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Aevus What really limits our... 07-21-2021, 01:41 PM
Steve M I can't really comment due to... 07-21-2021, 02:10 PM
Aevus Very impressive to get... 07-21-2021, 02:46 PM
Aevus Just a very different... 07-21-2021, 02:50 PM
Aevus Listen to the sound of a high... 07-21-2021, 03:27 PM
Aevus Valvetrain/Oiling/Cooling is... 07-21-2021, 03:21 PM
TKO MOTORSPORTS TEAM They are hydraulic motors 07-21-2021, 03:25 PM
TKO MOTORSPORTS TEAM You cant keep the lifter... 07-21-2021, 07:06 PM
Aevus That's interesting. And... 07-21-2021, 07:56 PM
Old School Slow bleed lifters are... 07-21-2021, 08:09 PM
Aevus https://www.hagerty.com/media/... 07-21-2021, 08:15 PM
TKO MOTORSPORTS TEAM There really is no need to... 07-22-2021, 10:40 AM
Aevus Ain't easy to find... 07-22-2021, 02:37 PM
Aevus https://www.badasscars.com/ind... 07-22-2021, 02:46 PM
Aevus So maybe the solution to... 07-22-2021, 05:22 PM
Aevus From what I understand now,... 07-30-2021, 12:45 PM
Aevus Very interesting article: ... 08-16-2021, 12:18 PM
Aevus https://www.youtube.com/watch?... 07-21-2021, 08:44 PM
SRT_BluByU The main answer to the... 07-24-2021, 01:12 PM
Aevus Had a discussion with Dale... 07-30-2021, 12:35 PM
SRT_BluByU There is always the 9.0L... 08-16-2021, 03:38 PM
usmcfieldmp Can't the Gen 4 heads be made... 08-16-2021, 04:02 PM
Aevus Yes of course. ... 08-16-2021, 04:48 PM
Aevus ... the dyno will tell if ... 08-16-2021, 04:55 PM
TKO MOTORSPORTS TEAM Your on a budget with hard... 08-17-2021, 10:00 AM
Aevus With all the mods i'm doing,... 08-18-2021, 09:45 AM
Aevus I need to point out that I'm... 08-18-2021, 10:03 AM
Aevus FYI Stock Gen 4 Head... 08-18-2021, 11:37 AM
TKO MOTORSPORTS TEAM Factory manifold is where the... 08-18-2021, 06:18 PM
usmcfieldmp I'm curious as to what needs... 08-17-2021, 08:48 AM
J TNT I have a set of Gen 5 heads... 08-17-2021, 08:51 AM
Aevus Very interesting MT article... 10-25-2021, 11:54 AM
Aevus A little update on my... 10-31-2021, 12:09 PM
Aevus New update FYI Finally... 01-27-2022, 11:28 AM
Aevus 49623 Essentially, the... 10-31-2021, 12:16 PM
Aevus Few other things that I've... 10-31-2021, 01:08 PM
TKO MOTORSPORTS TEAM De-stroked , solid with good... 11-01-2021, 10:17 AM
Aevus Yes but we're talking tens of... 11-02-2021, 11:20 AM
TKO MOTORSPORTS TEAM Get where your coming just... 11-02-2021, 01:43 PM
Aevus I don't plan to track the... 11-02-2021, 02:33 PM
TKO MOTORSPORTS TEAM "Work in progress", "... 11-03-2021, 10:01 AM
Aevus 6,600-7,000rpm maximum ...... 11-02-2021, 03:27 PM
Aevus Very interesting article on... 11-03-2021, 10:11 AM
Aevus ... and also, I think... 11-03-2021, 10:20 AM
Aevus Bytheway, with my 2nd (stock)... 11-02-2021, 11:39 AM
Aevus All educated-guesses because... 11-03-2021, 11:30 AM
Aevus Made a list of all the... 11-09-2021, 09:31 AM
SRT_BluByU if 6600-6800 is your goal why... 11-02-2021, 11:21 AM
Aevus did they fix the DBW so it's... 11-02-2021, 11:41 AM
USAFPILOT https://www.youtube.com/watch?... 11-02-2021, 12:56 PM
Aevus Yeah, exactly, that new Z06's... 11-02-2021, 02:48 PM
Aevus Also, I postponed the shaft... 01-27-2022, 11:37 AM
TKO MOTORSPORTS TEAM You will run into block oil... 02-02-2022, 10:01 AM
Aevus Yes, a lot of problems beyond... 02-18-2022, 12:20 PM
Aevus Upgrades I already have... 03-11-2022, 04:34 PM
TKO MOTORSPORTS TEAM If you have a swing pick up... 03-14-2022, 10:47 AM
Aevus Will have to overbalance my... 03-11-2022, 04:29 PM
Aevus Update: Last piece of the... 05-16-2022, 02:34 PM
Dan Cragin That cam is hard to tune with... 05-16-2022, 04:00 PM
Aevus Even with 114 LSA? I've... 05-16-2022, 06:34 PM
LATAMUD I wasn't aiming for 7-8k rpm.... 05-16-2022, 10:38 PM
Aevus damn Latamud, you strike me... 05-16-2022, 11:27 PM
LATAMUD Sure, this one I don't like... 05-16-2022, 11:31 PM
DEMO MAN Well........ street legal is... 05-18-2022, 10:37 AM
Aevus I'm not familiar at all with... 05-18-2022, 11:23 AM
Dan Cragin With a 114 LSA the cam it... 05-18-2022, 02:38 PM
13COBRA What kind of power?? 05-18-2022, 02:54 PM
Aevus In fact, all in all, there is... 05-18-2022, 03:50 PM
Dan Cragin The Drag Pack cars made 800hp... 05-18-2022, 03:03 PM
13COBRA Where might one find one of... 05-18-2022, 03:10 PM
Aevus Unported gen 4 heads with... 05-18-2022, 03:37 PM
Dan Cragin I think Prefix still has some. 05-18-2022, 03:24 PM
13COBRA Emailed, thanks! 05-18-2022, 03:30 PM
Aevus Yeah I wouldnt dare going... 05-18-2022, 03:58 PM
Aevus They couldnt grind exactly... 05-19-2022, 12:56 PM
ILLKING How does the drag pack intake... 05-24-2022, 11:23 AM
Dan Cragin The drag pack intake works... 05-24-2022, 11:27 AM
ILLKING Going with Gen 5 heads on a... 05-24-2022, 11:51 AM
Dan Cragin I'm doing the same thing on a... 05-24-2022, 12:03 PM
SRT_BluByU Doesnt AZ Viper spin his 9L... 05-24-2022, 01:30 PM
Cody\'s Car Conundrum Indeed he does: ... 05-26-2022, 07:19 PM
TKO MOTORSPORTS TEAM ITB is the way to go,... 05-26-2022, 12:08 PM
Aevus A little update on my... 10-01-2022, 10:37 AM
13COBRA I feel like that took a lot... 10-01-2022, 11:54 AM
Aevus That's for sure, no doubt. ... 10-01-2022, 12:10 PM
13COBRA Yeah I hear you. I did heads,... 10-01-2022, 12:52 PM
Aevus peak HP 5,900-6,100rpm? 10-01-2022, 01:11 PM
13COBRA 5225152251 10-01-2022, 02:47 PM
Aevus Yes exactly what I thought. ... 10-01-2022, 07:21 PM
13COBRA What are you wanting to do... 10-01-2022, 09:40 PM
Aevus Street, no track 10-01-2022, 10:14 PM
Dan Cragin Are you tuning the stock JTEC... 10-01-2022, 10:58 PM
Aevus Stock, yes. Hopefully it will... 10-02-2022, 10:53 AM
Aevus I guess the last possible... 10-03-2022, 04:02 PM
Aevus Not properly tune yet, not... 11-30-2022, 08:52 PM
  1. #1

