cheddaboy

So I'm doing some early planning for a future build. I've already started gathering parts and I'm stuck between these two motors. This thread is to see all the pro's and cons to make my final decision. I'm looking for reliability and versatility doing roughly 30xxxkms a year including the odd track day and a couple auto-x sessions. I'm currently running a CTSC 8psi f20 with bolt-ons, un-tuned. I like my current setup but really want that "torque"/"turbo" feel without going the turbo route. I realize this will always be an issue because of our 2L displacement. So I'm now stuck with "Should I just swap in a K24 with a Rotrex charger?" or "Should I stroke my current motor to a 2.4L and keep the CTSC along with a smaller pulley?". Money wise, the K motor seems like it would be alot more pricey but the F24 seems more straight forward. But the K has so much potential(great #'s from boltons, Ivtec,better flow through the head etc..) and is cheaper to replace if something were to happen and that's what's holding me back. I'm not looking for crazy power but really aiming for 400-450whp/300wtq, a nice torque curve, a tune on 91 oct and keep my 9k rpms.

Poll is just for kicks

S2-Kai

Mathematically, the k24 has a better rod: stroke ratio due to its taller deck height and longer rods. This will make it a more reliable engine. The only pro to the f24c is that it's a straight drop in for the s2k chassis.

MBHs2k

Correct if I'm wrong, but can a k214 handle 400-450whp on the stock bottom end reliably? You already know the f series can

wadzii

There are alot of factors to reliability that have a bigger effect than rod ratio.

The ONLY advantage a k has over and f series motor is cam availability. F series head is better, the timing system is better, the oiling system is better etc.

cheddaboy

Not looking to to head work so that isn't an issue.

s2000Junky

Neither option will allow you to run to 9k rpms, so don’t go in with that expectation. You are shifting your powerband lower in the rpm range by moving to this engine stroke. This will give you the lower rpm trq you want, but at the sacrifice of rev range. Expect to be rowing throughout the gears more often unless you lower your final drive. You will have a hard time maxing out the Novi 1000 revving to 7800-8k as well, it will require a 2.8" pulley to get you in that range of doing so, which you want if your looking for max trq/power. RR made one this size for that blower in the past, but don’t think he is doing them any longer, so you may want to start scouting out all the classifieds for a used one. The alternative would be to upgrade to a novi 1200 and get the SOS adapter plate to mount to your comptech kit. This blower will offer 350 more cfm at a lower spinning rpm, allowing you to not only max out the blower with a larger pulley ( 3") but give you more trq and hp over what you will get out of a maxed out novi 1000. You wont hit 300/450whp on the Novi 1000, even with a 2.4. But you can with a 1200 no prob.

KaNgArOo

Upgrade to the N1200 from Science of speed. And get a smaller pulley to run 16psi and maybe E85.

wadzii

There is no reason a 2.4 (k or F) cant turn 9k+ all day long with the right parts. We do it ALL the time. Will it make power that high with that blower.. I dont know. The novi 1000 will run out of gas very quickly with a 2.4 liter motor, hell the novi1000 struggles to keep up with a 2 liter motor. the novi 1200 wouldnt be far behind but would work well if you can keep a belt on it with a 3 or 3.2" pulley. We have even run k24 crank pulleys on f20's to get more boost.

APoner

Very interesting... Does it bolt right up? whats the actual diameter of the crank pulley? Is there a thread on this somewhere i missed? Did you have the outer section that bolts to OEM crank pulley machined?

cheddaboy

What if I were to rebuild the N1000 with 928 motorsports 62000rpm bearings and replace the impeller