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Old 07-15-2011, 07:19 AM   #1
pejsa HB
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Default KA24 - S13 blocks versus D21 blocks: IN DETAIL

ok so many of people have blown up a engine once or twice in their hardbody, and been stuck looking for d21 engines or spent some money rebuilding their existing one. and some people drop s13 engines in, or at least ask about it on here frequently. well problem is s13 ka's dont just drop in like that and i will show you the differences in the two.


#1 difference
block stiffener

Problems
you cannot use a stock d21 oil pan with this it will not clear it. and you cannot switch main caps, d21 mains are about .020 bigger
Solution
modify the oil pan. like so, you will also need to trim the internal baffling




#2
flywheel alignment pin

Problem
Cannot use d21 flywheel
solution
grind the alignment pin off and use d21 flywheel OR use s13 flywheel


#3
harmonic balancer, water pump pulley, and alternator pulley.
S13

d21

problem
s13 vibration damper wont work with d21 alternator or water pump pulley.
solution
use s13 stuff or change the pulleys


#4
starter mounting
s13

d21

problem
cannot use stock d21 starter
solution
drill threads out on block for starter mounting and use longer bolts that thread into the transmission and use the s13 starter

#5
dipstick
s13 dip stick hole (front of engine)

d21 dip stick hole (rear of engine)

Problem
cannot use forward mounting dipstick with rear sump pan
solution
drill a hole in the pan and weld the dip stick on accordingly kinda like this


#6
motor mount brackets

problem
s13 motor mount brackets wont line up with d21 motor mounts and make you engine sit higher and further back
solution
swap the brackets save yourself the headache


#7
trans mounting
(pics tomorrow)
problems
cannot use lower s13 tranny mounts with rear sump pan, cannot use d21 mounting plate/flywheel guard with s13 rear main seal.
solution
use d21 rear main seal, modify oil pan, modify d21 mounting plate, or leave it off all together.


that seems to be it ill have more pics and info as i go through this and i hope this helps others.

Last edited by pejsa HB; 07-19-2011 at 07:01 AM.
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Old 07-15-2011, 07:51 AM   #2
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#1 - Based on the specs I found for the KA24E, the main bearing caps will not interchange. So modifying the oil pan would be your best bet.

#3 - Can you measure the width of the actual woodruff key and the slot width on both crank pulleys. I had to modify my Unorthodox underdrive pulley to fit on my truck block.

#4 - On the 240 block you will need the 240 starter (longer snout to clear the block).
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Old 07-15-2011, 08:04 AM   #3
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#1 shit, well i better tear that back appart tomorrow lol

#3 please elaborate

#4 i guess i better find a s13 starter =[
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Old 07-15-2011, 01:45 PM   #4
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good job pejsa
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Old 07-15-2011, 01:48 PM   #5
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#4 you will need to drill out the threads on the block holes and get longer hardened bolts to thread into the starter.
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Old 07-15-2011, 02:18 PM   #6
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#1 cant you just grind the girdle for clearance?

also, the mount for oil filter looks to be different. can you verify this and if they can be swapped out? if they can be, ill go to the pick and pull and snag one.

Last edited by aron01; 07-15-2011 at 02:41 PM.
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Old 07-15-2011, 04:01 PM   #7
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Quote:
Originally Posted by aron01 View Post
#1 cant you just grind the girdle for clearance?

also, the mount for oil filter looks to be different. can you verify this and if they can be swapped out? if they can be, ill go to the pick and pull and snag one.
The oil filter block is interchengable. I verified this when I got my Skullworks oil filter relocator.
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Old 07-15-2011, 04:04 PM   #8
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Quote:
Originally Posted by pejsa HB View Post
#1 shit, well i better tear that back appart tomorrow lol

#3 please elaborate

#4 i guess i better find a s13 starter =[
#3 - The woodroof key that the pulley slides onto was too wide for my S13 Unorthodox pulley. Keep in mind I'm running a truck block. I just want to verify if the keys are different widths between the 2 blocks. Based on the specs I found the cranks are not interchengable between the 2 blocks.
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Old 07-15-2011, 04:06 PM   #9
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#1 This was not an issue when I swapped a KA into my 720. I used a car KA with a D21 oil pan and didn't have to modify a thing. All that I did to accommodate the rear sump pan was change to a D21 oil pickup.

I don't recall having an issue with the dipstick tube either. Maybe there are certain variations in SOHC car blocks?
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Old 07-16-2011, 03:41 AM   #10
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Quote:
Originally Posted by deathrace2000 View Post
#1 This was not an issue when I swapped a KA into my 720. I used a car KA with a D21 oil pan and didn't have to modify a thing. All that I did to accommodate the rear sump pan was change to a D21 oil pickup.

I don't recall having an issue with the dipstick tube either. Maybe there are certain variations in SOHC car blocks?
you must have gotten extremely lucky then cause for the most part s13 ka's are the same.

oh and thanks nis720 i did more research and you where right, thank god i didnt start this thing yet =0

the d21 mains are about .020 bigger than the s13's
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