question about KA's????

[DrifterBoy240]

okay i have been thinking of an engine swap and i really dont want to do an SR swap or RB, so i was thinking what about doing an engine swap from a later model 240sx, i have a 1991 240sx and what if i did an S14 engine swap what would i need to do???/ i know i woudl need to change the wire harness from OBS 1 to OBD2, but what gains woudl i get and what losses would i get? can i just do a long block swap?

i know i might get chewed out for this but i was just thinking of it and just thought i might ask.

and i have brian crower cams, hotshot header, cat-back, intake, and coilovers.

soon to come injectors, adjustable FPR, underdrive pully, light weight flywheel, light wheight drive shaft.

[nismo_power]

hmmm..do u know what motor comes in the s14...its the same freakin engine as the one u got the only thing will be i guess lower milage???

[xTearsFallForeverx]

it is the same engine basically. a few differences. Actually the year of ka you have has more aggressive cams then the s14 KA's had.. I would stick your 91 engine. Just rebuild it if it had high miles. Thats what I have sitting in my garage waiting to be built.

[DrifterBoy240]

i thought so i just could remember which one was better cause i have driven a S14 with the sam mods as i have, and it didnt even seem slower it felt kinda the same.

[nzmoman]

the rebuild will probably make you feel much better thant doing the swap...it will give you a chance to pick and drop a motor and learn your inner workings...good luck...I am debating a KA rebuild myself.

[S13DrIfTmEkAnIcS]

it is the same engine basically. a few differences. Actually the year of ka you have has more aggressive cams then the s14 KA's had.. I would stick your 91 engine. Just rebuild it if it had high miles. Thats what I have sitting in my garage waiting to be built.

def. true, stick with the s13. i'm only going with an s14 motor because its what i had readily avalible. i'm putting my s13 cams in it, my s13 intake and exhaust manifolds, and maf. using the s13 wire harness and ecu. basicly an s13 but not technicly. stick with the s13, put low compression pistons and turbo the crap out of it

[WI_S14_Goldie]

Benefits: S14 KA has a "higher" compression, with the S13 Cams it'll be a little peiper than the S13 KA...

[Bigvinnie]

Benefits: S14 KA has a "higher" compression, with the S13 Cams it'll be a little peiper than the S13 KA...

Where do you get your info from?????Last I checked the flame front was changed slightly on s14 KA's not the CR ratio, this means the shape of the pentroof head has less chance of knock and ping on s14 KA's. They all run 9.5:1 CR....Swapping an s14 engine into a s13 will run 6 horse power less than the s13 KA due to the cams, it will also run into smog issues since the ecu tune on the s13's runs a bit richer and ignition timing is a little less aggressive.If anything he would want to keep his s13 KA and remove the SCV's to make even more power.

[neverlift]

glad to see someone who actually likes the idea of not choking thier car at higher rpm.

btw listen to the bigvinnie he knows his shiz,really we got tons of cam info here thanks to some people no names but they know who they are.

[DrifterBoy240]

yea i think i will stick with the rebuild and i actually have a spare S13 block in my garage. the guy that i got it from did a timing chain on it and didt mark the cams, and everyone knows where this went, well lets just say that the block is all ripped apart waiting for me to put some $$$ into it but now that i think about it i just might as well build that KA to kinda a stock spec, like doing single cam pistons, up grading there rod and main bearings, gasket match the intake/exhaust ports, new gaskets everywhere and nismo thermostat, JWT cam gears, anyting else???? am i missing anyting???

BTW bigvinnie, if i run the JWT adjustable cam gears what would be the best degree's to put the at??? like how far advance or retarded i can go on the cams, just so i know so i dont get all crazy. thanks

[Bigvinnie]

BTW bigvinnie, if i run the JWT adjustable cam gears what would be the best degree's to put the at??? like how far advance or retarded i can go on the cams, just so i know so i dont get all crazy. thanks

Cam placement is dependent on the ignition timing of the engine within the 3rd stroke and the amount of fuel that you plan to deliver during the first stroke cycle, there is no direct mathmatic formula for cam placement . I can't answer cam placement for you since it is different upon the application or build process that you decide to do. As far as I know Nissan only allows so much play in the advancement or retarding of cam placement. From stock cam placement that means you can only retard +/- 12 degress. Don't bother advancing intake cams either, advancing will only further decrease power. The only time I see the advancement of an intake cam is when an engine goes turbocharged on lots of boost, but that isn't the case for naturally aspirated engines. Just as honda,Nissan, and Toyota use different methods of variable valve adjustment timing systems there is one thing in common, during high rev or WOT the cams retard to somewhat super charge the intake system by increasing velocity to the cylinder this also increases the potential inlet air mass before the valve closes (this raises engine VE), in much regard it increases the power band to it's redline, and even quite possible passed redline whihc can be dangerous for the engine.

Also if you are going to rebuild the engine, stick with the stock dohc pistons. Valve clearance is an issue with the KA24de's. Clover leafing and radiusing is the route to take and make alot of power, just by modifying the shape of the pentroof head.

[DrifterBoy240]

Cam placement is dependent on the ignition timing of the engine within the 3rd stroke and the amount of fuel that you plan to deliver during the first stroke cycle, there is no direct mathmatic formula for cam placement . I can't answer cam placement for you since it is different upon the application or build process that you decide to do. As far as I know Nissan only allows so much play in the advancement or retarding of cam placement. From stock cam placement that means you can only retard +/- 12 degress. Don't bother advancing intake cams either, advancing will only further decrease power. The only time I see the advancement of an intake cam is when an engine goes turbocharged on lots of boost, but that isn't the case for naturally aspirated engines. Just as honda,Nissan, and Toyota use different methods of variable valve adjustment timing systems there is one thing in common, during high rev or WOT the cams retard to somewhat super charge the intake system by increasing velocity to the cylinder this also increases the potential inlet air mass before the valve closes (this raises engine VE), in much regard it increases the power band to it's redline, and even quite possible passed redline whihc can be dangerous for the engine.

Also if you are going to rebuild the engine, stick with the stock dohc pistons. Valve clearance is an issue with the KA24de's. Clover leafing and radiusing is the route to take and make alot of power, just by modifying the shape of the pentroof head.

okay thanks alot for the info, if i get the JWT cam adjusters i will have to take it to a dyno and pretty much just play with fuel/timing/cams position all at once, and to see what gets me the best combo for everything put together.

i do also plan on getting my ECU tuned by RS enthalpy so i will hopefully have more than enough power after everything is done and i can just finish up suspension.

[WI_S14_Goldie]

Where do you get your info from?????Last I checked the flame front was changed slightly on s14 KA's not the CR ratio, this means the shape of the pentroof head has less chance of knock and ping on s14 KA's. They all run 9.5:1 CR....Swapping an s14 engine into a s13 will run 6 horse power less than the s13 KA due to the cams, it will also run into smog issues since the ecu tune on the s13's runs a bit richer and ignition timing is a little less aggressive.If anything he would want to keep his s13 KA and remove the SCV's to make even more power.

I forgot who told me, but this was a while back...He said that since the S14 KA had higher compression they were forced to use less "aggressive" cams to make it 155horses...