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Crazy rev counter
Posted: Mon Aug 29, 2011 8:53 am
by Vegard
I've fitted an Elliot rev counter on my racecar. However, lately at top rpm, the needle has started to bounce. It exceeds 8000 at times, and I know that the engine doesn't. On my last race this weekend, the engine started to midfire at top in fourth as well. I guess this could be related.I'm running Lumenition breaker-less ignition.
Any ideas on what's causing this?
Re: Crazy rev counter
Posted: Mon Aug 29, 2011 1:53 pm
by JC T ONE
Vegard wrote:
I'm running Lumenition breaker-less ignition.
I belive this is the setup with an "eye" inside the distributor ?
If it is, then check the little copperwire, on the bottom plate (from outer housing, to ground plate) this can sometime brake off.
Re: Crazy rev counter
Posted: Wed Aug 31, 2011 7:35 pm
by big-un1967
I may have the answer?
My FIA race car had the same problem, and my friends Elva fitted with a BMC FJ set-up.
It seems that if you run a Elliot taco and LUCAS SPORTS (gold) coil, they are not compatible.
You need to fit a diode on the coil, to smooth the signal out. This is the recommendation from Elliot, and it has worked for us both.
I don't have the car in front of me, but when I next look i will feedback what rating it is?
Regards
Paul.........
Re: Crazy rev counter
Posted: Wed Aug 31, 2011 9:54 pm
by Tim Harber
Elliott stopped making rev counters a year and a half ago , so don't expect any help from that end.
I've got one on my 7 port thing and its's fine with a cheap coil. Never felt the need for a sports coil especially as they're a bit blingy for me
Re: Crazy rev counter
Posted: Wed Aug 31, 2011 10:04 pm
by Vegard
As a matter of fact, this started when I changed to a gold coil. Seriously
Could the misfire come from this as well?
Re: Crazy rev counter
Posted: Wed Aug 31, 2011 11:06 pm
by JC T ONE
Vegard wrote:As a matter of fact, this started when I changed to a gold coil. Seriously
Could the misfire come from this as well?
Only one way to find out
Re: Crazy rev counter
Posted: Thu Sep 01, 2011 6:27 am
by Jack of all trades
When we were racing in the '90s we had loads of problems with the Lucas sports (gold) coil, we swapped to the old SA12 with the brown top
http://www.google.com/imgres?q=lucas+sp ... 9,r:4,s:68 and all the problems were solved. It never failed in 3 seizons.
Re: Crazy rev counter
Posted: Thu Sep 01, 2011 11:42 am
by sandman
Lucas coils are known to cause problems... I would swap back and try.
I always carry a spare - which come to think of it - you now got Vegard (hehehe)
Re: Crazy rev counter
Posted: Thu Sep 01, 2011 11:46 am
by Vegard
sandman wrote:Lucas coils are known to cause problems... I would swap back and try.
I always carry a spare - which come to think of it - you now got Vegard (hehehe)
Indeed, and see where it got me...A lost race
