KA24DE Question - Nissan Forum
S13 240SX 1989-1994 Including Silvia

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#1 Old Aug 18th, 2005, 10:32 PM
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KA24DE Question

My question is how many lbs. of boost can a KA24DE handle before having to re-enforce the internals? I wanted to do the SR20DET swap over my KA24E, but i saw a turbo kit for the KA24DE for around $900.00. The SR0DET swap runs me about $5,000.00 with labor. So i was thinking about the KA24DE swap instead. any suggestions?

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#2 Old Aug 19th, 2005, 12:36 AM
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Dont know about PSI specific, but the KA internals can hold around 400hp, if there in good shape.

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#3 Old Aug 19th, 2005, 12:59 AM
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Quote:
Originally Posted by Nismo14-180
Dont know about PSI specific, but the KA internals can hold around 400hp, if there in good shape.
Yeah they are fairly strong internally as they come. I know a guy with a DE that's pushin 365 on stock internals with no problems at all.

As for the SR, Why don't you just swap it yourself? It is much more cost efficient and you could probably get it done quicker than a shop will. And the SR shouldn't be that expensive unless it's an S15 SR or something. But even at that it should only cost you about 3 grand for the S15 SR, and maybe $1,500 for the S13 in perfect condition.

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#4 Old Aug 19th, 2005, 08:04 AM
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For a general rule I wouldn't push over 300-350 unless you are a very good tuner. I'm afraid when you start getting near upper 300's to 400's you really have to be careful how you control your fuel and timing. One small error and rods or pistons fly.

If your pistons go it your rings, in order to keep emissions down they move the top piston ring closer the the top of the piston surface, but it also makes it much less detonation resistant when boosted. So that's usually the first thing to go.

Secondly (less likely w/o forged pistons) would be sticking your rod through your block. This usually doesn't happen unless your over 400 rwhp or you aren't all that great of a tuner.

As with anything you get what you pay for. Really built block-$$$ but it also equals security and peace of mind that a stock block doesn't offer.=)

I haven't shopped SR's in awhile but it's unlikely to find a good one for $1500, normally it's more like $2500. Plus the extras you'd want to swap with.
#5 Old Aug 19th, 2005, 11:26 AM
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Quote:
Originally Posted by thedaddies
For a general rule I wouldn't push over 300-350 unless you are a very good tuner. I'm afraid when you start getting near upper 300's to 400's you really have to be careful how you control your fuel and timing. One small error and rods or pistons fly.

If your pistons go it your rings, in order to keep emissions down they move the top piston ring closer the the top of the piston surface, but it also makes it much less detonation resistant when boosted. So that's usually the first thing to go.

Secondly (less likely w/o forged pistons) would be sticking your rod through your block. This usually doesn't happen unless your over 400 rwhp or you aren't all that great of a tuner.

As with anything you get what you pay for. Really built block-$$$ but it also equals security and peace of mind that a stock block doesn't offer.=)

I haven't shopped SR's in awhile but it's unlikely to find a good one for $1500, normally it's more like $2500. Plus the extras you'd want to swap with.
does anybody know of any places that sell the whole packages pistons,rings,cams,rods etc..... what would be the price for one? I only wanna push around 350 horses max

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#6 Old Aug 19th, 2005, 07:35 PM
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build a setup capable of that hp 1st and keep it at lower boost till you have the motor built. Believe it or not 250whp is a lot of fun over the stock DE

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#7 Old Aug 19th, 2005, 11:00 PM
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YEPS!

And if you overly richen the A/F mixture.......stay away from the exhaust, trust me. Haha

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#8 Old Aug 20th, 2005, 10:14 AM
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Originally Posted by Nismo14-180
YEPS!

And if you overly richen the A/F mixture.......stay away from the exhaust, trust me. Haha
Does anybody know where i could get a KA24DE engine package for the swap?

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#9 Old Aug 20th, 2005, 12:36 PM
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Ive never really seen an engine package. I have seen alot of crate engines start popping up for around 2000. And there from some damn good shops too, well the ones i've looked at. Thats your only choice, aside from piecing one together yourself.

1991 RMS13-- DD; Slushbox, bad paint, and dents
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#10 Old Aug 20th, 2005, 06:13 PM
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Quote:
Originally Posted by fatboy509
does anybody know of any places that sell the whole packages pistons,rings,cams,rods etc..... what would be the price for one? I only wanna push around 350 horses max
The most helpful person I could find was the man that runs Import Autoperformance. It is a web site for turbo kits and other performance parts for the 240sx and WRX motors. He has been very helpful to answer questions about internals. Check the web site... SS
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#11 Old Aug 21st, 2005, 05:29 PM
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I just re-read your 1st post, buy an SR!

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#12 Old Aug 21st, 2005, 05:33 PM
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400 wheel horsepower is the limit for KA24DE stock internals, but that's with 0 miles on the KA, so it's all theoretical. Pistons, head gasket, and main bearings are all in jeopardy above 300whp. You can run 15psi on 550cc injectors on stock internals just fine.

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#13 Old Aug 21st, 2005, 05:49 PM
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Quote:
Originally Posted by bridrive55
400 wheel horsepower is the limit for KA24DE stock internals, but that's with 0 miles on the KA, so it's all theoretical. Pistons, head gasket, and main bearings are all in jeopardy above 300whp. You can run 15psi on 550cc injectors on stock internals just fine.
Blanket statements that 15 psi on a stock block is ok, doesn't work well. Since if you run a T25 that's not that much, but if you run a T67 or even a T61 like mine it'll put out almost 400 rwhp at that level. Just have to watch that.

That's a SOHC build, but the DOHC would be the same for the bottom end. I wouldn't change cams in the DOHC, since Rick has put 633 rwhp on them. I would throw a Cometic headgasket on, though so you don't have to worry about that.

Here's a short build list I made up....

Colt Turbo Cam $200
Arias 8.8:1 Pistons around $500
Eagle Rods w/ARP hardware $400 or less hopefully (not quite released yet) Substitute Crowers or Pauters (both $700)
Clevite Bearings $75
Mild Port and Polish
ARP studs $300
Gasket Kit $125
Machine Work $300-500
#14 Old Aug 21st, 2005, 09:04 PM
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Quote:
Originally Posted by thedaddies
Blanket statements that 15 psi on a stock block is ok, doesn't work well. Since if you run a T25 that's not that much, but if you run a T67 or even a T61 like mine it'll put out almost 400 rwhp at that level. Just have to watch that.

That's a SOHC build, but the DOHC would be the same for the bottom end. I wouldn't change cams in the DOHC, since Rick has put 633 rwhp on them. I would throw a Cometic headgasket on, though so you don't have to worry about that.

Here's a short build list I made up....

Colt Turbo Cam $200
Arias 8.8:1 Pistons around $500
Eagle Rods w/ARP hardware $400 or less hopefully (not quite released yet) Substitute Crowers or Pauters (both $700)
Clevite Bearings $75
Mild Port and Polish
ARP studs $300
Gasket Kit $125
Machine Work $300-500
hey rich didnt you say ivan could hook me up with clevite bearings for the KA?

car cost=$500 total parts cost so far=$4750+
#15 Old Aug 21st, 2005, 09:39 PM
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Yeah phatka-t.com sells the clevite bearings. You can also purchase them at your local machine shop as well.

http://www.phatka-t.com/engineparts.htm

FYI though Ivan no longer works there, as of last week. He recently got an offer he couldn't refuse from another shop and he now works for www.amstuned.com.
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