TR6 Hesitation, while turning, I'm stumped.

[BwanaJoe]

Late to the discussion, but you can also do a test by pulling the choke cable slightly, enough for the first inlet on the starter box to bleed in fuel. If the problem stops, you are starving for fuel. I am experiencing a fuel starving problem right now, however I have three ZS carbs and I think the mechanical fuel pump, (original type) is not keeping up with the amount needed. I get stuttering through all gears and looking at the plugs, they're looking very lean burn. I also installed a glass fuel filter inline just in front of the carbs, and it always looks empty, or very little fuel in it. So, I'm looking for advice on a better fuel pump.

I'll give that a try. As for the filter, I didn't they they were ever full of fuel.

 

[BwanaJoe]

Well, the whole problem was only partially fixed. So to sum up:

Turns out, when testing, we noticed a hestiation/light surging in 2nd and 3rd gear between 2500 and 3000 RPM when holding steady throttle as well as the original problem. Also, it had an occasional hesitation starting out very slowly from a dead stop. The left turn sweeper hestitation was only rearing its ugly head when moving (not from a dead stop) and in 2nd gear trying to accerlerate using around 2200-2500 RPM. New cap, new rotor, new Petronix coil (an old under the cap ignitor), no issues with any of the leads could be found. No crimped fuel lines (most are new), new tank, new vent lines, new fuel pump, new filter.

The hesitation problem was cured by raising the needles to ensure better fuel delivery and going to 10W40 in the dash pots. The turn issue is still there. The garage thinks its the Crane cam the previous owner put in coupled with the original ZS carbs. I'm dubious.

 

[Hamish Racing]

Thanks for the update / results.

It could be the cam bogging down ( as we say in uk) at those rev if its a somewhat performance cam.

 

[NutmegCT]

Back to basics ... In your first post, I see:

I have a 72 TR6 that I've recently had the carburetors rebuilt, fuel pump replaced, the gas tank replaced, and the metal fuel lines all replaced.

Did the problems exist *before* you had all the work done?

Tom M.

 

[sp53]

i would put the original ignition back, and see what happens

 

[BwanaJoe]

Yes.

Back to basics ... In your first post, I see:



Did the problems exist *before* you had all the work done?

Tom M.

 

[Alfred E. Neuman]

Late to the discussion, but you can also do a test by pulling the choke cable slightly, enough for the first inlet on the starter box to bleed in fuel. If the problem stops, you are starving for fuel. I am experiencing a fuel starving problem right now, however I have three ZS carbs and I think the mechanical fuel pump, (original type) is not keeping up with the amount needed. I get stuttering through all gears and looking at the plugs, they're looking very lean burn. I also installed a glass fuel filter inline just in front of the carbs, and it always looks empty, or very little fuel in it. So, I'm looking for advice on a better fuel pump.

The original mechanical pump shouldn't have any trouble keeping up enough flow to three carbs unless it's failling and needs to be rebuilt or replaced. If carbs were outpacing fuel supply from a pump in good working order, you'd be measuring gallons per mile instead of miles per gallon.
I do think going to an electric is a good idea if originality isn't a issue. No risk of a diaphragm splitting and dumping fuel into your sump if there nothing there but a blanking plate.

 

[BwanaJoe]

I'll dig out the old points and give it a try on Monday.

i would put the original ignition back, and see what happens