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Old 14 Aug 2013, 18:34 (Ref:3289821)   #1
FastDB2s
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FastDB2s should be qualifying in the top 10 on the grid
rev limiter legality

Are rev limiters legal in historic racing
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Old 14 Aug 2013, 19:17 (Ref:3289841)   #2
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terence should be qualifying in the top 10 on the gridterence should be qualifying in the top 10 on the grid
Ran one on my B for years,scrutineers were always aware of what it was,no problems.
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Old 14 Aug 2013, 19:21 (Ref:3289844)   #3
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I've not heard of a car failing legality checks for having one. Some organisers have different rules on acceptance of electronic ignition, but can't remember ever seeing any mention of electronic rev limiters......
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Old 14 Aug 2013, 19:42 (Ref:3289854)   #4
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FastDB2s should be qualifying in the top 10 on the grid
Thanks Mike, didn't think there were any rules on them but you have to ask
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Old 14 Aug 2013, 22:32 (Ref:3289917)   #5
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Well, I'd rather see our cars survive to fight another day than get over revved and blow up and be out for the rest of the season!
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Old 15 Aug 2013, 07:45 (Ref:3290041)   #6
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Rudernst should be qualifying in the top 3 on the gridRudernst should be qualifying in the top 3 on the gridRudernst should be qualifying in the top 3 on the gridRudernst should be qualifying in the top 3 on the grid
I completely disagree !!

You need to look into Appendix K.
In there it clearly says that rev limiters are only legal if they work to the same principle as in period and which means not at all. That rules out reliable rev limiters in many forms of historic racing.

I think that this is a stupid and arcane rule that just puts engines at risk.
fundamental traditionalists at work again
nobody tries to go quicker by hitting the limiter on the upshift
yes, you might gain a Little at a start when you dont have look at your rev Counter with an eagle eye and have more overview of the General Situation but, so what

what is happening in the real world is that this rule is not policed and you will very likely not be bothered if you fit one.

buuuuuuut, most limiters are more trouble than they are worth, I stopped bothering with them years ago, many older ignitions dont really like them
On the other Hand, they are mandatory in HFO and work fine with the DFV spark box

Rudolf
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Old 15 Aug 2013, 08:45 (Ref:3290070)   #7
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In there it clearly says that rev limiters are only legal if they work to the same principle as in period and which means not at all.
Lotus Twincams had a mechanical rev limiter in period, built into the rotor arm. I believe other cars, e.g. Rover P6, VW, may have used a similar device.
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Old 15 Aug 2013, 10:26 (Ref:3290107)   #8
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simon drabble should be qualifying in the top 3 on the gridsimon drabble should be qualifying in the top 3 on the gridsimon drabble should be qualifying in the top 3 on the grid
I agree with Rudolf, whenever I have had one fitted it has ended up causing problems. It won't protect you on a dodgy downshift and on the way up you should have some concept as to when to change!
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Old 15 Aug 2013, 10:58 (Ref:3290117)   #9
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I have to say that I am very confused by a couple of posts here! Are you supporting the use of RELIABLE limiters or not? All I was saying is that I would prefer our FISCAR cars not to be over revved to ensure their survival from one race to the next by whatever means works.

(Rudolf - emailed you about the FLIERS ages ago and Combe on 6th October!)
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Old 15 Aug 2013, 11:02 (Ref:3290120)   #10
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simon drabble should be qualifying in the top 3 on the gridsimon drabble should be qualifying in the top 3 on the gridsimon drabble should be qualifying in the top 3 on the grid
I dont have a problem with people using them - just I think they can cause more problems than they solve.
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Old 15 Aug 2013, 11:05 (Ref:3290125)   #11
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Lotus Twincams had a mechanical rev limiter in period, built into the rotor arm. I believe other cars, e.g. Rover P6, VW, may have used a similar device.
It used the increase in centrifugal force as revs increased to break the HT connection, IIRC!

Rudolf is correct of course- there is a specific mention in AppK for Period E, F and G1 Series Production Touring and Standard Grand Touring Cars- "The addition of an electronic ignition system is not permitted, nor is that of an electronic rev limiter."

However, for same period Competition Touring and Competition Grand Touring Cars there is no mention...

Plus for "Non Homologated Cars" the technical regs state "An electronic rev limiter may be used for period F onwards.

If you want to fit one, in the real world common sense would appear to prevail.

Apart from possible reliabilty issues, as Simon says, a rev limiter doesnt help if you select 2nd gear rather than 4th.
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Old 15 Aug 2013, 11:56 (Ref:3290152)   #12
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terence should be qualifying in the top 10 on the gridterence should be qualifying in the top 10 on the grid
Thing is,that if you share the car regularly,and not overly sure on a drivers capability of observing the rev limit you instruct him to use,surely it makes sense?
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Old 15 Aug 2013, 12:02 (Ref:3290157)   #13
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simon drabble should be qualifying in the top 3 on the gridsimon drabble should be qualifying in the top 3 on the gridsimon drabble should be qualifying in the top 3 on the grid
a fair point but I would think the bigger risk is a bad downchange and rev limiter is not going to protect you from that! In a two driver race I would hope both drivers would be sufficiently sympathetic to not red line the car - however...
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Old 15 Aug 2013, 12:27 (Ref:3290169)   #14
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It used the increase in centrifugal force as revs increased to break the HT connection, IIRC!
That's the way it worked. Apparently, 1960s manufacturing technology being the way it was, there could 200-300 rev/min variation in cut-off revs between units.
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Old 15 Aug 2013, 18:16 (Ref:3290295)   #15
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I've got one of those rev limiter rotor arms amongst my collection of "clutter" on an old TC distributor.
I seem to remember they were a std fitment on new road going Mk 1 twink Cortinas, but most were soon replaced as they caused missfiring problems.
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