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Shudders when enginebraking 
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Location: Uden (Holland)
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Post Re: Shudders when enginebraking
@Malcolm: Because of Rosberg's action Max didn't finish in place 3 but 2... does that balance the scale a bit? :wink:


Mon Jul 04, 2016 9:37 am
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Post Re: Shudders when enginebraking
Yoda74 wrote:
Haha, rather the revcounter than a rat or bird :wink:
It's hard to say if the counted revs are the actual revs.

Easy solution, press harder and get more revs.
I found and rebuilt an abandoned Panhard here in Kano just under 20 years ago and when found it had its own ecology, with rats eating the wiring inside the dash, a bird nest with 2 eggs in the petrol filler pipe, and a writhing mass of beetles that had eaten the carpets and then were being eaten by lizards, who then had a Nik nak that was eaten by the beetles, the Nik nak/beetles were about 50mm deep when I opened the door and you could not enter because of very strong ammonia fumes. Oh and a tree had grown where the engine was supposed to be and had to be cut down to move the car. That was a job and half to get complete and running again, but I have had to make and adapt far more for my GTM so it is taking longer, already 3 years now.
John


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Mon Jul 04, 2016 10:12 am
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Post Re: Shudders when enginebraking
It looked much better when completed :D
John


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Mon Jul 04, 2016 10:14 am
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Post Re: Shudders when enginebraking
Nice Job John, looks very well after the rebuild!

Did you hatch the eggs and did you give all beasts a new place to stay? :wink:


Mon Jul 04, 2016 10:25 am
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Post Re: Shudders when enginebraking
It was and interesting and quite unusual car and fun to drive, you had to keep reminding yourself it was only an 850cc engine.
The wildlife got evicted they had no business in there anyway :wink:
John


Mon Jul 04, 2016 10:34 am
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Post Re: Shudders when enginebraking
Nice looking cars those Panhards.
Very uncommon, can't remember seeing one in real life.


Mon Jul 04, 2016 1:58 pm
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Post Re: Shudders when enginebraking
It was the only one I ever saw in Nigeria, they were never imported, it is still around in Kano but is now black. very attractive shape and well ahead of its time, mine was made in the last 2 years of production 65 to 67 and had very big disc brakes on all 4 wheels, 2 calipers on each front hub, it stopped :lol: the engine was an air cooled short stroke boxer twin that made 60bhp out of 850cc more like a bike engine than a car, I was always looking for the doubled up engine they made to put into an armored car for the military, just curious to see if it could fit, they also made an air cooled flat 12 to go in a tank, but think that would be too long to fit :roll:
John


Mon Jul 04, 2016 2:18 pm
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Post Re: Shudders when enginebraking
Maybe if it is a 50cc for a miniature Tank :lol:
I like Boxer engines, my "larger" car is a Subaru Outback with 2,5ltr flat four.
In the past I drove an Impreza GT Turbo, 2.0 Turbo Boxer, that would have been a nice engine for the Panhard :D
With those stoppers it needed a bigger engine :wink:


Tue Jul 05, 2016 1:31 pm
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Post Re: Shudders when enginebraking
Can anyone tell me what diameter the signal-cables to the revcounter should be? (from ignition and coil to counter)

Cheers
Harold


Mon Jul 11, 2016 10:47 am
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Post Re: Shudders when enginebraking
Hi Harold,
The same size as all the other low load wiring, I would guess 1mm :wink: it only has to carry the ignition pulse through the rev counter.
Super Max kept Mr Rosberg very honest on Sunday, a well deserved 3rd place converted to an inherited 2nd place :lol:
John


Mon Jul 11, 2016 11:03 am
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Post Re: Shudders when enginebraking
Hi John,

Allright, I measured the other dash-threads diameter at about one 1mm.
The threads I used are 2,5mm2 and might cause the low amount of revs it shows, sais the supplier.
They are thicker than the coily white piece of thread you connect it to on the back of the counter.
It should be less or even. Also these two wires should not be near high current ones like ignition cables.
I will try to avoid these, it is near the negative batterycable, maybe I should keep them further apart too.
Yesterday I drove the mighty machine and it stutters when pushing the pedal and try to rev a bit more.
At low revs it seems better.
So at first I disconnected the impuls wires at the coil and ignition and connected these two Like it was before I connected the Smiths counter to see if it would run better.
That didn't help.
Then I disconnected the switched +, the light + and the - of the counter.
That did help, it ran beautifully, but no revcounter...
I asked the supplier for some tips, I will test these later.
Maybe bad ground?

Max did well again, good qualification and race.
If Rosberg wouldnt have heard what to do from the pit he probably wouldnt have finished. 10 seconds penalty seems fair or maybe even too low.
On intermediates Max was fast, declassed Rosberg :D
Next race in Hungary will be nice I hope.


Mon Jul 11, 2016 5:43 pm
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Post Re: Shudders when enginebraking
Hi Harold,
Your Dutch to English translation is getting a little confused here and I can't help with Dutch :wink: are we talking about wire size, or thread size (screw thread) as I remember from very long ago using a Smiths electronic rev counter in my old Cox, there was a live feed wire from the ignition switch supplying power to the coil, this wire looped through a plastic pickup block held by a single nut on the back of the rev counter, this looped wire gave a pulse to the rev counter every time the contact breaker in the distributor opened, the rev counter counted the pulses and gave a reading. the wire size should not be critical except if it were too big it my not easily pass through the pickup block on the back of the rev counter.
The only electrical supply into the rev counter would be the supply to the bulb that lights up when you switch on the car lights, the pulse wire does not have a live connection to the rev counter, maybe a picture of the back of your rev counter would help here?
Cheers
john


Tue Jul 12, 2016 7:26 am
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Post Re: Shudders when enginebraking
Hi John,
Sorry for my wrongish translation, in Dutch Wire = draad, but also (schroef)draad = (screw)thread.
Sometimes it's hard to get the right words to mind. :D

The looped wire is what I meant with "coily white piece of thread"

Here pic of mine (Black=grounded, Red = light+ and Yellow = switched +)
Image

And a pic of how to connect it
Image


Tue Jul 12, 2016 10:13 am
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Post Re: Shudders when enginebraking
I can't complain, your English is soooo much better than my Dutch :oops: and not surprised you get mixed up with your "draad and schroef" I would too :lol: It was as I remembered from my old Cox the pulse wire coiled through a little plastic contact block, try using a separate supply from the ignition switch to the rev counter and also a separate earth.
Cheers
John


Tue Jul 12, 2016 11:21 am
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Post Re: Shudders when enginebraking
I think I might have solved the tacho-problems, but it's to wet outside to testdrive.
The switched + seems not really switched but straight from the coil.
So I took it off and took a truly switched +, which I also used for my reverselight, and tried that on my tacho.
It started better than last weekend and also I see more counted revs. :mrgreen: :mrgreen:
My supplier already mentioned that if it was wired straight from the coil, that would explain the trouble.
Someday soon, when it is dry, I will give it a spin and see how it goes.
I wonder if I have to replace the pulsewires with thinner ones anyway.
First see if it runs okay now.

Harold


Tue Jul 12, 2016 7:38 pm
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