[Healeys] Four cylinder woes

[Alan Seigrist]

Definitely something to do with the Dizzy if you ask me - weights / springs
/ vacuum advance.

Have you run a timing light on it and see what the advance says ad
different RPMs?  You can mark TDC on the pully with a marker and see what
happens when you run up the revs.  If it advances steadily as you speed up
the motor, then it might be the carbs but I still think it's the dizzy.

On Sun, Aug 11, 2019 at 9:48 AM Peter & Veronica <greylinn at ozemail.com.au>
wrote:

> ....I’d be looking at the needle profiles. A Gunson Colortune is a great
> help as it allows you to see the combustion across the rev  range. I found
> the correct needle for the HD6 on my Shorrock blower (MG TC) that way.
>
>
>
> Cheers
>
>
>
> Peter
>
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
>
>
> *From: *Perry via Healeys <healeys at autox.team.net>
> *Sent: *Sunday, 11 August 2019 11:09 AM
> *To: *i erbs <eyera3000 at gmail.com>; Steven Kingsbury
> <airtightproductions at icloud.com>
> *Cc: *Ahealey help <healeys at autox.team.net>
> *Subject: *Re: [Healeys] Four cylinder woes
>
>
>
> Steven
>
> Our BN2 has “M” mods using a different cam grind then the factory M grind
> (Delta Cams) and 10:1 compression. The stock head compression chamber was
> cleaned up a bit and the ports slightly smoothed. I had to find the right
> carb needles to make the rev range smoother and to provide consistent
> performance. Took a bit of trail and error. Also had to play with the
> static timing but did not have to re curve the distributor. I run a few
> more degrees than stock but that has a lot to due with the cam grind.
> Suspect that if the spark plugs fire at 0 RPM to 2500 and from 3200 up, its
> probably not a plug or distributor problem. The variable is the control of
> fuel and the mentioned potential problem areas (needles, damper springs and
> oil in the pots) have a lot to due with controlling the mixture.
>
> Perry
>
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
>
>
> *From: *i erbs <eyera3000 at gmail.com>
> *Sent: *Saturday, August 10, 2019 8:26 PM
> *To: *Steven Kingsbury <airtightproductions at icloud.com>
> *Cc: *Ahealey help <healeys at autox.team.net>
> *Subject: *Re: [Healeys] Four cylinder woes
>
>
>
> Distributor advance or vaccum leak issues.
>
> Ira Erbs
> Portland, OR
> typos and artifacts are the fault of my phone
>
>
>
> On Sat, Aug 10, 2019, 2:04 PM Steven Kingsbury via Healeys <
> healeys at autox.team.net> wrote:
>
> To start off, my car, an early BN1, #598 was burned up in the Paradise
> fire and I just bought another BN1 to replace it. The new car has been hot
> rodded up a bit. Cam, bigger carbs and different pistons so it has a way
> different compression ratio and has been in this configuration for over ten
> years I believe. Was told it runs like the wind and came from a reliable
> and trust worthy person. Well I'm having problems with the car. Up to 2500
> RPM, it runs great! When I can get it up to 3200 RPM it runs great again,
> it's the 2500 to 3200 range where I'm having problems.
>
>    It feels like it's starving for fuel, or it has too much fuel, it
> hesitates, feels like it's not running on all cylinders, and generally like
> a bucking bronco, but then at 3200 or so, she smooths right out and flies!
>
>    I was told the carbs were set up a little rich. I leaned them out one
> flat at a time and no difference until they got too lean and wouldn't run
> well at all. So I took them back to original setting positions.
>
>    I've checked all gaps, they're all right. Pulled plugs when getting
> home and they are all fine, a little brown and all even looking. New
> condenser, new coil, changed to new plugs, I have not checked the timing
> yet, but with the way it runs below 2500 and above 3000, it seems to be
> just fine.
>
>    I am getting the car up in the air Monday as I have new tires to
> replace the old ones and will do a static timing check at that time. My old
> four cylinder was a breeze to set up and ran smooth through all revs. What
> am I missing with an engine set up like an M? Why would things go south
> between 2500 and 3000 and run fine below and above?
>
>    All suggestions are welcome and I do have a new fuel pump on order, so
> fire away. I've been doing things one step at a time to not introduce new
> problems, but this is the only problem that is consistent.
>
>    Thanks,
>
> Steven Kingsbury
>
>
>
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