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View Full Version : Will a s14ar head work on a s14sr bottom end


S14DOOD
03-18-2012, 11:24 PM
Ok well i have a s14sr and the bottom got messed up during assembly the block was already bored and i have brand new cp pistons and stuff for it. My question is can i use a s13sr bottom and put my s14sr head on it without any problems?

jr_ss
03-19-2012, 06:18 AM
You'll lose VTC... but yes you can.

Dirtcanhurt089
03-19-2012, 07:16 AM
Iv heard that you can't put an s14 head on s13 block but u can do s13 head on s14 block

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S14DOOD
03-19-2012, 08:32 AM
You'll lose VTC... but yes you can.

Thats what ive heard. Is there any way to do it and keep the VTC?

jr_ss
03-19-2012, 11:28 AM
As far as I know, no there isn't. Although I think adding oil feed/pressure to that particular oil passage externally would be a viable option. Dave Coleman was trying to sort this out on motoiq and I don't believe it ever came about. Then again I haven't checked that particular thread in sometime.

S14DOOD
03-19-2012, 12:37 PM
A buddy of mine was telling me that the VTC stoppes working after 9psi anyway. If i use a s13 block eill i have to change anything? and can i use everything off the bottom end of the s14?

jr_ss
03-19-2012, 12:55 PM
Your "buddy" doesn't know a damn thing.

VTC is activated by a solenoid, that allows oil through a passage into the VTC cam gear. It is a simple on/off switch but allows +/- 20 degrees of timing on the intake cam only. It is active from idle to 5200ish rpms, boost has nothing to do with it. This gives the S14/15 motor a significant amount of low-end/midrange power over the S13 engines. It also aids in spool. If you're doing a mild build, I'd keep it. My last setup made 315ftlbs of torque on 13psi from a 3071R and held over 300ftlbs until deactivation. Peak power was 360whp.

S14DOOD
03-19-2012, 12:59 PM
So i need to just find a s14sr block?

mikerbike
03-19-2012, 01:34 PM
What the Hell Happened to Project Silvia? > MotoIQ (http://www.motoiq.com/magazine_articles/id/2031/pageid/3479/what-the-hell-happened-to-project-silvia.aspx)

Is there a thread about it? I don't think I've ever looked around in their forums.

jr_ss
03-19-2012, 05:25 PM
Yes, it's under project silvia...

That would be your best option S14DOOD

S14DOOD
03-20-2012, 08:46 AM
Yes, it's under project silvia...

That would be your best option S14DOOD

Ok man thanks alot. would you happen to know anyone selling one?

jr_ss
03-20-2012, 11:50 AM
I do not, but check the forsale section, there usually is a few being sold. You could also try one of the engine vendors and see if they have any low comp short blocks available...