Exhaust rant!
Posted: Thu Mar 01, 2012 6:10 pm
Picture the scene. You're a tuner/shop and carefully use your calculation software to design the perfect exhaust to go with the specific barrel kit. You take time and input all of the data. You work hard to make the new design fit a lambretta.
So you end up with something which hopefully will work in harmony with the barrel kit. I do appreciate the work those individuals put into the scene and I am more than willing to pay the going rate, to take into account the hard work designing and manufacturing.
But...........and it's a big but...........Why oh why then go and completely ruin the exhaust by putting a s**t stub on it where it meets the barrel? I've seen three exhausts now (got 2 costing £100's of pounds) where the stub infringes the exhaust port by at least 3mm each side. That's not including grinding the gasket flange to attempt to match half of the other part of the port which isn't restricted by the too small link pipe. I'm not talking about the flange but the circular area of the pipe who's diameter is far too small. So when it is squashed to meet the oval exhaust port it severely restricts the flow of exhaust gases. You may as well have an exhaust port 25% smaller.
So to make it work properly, I either make my own link pipe to the correct size, or send the exhaust back and try to find something which fits.
And whilst I'm on one, we all know metal distorts when heated, so why oh why don't exhaust manufacturers grind the gasket face flat after finishing the welding.
It really pisses me off that whilst the view of working to a complete bolt on solution for Lambretta's in enviable, it won't happen until exhaust manufacturers and those using them get their act together.
It's not as if we aren't prepared to pay for quality stuff. I won't tell who it is as I'll let them know directly. But you don't get it anywhere else when you buy bolt on tuning bits. Only with Lambretta stuff. It never seems to fit without some form of fettling.
So you end up with something which hopefully will work in harmony with the barrel kit. I do appreciate the work those individuals put into the scene and I am more than willing to pay the going rate, to take into account the hard work designing and manufacturing.
But...........and it's a big but...........Why oh why then go and completely ruin the exhaust by putting a s**t stub on it where it meets the barrel? I've seen three exhausts now (got 2 costing £100's of pounds) where the stub infringes the exhaust port by at least 3mm each side. That's not including grinding the gasket flange to attempt to match half of the other part of the port which isn't restricted by the too small link pipe. I'm not talking about the flange but the circular area of the pipe who's diameter is far too small. So when it is squashed to meet the oval exhaust port it severely restricts the flow of exhaust gases. You may as well have an exhaust port 25% smaller.
So to make it work properly, I either make my own link pipe to the correct size, or send the exhaust back and try to find something which fits.
And whilst I'm on one, we all know metal distorts when heated, so why oh why don't exhaust manufacturers grind the gasket face flat after finishing the welding.
It really pisses me off that whilst the view of working to a complete bolt on solution for Lambretta's in enviable, it won't happen until exhaust manufacturers and those using them get their act together.
It's not as if we aren't prepared to pay for quality stuff. I won't tell who it is as I'll let them know directly. But you don't get it anywhere else when you buy bolt on tuning bits. Only with Lambretta stuff. It never seems to fit without some form of fettling.