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10-02-2009, 08:42 AM
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CC Member
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Join Date: Jul 2009
Cobra Make, Engine:
Posts: 411
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Not Ranked
Rev Limiters
Not long ago, I over-rev'd my engine. Luckily, no damage, or at least not that I can tell. I see a lot of mention in this site on rev-limiters. I take it a lot of them work in conjunction with a computer igntion system like MSD.
I originally had a dual points system, but have converted to a Pertronix module. Either way, it appears I need a "stand alone" limiter.
I found this one, the Pertronix 600
Seems to me that cutting ignition (even randomly to various cylinders) and then lighting it back up is asking for trouble with an engine loaded at high rpms.
What can I expect to happen when the rev-limiter comes on (other than not revving higher)? Is it sort of smooth, or does it sound like the engine is very unhappy.....like a lot of nasty misfires, etc. |
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10-02-2009, 09:17 AM
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CC Member
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Join Date: Jun 2007
Location: Blitchton Ga,
Ga
Cobra Make, Engine: Superformance aluminum427
Posts: 188
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Not Ranked
You can buy the StreetFire from MSD it uses the same plugins that the Ford box does it has about 3 chips in it just pick the amount of revs you wanna rev to. Go to MSD.com an check it out
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10-02-2009, 10:10 AM
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CC Member
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Join Date: Feb 2006
Location: Thousand Oaks,
CA
Cobra Make, Engine: Classic Roadster
Posts: 1,359
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Not Ranked
Yes, the MSD starts to cut out at the limit. Not really a misfire but more like no fire. Your foot will detect it instantly. The car will just stop pushing at that point.
John
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10-02-2009, 10:11 AM
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CC Member
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Join Date: Dec 2000
Location: Livermore,
CA
Cobra Make, Engine: ERA #629, BBM Side Oiler Block, 482ci, Richmond 5 speed
Posts: 852
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Not Ranked
Quote:
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What can I expect to happen when the rev-limiter comes on (other than not revving higher)? Is it sort of smooth, or does it sound like the engine is very unhappy.....like a lot of nasty misfires, etc.
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With the MSD, it just acts like a very bad miss. You know instantly what you've done and it's time to get off the gas or shift. |
10-02-2009, 10:53 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,913
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Not Ranked
Quote:
Originally Posted by Argess
What can I expect to happen when the rev-limiter comes on (other than not revving higher)?
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You can't miss it, and you instantly raise your foot -- no explosions out the pipes, or anything like that. I looked for the specs on that rev limiter and it says it's adjustable -- that's good. I have an adjustable rev limiter mounted in the back of my glove box. Heaven forbid you should ever allow someone to drive your Cobra you can turn the rev limiter all the way down as far as it will go before you hand over the keys. |
10-02-2009, 11:07 AM
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CC Member
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Join Date: Jul 2009
Cobra Make, Engine:
Posts: 411
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That's one of the things I liked about this Pertronix unit. It's small, so I should be able to wire it in under the dash right to the tach wire from the coil (-) terminal, if that's how it hooks up. Getting to it for adjustment wouldn't be that easy, but it keeps my engine bay from looking too sci-fi.
I didn't want a big MSD-type CI unit in there, so I went to the Pertronix Ignitor in place of points and all looks 60's style once the dist cap is on.
I was concerned because I once melted a piston in a Mercury 70 outboard due to igntion cutting out and then coming back in. Maybe a 2-stroke loads up with fuel during a no-spark condition where a 4-stroke doesn't.
As far as a red-line goes, I'm sure I hit about 6800 rpm once with my 428 caast crank, and that bothered me a bit as I know I could have gone higher yet. Seems to me setting this unit for 6000 rpm would be a good place to start.
I could test it out at say 3000, just to make sure it works. Nice little dials on it for adj.
If anyone actually has one, I would appreciate their view on it.
Thank-you for the replies. All good information to know.
Last edited by Argess; 10-02-2009 at 11:09 AM..
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10-02-2009, 11:08 AM
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CC Member
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Join Date: Apr 2009
Location: Bethesda,
MD
Cobra Make, Engine: CSX 6022, navy blue, period correct 427 SO
Posts: 2,154
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Quote:
Originally Posted by patrickt
I have an adjustable rev limiter mounted in the back of my glove box. Heaven forbid you should ever allow someone to drive your Cobra you can turn the rev limiter all the way down as far as it will go before you hand over the keys.
