Skunk2 High Compression Valves


jugbugz

jugbugz

1998 EK9 CTR
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pro_series_valves_headlarge.jpg


Are there any cons on having flat valves?

Also are these direct bolt on to the typeR engines?

B16a and 16B has different valve seat angles. I think they were 60 vs 45degrees. Skunk just lists them for b16 and b18 engines.
 
they are heavier than the standard valves.

something to consider if you'll be revving to 9000rpm and such on a regular basis. Otherwise, no other issues.
 
In that case, I guess its not worth it for my plan...

I'm also guessing that valve seat cut needs to be matched... therefore might as well do some head polishing etc...
 
i personally don't like the idea... there are so many other ways to raise compression, using valves just seems weird to me... there are so many better places to spend money...
 
sorry to revive an old thread,
but i thought the skunk2 flat faced valves were stock weight.
the skunk2 " standard type " valves are lighter ?

Lets just say the skunk2, stock compression, valves were lighter... would there be any perfomrance difference ?
 
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anytime you can decrease the weight of the valvetrain there is theoretical gains to be had - such as being able to rev higher. However, the biggest gain in general is based on how well the valvejob is performed.
 
portflow did the valvejob, with new stock oem B series valves lapped in.

However i was planning on changing the valves to skunk2 lightweight, if there was a benefit to have ? The valvesprings and retainers ( rocket motorsport ) are rated to minimum 10,000rpm with stock weight valve.

Im guessing two pro's :
1 : able to rev higher without risk of floating/dropping a valve ( not an issue , max rpm only to be around 9400)
2 : less wear on the rest of the valvetrain components

However, do you think there could be any sort of performance benefit ? More responsive ? More hp?
 
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RagingAngel said:
anytime you can decrease the weight of the valvetrain there is theoretical gains to be had - such as being able to rev higher. However, the biggest gain in general is based on how well the valvejob is performed.
Click to expand...

when you say valve job do you mean when the valve seats are cut like when you have a 3 angle valve job done? Or are you referring to having a valve adjustment?
 
xchipx said:
However, do you think there could be any sort of performance benefit ? More responsive ? More hp?
Click to expand...

If you can rev higher. You can make more power if the rest of your mods produce power up there.
 
Yeah i know that.
The type R valves are lighter and flow a little better, but i was wondering what sort of gain they give over a stock b valve.

But im talking about parasitic losses at a certain rpm due to having to move a heavier valve, not to mention the extra wear and tear due to having to run a higher seat pressure.
 
if the S2 valves have shaved stems like the stock ITR/CTR valves then they can account for 11% more flow IIRC. What you do with that flow is dependent on how you tune and with what cams.

as mentioned above, any time you lighten the valvetrain, it's a good thing. Higher seat pressure will wear the cams and the rocker arms faster...that's just the cost of wanting to go faster.
 
Thanks for that,

Do you think the actual weight of the valves could give a couple more hp perhaps?
 
xchipx said:
Thanks for that,

Do you think the actual weight of the valves could give a couple more hp perhaps?
Click to expand...

i think we all realize that is what your asking, and to be blunt with you that cannot be answered, that is what RA is trying to say, it is dependent on many factors and there is no use saying something like "well what if everything was perfect" cause its not, in a real world situation its just as RA said:

If you can rev higher. You can make more power if the rest of your mods produce power up there.
and
What you do with that flow is dependent on how you tune and with what cam

the main goal in power production in the head is flow not weight, weight is only a factor because it affects your ability to rev high and in regards to reliability, longevity...
 
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