KA24DE Internal Specs OEM

Cylinder arrangement: Inline-4Displacement: 2.389L (145.78cu.in)Bore and Stroke: 89mm x 96 mm(3.50 x 3.78 inches)Valve Arrangement: DOHCFiring Order: 1-3-4-2Number of Piston Rings:-compression: 2-oil: 1Number of Main Bearings: 5Compression Ratio: 9.2:1

Compression Pressure@ 300RPMs-standard: 178psi-minimum: 149psidifference between cylinders not to exceed: 14psi

Cylinder Head and Valves

Head Distortion Limits: -standard: 0.03mm(0.0012in)-limit: 0.1mm(0.004in)

Valve Head Diameter: -intake: 36.5-36.7mm-exhaust: 31.2-31.4mm

Valve Length:-intake: 101.02-101.62mm-exhaust: 98.52-99.72mm

Valve Stem Diameter:-intake: 6.965-6.980mm-exhust: 6.945-6.960mm

Valve Seat Angle:-intake & exhaust: 45deg 15'

Valve stem end surface grinding limit: less than 0.2mm

Valve Spring Free Height: 45.79mmValve Spring Pressure: [email protected]: [email protected] Spring Out of Square: less than 2.0mm

Valve Lifter outer diameter: 33.960-33.975mmLifter guide inner diameter: 34.000-34.021mm

Clearance between lifter and lifter guide: 0.025-0.061mm

Valve Guide outer diameter:-intake & exhaust: 11.023-11.034mmservice @ 11.223-11.234mm

Valve Guide inner diameter:-intake & exhaust: 7.000-7.018mm

Stem to guide clearance: -intake(standard): 0.020-0.053mm-intake(service): 0.080-exhaust(standard): 0.040-0.073mm-exhaust(service): 0.1mm

Valve Deflection Limit: 0.2mm

Cylinder Block

Block Distortion:-standard: less than 0.03mm-limit: 0.1mm

Cylinder Bore(inner diameter):grade1: 89.000-89.010mmgrade2: 89.010-89.020mmgrade3: 89.020-89.030mm

Out of round: less than 0.015mmtaper: less than 0.010mm

difference in inner diameter between cylinders: less than 0.03mm

Nominal Block Height(from crankshaft center to deck): 246.95-247.05mm

Camshaft and Camshaft Bearings

Cam Height:-intake & exhaust: 42.415-42.605mm

Camshaft journal to bearing clearance: 0.045-0.090mm

Camshaft Runout: less than 0.2mmCamshaft End play: 0.070-0.148mm

Pistion, Rings and Pin

Skirt Dia:grade1: 88.970-88.980mmgrade2: 88.980-88.990mmgrade3: 88.990-89.000mmOversize(.5): 89.470-89.500mmOversize(1.0: 89.970-90.000mm

Piston Pin Hole dia: 20.987-20.999mmPiston to cylinder bore clearance: 0.020-0.040mm

Piston Pin Outer Diameter: 20.989-21.001mmPiston Pin to Connecting Rod Bearing: 0.005-0.017mm

Piston Ring Side Clearance:-top: 0.040-0.080mm-2nd: 0.030-0.070mm

Ring Gap:-top: 0.28-0.52mm-2nd: 0.45-.069mm-oil: 0.2-0.69mm

Connecting Rod

Center Distance: 164.95-165.05mm<<<distance from center of piston pin bearing hole to center of main bearing hole

Bend Limit: 0.15mmTorsion Limit(twist limit): 0.30mm

Little End inner dia: 23.987.24.000mmBig End inner dia: 53.000-53.013mm*without bearing installedSide Clearance: 0.2-0.4mm

Crankshaft

Main Journal Diameter: Grade0: 59.967-59.975mmGrade1: 59.959-59.967mmGrade2: 59.951.59-959mm

Pin Journal Diameter:Grade0: 49.968-49.974mmGrade1: 49.962-49.968mmGrade2: 49.956-49.962mm

Journal Taper: less than 0.002mmJournal Out of Round: less than 0.005mmRunout: 0.04mmFree End Play: less than 0.04mm

Main Bearing Clearance: 0.020-0.047mmConnecting Rod Bearing Clearance: 0.010-0.035mm

Any way we can obtain this type of information for the QR25DE engine? I am still waiting for the Chilton/Haynes to come out for the newer generation of Altimas.

