[Spridgets] Unusually Bad Gas Mileage

[WeslakeMonza1330 at aol.com]

Ignoring the conversion from US to UK gallons which I don't have handy it  
seems like you're getting 16 mpg.
 
It won't be the engine having too big a carburettor but might be the  
carburettor having jet sizes too big and thereby running too rich.   Your 
starting point is to establish what the main jet and pump jet sizes are and  then 
debate those sizes against the spec of the engine.
 
I don't think you can make a useful mpg comparasion to a racing spridget  
unless your car has a racing engine making about the same power (like over a  
hundred at the flywheel).
 
Weslake-Monza 1330
 
 
In a message dated 29/08/2012 20:59:26 GMT Daylight Time,  
khargreaves2 at gmail.com writes:

My 59  1275 was in the garage for about a year before I finally got off my
rear  end and pulled the lump again to change the clutch and the gear box to
a  nice condition rib case. . . rebuilt slave cylinder and master  cylinder,
the regular stuff done while I had it apart.

I checked my  mileage (now that I also have a working speedo ..  it was not
working  for a long time before this last engine pull).

By way of the trip gauge  showing mileage on the speedo I burned up 4
gallons over 64 miles of  driving.  I also checked the trip gauge by our
other car knowing the  distance of a trip to the bus stop park and ride that
my wife takes to work  each day. .  .which is nearly an exact mile  from our
house . .  so I think that my trip gauge is accurate.

I have been running an OER  side draft for the past 8 years.  This is a
Japanese side draft  equivalent to an DCOE 45.  It takes all the DCOE
internals.  It  also has a float bowl adjustment as well as an accel pump
adjustment.   The carb has run flawlessly over the time I have had it.

I also have a  heavy foot.  I like to push the revs and I double clutch from
3rd to  second . .  so my driving style would work against getting  decent
mileage.  But to burn 4 gallons over 64 miles . . . not  something that I
would expect even with the way I like to  drive the  car.

Could the fault be due to the 1275 being over carbuerated?   Are there
different internal parts that I should put into the carb so that  it more
accurately measures fuel for a stock 1275?  (All stock except  for headers).


What gas mileage do 1275's get on the race  track?  Probably better than I
am getting for sure?

Any ideas  are most welcomed!

Kirk