bennetts2013 Posted July 15, 2019 Share Posted July 15, 2019 I have a 150 Superlight - Ford Sigma Engine. Idle was running too slow so I have adjusted the allen head screw on the main throttle body to run at just under 1000rpm which seems ok. There's a second adjustment allen head with anti vibration spring to balance between the throttle bodies - does anyone how is this best adjusted to make sure they are balanced? Any decent video or protocol online? Link to comment Share on other sites More sharing options...
Tom_Arundel Posted July 15, 2019 Share Posted July 15, 2019 Take air filter off Check WOT achieved and is the same on both throttle bodies with engine OFF. With engine warmed up and running and throttle closed, listen with a length of tube down each trumpet...should sound the sameORMake and use a vacuum gauge ( plate with breather hole and small bore tube + water) at closed throttle with engine running. DO NOT blip thottle or water will go in engine! OrBuy a flow meter/syncrometer (lots available from your local website)ANDBalance on centre screw, set revs on end screw, set throttle pot...and again....and again....etc. Best of luck, they are a pain to get (all 3) right but it passes the (a lot of) time!Note:- I have seen several Caterham throttle bodies which are not machined or matched as a pair or matched to the head ports. These cannot be properly balanced without a lot of fettling and realignment. Link to comment Share on other sites More sharing options...
bennetts2013 Posted July 15, 2019 Author Share Posted July 15, 2019 Thanks Tom - Will work my way down. Suspect I'll need a syncrometer! Link to comment Share on other sites More sharing options...
Tom_Arundel Posted July 15, 2019 Share Posted July 15, 2019 Tube in the ear is good fun Link to comment Share on other sites More sharing options...
anthony1956 Posted July 15, 2019 Share Posted July 15, 2019 I trod this path recently. http://www.bikerhouse.com/testsite/minister2011/support/roller_barrel_setup_k-seriesr.phpSo I did all that only to find I was in trouble with the specialist who mapped my ECU. Balance airflow, check/reset TPS, reset ECU TPS setting and there I landed in hot water. Link to comment Share on other sites More sharing options...
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