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That's classic. Sounds like something a lawyer would think of...... 
__________________
“There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.”
www.partskeeper.com
(Less time searching, more time wrenching & driving)
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10-02-2009, 11:10 AM
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CC Member
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Join Date: Apr 2009
Location: Bethesda,
MD
Cobra Make, Engine: CSX 6022, navy blue, period correct 427 SO
Posts: 2,154
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Not Ranked
Quote:
Originally Posted by Argess
That's one of the things I liked about this Pertronix unit. It's small, so I should be able to wire it in under the dash right to the tach wire from the coil (-) terminal, if that's how it hooks up. Getting to it for adjustment wouldn't be that easy, but it keeps my engine bay from looking to sci-fi.
If anyone actually has one, I wold appreciate their view on it.
Thank-you for the replies. All good information to know.
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Let us know how this works out. I might consider this as an option too.
__________________
“There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.”
www.partskeeper.com
(Less time searching, more time wrenching & driving)
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10-02-2009, 01:53 PM
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CC Member
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Join Date: Mar 2007
Location: Creedmoor,
TX
Cobra Make, Engine: FFR3542K, 347 C. I., EFI, T-5, Miata Front Sway Bar, 3 Link, Red with White Stripes
Posts: 1,157
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Not Ranked
Can you use one of these rev. limiters on an EFI motor?
__________________
Steve
Texas Cobra Club-Austin
July 2009 FFCars Picture of the Month
FFR3542K, 347, Holley Sniper EFI, T-5, 4 Wheel Discs, 3-Link, Miata Front Sway Bar, Red with White Stripes
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10-02-2009, 02:04 PM
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CC Member
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Join Date: Apr 2004
Location: Nampa,
ID
Cobra Make, Engine: ERA EXP002, 1968 PI 428 FE
Posts: 691
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Not Ranked
Seagull81 you might check your EFI system as mine (Imagine Injection) has a rev limiter built into the program that you can set on the computer.
Dick
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10-02-2009, 02:04 PM
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CC Member
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Join Date: Aug 2006
Location: San Diego,
CA
Cobra Make, Engine: SPF1715, Roush Built 434 ci Stroker, Dart Block, Ported AFR 205 Heads... 561 hp / 547 tq, Former Roush Show Car, Completed and Prepped By Olthoff Racing.
Posts: 1,066
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Not Ranked
Quote:
Originally Posted by Seagull81
Can you use one of these rev. limiters on an EFI motor?
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Yes........ |
10-02-2009, 02:18 PM
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CC Member
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Join Date: Mar 2007
Location: Creedmoor,
TX
Cobra Make, Engine: FFR3542K, 347 C. I., EFI, T-5, Miata Front Sway Bar, 3 Link, Red with White Stripes
Posts: 1,157
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Not Ranked
Mine is just a stock Mustang computer. I would love to have that over rev. protection. You never know when it might come in handy.
__________________
Steve
Texas Cobra Club-Austin
July 2009 FFCars Picture of the Month
FFR3542K, 347, Holley Sniper EFI, T-5, 4 Wheel Discs, 3-Link, Miata Front Sway Bar, Red with White Stripes
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10-02-2009, 02:21 PM
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CC Member
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Join Date: Aug 2006
Location: San Diego,
CA
Cobra Make, Engine: SPF1715, Roush Built 434 ci Stroker, Dart Block, Ported AFR 205 Heads... 561 hp / 547 tq, Former Roush Show Car, Completed and Prepped By Olthoff Racing.
Posts: 1,066
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Not Ranked
I have had several EFI motors with MSD limiters on them.
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10-02-2009, 02:29 PM
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CC Member
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Join Date: Jan 2009
Location: Las Vegas,
NV
Cobra Make, Engine: Shelby CSX4005LA, Roush 427IR
Posts: 5,463
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Not Ranked
Quote:
Originally Posted by lamaluv
Seagull81 you might check your EFI system as mine (Imagine Injection) has a rev limiter built into the program that you can set on the computer.
Dick
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The Accel DFI system has rev limiter built in. It is programmable with the USB dongle/software. |
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