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Old 09-06-2009, 11:46 AM   #1
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Default Supertech valve springs

Anyone who has looked at valve springs will have noticed the numbers between standard, FM, supertech etc etc but using the known values we can have a guess at where the potential for the unknown springs will fit.
Supertech has 5 spring sets in all two match FM specs so give us a set point of 9k redline and knowing that weaker forces means lower redline we can assume the lower valvespring is an OEM replacement. So this leaves us with two springs with very agressive rates 70lbs @ 33.50mm and 74lbs @ 34.20mm. Taking two approachs (log and linear) we can find the maximum redline for these springs seems to be over 11,000rpm.
Can anyone with these or perhaps information shared by Supertech give tested maximum as these seem perfect for my build.
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Old 09-08-2009, 07:07 AM   #2
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*bump*
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Old 09-08-2009, 09:08 AM   #3
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You will be very hard pressed to see >9k rpm. You'll have a hard time finding rods that will take you above 8,500. Your money may be better spent on custom cams at 8k+, the stockers were never tuned to see those RPMs.

You will never see 10k rpm out of a miata engine.
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Old 09-08-2009, 10:40 AM   #4
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I am not asking about rods, cams or anything else. My friends miata has 214bhp on IRTBs and 9k redline so its not exactly hard for me to get the parts for raising the redline but he has gone solid lifter via custom engineering and I am trying to find the valvetrain parts for such an upgrade the rest I can already get.
Can someone with the structural engineering knowledge or experience of these valves tell me what there upper safe limit is?

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Old 09-08-2009, 04:45 PM   #5
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L o L
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Old 09-08-2009, 04:53 PM   #6
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Quote:
Originally Posted by rrjwilson View Post
can someone with the structural engineering knowledge or experience of these valves tell me what there upper safe limit is?
8,792 rpm.
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Old 09-08-2009, 05:44 PM   #7
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If you can tell me the exact thickness of the valve stem (smallest diameter), the exact weight, and how far it opens I can tell you.



I guessed on a few of these variables and got:

443,209rps....maybe something's wrong with my math.
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Old 09-08-2009, 08:21 PM   #8
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Guess I'll just use the same as Karl then as its still a little low with Joe's maths
Here is Karl's car
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Old 09-08-2009, 08:50 PM   #9
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YUP.....that's definitely a car! I can tell because there is a motor in there!
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Old 09-08-2009, 09:26 PM   #10
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He is going to have a bitch of a time stopping that car. The master is on the wrong side.
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Old 09-09-2009, 06:55 AM   #11
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Quote:
Originally Posted by webby459 View Post
He is going to have a bitch of a time stopping that car. The master is on the wrong side.
Thats how you switch from front biased brakes to using mostly the rear brakes instead. I bet he switched the handbrake to the other side of the center console to compensate so he can brake better with the fronts.
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Old 09-09-2009, 02:55 PM   #12
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i bet that its a drift car!
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Old 09-09-2009, 04:55 PM   #13
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Why do you want to rev so high? That is bad for the engine. I never rev over 3000 unless it's Sunday and then I go all the way up to 3500. My mechanic also tells me that if you double clutch, your valves will last longer.
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Old 09-10-2009, 08:55 AM   #14
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Damn..look at that massive fitting holding the breather filter in place...
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Old 09-15-2009, 05:05 PM   #15
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i bet that its a drift car!
Nope its a daily driven commute car He does have a play on a airfield occasionally with the chief Lotus test driver as they are friends.

Its a spritely lil thing and sounds fricking awesome
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