Twin carb and LPG
Posted: 03 Dec 2020, 14:39
Hi folks, 2.00 air cooled . I'm a novice and need to check something out. Recent engine rebuild and new Solex/Brosol twin carbs fitted, I also have an LPG conversion. LPG guy was having problems setting the LPG up and then discovered there was no air being sucked in through the offside carb so the LPG wasn't being drawn in. He told me the the carb is faulty. I saw it, plenty of suction on nearside and nothing on offside. It was running fine on petrol but I was told that's because the petrol goes in at the bottom whereas the LPG goes in just under the air filter so needs the suction.
Carbs are going back to supplier who have been very helpful although they are mystified why there was no suction. I'll have to have them back if there is no fault but will probs sell them. Now bought a 32/36 Twin choke Weber progressive currently being fitted.
Is anyone able to explain why a carb would not draw air in? Can the carb be faulty to that extent or is it something to do with the engine rebuild not creating suction on one side? It has chugged a little after first start but soon settled down to running smoothly. I took the original carbs back to the mech but wasn't there when he put the offside one back on...he called me and told me that one had suction therefore the new one was definitely faulty.
As said I am a novice but I like to understand things and how they work, especially when it's getting a bit expensive.
The engine was rebuilt a year ago and I've been driving all year on petrol and only recently went to get the LPG set back up so the problem has just come to light. If it is the engine rebuild, will the single carb Weber mask the problem? I'm surprised when the petrol was set up an air flow meter wasn't used because that would have shown the problem straight away?
I hope I've made sense and posted this in the right place. Anyone who can help fire away any questions at me you need to ask.
Sadly Steve Shaw who did the LPG conversion 3 years ago obviously is no longer around to ask. Steve was a great guy and a huge help to so many.
Cheers for any help, Tom
Carbs are going back to supplier who have been very helpful although they are mystified why there was no suction. I'll have to have them back if there is no fault but will probs sell them. Now bought a 32/36 Twin choke Weber progressive currently being fitted.
Is anyone able to explain why a carb would not draw air in? Can the carb be faulty to that extent or is it something to do with the engine rebuild not creating suction on one side? It has chugged a little after first start but soon settled down to running smoothly. I took the original carbs back to the mech but wasn't there when he put the offside one back on...he called me and told me that one had suction therefore the new one was definitely faulty.
As said I am a novice but I like to understand things and how they work, especially when it's getting a bit expensive.
The engine was rebuilt a year ago and I've been driving all year on petrol and only recently went to get the LPG set back up so the problem has just come to light. If it is the engine rebuild, will the single carb Weber mask the problem? I'm surprised when the petrol was set up an air flow meter wasn't used because that would have shown the problem straight away?
I hope I've made sense and posted this in the right place. Anyone who can help fire away any questions at me you need to ask.
Sadly Steve Shaw who did the LPG conversion 3 years ago obviously is no longer around to ask. Steve was a great guy and a huge help to so many.
Cheers for any help, Tom