I need some help from the British Car Brain Trust.
Been trying to tune my tricarb. It now accelerates well, but backfires out the exhaust while coasting. Loud popping, some warbles.
What are the suspected causes?
Valves: adjusted.
Spark plugs replaced and gapped at 0.30.
Timing was difficult to set, probably due to Pertronix. Or my Harbor Freight timing light.
Engine struggles at 15 degrees; runs well over 20. I ended up rotating the distributor to get maximum RPM, then backed off 100 RPM and tightened the locking bolt. I read about that trick on another forum here.
Linkage: set
Carbs: adjusted with Colortune.
I found the middle jet had vertical movement and would not return flush with the bridge when turning the mixture nut. How can this be corrected for now? I dropped the middle needle 0.18 to compensate.
Carb rebuilds are planned for the off season, including new throttle shafts.
The fast and regular idle are finally set. 1200 and 800 RPM.
Topped up with premium fuel today.
Placed on ramps and jack stands now, to check the exhaust system for leaks. After it cools down.
I'm not an engineer or a mechanic, but I would like to learn how to properly tune my Healey.
Suggestions welcome.
Thanks.
Douglas
Been trying to tune my tricarb. It now accelerates well, but backfires out the exhaust while coasting. Loud popping, some warbles.
What are the suspected causes?
Valves: adjusted.
Spark plugs replaced and gapped at 0.30.
Timing was difficult to set, probably due to Pertronix. Or my Harbor Freight timing light.
Engine struggles at 15 degrees; runs well over 20. I ended up rotating the distributor to get maximum RPM, then backed off 100 RPM and tightened the locking bolt. I read about that trick on another forum here.
Linkage: set
Carbs: adjusted with Colortune.
I found the middle jet had vertical movement and would not return flush with the bridge when turning the mixture nut. How can this be corrected for now? I dropped the middle needle 0.18 to compensate.
Carb rebuilds are planned for the off season, including new throttle shafts.
The fast and regular idle are finally set. 1200 and 800 RPM.
Topped up with premium fuel today.
Placed on ramps and jack stands now, to check the exhaust system for leaks. After it cools down.
I'm not an engineer or a mechanic, but I would like to learn how to properly tune my Healey.
Suggestions welcome.
Thanks.
Douglas