Carb and Throttle body flow test - Kawasaki Teryx Forums: Kawasaki UTV Teryx Forum
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post #1 of 18 (permalink) Old 02-26-2010, 08:07 PM Thread Starter
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Carb and Throttle body flow test

I got Steve's stock and 38mm bored TB's in today so I went bak to the shop and flowef everything.


@ 10 inches @15 inches
Stock 08' carbs...........115 cfm.....................140 cfm
Stock 09' TB's.............110 cfm.....................135 cfm
38mm bord TB's...........145 cfm.....................178 cfm
My 45mm TB's modifide..198 cfm....................

Stock [email protected] lift.......125 cfm
Ported stock valve [email protected] lift.......140 cfm
Ported with 1.5mm big [email protected] lift........153 cfm
ported with 4mm big [email protected] lift.......189 cfm

One thing I wanted to see with the stock TB's is where the injectors pointed. With as much pressure as the injectors puts out I was wondering how if at all this affects the head flow. The stock injectors spray from the bottom side of the port and point towards the top of the port crossing the flow. The TB's I have the injectors spray from the top of the port and point right at the valves without crossing the flow path.Like I said I don't know if this would affect anything,just looking for answers of why the efi motors on these Kawies are making less power then the carbed models. The carbs flowed a little more but not enough to make a difference.I was going to get a set og Muzzys billet TB's to test the difference if any spraying from the bottom vs. from the top,but there isn't any dealer pricing on them, I have to pay retail
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post #2 of 18 (permalink) Old 02-26-2010, 08:54 PM
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ah hell mickey..you have plenty of money!!!buy them at retail and do your testings on them and then sell them at a reduced price and then you have very little in them.plus you can write them off as a business expense and actually not lose anything in the long run.
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post #3 of 18 (permalink) Old 02-26-2010, 09:44 PM
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Ever test FCRs? 39s and 41s
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post #4 of 18 (permalink) Old 02-26-2010, 10:15 PM
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Remember our 38mm throttle bodies are $450.00 .... exchange. You send me your throttle bodies and $450.00 and i send you a set of 38mm throttle bodies. I have been saying for about a year now these 38mm throttle bodies make HUGE GAINS on an 840 build. We feel they are plenty to support 840 builds with ported heads and +1 1/2 valves...... thanks for testing them Mickey

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post #5 of 18 (permalink) Old 02-26-2010, 11:04 PM
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Ever test FCRs? 39s and 41s
Thats what I would like to know too.

Thanks for testing these Mickey. I dont know crap about these numbers. But is the difference between stock TB's and the 38's a lot?

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post #6 of 18 (permalink) Old 02-27-2010, 04:38 AM Thread Starter
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Ever test FCRs? 39s and 41s
If I remember right they were 185 cfm @15 inches.I know they didn't flow as much as my 4mm big valve head,but they would be good on a 1.5mm big valve head like the 38mm TB's.
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post #7 of 18 (permalink) Old 02-27-2010, 04:46 AM Thread Starter
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Thats what I would like to know too.

Thanks for testing these Mickey. I dont know crap about these numbers. But is the difference between stock TB's and the 38's a lot?
When we are flowing heads you start testing valve openings at .050 off the seat and every .050 (.050,.100,.150,.200 ect)up to .400 or sometimes up to .450 depending on the came and model you are testing.When you gain 5 cfm @ 15 inches at a lift,that's a good gain.If you start seeing gains of 10 cfm or more that is very good. So yes the 38mm's are big time!
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post #8 of 18 (permalink) Old 02-27-2010, 08:47 AM
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maybe its better to have more flow than not?
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post #9 of 18 (permalink) Old 02-27-2010, 10:18 AM
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I know one big part of porting is having the higher compression to go with it, they kind of go hand in hand when you start doing engine performance. I may be off here a little, been a long time since I read about it but if I remember correctly porting does very little to a stock engine, you have to do cams and high comp pistons in order for the porting to start giving you gains! I am sure someone out there can explain it. I will go reading now and see if I can find an article I am thinking about. ??

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post #10 of 18 (permalink) Old 02-27-2010, 10:20 AM
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All i can say is bolt a set of our throttle bodies on your 840 and watch your 840 COME ALIVE. You will not beat the HP gains of our throttle bodies for the $$$$.


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