[Healeys] Four cylinder woes

[Perry]

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 for Windows 10

From: i erbs
Sent: Saturday, August 10, 2019 8:26 PM
To: Steven Kingsbury
Cc: Ahealey help
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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