KA24e Project Red Line

[long shot]

S here's the deal recently I swapped my ka24e with another one after the oil pump went and caused rod knock. I have decide to go all Naturally Aspirated with that engine now and then drop it back it. My goals for the project are to build a high rpm head(9-10k) and get a nice torque band out of it between 2.5 and 6k rpm. Horse power is really the largest deal to me but I am shooting for somewhere around 250-300hp out of the stock engine. So far what i Have is my bad ka24e and a clean(65k mi) Ca20e and a lot of ideas and hopes. So far what i plan on doin for the winter months is tearing both engines down to see what i want n dont want. I have planned however to get the connecting rods rebored from the ca so I can put those shorteez in the ka. I then plan on getting my head and block machined to get some serious compression out of them. I'm gonna prolly throw some new piston heads on em or get my stock ones machined down. Other than that I will let my ideas fly on this one. Throughout the process of building this motor I will document it on here for you guys step by step In case anyone else is interested. Any advice or criticism u guys have you can throw this way. Tomorrow I will throw pics up of the two engines that are to be gutted.

[IanS]

You should check your numbers. Building an NA engine is incredibly time consuming, expensive, not to mention difficult.

NA engines are far more finicky, and will require a far more skilled engine builder to reach decent power numbers.

That being said, you will not reach your power goals. I have never heard of an NA KA making more than 200 horse power. These engine were never designed with performance in mind.

I will take incredibly high compression, super high revs (for a KA), perfect manifold design, thought out cam profiles, and impeccable tuning.

You cannot just use a shorter rod in the engine, this will incread displacement and compression as one. You would need to match the shorter rod with a longer thrown crank. These are things that require perfect calculation, you cant just throw a bunch of parts together and expect it to make more power. Most engine builders have entire computer programs just for figuring out bore/stroke ratios, compared to static displacement.

I wont claim to be a KA genius, the truth is I know far more about SRs, but there are still facts. There is a magic number in NA tuning. For the street, you will be very hard pressed to build an engine capable of making more than 100 horse power per liter of displacement. You will find it nearly impossible to eclipse that number while retaining a streetable power band.

You need to do more research before setting goals.

[scooz14]

i agree with everything said above.

the ka only has a partially balanced crank and will not like reving high. the sr on the other hand has a fully balance crank, like hondas, and love to rev.

im building an na kae, but im not hoping for any impressive number. 180rwhp would thrill me honestly.

[IanS]

im building an na kae, but im not hoping for any impressive number. 180rwhp would thrill me honestly.

This is another good point, it requires far less power to make a car feel fast with an NA engine.

[Cone Junky]

i agree with everything said above.

the ka only has a partially balanced crank and will not like reving high. the sr on the other hand has a fully balance crank, like hondas, and love to rev.

im building an na kae, but im not hoping for any impressive number. 180rwhp would thrill me honestly.

I'm doing the same, but my expectations are even lower (150HP to the wheels, currently 124HP to the wheels stock). Then again, due to class rules and budget I am holding back a lot of nice upgrades (full porting, cams, custom pistons, etc).