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tr4 engine tuning

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#1 Willie

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Posted 17 May 2018 - 03:35 PM

Hi Folks,

                Another question which I can't get my head around.  My car as a late TR4 [July 1964] is displaying strange combustion.  Twin CD175 Strombergs are fitted. Numbers 1 & 4 spark plugs look as if the mixture is leanish, whereas numbers 2 & 3 look as if the mixture is too rich! How can the front carb create lead cylinder lean and trailing [#2] cylinder rich, and the rear carb create lead [#3 cylinder] rich and trailing [#4] cylinder lean? To my amateurish eye, it just doesn't make sense!

 

Best wishes   Willie


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#2 Willie

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Posted 17 May 2018 - 03:37 PM

Sorry folks, I thought the first posting hadn't worked so I rewrote the question more concisely!     Yours red-faced,  Willie


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#3 TorontoTim

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Posted 17 May 2018 - 04:02 PM

No problem - I'll hide the first one.


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Tim Burgess

1961 TR4 (CT217L; October 3rd 1961)
1965 Norton Atlas

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#4 RogerH

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Posted 17 May 2018 - 04:23 PM

Hi Willie,

                   if your inlet manifold is not tightened down fully or the gasket it leaking air then you could get your symptoms.

For instance if #1 has a leak and the carburettor adjusted to try to get a correct mixture then #2 (no leak) will go rich.

 

Roger


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Time is a drug - Too much will kill you
Forgive your enemy, but remember the ass-hole's name.
never surrender, never give up and always balance your butterflies

Veni Vidi Flati
TR4A - July 1967 daily driver         2010 RBRR No.22  2014 RBRR No.69
TR4 - March 1962 transforming like the proverbial caterpillar - it's now Royal Blue and now with the chromy bits.
 
 
 
 
 

#5 Willie

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Posted 17 May 2018 - 06:40 PM

Thank you Roger. I am very relieved to hear it is not an expensive solution!

 

Best wishes    Willie


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#6 Willie

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Posted 18 May 2018 - 12:39 PM

Hi Roger,

                   Here  is the layout on my car from the Moss catalogue. That emission valve was obviously a TR4A feature.  Mine takes rocker breath straight through the air filters to the induction manifold.  I'll check tightness of the manifold bolts.

 

Best wishes     John


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