Volumetric Efficiency - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 75 Old 02-07-2018, 04:00 PM Thread Starter
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Volumetric Efficiency

Hey guys,

I am currently researching air intake capabilities of the KLR and was wondering if anyone knows what the volumetric efficiency of a stock '07 KLR engine is. Any info or a point in the right direction would be appreciated.

Most of the info I have found is theoretical info based on 100% efficiency. Some info even suggests that it is well over 100%. I have seen the flow bench test results for the air box mods and for the carb alone. What I am interested in is data for the engines' actual capability. I have found some general info on the web that suggests most gasoline engines are around 80-92% while naturally aspirated engines with high performance intake and valve train components can accomplish up to 95% and that forced induction can get up to around 115%.

Thanks in advance!

Antwon

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post #2 of 75 Old 02-07-2018, 05:54 PM
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Maybe klrchris has the info which you desire?

https://www.klrchris.com/
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post #3 of 75 Old 02-07-2018, 07:50 PM Thread Starter
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Quote:
Originally Posted by pdwestman View Post
Maybe klrchris has the info which you desire?

https://www.klrchris.com/

Unfortunately.......Not what I was hoping for. I have visited the sight multiple times and there is some useful flow bench data. What I am looking for is data that has been measured while the bike was actually running. Surely I am not the first to consider this. I have decided to purchase a synchrometer and measure real time data to determine how much CFM my "MULE" can pull on her own. Maybe the results will help shine some light on questions I have about the affects of mods to the air box and exhaust system.

I am not attempting to invalidate any previous work by any others, my hope is to add to the progress that has already been made by presenting some real time data on the situation. The flow bench tests are very useful for finding weaknesses in the system, but I want to know what the limitations are while under operating conditions. Let the ENGINE be the flow bench.

Thanks pdwestman for your assistance. The link really is helpful. It's just that, that.....I want more!!

I will be sharing my findings with the group and I welcome any input and questions!

Antwon
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post #4 of 75 Old 02-07-2018, 08:08 PM
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OK, I'm subscribed.

Splain-a-me this synchrometer thing, please!

To me that's something like a Uni-Syn that I used on twin SUs.

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Last edited by Tom Schmitz; 02-07-2018 at 08:12 PM.
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post #5 of 75 Old 02-07-2018, 08:17 PM Thread Starter
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Synchrometer is a meter that attaches behind the carb to measure air flow. Commonly used to synchronize multi carb setups. I figure I should be able to fashion some crude adapters to measure air flow with different accessories or mods installed. (I'm hoping) I will make sure to have plenty of duct tape in stock before I start!

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post #6 of 75 Old 02-07-2018, 11:22 PM
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OK. The one that I was familiar with could only handle the airflow of idle speed. I used it for the carbs on my CB350, CX500, and Triumph Spitfire's SUs.

Tom [email protected]

I lit a cigarette and dragged a smoking stand beside the chair. The minutes went by on tiptoe, with their fingers to their lips. -Philip Marlowe

'Why' and 'How' are words so important they cannot be too often used. -Napoleon Bonaparte


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post #7 of 75 Old 02-07-2018, 11:44 PM Thread Starter
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Yea turns out I made a mistake when I found the one I was going to order. It's only for low rpm as well. That's ok I got something else up my sleeve! Going digital!

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post #8 of 75 Old 02-08-2018, 09:21 AM
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Build a Mass Airflow Sensor in the air box.
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Tom [email protected]

I lit a cigarette and dragged a smoking stand beside the chair. The minutes went by on tiptoe, with their fingers to their lips. -Philip Marlowe

'Why' and 'How' are words so important they cannot be too often used. -Napoleon Bonaparte


Sting like a butterfly.
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post #9 of 75 Old 02-08-2018, 10:15 AM
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Antwon,

this discussion sounds very familiar to me; did we talk about this "elsewhere"? .....I'm assuming you are referring to the information from KLRCary.

Dave
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post #10 of 75 Old 02-08-2018, 11:15 AM
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Antwon,
You need to show us that tool and others over here,

http://www.klrforum.com/off-topic-lo...your-tool.html

pdwestman
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