Ka24de Budget Build

ONLY for ADVANCED technical discussion about the 240sx!
brokeasstuner
Posts: 12
Joined: Tue May 03, 2011 7:17 pm
Car: Volkswagen Gti Vr6, 1994 240 Vert

Post

This is my first build ever and i thought i would share it with everyone and hopefully get some feed back.

The motor:
1992 Ka24De w/ 92k

Rebuild Plan:

Bore .20 over
Keith Black pistons
Stage 2 Brian Crower 264* Cams
Brian Crower valve springs
ARP rod bolts
ARP head studs
Decking the head and block
Commetic Gasket set


So pretty much just a mild build. I'm doing all of the machining myself. I'm in a tech school, and I'm building this for my class project. Let me know what you guys think.

Like I said its my first build, so go easy on me

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So far from tearing it down its pretty damn clean for 92k. The had is only out of spec about .006 of an inch which seems like normal wear.
I'm going to begin cleaning everything this week and beginning to machine. Will most likely begin to order parts next weekend after i get my paycheck. Let me know what you guys think!


compactfean
Posts: 2602
Joined: Thu Dec 03, 2009 10:28 am
Car: 89 240sx s13 sr gt3071r 23psi
B14 sentra ser sr20de-t 7psi
daily
Location: reno nv

Post

On the bore, you mean .020 right? Also what cr are the pistons? I would try and run a slightly smaller duration cam if its anything less then 11:1. Have you looked into fully counterweighting the crank? If that was done you could safely reach the rpms needed for the 264 cams all the time. Not saying they wont but on an n/a motor only having a 2500 rpm power band doesn't sound like much fun.

brokeasstuner
Posts: 12
Joined: Tue May 03, 2011 7:17 pm
Car: Volkswagen Gti Vr6, 1994 240 Vert

Post

yeah my bad, that was a typo, its being bored .020. and the pistons are a 92mm. For the cams, they are made for forced induction, but, they should be just fine to run. The specs on the cams said that the power band would range from 2500 all the way through 6000. But would that be with a forced induction setup that they would accomplish that? Haven't looked into counterweighting the crank. This may sound like a noob question,but what would be the advantage to doing so?

compactfean
Posts: 2602
Joined: Thu Dec 03, 2009 10:28 am
Car: 89 240sx s13 sr gt3071r 23psi
B14 sentra ser sr20de-t 7psi
daily
Location: reno nv

Post

If you fully counter weight the crank you can gain more rpms out of it. Notice that the crank doesn't have weights for the opposite side of all of the connecting rod journals. This causes vibration through the bottom and and can destroy bearings at higher rpms. with a fully counter weighted crank you can easily take the engine to a good 7200-7500 rpms safely. If they are ” turbo” style pistons most likely are lower cr. With lower cr and no turbo, the cams may feal laggy all the way up to possibly 4k rpms. 256 duration maybe even 260 (that's what I run for my street turbo car) will have a very strong pull from down low all the way to 6.5 k. 260 or 264 cams are good for upwards of 8k.

compactfean
Posts: 2602
Joined: Thu Dec 03, 2009 10:28 am
Car: 89 240sx s13 sr gt3071r 23psi
B14 sentra ser sr20de-t 7psi
daily
Location: reno nv

Post

If you decide to not fully counter weight the crank (not an easy task to do) id find maybe a 256 duration cam with a large lift. If you do counter weight the crank then the 264 or 260 cams will give you a good broad power range with a 7500 rev limit.

brokeasstuner
Posts: 12
Joined: Tue May 03, 2011 7:17 pm
Car: Volkswagen Gti Vr6, 1994 240 Vert

Post

okay, thank you, i will look further into my options


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