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Author Topic: Street Bike magazine exhaust shootout 1976  (Read 1614 times)

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Offline gschuld

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Street Bike magazine exhaust shootout 1976
« on: January 20, 2019, 10:29:24 AM »
Sunday reading😉

George
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Offline gschuld

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Re: Street Bike magazine exhaust shootout 1976
« Reply #1 on: January 20, 2019, 10:30:07 AM »
More
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Offline Don R

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Re: Street Bike magazine exhaust shootout 1976
« Reply #2 on: January 20, 2019, 05:09:20 PM »
 It appears they believe the Hooker changed the mph/rpm ratio? I'm not sure what I read there, they must be dealing with some clutch slip?
« Last Edit: January 20, 2019, 05:15:55 PM by Don R »
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Offline Old Scrambler

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Re: Street Bike magazine exhaust shootout 1976
« Reply #3 on: January 21, 2019, 12:53:09 PM »
They left out the Action 4 which had an optional choice of a quiet 'muffler' with a baloney-cut tip, or an open megaphone. When combined with a K&N air-filter on my K3, 120 jets were best and 'speedo' speed went from 95 to 103 at 700-ft above sea-level.
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Offline Tracksnblades1

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Re: Street Bike magazine exhaust shootout 1976
« Reply #4 on: January 21, 2019, 05:27:46 PM »
With reference to how good Honda's pipes were, I can only wonder what Honda knew when they designed their SS 4/1 exhaust.

Good read George
👍
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Offline Don R

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Re: Street Bike magazine exhaust shootout 1976
« Reply #5 on: January 22, 2019, 10:08:13 PM »
 The 4-2-1 design of the F2 pipe seems to be popular today, a lot of guys like the cycleX 4-2-1. Although the collectors aren't stamped like Honda's pipes. I'm surprised by the difference in the collector size between the F/F1 and F2 collector. F/F1 is 2 1/2" and the F2 is closer to 1 3/4" I think. 
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No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline PeWe

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Re: Street Bike magazine exhaust shootout 1976
« Reply #6 on: January 24, 2019, 08:57:52 AM »
Thanks George!
Downloaded and saved on my disk.
I miss Yoshimura and Kerker to be compared in same test. Alfa might be a later 4-1. It got good review in Swedish Bike magazine 1983 so my bike got it to replace my scratched RC. Best power together with Yoshimura tested on a stock Suzuki GS1000 if I remember correctly.

A more open pipe means more power at top, a little bit restrictive better torque on low, right? It would be interesting to see tests on different engine modification levels.
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Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline gschuld

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Re: Street Bike magazine exhaust shootout 1976
« Reply #7 on: January 27, 2019, 07:26:07 AM »
Another article

George
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Offline gschuld

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Re: Street Bike magazine exhaust shootout 1976
« Reply #8 on: January 27, 2019, 07:27:03 AM »
George
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