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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series.


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Old 02-19-2020, 02:51 AM   #1
gripster
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KA KA24E early 9.1:1 pistons

*** 9-9-20 Update ***

Building the engine for daily driver use and SCCA Solo II (autox) rules. As of today:

KA24E
Crank balanced
9.1:1 pistons from Traum Pistons
Cylinder head work by Rebello Racing

Questions:

Which head gasket do i get? What's better than Fel-Pro?

Head gasket bolts? Fel-Pro, Mahle, or ARP? Not exactly a high comp engine.

Which timing chain? Sealed power, Melling, or Cloyes?


*** /update ***



I'm getting a KA24E block rebuilt for my S13 and was looking for the early pistons with slightly higher 9.1:1 compression, part # 12010-40F10.

Late pistons were 8.6:1 compression.

As you can see, these early pistons are NLA/discontinued.

Link: http://datnissparts.com/x-flat-top-p...6-12010-40f10/

Did some digging and found this:

KA24 pistons in L28: https://www.classiczcars.com/forums/...istons-in-l28/

It mentions DNJ P616 flat top pistons.

Has anybody used the DNJ P616 pistons in a KA24E? Oversize also available.

I autox the car for fun and want to keep the sohc OE-spec in case i get competitive and people start protesting. ha ha. right.

Thanks for any input.
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Last edited by gripster; 09-10-2020 at 12:26 AM.. Reason: Update w/ new Qs.
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Old 02-23-2020, 03:22 AM   #2
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DNJ is horrible & I highly recommend you do not purchase that brand for anything let alone pistons. Shave a shit out of your head & use a thin head gasket.
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Old 09-10-2020, 12:23 AM   #3
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Bump for more questions, like:

For head gasket, besides the OE-spec Fel-Pro, are there MLS (spelling?) or other options to look at?
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Old 09-10-2020, 04:11 AM   #4
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Old 09-10-2020, 10:16 AM   #5
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You should be fine with FelPro and for a stock build I wouldn't worry too much about it.

Is this an HS car? I see DSP in your vehicle description. Just curious.
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Old 09-10-2020, 03:01 PM   #6
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Quote:
Originally Posted by e1_griego View Post
You should be fine with FelPro and for a stock build I wouldn't worry too much about it.

Is this an HS car? I see DSP in your vehicle description. Just curious.
FelPro it is then, thanks.

It's been under DSP since 2007. With the head work--waiting to get it back from Rebello--it cannot go back to HS.
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Old 09-10-2020, 04:11 PM   #7
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Gotcha.

Good luck taking down the RX8s and E46s
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Old 10-26-2020, 09:36 AM   #8
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mellings chains are good
and I like mahle head bolts on nonboosted engines
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Old 10-26-2020, 09:44 AM   #9
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Quote:
Originally Posted by s13 @ fullboost View Post
DNJ is horrible & I highly recommend you do not purchase that brand for anything let alone pistons. Shave a shit out of your head & use a thin head gasket.
why don't you like DNJ?
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