[TPR] Asa's 3310-2 carb rebuild

[Asa Jay Laughton]

JB,
I agree vacuum gauges don't lie.  But if I'm not tuned optimally, it 
could be reading low. I do think I got all the other leaks though I can 
test again with some carb cleaner.

At even numbers, Holley recommends rounding down, in other words:
10" vacuum / 2 = 5 (round down to 4.5 valve)
11" vacuum / 2 = 5.5 valve
12" vacuum / 2 = 6 (round down to 5.5 valve)

Too bad they aren't screw-adjustable. :)
They are anywhere from $7 each to $10 each depending on manufacturer.  I 
guess I could get the 4.5 valves and once it's all together, on the car 
and tuned, if we find the vacuum is higher, I can swap higher ones in.  
(it's only money)

Asa  Jay

Asa Jay Laughton - W7TSC, MSgt, USAFR, Retired
&  Shelley Marie
Spokane, WA
******************************
http://www.racingagainstautism.com
http://www.teampanteraracing.com
http://facebook.com/racingagainstautism


On 7/26/2015 9:16 PM, John via TPR wrote:
> Asa,
> Vacuum gauges don't lie. :). Plug any vacuum leaks and test with some carb cleaner. Make sure no leaks. Warm up the engine and measure the vacuum at idle. Divide the inches of manifold vacuum by 2 and start with that valve (or within 0.5 if you have it). That will get you close
>
> JB
>
> Sent from my iPad
>
>> On Jul 26, 2015, at 8:53 PM, Asa Jay Laughton via TPR<tpr at teampanteraracing.com>  wrote:
>>
>> Alright,
>> Warmed up the Pantera in the garage to get a vacuum reading.  I'm getting ready to order all my parts and need to know what size power valves to get.
>>
>> Stock are 6.5
>> My vacuum reads 10, which means I should get 4.5 power valves, but that seems too low to me.  I think the reading of 10 isn't right.  I had thought when properly tuned, I get more like 11 to 13.  This is -not- a radical rebuild and I wouldn't expect the vacuum to be that low, thought it does seem to idle there, albeit a bit rough.
>>
>> I also found a vacuum leak which is probably contributing to my troubles and might explain a few other things.  Once I plugged that, I read 10.  I think I might be more comfortable buying 5.5 power valves.
>>
>> Opinions from the knowledge brains?
>> Asa  Jay
>>
>> Asa Jay Laughton - W7TSC, MSgt, USAFR, Retired
>> &   Shelley Marie
>> Spokane, WA
>> ******************************
>> http://www.racingagainstautism.com
>> http://www.teampanteraracing.com
>> http://facebook.com/racingagainstautism
>>
>>
>>> On 7/26/2015 6:21 PM, Asa Jay Laughton via TPR wrote:
>>> Alright gang, here we go.  This will of course take a few days due to other things that will invariably get in the way, like the fact a one gallon can of carb clean will -not- fit a Holley throttle body or base plate through the opening in the top.  So, as I did some 20 years ago, I'll buy the five gallon container, it works a whole lot better.
>>>
>>> Today, I completely disassembled the carb.  I'll have more details and photos posted to the TPR site later.  For now, I found it has #72 jets in the primary circuit and #76 in the secondary.  Both power valves are #65 (meaning they cut in at about 6.5" of vacuum).  The throttle plate appears to -not- have the check valves for preventing power valve blow-out.  I found info on that mod and will see if this base plate can take that mod.
>>>
>>> The gaskets were definitely dry, it took a bit of patience to separate all the pieces but I did manage.  I checked and most all the parts I need to do the rebuild are not to be found locally so I'll be placing an order with Summit shortly.
>>>
>>> Are we having fun yet?  :)
>>> Asa  Jay
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