Hot answers tagged

15

Briefly: The exhaust pipes are shaped to suck gasses out of the combustion chamber over a range of RPMs. Somewhat longer: Imagine a 2 stroke engine without an exhaust*1. When the exhaust valve opens, burned gasses leave the cylinder. Leave the valve open for a long enough time and the cylinder will be at ambient air pressure. Now run the engine at a ...


7

There is this nice animation of a 2-stroke engine with an expansion chamber Source It works like this: While moving downwards after ignition, the piston exposes the exhaust opening, and the burned gas streams into the exhaust pipe like a (high pressure) shock wave. Due to the inertia, this gas will create a slight vacuum wave behind it, which helps to ...


6

Human Error I have firm belief that the cause of burned valves with short pipes is due completely to human error, lack of understanding and poor judgement. I believe this myth has been perpetuated by actual 'evidence' of having burned valves but the attribution of the cause is incorrect. Guy with burned valves story He has a hot rod he builds. He ...


5

A few things to consider if you end up doing this: A longer shaft will reduce the speed that you can safely spin the turbos up to It's got to do with something engineers call rotordynamics, although I highly doubt you would need to spin something up to 125,000 RPM for a turbojet application :) You may also find that the existing journal bearings are not ...


3

Ferrari V8's have flat-plane crankshafts, which should already give yours a very distinctive exhaust note that I believe is what you're referring to as "rasp". As such, I don't think a cross-pipe is necessary to improve sound quality. If your concern pertains to the lack of volume, it can be remedied with use of mufflers that don't suppress sound as much ...


2

These are the exact jets and shims that you will need for your 1984 Honda Gold Wing GL1200 four Main jets size 118 four Pilot jets size 38 and 8 shims for each Slide Needle, 2 shims per needle You will also need to the following 1 D-Adjuster for fuel screw adjustment Legend D-Adjuster for air/fuel on idle circuit Pilot Jet Main Jet


1

Straight pipes are not the root cause. I agree with DucatiKiller that straight pipes by themselves are not to be blamed; if the valves are prone to getting burnt there is clearly another issue going on. But they can exacerbate matters. I don't have practical experience to support this, but fluid dynamics theory would suggest this is the case. The flow ...


1

It has to get HOT. As you seem to know and elude to by asking if sitting and idling at a higher RPM could resolve the issue. If the car is fit can you just drive it in a lower gear at a higher RPM? Not savagly high like a teenager but reasonably high. If you would be in 5th on the freeway can you drive it in 4th? Some DPF's can get seriously clogged up ...


1

I have just removed a very rusted exhaust flange bolt from the bottom of the "Y" section on a Nissan 350Z. I had already broken the joint with the center section. To do this I cut the nut/bolts with an angle grinder, which left two useless stubs of a rusted bolts in the "Y" section. I drilled out one of the stubs which took hours of effort using a Cobalt ...



Only top voted, non community-wiki answers of a minimum length are eligible