[ROVERNET - UK] RE: rovernet Digest, Vol 59, Issue 18

Dirk Burrowes dirk at vy-tek.com
Mon Oct 15 13:07:46 BST 2007


Hi Steve,

I too have installed a Petronix in my 68 TC and with the flamethrower coil.
I did have a low idle problem and ended up setting the idle a little higher.
In speaking to Ruth at ABC she told me that it was most likely gas related
and it would be tough to get a perfect idle around 500 RPMs. I love what the
system has done for the performance and would not trade that. My plugs look
fine but I did do a complete overhaul of my carbs prior to the change. I
have since added the Petronix to my P4 and 3500S all with good luck. In fact
I think the P4 is almost sports car now!!!!

One thing that I did find while rebuilding the carbs was a small intake
manifold leak once that was fixed it made all the difference maybe the carbs
did not need rebuilding but I did this as part of the rebuild. This was
before the Petronix though.

My 2 cents

Dirk

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[ROVERNET-UK]

Today's Topics:

   1.  Mixture problems (Steven Dibdin)
   2. Re:  Mixture problems (Nathan Obuch)
   3. Re:  Mixture problems (Netspace)
   4. Re:  Mixture problems (iudkuy wcygiohs)


----------------------------------------------------------------------

Message: 1
Date: Sun, 14 Oct 2007 10:47:08 -0400
From: "Steven Dibdin" <sdibdin at hotmail.com>
Subject: [ROVERNET - UK] Mixture problems
To: <rovernet at lyris.ccdata.com>
Message-ID: <BAY106-DAV125EC7E2B0CE71763850E9B0A20 at phx.gbl>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
	reply-type=response

Hi Rover Gurus,

I've recently fitted a petronix ignition system to my '68 2000 TC along with
their 'flamethrower' coil (god awful name by the way). Timing is spot on, I
had to replace the old worn out advance weight springs as they were weak
with age. I have checked the advance curve with a strobe light and tacho
against the specs for my engine (10:1 compression) and that is as it should.

My problem is that the fuel mixture seems to be off now. If I set the carbs'

at idle using the workshop manual method of lifting the pins and getting the
idle to rise then fall it runs a little rough at idle, after a few minutes
of running the plugs get sooted up. Suggesting it's too rich at idle. On the
road however, it runs far better than before, better acceleration, more
responsive and a smoother delivery of power.

If I adjust the mixture at idle using my colourtune the idle pretty smooth
but it is running too lean on the road, power's lacking until I pull out the
choke to enrich the mixture.

So my questions are: Has anyone else found a similar problem after changing
over to Petronix? Did they go for different needle profiles to accommodate
the new system? Do I need to find a rolling road to tune with new needles
now?

Anybody out there have any suggestions?

Many thanks,

Steven Dibdin 




------------------------------

Message: 2
Date: Sun, 14 Oct 2007 11:27:52 -0700 (PDT)
From: Nathan Obuch <nathanobuch at yahoo.com>
Subject: Re: [ROVERNET - UK] Mixture problems
To: rovernet at lyris.ccdata.com
Message-ID: <815956.88650.qm at web54605.mail.re2.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1

Steven,
    I don't know that I can claim to be a Rover 'guru'
but off the top of my head, I think you are dealing with an unrelated
issue... i.e. any properly functioning ignition system should not require
any changes in the fuel mixture/carb needles/etc. A particularly strong
spark can sometimes compensate a bit for a lean misfire, but is just masking
the mixture  issue. 

   I would advise checking for any vacuum leaks you might have introduced
during the installation of the Pertronix ignition. Check the float levels in
the carbs. Did the car run OK prior to installation of the Pertronix? 
     Are all the rest of the components in the ignition system up to snuff?
Sometimes a higher voltage output from a 'hot' coil can  break down weak
plug wires/cap/rotor. I would also advise checking the strength of the spark
just to be sure that you are getting a good spark and don't have a defective
new coil. 

Those are my thoughts-- I'm sure some real Rover gurus will weigh in with
their ideas!

