Hey all. This particular build will be going into my 510. At first I was looking at a KA24DE but just today I found someone with an SR20DE rwd with a sloped valve cover (S14)? I stopped and thought about things for a sec and figured the Silvia guys could help me best…and yes I have already considered turbo SR but for some reason I want to stay NA even though the dollar for dollar hp and blah blah blah.
What is better to build? Here is my criteria. I am a street driver wanting to have a bit of fun but not to the extent of wanting a role in F & F 3. I want to get the most out of a street motor. I am looking to run ITB’s and most likely an AEM computer. My highest octane would be sunoco 94. My Datsun weighs around 2000 to 2100lb’s, add a roll cage it came with, roughly 75 to 100 lbs in the weight difference of the new engine bay and I have about a 2250lb car. I AM NOT looking to gut the interior. Wikipedia claims the KA at 157hp and 160tq while the VVT SR is 163hp no torque figure listed.
My first idea was a KA24DE with a crower stroker kit. I have found several donor’s around $500 area. Stroker kit around $2000. I would attempt to get whatever i could with flywheel, cams, porting etc along with the stroker of 2.65 i believe. Thoughts on this setup please. What compression? This will be torquie correct, but how risky will high rpms be if i decide to zip it along the hwy? How much should i expect to safely lower redline? Your thoughts on power expectations.
Second idea is the SR20DE i saw today. It was RWD and had a sloped valvecover around $1000. Add a stroker kit (2.2?) plus all the bolt ons and what can I expect from this setup? Please more info to help me identify this is the correct motor i am assuming.
Am I just chasing displacement here? Obvious math choice favours a stroked KA (hell an OE KA over a stroked SR) but what about performance? How does the each engine like the stroker. I keep reading that 2.65L KA’s can be a ticking timebomb with that big stroke. I have been googling for quite a while now and cannot find much info on built up SR20de’s (did i just answer my own question?)
Go with the KA however you want, even out of the box they are fun on the street. If you only have 2200 lbs, a few bolt-ons will make it pretty fun, mod it a bit and you’ve got a wicked track/street car… assuming you’ve got the suspension to compliment.
build a dual cam ka and enjoy it turbo or other wise, if u primarily drive on the street sr’s suck balls… it’s a fact, they are only fun when giving them the foot any other time they are torqueless and boring. i’ve owned, driven and still own many high hp sr’s but for me i had more LEGAL fun on the street in a ka. it’s got the grunt low down where u need it for low rpm driving. hence the rb25 in the beater… gotta keep the lowend to make things fun imo.
I want to try and get between 220 to 240 rwhp which should give me roughly a 10:1 weight to hp ratio. I will need to stroke either engine for that high of a number. Anyone have experience with a stroked KA? What compression? Will a stroked SR get me my power goal a little more safely than the KA?
That’s gonna be really tough, I doubt anyone has broken 200whp on an N/A KA without it being absurdly high comp and needing race gas. Freshalloy and Zilvia have a lot more info on this than we do though, we mostly just hard park here.
just put a sr in, leaeve it stock. you will have more then enough fun, but like any motor, or any gearhead/enthusiast after that first month of 7psi, your gunna want more…so skip the ka and sr…unless you wanna do something crazy like try throwin a rb25 under there…but have fun. rad relocation ftw!
