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post #1 of 8 Old 12-20-2014, 10:02 AM Thread Starter
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Throttle Body

I am just curious why Vee and other motorcycles in general have not switched over to a single throttle body and manifold.

I assume this eliminates balancing problems and allows for injectors to be positioned over the intakes.

It would appear to be both cheaper and better
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post #2 of 8 Old 12-20-2014, 10:14 AM
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Performance would suffer, especially at high rpm. Harleys have a manifold feeding two cylinders and behave accordingly, making power at low rpm and requiring large displacements. Performance is mostly about air flow and intake manifolds are flow killers.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
See https://www.stromtrooper.com/general-...nicknames.html

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post #3 of 8 Old 12-20-2014, 01:52 PM
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I think it could work okay if the engines had even firing cycles. (In a vertical twin with 360 degree cranks) but V-Twins tend to have uneven firing cycles. (What would the crank offset be for an even firing 90 degree V-Twin? Would it be really poorly balanced?)

..Tom

2006 DL650: 202,000 km 125,500 miles, Sold
2012 DL650 139,500+ km, 86,700+ miles. Sold
2015 DL1000 New July 2015 185,000+ km, 115,000 miles.

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post #4 of 8 Old 12-20-2014, 03:06 PM
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Honda NC700x.... What Greywolf said........................

06-DL1000 62000 miles....Sold...
Now 2012 Honda NC700X..37500 and counting...............FOR SALE
Now 2005 Suzuki Hayabusa..25000 and counting.......
Now 2018 Yamaha Super Tenere ES........
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post #5 of 8 Old 12-20-2014, 04:40 PM
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My son's CB250 has a single carb and a manifold. Easy as pie to tune, gutless as all shyte to ride at speed, still vibrates like any other parallel twin. The tuning simplicity is great for a new rider learning how to maintain their own machine but as mentioned the top end performance suffers.

"I've recently come to the realization that true happiness can often be found at the bottom of an empty gas tank" - Prime
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post #6 of 8 Old 12-21-2014, 06:41 AM Thread Starter
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I like the uneven firing order argument

There are MANY cars making good HP with single throttle body. There may not be room for an adequate sized manifold though
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post #7 of 8 Old 12-21-2014, 09:59 AM
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Again, the cars are running large displacement, low revving engines compared to motorcycles. Harleys have uneven firing pulses but run off an intake manifold. I don't think any bike runs an exhaust manifold. Manifolds rob power by limiting air flow, the higher the rpms the greater the limitation. Multiple throttle bodies are touted as a hot setup for high performance cars. What is the Advantage of Multiple Throttle bodies? is a short thread on a BMW car site.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
See https://www.stromtrooper.com/general-...nicknames.html

Please vote in the poll on what Strom(s) you have at https://www.stromtrooper.com/informat...-you-have.html
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post #8 of 8 Old 12-22-2014, 09:09 AM
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Oddly enough, until recient years most single pin V45-52* engines used a dual fire ignition (single firing pulse simultaneously to both cylinders). Since the Pistons were in different strokes, this resulted in "wasted spark" for one cylinder.

'09 VEE
'07 HD SEUC
'09 ST1300P
'06 ST1300
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