Cheers,

Nathan 




--- Steven Dibdin <sdibdin at hotmail.com> wrote:

> Hi Rover Gurus,
> 
> I've recently fitted a petronix ignition system to my '68 2000 TC 
> along with their 'flamethrower' coil (god awful name by the way). 
> Timing is spot on, I had to replace the old worn out advance weight 
> springs as they were weak with age. I have checked the advance curve 
> with a strobe light and tacho against the specs for my engine (10:1 
> compression) and that is as it should.
> 
> My problem is that the fuel mixture seems to be off now. If I set the 
> carbs'
> at idle using the workshop manual method of lifting the pins and 
> getting the idle to rise then fall it runs a little rough at idle, 
> after a few minutes of running the plugs get sooted up. Suggesting 
> it's too rich at idle. On the road however, it runs far better than 
> before, better acceleration, more responsive and a smoother delivery 
> of power.
> 
> If I adjust the mixture at idle using my colourtune the idle pretty 
> smooth but it is running too lean on the road, power's lacking until I 
> pull out the choke to enrich the mixture.
> 
> So my questions are: Has anyone else found a similar problem after 
> changing over to Petronix? Did they go for different needle profiles 
> to accommodate the new system? Do I need to find a rolling road to 
> tune with new needles now?
> 
> Anybody out there have any suggestions?
> 
> Many thanks,
> 
> Steven Dibdin
> 
> 
> _______________________________________________
> rovernet mailing list
> rovernet at lyris.ccdata.com
> To unsubscribe, go to this web page, look near the bottom and follow 
> instructions:
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> 



       
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------------------------------

Message: 3
Date: Mon, 15 Oct 2007 08:42:17 +1100
From: "Netspace" <vmitps at netspace.net.au>
Subject: Re: [ROVERNET - UK] Mixture problems
To: <rovernet at lyris.ccdata.com>
Message-ID: <A1C7F6224CB84F4BADD8E7AF8B2D4E19 at Vista1>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
	reply-type=original

It sounds like a needle (or two) are too low in the dashpot.
When using lift pins, only lift a leettle leettle beet... otherwise you will

set it too rich.
Why is it leaning out?  At this stage I am beat; does pulling the choke out 
work all the time from there on, or only for the first 30 sec?
If it is temporary then sounds like fuel starve, if ongoing then wrong 
needles.
AAA or AAB for HS6 equipped TC.

Usually they suffer from leanness at idle due to butterfly shaft air leaks.

PVS

----- Original Message ----- 
From: "Nathan Obuch" <nathanobuch at yahoo.com>
To: <rovernet at lyris.ccdata.com>
Sent: Monday, October 15, 2007 5:27 AM
Subject: Re: [ROVERNET - UK] Mixture problems


