Re: Lotus fuel mixture in the Alps
Posted: Mon Aug 03, 2009 5:54 pm
Hi Guys,
Its simple really. SU and stromberg rely on Manifold pressure/airflow to lift the piston attached to which is the main jet mixture control needle. No man' pressure / airflow = no lift off the piston & needle. Controls the mixture & compensates for the lack of air flow/density. I think that's more or less it. Carb experts can keep me /us right.
Manifold pressure is really noticable in an airplane and its when man' press'/power equalizes the lift /drag that the aircrafts' ceiling is determined. Our little AA5 Grumman American topped out at about 13k ft. It would not go any higher. No power!...Fit a turbo and double the ceiling (roughly)..Then you have oxygen problems!! Not good.
Thats all folks...
Alex B....
Its simple really. SU and stromberg rely on Manifold pressure/airflow to lift the piston attached to which is the main jet mixture control needle. No man' pressure / airflow = no lift off the piston & needle. Controls the mixture & compensates for the lack of air flow/density. I think that's more or less it. Carb experts can keep me /us right.
Manifold pressure is really noticable in an airplane and its when man' press'/power equalizes the lift /drag that the aircrafts' ceiling is determined. Our little AA5 Grumman American topped out at about 13k ft. It would not go any higher. No power!...Fit a turbo and double the ceiling (roughly)..Then you have oxygen problems!! Not good.
Thats all folks...
Alex B....