Possibly, I can print out the back of the EM section of the service manual. Give me a couple days to "sneak" it out of the shop.

You rock bro, leave a copy of "War and Peace" in its place. They will never know the difference! :naughty

They might even read it...naw on second thought, it doesnt have pretty pictures.

^haha, i read it, and i was quite surprised the numbers that were shown too, nice engines

the comptesiomn ratio on the 93 and 94 240sx is 8.6:1 95-98 is 9.5:1 the 93 - 98 altima is 9.2:1 -- from chilitons

the ka24e is 8.6:1 also -- thats from nissan

Chiltions / haynes realy suck call the dealer and ask for the 800 # to get the factory repair manual its bigger than the chiltions i have that covers 93 - 98 240 / and altimas and if u think all there pitchers are there or right ur on crak get the fatcory 1 -- MoNK

i have all kinds of info on the qr25de, and i dont have much time now, but ill post it later

How big of a difference is there between say a 95 ka24 engine like is in my pickup and a new ka24??? I know they changed plug placement and now have a different cam set up, but what else??? What's the compression ratio for a 95 ka24 in a pickup?:dunce

not much really, same hp and tq ratings, just tuned slightly differently

Dang....you got it down....Only thing u forgot...Thermostat Temp specs, and Oil capacity..LOL

true, thank u, however the specs arent that different, but it does run a LIL bit hotter

theNUDdistBUDDhist wrote:the comptesiomn ratio on the 93 and 94 240sx is 8.6:1 95-98 is 9.5:1 the 93 - 98 altima is 9.2:1 -- from chilitons

the ka24e is 8.6:1 also -- thats from nissan

Chiltions / haynes realy suck...

You're right - Chiltons and Haynes don't have all the correct info...

The CORRECT specs are (for the 240SX KA):

'89 to early '90 SOHC = 9.1:1

Late '90 SOHC = 8.6:1, you can tell if it's 8.6:1 motor if it has an intake air temp sensor...

'91-98 DOHC = 9.5:1

Later - Brian

thats damn specific. good info

its better to have all the right info and be specific

any way we can post up the OE cam profiles(duration, etc...)so I know when nissan changed from the "agressive" cams to the more city driven cams (from 240-248 to 232-232, I think..)-chet(note, I know it was in 93 or something, but does anyone have the MFR date, and know for sure the cam profiles...I have a 93 and need to know what cams are in it.)

i believe they changed to the 'aggressive' cams in 91, and i think u have hte numbers right on them

Hey guys, that information is solid information, but i have a challenge for you nissan guys. Im in school right now and for one of my big projects im planning on drawing the nissan KA24DE/T or the SR20DET in a program in 3d, it will be an actual working model in an mpg clip. But theres a problem I cant seem to find the dimensions to make the block, the cams and the rockers cover, basically the outside dimensions. i dont knwo if those Haynes/Chilton books will help, i highly doubt they will although i havent tqaken a look at them yet, but if anybody can help me out with this data, please msg me back ASAP.

i think chiltons or haynes would be your best bet, search on yahoo or http://www.askjeeves.com , what program are u using, autocad14 or something?

HAHAHAHAH, nah man, we use autoCad 2004 for drafts, but the program ill be using for the animation adn the actual 3d drawing is solidedge v14, thx for the input though. ill try it out.

just curious, cause i used to do some autoCAD, and i used 14, of course this was a few years back, didnt know if they still used it anymore

Hey do any of you guys know if the FWD (transverse) KA24DEis the same block but different transmission bell housing than the RWD (longitudinal) KA24DE??Cause my friend just blew his tranny in his 97 altima and i was wondering if i could use his motor in my 240Thanks