> Steven,
>    I don't know that I can claim to be a Rover 'guru'
> but off the top of my head, I think you are dealing
> with an unrelated issue... i.e. any properly
> functioning ignition system should not require any
> changes in the fuel mixture/carb needles/etc. A
> particularly strong spark can sometimes compensate a
> bit for a lean misfire, but is just masking the
> mixture  issue.
>
>   I would advise checking for any vacuum leaks you
> might have introduced during the installation of the
> Pertronix ignition. Check the float levels in the
> carbs. Did the car run OK prior to installation of the
> Pertronix?
>     Are all the rest of the components in the
> ignition system up to snuff? Sometimes a higher
> voltage output from a 'hot' coil can  break down weak
> plug wires/cap/rotor. I would also advise checking the
> strength of the spark just to be sure that you are
> getting a good spark and don't have a defective new
> coil.
>
> Those are my thoughts-- I'm sure some real Rover gurus
> will weigh in with their ideas!
>
> Cheers,
>
> Nathan
>
>
>
>
> --- Steven Dibdin <sdibdin at hotmail.com> wrote:
>
>> Hi Rover Gurus,
>>
>> I've recently fitted a petronix ignition system to
>> my '68 2000 TC along with
>> their 'flamethrower' coil (god awful name by the
>> way). Timing is spot on, I
>> had to replace the old worn out advance weight
>> springs as they were weak
>> with age. I have checked the advance curve with a
>> strobe light and tacho
>> against the specs for my engine (10:1 compression)
>> and that is as it should.
>>
>> My problem is that the fuel mixture seems to be off
>> now. If I set the carbs'
>> at idle using the workshop manual method of lifting
>> the pins and getting the
>> idle to rise then fall it runs a little rough at
>> idle, after a few minutes
>> of running the plugs get sooted up. Suggesting it's
>> too rich at idle. On the
>> road however, it runs far better than before, better
>> acceleration, more
>> responsive and a smoother delivery of power.
>>
>> If I adjust the mixture at idle using my colourtune
>> the idle pretty smooth
>> but it is running too lean on the road, power's
>> lacking until I pull out the
>> choke to enrich the mixture.
>>
>> So my questions are: Has anyone else found a similar
>> problem after changing
>> over to Petronix? Did they go for different needle
>> profiles to accommodate
>> the new system? Do I need to find a rolling road to
>> tune with new needles
>> now?
>>
>> Anybody out there have any suggestions?
>>
>> Many thanks,
>>
>> Steven Dibdin
>>
>>
>> _______________________________________________
>> rovernet mailing list
>> rovernet at lyris.ccdata.com
>> To unsubscribe, go to this web page, look near the
>> bottom and follow instructions:
>> http://mailman.nipltd.com/mailman/listinfo/rovernet
>> Back-up list and photos at:
>> http://autos.groups.yahoo.com/group/Rover_net/
>>
>
>
>
>
>
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>
> _______________________________________________
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------------------------------

Message: 4
Date: Mon, 15 Oct 2007 01:37:01 -0700 (PDT)
From: iudkuy wcygiohs <iudkuy at yahoo.com>
Subject: Re: [ROVERNET - UK] Mixture problems
To: rovernet at lyris.ccdata.com
Message-ID: <548386.92596.qm at web60112.mail.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1

Steve

I fitted a pertronics system to my 105S and had
misfire problems. It came down to the flamethrower
coil. Fitted a different coil and problem vanished.
Flamethrower maybe should be called "bintosser."

Peter B


--- Steven Dibdin <sdibdin at hotmail.com> wrote:

> Hi Rover Gurus,
> 
> I've recently fitted a petronix ignition system to
> my '68 2000 TC along with 
> their 'flamethrower' coil (god awful name by the
> way). Timing is spot on, I 
> had to replace the old worn out advance weight
> springs as they were weak 
> with age. I have checked the advance curve with a
> strobe light and tacho 
> against the specs for my engine (10:1 compression)
> and that is as it should.
> 
> My problem is that the fuel mixture seems to be off
> now. If I set the carbs' 
> at idle using the workshop manual method of lifting
> the pins and getting the 
> idle to rise then fall it runs a little rough at
> idle, after a few minutes 
> of running the plugs get sooted up. Suggesting it's
> too rich at idle. On the 
> road however, it runs far better than before, better
> acceleration, more 
> responsive and a smoother delivery of power.
> 
> If I adjust the mixture at idle using my colourtune
> the idle pretty smooth 
> but it is running too lean on the road, power's
> lacking until I pull out the 
> choke to enrich the mixture.
> 
> So my questions are: Has anyone else found a similar
> problem after changing 
> over to Petronix? Did they go for different needle
> profiles to accommodate 
> the new system? Do I need to find a rolling road to
> tune with new needles 
> now?
> 
> Anybody out there have any suggestions?
> 
> Many thanks,
> 
> Steven Dibdin 
> 
> 
> _______________________________________________
> rovernet mailing list
> rovernet at lyris.ccdata.com
> To unsubscribe, go to this web page, look near the
> bottom and follow instructions:
> http://mailman.nipltd.com/mailman/listinfo/rovernet
> Back-up list and photos at:
> http://autos.groups.yahoo.com/group/Rover_net/
> 



 
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