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| iCorvette | what is meant by over revving an engine? | ||
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Senior Guru
 
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i am not talking about sustained high rpm's just drag race type shifting.
if the engine goes to that rpm (high), and does not limit itself, like a tpi car is know for wheezing at 4800 rpms, what harm? then aside from the weakest part, i do have some parts like the 2 bolt mains, the edlebrock roller timing chain and the vibraton damper in there stating those parts should not exceed 6000 rpm. should i excercise caution with these or is it a non issue? is there a safety cushion when they sell this stuff, since my stock tach is literally garbage, i have triggered the rev limiter set at 6500 once, and didn't know what it( sudden bogging)was until yesterday that the tach was too slow. what would be my super ram optimal shift points? any enlightenment on this would be great and thanks... |
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Posted on: 2009/9/21 2:20
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| bogus | Re: what is meant by over revving an engine? | ||
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Grand Imperial Pooh-Bah
 
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over revving is usually going to damage valves first. What happens is that the valve train is moving so fast that the valve can't close. It's called "valve float" and it's potentially bad.
Next up is the piston hitting the partually opened valve... see where this is going? I would put in a better tach and make sure your rev limiter is accurate. |
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Posted on: 2009/9/21 3:15
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| vetteoz | Re: what is meant by over revving an engine? | ||
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Quote:
This test on a SR equiped 383 ( with bigger cam than yours ) shows it losing power badly past 5500 so there is little point reving higher because you will be slowing down. You will also note in the comparison ; only the HSR and MR show power gains through 6000. http://www.compcams.com/Community/Art ... Details.asp?ID=1737510521 |
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Posted on: 2009/9/21 5:07
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| iCorvette | Re: what is meant by over revving an engine? | ||
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Quote:
thanks, just what i needed |
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Posted on: 2009/9/21 8:24
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| iCorvette | Re: what is meant by over revving an engine? | ||
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since the party is over at around 5500 rpm, is it wise to set the limiter at 6000? or there about? and not go to 6500 (stock)
thanks |
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Posted on: 2009/9/21 8:31
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| sliding | Re: what is meant by over revving an engine? | ||
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Quote:
Into my topic  |
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Posted on: 2009/9/21 9:40
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| dan0617 | Re: what is meant by over revving an engine? | ||
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Yes. I revved a stock 350 bottom end to 6200 rpm shift points for a season with no problems, but that was with an HSR intake and other supporting mods so that was about the optimal shift point for me. For you, I'm guessing 5500 to 5800 shift points, I'd set the rev limiter around 6000 or 6200. |
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Posted on: 2009/9/21 12:20
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ยด89 Vert, 383, 230/236 cam, AFR 195's, LT Headers, HSR intake, 2800 stall, Zex 200 shot, ET Street Radials, tune by me. Runs were with D36 3.07's. On spray, 10.55 @ 132.78, 1.55 60 ft. On motor, 12.08 @ 113.15, 1.66 60 ft. |
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| vetteoz | Re: what is meant by over revving an engine? | ||
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iCorvette wrote: As you have a manual and there is the possibility of a missed shift , I would go for the lower setting. See sliding's posts on possible damage. |
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Posted on: 2009/9/21 14:18
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| BrianCunningham | Re: what is meant by over revving an engine? | ||
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overrev and LT1 and you'll spin the rod bearings.
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Posted on: 2009/9/21 14:42
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Polo Green 95 LT1 6-spd http://mysite.verizon.net/vzevcp74/ 383 LT1/Vortech Supercharger/AFR heads/Rod end suspension/Penske-Hardbar dual rate coilovers/Wilwood 6pot brakes NCCC Governor: http://BayStateCorvetteClub.com |
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| Alcee1 | Re: what is meant by over revving an engine? | ||
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Guru Emeritus
 
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What is meant by over revving????? when you've blown your motor, you over rev'd
 couldn't resist. |
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Posted on: 2009/9/21 15:53
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Edlebrock Heads, 2030 cam, X-ram w/EGR, 1.6 R/R, Bored TB´s, AFPR, Pro-built Tranny, Vigilantly 2600, Transgo, Dana 44 3.54, Hardened Pushrods & Head Bolts, Custom performance chip, K&N, Double roller timing chain, Aluminum radiator & flex hose, MS |
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| iCorvette | Re: what is meant by over revving an engine? | ||
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Quote:
the ultimate limiter, self destruction back to 0 rpm permanently...  |
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Posted on: 2009/9/21 16:55
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| iCorvette | Re: what is meant by over revving an engine? | ||
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Quote:
why an lt1 and not an l98? for rod bearings that is... |
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Posted on: 2009/9/21 16:56
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| iCorvette | Re: what is meant by over revving an engine? | ||
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Quote:
we'll i to have the arf heads with the 8mm valve stems and 8019 heavy duty springs still newish( 2800 miles), (i know my XFI cam has some steep ramps) and crane gold roller rockers 1.6, if i had a HSR , I know i don't have them, but suppose it did wouldn't these parts could support the higher rpm's correct?. but suppose i switched to a mini ram for discussion... would the timing chain break? and the damper grenade? if not then an occasional miss shift may not be the " kiss of death": am i wrong here? i know this is moot as the power band is lower which is fine i like and need the mid and low end torque. setting the 6000 limit now thanks gents.... |
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Posted on: 2009/9/21 17:08
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| BeachBum | Re: what is meant by over revving an engine? | ||
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Assuming you are running the set-up in your signature.... I raced a very similar set-up for many years, albeit with a different cam..... made its HP peak at 5700 rpm on the chassis dyno, and I shifted typically in the 6000-6200 rpm area..... I tried running it higher, it didn't go any faster, I did short shift it, and it would slow down a little. I would think a 6500 rpm rev limiter and shift at around 6000 rpm and then experiment.
Good Luck ! Quote:
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Posted on: 2009/9/22 1:45
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| bogus | Re: what is meant by over revving an engine? | ||
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Grand Imperial Pooh-Bah
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Quote:
Actually, I was under the impression it was wrist pins... there seems to be a belief that they are weak. I haven't seen enough empirical data to back it up, considering the rotating masses are nearly identical. |
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Posted on: 2009/9/22 2:48
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| bogus | Re: what is meant by over revving an engine? | ||
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Grand Imperial Pooh-Bah
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Quote:
Check. |
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Posted on: 2009/9/22 2:49
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| PeteK | Re: what is meant by over revving an engine? | ||
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Moderator
 
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Quote:
I have seen the wrist pins get yanked through a cast piston in a high rmp motor making decent power. |
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Posted on: 2009/9/22 14:28
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