givemethebighammer
|
| posted on 13/9/05 at 08:03 AM |
|
|
Honda carbs - unequal ram pipe lengths ?
I've been looking at my honda blackbird carbs and the two middle carbs have longer ram pipes than the outside two. Looking through various
motorbike manuals it seems that other honda bikes also have this feature (cbr400 for one). I am more curious than anything else as to why this is the
case. I seem to remember someone saying something about them but can't remember what it was.
anyone got any ideas ?
|
|
|
|
|
donut
|
| posted on 13/9/05 at 08:10 AM |
|
|
quote:
I seem to remember someone saying something about them but can't remember what it was.
annoying? 
[Edited on 13/9/05 by donut]
Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
|
|
|
NS Dev
|
| posted on 13/9/05 at 09:23 AM |
|
|
There's one theory that I have (which may be untrue but will certainly work!) which I have applied to exhausts in the past as well.
The pulse tuning of the intake lengths is conventionally set together, with all equal lengths, which then makes the intakes come into their tuned
range at the same point in the rpm range, giving a lift in power.
If the intakes are different lengths, different cylinders will hit their tuned rpm at different points when revving the engine though it's
working rev range.
Quite possibly Honda have used this to widen the power band of the engine and make it less peaky.
The same can be done for exhausts, making the tuned lengths different between 1-4 and 2-3, which enhances the torque spread of the engine.
|
|
|
