Zoöid Third Times a Charm CB175
- Thread starter Texasstar
- Start date
Quixotay
New Member
might consider using a high temp protection product for the piston and combustion chamber...
http://www.cerakotehightemp.com/finishes/C-186Q/piston-coat/
for the piston skirts, (and other possibilities) micro slick
http://www.cerakotehightemp.com/finishes/C-110HQ/micro-slick-dry-film-ceramic-coating/
heat dissipation
http://www.cerakotehightemp.com/finishes/C-187Q/transfer-grey-air-cure/
there's a couple certified Cerakote applicators in your area... or do it yourself (read their MSDS sheets)....
or send to swaintech http://swaintech.com/
or do nothing...
http://www.cerakotehightemp.com/finishes/C-186Q/piston-coat/
for the piston skirts, (and other possibilities) micro slick
http://www.cerakotehightemp.com/finishes/C-110HQ/micro-slick-dry-film-ceramic-coating/
heat dissipation
http://www.cerakotehightemp.com/finishes/C-187Q/transfer-grey-air-cure/
there's a couple certified Cerakote applicators in your area... or do it yourself (read their MSDS sheets)....
or send to swaintech http://swaintech.com/
or do nothing...
Texasstar
Can't is a four letter dirty word
Yes...We have optionssimo said:
it will be interesting to see what this chamber cc's out at with the Hispeed Pistons. So we used 175 valves in the 160 head, 26mm intake and 23mm exhaust. The 175 valves are shorter than the 160 valves. R/D sent us some lash caps to get to the correct geometry. However our previous flow bench data was without the lash caps. We know by the data the 200 head breathes better but this will be interesting to see what the data is now that we have the lash caps in...I think we will take some clay and raise the floor on the exhaust port to see what happens...we may need to go back in and weld the floor up on the exhaust. We were 11.38:1 on compression when we cc'd the 160 head using Victoria's engine. The nice improvement with these Pistons is not having to deck so much to bump up the compression. We know that the flame propagation issue is solved with the lower domes. I like to think we are gaining a kiwi mindset. How do we improve this without just throwing money at the problem. Victoria cost us 350 bucks to bore to 57mm but that was still cheaper than boring cases, turning sleeves, etc. This bore was 54mm and cost 180 pesos. Our bore guy is the same guy who does a landspeed record setting bike and he thought the highspeed Pistons were excellent and they mic'd out the same. We shall see.
Texasstar
Can't is a four letter dirty word
Some of you may remember when when we tried the pac racing Mx104 valve springs and ended up in coil bind sounding like a hobbling like a Harley. Well we want to try again but this time we will measure the installed height first instead of relying on existing published data.
My notes say that our installed height on our other cb175 was 1..10" and if you subtract .270" for cam lift you end up at coil bind using the pac mx104.
So we have some titanium retainers not being used that could be. Called Zach at RD and left a message to see if he thought the PacMx101 yzf250e would work. What do y'all think? Don't know the tolerances for retainer figment. But here is the data to compare. Also the coil bind for our other racing springs is .62" FYI.
Just some random spring questions:
How do you calculate the frequency that will cause the spring to hump like a dog in heat?
Have you experience valve float and at what RPM?
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My notes say that our installed height on our other cb175 was 1..10" and if you subtract .270" for cam lift you end up at coil bind using the pac mx104.
So we have some titanium retainers not being used that could be. Called Zach at RD and left a message to see if he thought the PacMx101 yzf250e would work. What do y'all think? Don't know the tolerances for retainer figment. But here is the data to compare. Also the coil bind for our other racing springs is .62" FYI.
Just some random spring questions:
How do you calculate the frequency that will cause the spring to hump like a dog in heat?
Have you experience valve float and at what RPM?
Sent from my iPhone using Tapatalk
crazypj
Split personality, I fake being smart
It sounds like you need a valve spring tester ;D
http://www.summitracing.com/parts/pro-66834/overview/
Really need some sort of press and a way to measure height but much cheaper than a professional version
http://www.summitracing.com/parts/pro-66834/overview/
Really need some sort of press and a way to measure height but much cheaper than a professional version
Texasstar
Can't is a four letter dirty word
thanks Crazypj! We pulled the stock 160, 175 retainers and 200 retainers and springs out for comparison. The steel retainers have .015-.020" of play between the retainer and spring. The RD titanium has .0005" play. Also the 160 retainers and springs are quite a bit bigger and heavier than the 175 retainers and springs.crazypj said:
The pac racing mx101 springs have a lighter spring rate because the valves are titanium...may need to keep them for another day.
Texasstar
Can't is a four letter dirty word
Using the chart above I am trying to come up with the stock valve seat pressure for the cb175.
1.25" - 1.16= .09"
.09" =18.3 lbs
18.3 / .09 =
203.44 lbs per inch for the outer spring
Inner Spring
1.189-1.0315= .1575
9.96 lbs \ .1575 =
63.23 lbs per inch for the inner spring
.
Take free length subtract 1.17 install height
1.25 -1.17 =.082
1.189-1.17=.019
082" X 203.44 =16.68 outer
.019 X .019 = 1.2 inner
Total seat pressure 17.88 lbs
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1.25" - 1.16= .09"
.09" =18.3 lbs
18.3 / .09 =
203.44 lbs per inch for the outer spring
Inner Spring
1.189-1.0315= .1575
9.96 lbs \ .1575 =
63.23 lbs per inch for the inner spring
.
Take free length subtract 1.17 install height
1.25 -1.17 =.082
1.189-1.17=.019
082" X 203.44 =16.68 outer
.019 X .019 = 1.2 inner
Total seat pressure 17.88 lbs
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Texasstar
Can't is a four letter dirty word
Zoöid Third Times a Charm CB175
If I did the math correctly the Yamaha spring rate is 144# per inch and is lighter than the stock 175 spring.
Geeze it would be nice if they gave us the seat pressure in the manual instead of different values measure at different increments.
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that one got better reviews on Amazon! Thanks I think we are going to order it.crazypj said:
If I did the math correctly the Yamaha spring rate is 144# per inch and is lighter than the stock 175 spring.
Geeze it would be nice if they gave us the seat pressure in the manual instead of different values measure at different increments.
Sent from my iPhone using Tapatalk
crazypj
Split personality, I fake being smart
71.883lbs is coil bind height or fitted height? (23.3mm ~ 0.917")
If fitted height, your math is correct from actual measurements
This is where a spring tester is handy, you just measure at instralled height, full open height and compare whatever you have as race part (plus keep notes of everything so you know when springs weaken.)
Quick and dirty method.
Put two different springs you don't know spec end to end with a washer in between, squash down in vice or press to installed height for stock spring, measure the other spring. If it's longer than installed height, it's probably stiffer spring. Next, squash down to max open height for stock spring, compare the other spring. It should be way above length of stock.
It's actually way quicker to check than it is to type out
If fitted height, your math is correct from actual measurements
This is where a spring tester is handy, you just measure at instralled height, full open height and compare whatever you have as race part (plus keep notes of everything so you know when springs weaken.)
Quick and dirty method.
Put two different springs you don't know spec end to end with a washer in between, squash down in vice or press to installed height for stock spring, measure the other spring. If it's longer than installed height, it's probably stiffer spring. Next, squash down to max open height for stock spring, compare the other spring. It should be way above length of stock.
It's actually way quicker to check than it is to type out