    Lightbulb What really limits our engines to rev higher

    Since I'm rebuilding one of my engines, I was looking for ways to get higher RPM limits in order to get both the typical screaming sound of high rev engines and more horsepower (while keeping it N/A)...

    Basically, the pushrod Viper engine is limited by:

    - Valvetrain stability (it's a pushrod)
    - Long stroke
    - Oiling system (especially gen 1-2-3 and no dry sump for gen 4/5)
    - Air flow (2-valves, heads limitations, etc..)


    The ''theorical'' limit for mean piston speed is 25 m/s or 4900 ft per minute, but that's open for debate since some will say 4000 fpm is the maximum ''safe'' limit while others says a race engine can be pushed as far as 5500-6000 fpm. Many factors to consider here...

    But basically a Viper's 3.96'' stroke would be at the 4900fpm limit around 7,400 rpm, which is already a lot. I've seen destroked Viper on youtube going to 8,000rpm and also few others in the 7,xxx range.

    But other than destroking, what is the path to get that huge engine rev higher? Super lightweight and stable valvetrain is probably mandatory, then you need sufficient air flow (ported heads, high duration camshaft, excellent intake/exhaust systems, etc..) and obviously the oiling and cooling systems that will keep that high rev engine from blowing apart...

    But what else?

    Is super lightweight pistons/rods that important, or it's better to focus on parts strenght?
    Same for push rods, is it better to have heavier oversized but very stiff and stable ones?
    Extemely stiff valve springs? at the cost of losing efficiency


    Some interesting stuff here on the subject:

    https://www.motortrend.com/how-to/11...se-engine-rpm/

    ...but probably some tips do not apply for a 7-8000 rev engine.
    Last edited by Aevus; 07-21-2021 at 01:43 PM.


 

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