EvolutionM - Mitsubishi Lancer and Lancer Evolution Community

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EvolutionM - Mitsubishi Lancer and Lancer Evolution Community (https://www.evolutionm.net/forums/)

- Evo Engine / Turbo / Drivetrain (https://www.evolutionm.net/forums/evo-engine-turbo-drivetrain-22/)

- - s3's with stock valves/pistons (https://www.evolutionm.net/forums/evo-engine-turbo-drivetrain/601926-s3s-stock-valves-pistons.html)

silverofs

Mar 9, 2012 12:40 PM

s3's with stock valves/pistons

i've searched but i couldnt find anything to confirm if you can run s3's or kelford 280's with stock pistons & valves ?? (9 mivec motor)
any help or experience would be great thanks.

CAD EVO

Mar 9, 2012 12:42 PM

Quote:

Originally Posted by silverofs (Post 10024407)

i've searched but i couldnt find anything to confirm if you can run s3's or kelford 280's with stock pistons & valves ?? (9 mivec motor)
any help or experience would be great thanks.

I'm running S2's and was told to upgrade my valve springs. I can imagine you would also need upgraded valve springs for the higher lift S3's.

95gst16g

Mar 9, 2012 01:39 PM

Yeah you really shouldn't even run the 2's or even kelford 272's with stock springs...

Svendiesel

Mar 9, 2012 01:42 PM

Aaron mentioned to a friend of mine just the other day that S2's shouldnt be revved past 7200 on stock valve springs.

S3's would raep house on everything.

silverofs

Mar 9, 2012 01:46 PM

i said nothing about stock springs.
with upgraded springs has anyone ran stock valves & pistons with s3's ??

doghouse

Mar 9, 2012 01:52 PM

Quote:

Originally Posted by silverofs (Post 10024583)

i said nothing about stock springs.
with upgraded springs has anyone ran stock valves & pistons with s3's ??

are you referring to the clearance "valve touching piston" ?

silverofs

Mar 9, 2012 02:05 PM

Quote:

Originally Posted by doghouse (Post 10024598)

are you referring to the clearance "valve touching piston" ?

correct

GGevo921

Mar 9, 2012 02:21 PM

To the OP i just asked this very question last night. Here are some of the responses i have got. take a look. https://www.evolutionm.net/forums/ev...eded-asap.html

EvoJoeIX

Mar 9, 2012 02:22 PM

S3's wont make valves hit pistons

GGevo921

Mar 9, 2012 02:24 PM

Quote:

Originally Posted by EvoJoeIX (Post 10024699)

S3's wont make valves hit pistons

Not trying to call you out but do you have proof of this. Im really looking for this info and need to know. Any proof or research you could show be greatly appreciated. So far from what ive gathered there wont be enough of a clearance but then again i have oversize valves.

EvoJoeIX

Mar 9, 2012 02:31 PM

Heres one car that does it, i know of a few others also

http://www.youtube.com/watch?v=mTOTgAhS-Q8&feature=fvst

GGevo921

Mar 9, 2012 02:35 PM

Quote:

Originally Posted by EvoJoeIX (Post 10024733)

Heres one car that does it, i know of a few others also

http://www.youtube.com/watch?v=mTOTgAhS-Q8&feature=fvst

Do you know if they had to change anything to make them work?

EvoJoeIX

Mar 9, 2012 02:38 PM

fixed link

what would you change? it says right in the description, stock motor. if thats not enough proof, i dont know what to tell you. s3's work on stock motor

the only difference in the s3 from the s2 is .2mm higher lift on the intake side. its not a huge difference in peak lift

GGevo921

Mar 9, 2012 02:47 PM

Quote:

Originally Posted by EvoJoeIX (Post 10024764)

Not so much worried about lift as duration when the valve is chasing the piston. Im also running oversize valves. had a couple people who do head porting question it thats why im just trying to be 100% sure thats all. Thank you for the input! greatly appreciated!{thumbup}:beer:

EvoJoeIX

Mar 9, 2012 02:51 PM

so if your running oversized valves, did you have your whole head built?

if so, im gonna assume it was decked. now at this point, it depends how much was taken off the head

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