[Rovernet] A TC Puzzle for you!

[Steve Manwell]

Hi Jim,

The choke cables do two things; they lower the jets to enrich the 
mixture and they open the throttles a little.  It seems that the 
mechanic would have made adjustments to the carburetors to lower the 
jets and/or open the throttles in the absence of connecting the cables.  
The part I don't understand (as we emailed about previously) is how the 
engine could settle down into a good idle after initially starting at 
high rpm.

It seems like adjusting the idle speed screw to open the throttles would 
cause an increase in engine speed that would not decrease as the engine 
warmed up; if anything it would be expected to run faster and faster.

I wonder if adjusting one of the two jets lower to enrich the mixture 
would be enough to let the car start (how it does so at 3500 rpm I don't 
know, unless the throttles were also adjusted somewhat open).  As the 
car warms up, the mixture should become too rich in that carburetor -- 
maybe two cylinders running too rich "compensates" for too much throttle 
opening after it warms up and causes the engine speed to go down?

You could take the air cleaner off and compare the position of the two 
jets to see if they are the same.  Lift each dashpot piston and look at 
the top of the jet where the needle goes into the center of it.  Also, 
see if you can see (maybe with flashlight and mirror) if the throttles 
are nearly closed.

Sounds like you and Ben may see each other on I-95 on the way to 
Fitchburg...

Steve

On 5/7/2016 10:02 AM, Jim Pile via Rovernet wrote:
> Thanks, Ben.  Good to hear from you. One of these days I'll get over to your area for a visit, but I'm still working and time off comes hard. Next year I retire. Whoopee!!
> 		I've got another fender myself, but the damaged one can be fixed: Just have to get around to it.
>
> 	All the best,
>
> 			Jim
> 	
> On May 7, 2016, at 9:12 AM, Ben Saunders via Rovernet wrote:
>
>> Hi Jim,
>> Do you need another fender? If so I have a few for you to pick from.
>> Ben
>>
>> On 05/07/2016 08:22 AM, Jim Pile via Rovernet wrote:
>>> OK, Roverphiles, I've got an intriguing  puzzle for you:
>>>
>>> A few months back, my '68 2000TC went into a shop to get engine seals replaced, which involved disconnecting the choke cables. When reassembled, the mechanic - who is familiar with English cars - did not re-connect the cables (a chore which I performed later). Instead, to start the car, he made an adjustment somewhere that kick-started the car at around 3500 rpms! Then, as the car warmed up, the rpm's gradually reduced until it was idling gracefully. I have rebalanced the carbs, but that has had no effect. It still starts screaming, then takes about 4 minutes to settle down. What could this mechanic have done to create this most embarrassing way to start an otherwise smoothly running car?
>>> 	I would ask him, except I've distanced myself from him since a fender was significantly damaged while the car was in his care!
>>> I'll be at RoveAmerica with the TC in a month, so I would like to figure out this puzzle before then.
>>>
>>> 	Thanks for your interest.
>>>
>>>
>>> 		Jim Pile
>>> -------------- next part --------------
>>> An HTML attachment was scrubbed...
>>> URL: <http://rovernet.org/pipermail/rovernet_rovernet.org/attachments/20160507/27392557/attachment.html>
>>> _______________________________________________
>>> Rovernet mailing list
>>> Rovernet at rovernet.org
>>> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org
>>>
>>>
>>
>> _______________________________________________
>> Rovernet mailing list
>> Rovernet at rovernet.org
>> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org
>
> _______________________________________________
> Rovernet mailing list
> Rovernet at rovernet.org
> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://rovernet.org/pipermail/rovernet_rovernet.org/attachments/20160507/d61f9ca4/attachment.html>