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Old 02-13-2010, 07:48 PM   #1
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Default Ka24de Camshaft Upgrade in the Frontier

Been researching this cam swap for a long time now.
...reading countless threads on 240 sites, nico threads, hybrid sites, you name it...
the legendary TLOOF (ka god) has done numerous write ups on the different cam specs
http://forums.nicoclub.com/zerothread/169323

i'll let you all read up if your interested- just search for ka24de cam swap

i was initially searching for a 248/232 setup from an S13/14,
but came across two 248 exhaust cams from an early model S13-


pretty tall compared to the 224/224 stock Frontier setup.


I haven't installed them yet- need a day off work so i'm not stranded if i need more time.

one issue i found was that the later model cyl heads don't have a #6 cam journal, so the S13 camshafts needed to have the rear journal oil ports and rear oil gallery plugged.




i could have just jammed some stuff in there, but wanted to do it right, so i have a machine shop drill and tap the rear oil gallery to plug the rear oil ports. cost me $60 but the guy who did the work normally charges $40 per cam, so i'm not sad.

it will prob be tuesday before i install them, so i will be letting you all know what happens.

just a note: there are some specific things you have to change to install early model cams in '98+ motors, so please read first so you don't BEND VALVES !!!

oh, i decided i might as well paint the valve cover while i had it off...

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Old 02-13-2010, 08:40 PM   #2
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That is cool, I look forward to hearing about it.
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Old 02-13-2010, 11:22 PM   #3
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nice i have bc stg 3 cams in my s13 ka-t motor debating about putting it in the d21. alot of guys do that cam swap and love it
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Old 02-14-2010, 03:48 AM   #4
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Quote:
Originally Posted by whyteboy View Post
nice i have bc stg 3 cams in my s13 ka-t motor debating about putting it in the d21. alot of guys do that cam swap and love it
sweet! those are a bit pricey for me... the 248/248 setup is close to some of the 'hot' cams from BC and JimWolf, but not quite as drastic.

how's it for day-to-day driving/ cold starts, ect...?
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Old 02-14-2010, 08:15 AM   #5
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HEELLLLLLLLLLL YEAH!

well, it's done.
was a little nerve wracking making sure everything lined up where it needed to be, didn't jump teeth, bind journals, ect...

this is what the stock cams sound like:



followed the Jim Wolf installation instructions together with a few other writeup threads.

here is the stock 224 cam VS. the 248 S13 exhaust cam:


installed new cams with lots of assembly lube:


exhaust goes in with dowel in same position as stock: 12noon

intake for the later model '98+ ka's changed to a different dowel position on the sprocket as well as changed to a single row chain- i had to use the stock sprockets, so:
-i had to move the intake sprocket exactly 4 teeth CCW to return the #1 lobes to the same position as the stock cam.



torqued it all to spec in proper order, and buttoned it all up

turned it over by hand several times to make sure there was no interference,
and fired it up:


It caught and started up instantly. went straight into a smooth idle at 900, no problem. revved it a few times- sounds good. no rattles or taps.





took it for a drive- didn't notice any low end loss like i've heard about.
felt pretty much stock as i cruised out of the neighborhood.

From a stop it accelerates close to stock until 4k, where it begins to pull hard and smooth all the way to 7k !!!

the stock powerband started at around 3500 and pulled strong until about 5500, where it fell flat on it's face.

it seems now that the powerband is much wider, more linear, and stronger- especially approaching redline.



the only loss that i noticed in this first impression is that nice lump of torque that used to be at 3500- it is now slightly less noticeable, but ramps up quickly as you pass 4000rpm.

bottom line- i REALLY like it. our trucks can always use more power, and even if this swap only nets a few more hp, the availability and range is night and day!

I really can't wait to get back to the track and beat on it a bit!
i'll keep you all posted.


NOTE: while this is a relatively easy swap, DO YOUR RESEARCH !!! there are a few things you have to take into account first, like addressing the rear journal oil gallery that needs to be plugged, and finding the right position for the new cam depending on which year motor you have. don't use this as a comprehensive how-to, more of a motivational thread
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Old 02-14-2010, 08:25 AM   #6
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Well then let me be the first to congratulate you on a sucessful mod
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Old 02-14-2010, 09:29 AM   #7
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All that with the stock throttle body, nice. Is that the same 52mm as the D21 ka24e's? Airbox looks the same. Nice little truck!

This gives me more confidence in my stock manifold, even though it may be somewhat different 'cause it's an E - I read that the TB's are the same.
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Old 02-15-2010, 02:39 AM   #8
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wow. sounds great. super smooth idle.
is that casuse both the intake and exhaust are the same duration?
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Old 02-15-2010, 07:45 AM   #9
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Quote:
Originally Posted by SeanG View Post
All that with the stock throttle body, nice. Is that the same 52mm as the D21 ka24e's? Airbox looks the same. Nice little truck!

This gives me more confidence in my stock manifold, even though it may be somewhat different 'cause it's an E - I read that the TB's are the same.
i'm not sure if it's the same intake and TB, - pretty sure the intakes are different since it's a different head than the ka24e.

my next project will be a full intake swap to S14 spec with ECU.
that's a bit more work though...
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Old 02-15-2010, 07:46 AM   #10
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Quote:
Originally Posted by sparkinframe View Post
wow. sounds great. super smooth idle.
is that casuse both the intake and exhaust are the same duration?

not sure exactly how the science behind it contributes to the idle, but if the 240's had 232/248 cams stock, then 248/248 isn't that much different- should behave itself for the most part
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