #44
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    Quote Originally Posted by Arizona Vipers View Post
    The '13 is more fun for me, and I'm trying to keep the ACR nice. If I hit the wall in the 2013 I can repair it and it wont lose value. I hit a wall in the ACR and it's a $125K mistake. And also because of the warranty. After 5 years I'm sure I'll do heads/cam at least on the ACR. Once the 13 is done, i'll probably only track the ACR at less crowded events. In just a few events the ACR has 5 holes in the windshield, dented splitter etc. It's got a clear wrap so hopefully there's no rock chips in the paint.
    Makes sense. I'd cry if I hurt my ACR.

    Quote Originally Posted by Arizona Vipers View Post
    The '13 was already a little faster than the ACR at the tracks I've done both at, but my '13 had 40 more hp, 50 more ft/lbs and weighs over 300 pounds less. I've since taken almost 150 lbs out of the ACR so I'm sure it's really close now.
    I'm sure the weight makes a huge difference. Mind giving a quick synopsis of how you shaved 150lbs out of the ACR?

  20. #45
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    18" wheels/Hoosiers, passenger seat removal, lightweight battery. Closer to 120 than 150.
    @9literviper 2013 track car, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10

  21. #46
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    Quote Originally Posted by Arizona Vipers View Post
    My goal is to be a lot faster than my ACR on the same tracks, but without the all the aero.
    That's going to be really tough to pull off; the turns are where laps times are made.
    '16 Stryker Purple ACR Extreme
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  22. #47
    Quote Originally Posted by dewilmoth View Post
    With all the Viper future value discussions going on lately, I'm ready to read something more technically interesting on the forum. Wondering if anyone has experience with building a high RPM 8.4L, and what went into it. I admittedly won't be undertaking a build like this anytime soon, but if/when I do modify my Viper, it would likely be a spinner.

    After running some piston speed numbers and comparing them to the LP560-4, it seems as though the Viper engine leaves quite a bit on the table in terms of RPM. The Lambo has a mean piston speed of approximately 26 m/s at max RPM, vs 21 m/s in the Viper. At 7500RPM, a stock stroke Viper would have a mean piston speed of approximately 25 m/s, which seems very doable with good rods, rod bolts, and pistons. Custom pistons allowing longer rods would be ideal. Shortening the stroke with a custom crank could make 8000+ possible, with the added benefit of a very favorable rod/stroke ratio and lots of dwell. Anyway, just thinking out loud and would be interested in hearing thoughts/experiences on the matter. Thanks!
    Anyone did a 7,500-8,000rpm engine on a gen 3/4/5 lately?

    Destroke/custom crankshaft or else

  23. #48
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    Quote Originally Posted by Aevus View Post
    Anyone did a 7,500-8,000rpm engine on a gen 3/4/5 lately?

    Destroke/custom crankshaft or else
    Calvo posted one on facebook recently .....
    White Mamba ,

  24. #49
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    Quote Originally Posted by J TNT View Post
    Calvo posted one on facebook recently .....
    That's his 8.0L destroked car. CRAZY neat.


  25. #50
    Quote Originally Posted by 13COBRA View Post
    That's his 8.0L destroked car. CRAZY neat.

    Amazing, thanks.

    Read the comments and it seems to be destroked to 7.0L
    ... doesnt sound like a Viper anymore though.


 
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