wrongway
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posted July 31, 2011 11:47 AM
ZX-14 porting -- detailed 3rd round testing
I had some time while I waiting on bearings and a few other parts so I got back on the flow bench for more testing. I have a couple of stock heads and a couple of heads I ported. I started over, flowing all the heads with and without throttle bodies. I had always been in a rush to get the bike back on the track and never took enough time to really look at small changes and their effect.
some of the larger port work had better flow numbers , but when I put the 48mm throttle bodies with the stock air horns on they lost some of the flow. I tried a 56 mm pipe with the air horn to simuate a much larger throttle body and saw no real improvement. The 48mm throttle bodies have very little taper left in them so I dont thnk the lack of taper matters in this test.
When I started wth a stock head and made small incremental changes I was able to get a pretty good increase, but what really made my day was to see the flow with the 48mm throttle bodies get very close to the flow numbers i had with the large port design and 48 mm throttle bodies.
I am really tempted to see how the smaller runner setup compares to the larger runner setup on the dyno. I think I will have time before the sept event at maxton.
I will post some pics when I get done , I think some of y'all might be surprised at how little was done to the head to get a decent improvement.
Roy
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Compton
Zone Head
Posts: 969
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posted July 31, 2011 12:28 PM
have you been able to run a set of 48s on a bike?
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b.w.
zx14, little longer, little louder, little lower.
08 Busa, just a little longer and louder and lower than the 14
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wrongway
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posted July 31, 2011 02:09 PM
quote:
have you been able to run a set of 48s on a bike?
I have been running a set of 48's with 940 cc injectors with E85 since early this year .
Roy
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wrongway
Pro
Posts: 1078
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posted August 01, 2011 03:09 AM
ZX-14 flow testing
Stock ZX14 Ported increase
head head
NO throttle bodies 238cfm 258 cfm 8.6%
44 mm (stock) 229cfm 243 cfm 6.4%
47 MM 232cfm 249 cfm 7.5%
48 MM 235cfm 252 cfm 7.5%
Going from stock head and throttle bodies to ported head
and 48 mm throttle bodies = 10.25% increase
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Shane661
Needs a life
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posted August 01, 2011 03:17 AM
How much lift, Roy?
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wrongway
Pro
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posted August 01, 2011 05:46 AM
quote:
How much lift, Roy?
All numbers are at max lift...
But this is just reference data for people who have asked question about using 47 or 48mm throttle bodies on stock heads.
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Shane661
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Posts: 11494
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posted August 01, 2011 06:27 AM
quote:
ZX-14 flow testing
Stock ZX14 Ported increase
head head
NO throttle bodies 238cfm 258 cfm 8.6%
44 mm (stock) 229cfm 243 cfm 6.4%
47 MM 232cfm 249 cfm 7.5%
48 MM 235cfm 252 cfm 7.5%
Going from stock head and throttle bodies to ported head
and 48 mm throttle bodies = 10.25% increase
Did you have velocity stacks on there?
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dubious
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Needs more time to ride!
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posted August 01, 2011 06:54 AM
 Edited By: dubious on 1 Aug 2011 14:59
+ 3 cfm on stock head with 47mm, +6cfm with ported head
http://www.bikeland.org/board/viewthread.php?FID=27&TID=57336
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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quikgix
Expert Class
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posted August 01, 2011 06:11 PM
Are those figures at 28 inches ?
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1352cc 8.39@159mph on motor cant wait to spray this bitch
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wrongway
Pro
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posted August 01, 2011 07:17 PM
quote:
Are those figures at 28 inches ?
yes... But i only posted numbers for showing relative increases
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shiphteey
Needs a job
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posted August 02, 2011 03:52 AM
Roy, looks promising....it should back half at Maxton quite nicely.
____________
Gemini Motorcycles
Topping out everything from Ninja 250s to nitrous ZX-14s.
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RICH CRAFT 1
Zone Head
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posted August 02, 2011 12:43 PM
Edited By: RICH CRAFT 1 on 2 Aug 2011 20:45
thanks for those members Roy, I was just curious at what size bore you are flowing them at?and I know 28 inches is the industry-standard for car heads, but I've always wondered what a 14 would pull at wide-open throttle, that is vacuum at 11,000 ? I guess it could be done on a dino with a vacuum gauge.
Ken
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Red 06 ZX14 RR
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wrongway
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posted August 02, 2011 03:39 PM
quote:
thanks for those members Roy, I was just curious at what size bore you are flowing them at?and I know 28 inches is the industry-standard for car heads, but I've always wondered what a 14 would pull at wide-open throttle, that is vacuum at 11,000 ? I guess it could be done on a dino with a vacuum gauge.
