Z24 + KA24 = 300hp for a 510 in AU

Engine, Transmission and related drivetrain.
User avatar
S15DET
Supporter
Posts: 2561
Joined: 03 Dec 2004 17:02
Location: Waxhaw, NC

Z24 + KA24 = 300hp for a 510 in AU

Post by S15DET » 27 May 2015 04:43


User avatar
okayfine
Supporter
Posts: 14146
Joined: 12 Nov 2007 23:02
Location: Newbury Park, CA

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by okayfine » 27 May 2015 06:15

It would be interesting to know why they went Z24 instead of just working over a full KA24DE.
Because when you spend a silly amount of money on a silly, trivial thing that will help you not one jot, you are demonstrating that you have a soul and a heart and that you are the sort of person who has no time for Which? magazine. – Jeremy Clarkson

datzenmike
Supporter
Posts: 5630
Joined: 24 May 2006 12:40
Location: Van. Isle.

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by datzenmike » 28 May 2015 17:46

Only thing Z24 about this is the block. It would be lighter. Cylinders walls might be thicker than a KA?
"Nissan 'shit the bed' when they made these, plain and simple." McShagger510 on flattop SUs

User avatar
JordanTr
Posts: 962
Joined: 20 Feb 2013 22:27
Location: Kimberley, BC, Canada

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by JordanTr » 28 May 2015 22:23

KAs are less common in oz as well I believe since they got a 200sx with SR instead of the USDM/CDM 240sx with KA.
'72 2 door KA project | S14 Silvia RB25DET | S14 RB26DETT (sold) | '90 Audi 90Q20V (sold)

User avatar
duke
Supporter
Posts: 1863
Joined: 26 Oct 2005 14:21
Location: Santa Rosa, CA

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by duke » 28 May 2015 23:07

JordanTr wrote:KAs are less common in oz as well I believe since they got a 200sx with SR instead of the USDM/CDM 240sx with KA.
I think this may be the main reason. They only got the KA in FWD guise. If you look closely at the head, you will notice that it is different than the RWD KA head.

This engine is awesome! I have heard that the Nissan Pro Lite trucks that ran the KA24de got around 350hp normally aspirated...but they were spinning them to 9000 rpm and rebuilding them after every weekend!
Duke Schimmer

'72 2-Door 510
"Simplify and add lightness."

User avatar
Byron510
Moderator
Posts: 12467
Joined: 01 Jul 2003 23:06
Location: Maple Ridge, BC

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by Byron510 » 29 May 2015 03:13

Duke, thanks for your input on this.

What I have never understood is why go SR in our marked flooded with KA's? Turbo kits including beefier rods and pistons are quite cost effective, and parts are available off the shelf!
The SR out of the box is certainly cost effective if one wasn't going to rebuild it. But with the age of the SR's now, a used motor just doesn't seem to be the way to go in my mind.

It would seem that a mildly aspirated KA with a induction, cam and header is capable of over 200 HP, matching the stock SR's output. Once both engines are turbocharged, I wonder if there really is much of an advantage to the cylinder head architecture. Maybe the SR guys can chip in here on the discussion?

Byron
Love people and use things,
because the opposite never works.

User avatar
KCMO_68
Posts: 147
Joined: 17 Jul 2013 07:23
Location: Kansas City, MO

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by KCMO_68 » 29 May 2015 05:58

I have a Rebello Z24/KA24, but it only produces 245HP Naturally Aspirated. It's rev limit is around 7200rpms, but it's setup so that it still works on 91 pump gas.

Here is the dyno sheet from Rebello: Image

OUTthere
Posts: 88
Joined: 18 Aug 2014 15:57
Location: Coquille, Oregon

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by OUTthere » 29 May 2015 13:20

KCMO_68 what parts are used to make that combo? I'm thinking it might be a z24 shortblock with the ka24de head due to the rpm's but would love to know for sure. Recently seen a Rebello L engine that impressed me enough to try to make one using a z24 crank that doesn't require the use of race/jet fuel.

datzenmike
Supporter
Posts: 5630
Joined: 24 May 2006 12:40
Location: Van. Isle.

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by datzenmike » 29 May 2015 19:32

Custom crank. The Z is not nearly fully counter weighted enough for those RPMs.
"Nissan 'shit the bed' when they made these, plain and simple." McShagger510 on flattop SUs

User avatar
Byron510
Moderator
Posts: 12467
Joined: 01 Jul 2003 23:06
Location: Maple Ridge, BC

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by Byron510 » 29 May 2015 20:20

KCMO_68 wrote:...but it only produces 245HP Naturally Aspirated.
God damn man! That's more than enough to get into trouble - especially on a NA engine.

Also interested in the parts utilized. Did it use a single or double roller chain?


Byron
Love people and use things,
because the opposite never works.

510rob
Moderator
Posts: 4863
Joined: 09 Oct 2003 23:37
Location: Vancouver, BC
Contact:

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by 510rob » 29 May 2015 20:38

2 cams & 16 valves, or 1 cam & 12 valves?

OUTthere
Posts: 88
Joined: 18 Aug 2014 15:57
Location: Coquille, Oregon

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by OUTthere » 30 May 2015 07:54

I was lead to believe it's a ka24de head because the Rebello print out lists the engine as a LZ24DE. Just can't stop thinking about the crank that is spinning 7000+ rpm's. Maybe welded up the z24 crank so it's fully balanced, the L head I seen Dave work on that flowed 600+ cfm impressed the shit out of me!

User avatar
defdes
Supporter
Posts: 5050
Joined: 12 May 2005 14:45
Location: Vermont

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by defdes » 30 May 2015 15:44

Even with Rebello's 10% generosity with his dyno, those are still good numbers.

datzenmike
Supporter
Posts: 5630
Joined: 24 May 2006 12:40
Location: Van. Isle.

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by datzenmike » 30 May 2015 16:49

lultz.

It said custom crank with longer stroke and 2.6 liters displacement
"Nissan 'shit the bed' when they made these, plain and simple." McShagger510 on flattop SUs

datsun510
Posts: 194
Joined: 26 Apr 2005 12:19
Location: SoCal

Re: Z24 + KA24 = 300hp for a 510 in AU

Post by datsun510 » 31 May 2015 23:11

duke wrote:
JordanTr wrote:KAs are less common in oz as well I believe since they got a 200sx with SR instead of the USDM/CDM 240sx with KA.
I think this may be the main reason. They only got the KA in FWD guise. If you look closely at the head, you will notice that it is different than the RWD KA head.

This engine is awesome! I have heard that the Nissan Pro Lite trucks that ran the KA24de got around 350hp normally aspirated...but they were spinning them to 9000 rpm and rebuilding them after every weekend!
We just bought 2 pro Lite engines. They used Truck blocks that did not have the girdle, engine builder said caused too much windage in the engine and they had problems with stock oil pumps not surviving so they were dry sumped. Also since they were dry sumped with a ARE oil pan which adds the strength back to the bottom of the block. The person we bought them from said they were good for about 300 HP with 48mm webers and 42 mm chokes, could gain about 15-20 HP with 44 mm chokes with a loss of low end. He would run the engines to 8500 but said other teams with unlimited budgets would run as high as 9500.

Post Reply