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Help me understand what they do....
- WABBMW
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- Let The Good Times Roll !
Firing order 1-2-4-3 This means that the left two cylinders fire, one right after the other, then the right two fire, one right after the other. Therefore each "side" of the 4 into 2 system has quite uneven timing on the exhaust pulses - not so good for scavenging.
The 4 Into 1 arrangement has perfectly even spacing between all the exhaust pulses, since all 4 pipes come together. As one cylinder fires, it "sucks" the next cylinder's pulse along, etc. Best scavenging arrangement = less back pressure.
Also as JMKHZI mentioned, many of the stock systems have dual pipes - a smaller pipe inside the outer pipe. This is done to keep the chrome from turning blue. The trouble is, that that inside pipe is smaller in diameter ( about 1") than a good 4 Into 1, which has about 1 1/4" pipes. Again, more back pressure.
I have tried both systems on my bike. The 4 Into 1 system produced significantly more horsepower than the stock system, but it hurts gas mileage slightly, (perhaps 5%). As the 4 Into 1 system better scavenges the cylinders, it also pulls some unburned intake mixture into the exhaust during the valve overlap period - hence the poorer gas mileage.
Bill Baker
Houston, Texas
1982 KZ650 CSR
2008 Yamaha FZ1
2006 Yamaha FZ1
1977 Honda Supersport 750 four (sold)
1984 Honda Nighthawk 650 (sold)
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- l0g1c
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- Hanging on for dear life.
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l0g1c wrote:
N0NB wrote:
In the January 1983 issue of Cycle World Technical Editor Steve Anderson takes on the topic of intake and exhaust modifcations in the article "In Search of the Free Lunch". It runs six full pages and a column on the seventh. If anyone is interested I'd be happy to scan it and pass it along.
I'd very much like to read this, if it's not too much trouble. :woohoo:
It is scanned and posted on my web host . It's about 3 Megabytes and 7 pages as a PDF.
Thanks! Snagged and reading. Will pass it around to my motorcycle buddies.
'81 KZ750 LTD
'72 CB350K
Omaha, NE
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- PLUMMEN
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any increase in efficiency should also mean an increase in fuel mileage at same speed in my simple little mind anyway,the motor is not working as hard.clutch wrote: "The idea behind better fuel economy, and also the reasoning that K&N and other aftermarket intake companies use to justify better fuel economy is this:
Yes, more air, more fuel, more power HOWEVER, you are increasing horsepower and therefore get better fuel economy because under normal driving conditions and at cruising speeds (not trying to beat the guy with the Harley style of driving driving), you use less fuel because you are getting more power, you must throttle back from where you would have prior to pods to sustain your speed."
I respectfully disagree. Following that logic, a blown and injected 426 Hemi would get extraordinary fuel economy compared to a Ford Focus if they were both driving along at 55 MPH in top gear. Ed
Still recovering,some days are better than others.
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- TexasKZ
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However, small but noticeable gains in power and weight savings can be had on older machines, like KZs. The full potential of pods and aftermarket pipes can be realized only with significant mods to the engine such as cams, pistons, port work and the like.
I would also like to take exception to 650ed's criticisms of pods. I have (and know others who have) ridden my pod equipped bike in 30+ mph crosswinds and rain so heavy that cagers were pulling over and my bike never missed a beat.
Yes, you have my permission t question my sanity now.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- Locozuna
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KZ900LTD, KZ750LTD, KZ650, 72'Triumph Trident
"Over the Mountains
Of the Moon,
Down the Valley of the Shadow,
Ride, boldly ride,"
The shade replied
"If you seek for Eldorado!"
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- N0NB
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- Blue handles better
Nate
Nates vintage bike axiom: Riding is the reward for time spent wrenching.
Murphys corollary: Wrenching is the result of time spent riding.
1979 KZ650 (Complete!)
1979 KZ650 SR (Sold!)
1979 KL250 (For sale)
1994 Bayou 400 (four wheel peel )
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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