Ken
I was using an 84 mm ( stock size ) bore. I was trying too get a good reference for folks with stock motors ... I havent made an 86 mm bore yet to see how much improvement you get with a bigger bore.
Roy
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RICH CRAFT 1
Zone Head
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posted August 02, 2011 04:21 PM
thanks Roy, I would be curious to see how much that 86 bore improve the flow.
Ken
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Red 06 ZX14 RR
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wrongway
Pro
Posts: 1078
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posted August 02, 2011 05:27 PM
quote:
quote:
ZX-14 flow testing
Stock ZX14 Ported increase
head head
NO throttle bodies 238cfm 258 cfm 8.6%
44 mm (stock) 229cfm 243 cfm 6.4%
47 MM 232cfm 249 cfm 7.5%
48 MM 235cfm 252 cfm 7.5%
Going from stock head and throttle bodies to ported head
and 48 mm throttle bodies = 10.25% increase
Did you have velocity stacks on there?
I had the stock air horns on the throttle bodies...
Roy
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wrongway
Pro
Posts: 1078
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posted August 02, 2011 05:29 PM
quote:
thanks Roy, I would be curious to see how much that 86 bore improve the flow.
Ken
Jim may be using an 86 or 87 mm bore on his flow bench .. he may have some numbers .
Roy
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wrongway
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posted August 03, 2011 03:43 AM
here is a pic of my bore fixture. I have a cylinder that was cut off of a top case that was damaged. I used the milling machine to true it up . The cylinder block just makes it easy to postion the head over the bore and have it aligned perfectly.
It is sitting on another 84 mm bore fixture
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wrongway
Pro
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posted August 03, 2011 03:48 AM
one of the easy things you can do is move the intake boots to get a good alignment with the intake runner . I slotted the mounting holes to get the movement I needed. that is worth 1% in flow on this head..
you can also see some of the porting just under the valve
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wrongway
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posted August 03, 2011 03:54 AM
on this head I just worked on the area under the valve seat. I used a die grinder and a sandpaper cartridge roll to remove material on the sides only ... on the bottom of the runner there is a sharp edge and all I did was break the edge and round it a bit.
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Shane661
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posted August 03, 2011 03:56 AM
Edited By: Shane661 on 3 Aug 2011 11:58
The intake boots on my stock setup were hideously misaligned, but I didn't see it until I had the motor out.
When you match the boots on the ported head, can you just use a dremel with a sanding drum?
Shane
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wrongway
Pro
Posts: 1078
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posted August 03, 2011 04:04 AM
this little bit of work can get you 6-7% , and larger throttle bodies will pick up even more. It is handy to have a flow bench to know how much better the flow is but even minimal work in these areas will see gains of 3-4%.
I have tried full porting on a couple of heads and the increase in flow was lost when the throttle bodies went on ... sometimes less is more ... I am hoping to have the motor on the dyno in a couple of weeks to see how this head compares to the others. Maybe I can even find a stock motor to test this on ....
Roy
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wrongway
Pro
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posted August 03, 2011 04:07 AM
quote:
The intake boots on my stock setup were hideously misaligned, but I didn't see it until I had the motor out.
When you match the boots on the ported head, can you just use a dremel with a sanding drum?
Shane
you can ... but in classes where stock stuff is required , you cannot port the runners. I really was interested in seeing what just the clean up around the valve seat was worth.
Roy
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wrongway
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Posts: 1078
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posted September 21, 2011 03:41 PM
I put the head on a spare stock motor and tested it out on the same dyno I have used for all my other testing here.
the motor picked up 13 hp with this head and a thin head gasket
Since I dont have the pistons to put the 1530 motor back together , I will run this motor at maxton this weekend and see what it runs.
I am planning on putting this motor in the street bike when I get the 1530 back in the race bike. That should make the stock wheelbase bike alot more fun to ride to work :-)
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dakota9498
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posted September 21, 2011 05:07 PM
Nice, looking forward to hearing how you do. You still spraying this one too?
.
____________
2008 ZX14
Never argue with a fool, onlookers may not be able to tell the difference. ~Mark Twain
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smokinZX14
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posted September 21, 2011 06:04 PM
Very good info Roy .. What you did to that head is what my friend did to Jesses Head .. We picked up 13 HP just as you did .. It's a great bump in power with very little work .. I can't wait to see how you do at Maxton ..
____________
Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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