Fair point yet KA block is much heavier than L20b especially after L20b is bored to suit KA sized slugs.

On the L18 pictured below - the owner chose it for its weight savings even over the L20b, the L20B has better clearance 227mm vs (247mm KA24DE)making it 20mm taller allowing better design inlet tract without hitting the bonnet. So the L18 is 40mm lower than a KA with a fair it of weight savings. Not to mention 3mm off the bores is like removing 4 x 3mm thick cast iron pipes.

bare block weights -/+ 1kg bare with mains caps

A12 = 30kg
L16 = 37kg
L18 = 44kg
L20B = 50kg
KA24DE = 63kg

Those weights are from "Dave" & others on Ozdat inc myself for the first 3 engines supplied by some members to satisfy my weight based fetish. Weighing was done on bathroom scales subtracting final weights from our body.

"Ken Graham's 240+ rwbhp KA24DE Datto 1600 is the record holder for IPRA O2L at MtCotton"

I like the sound of that pity many club, hillclimb & circuit privateers dont get much coverage of their feats & cars.

At least there's a choice for those willing to toy with the front timing case & other bits for a nice "non pollution" relatively old school looking L series based engine.

Unlike rare LZ heads the KADE heads can be had at Pick-a-tart for 35 a pop on 50% specials week and L20b bottom ends for 20 or beer.

Attach file:

---

  KAL20DE.jpg (127.55 KB)

It's why the KA24 is the most popular swap in USA. Big displacement, high-flow 16-valve head -- and dirt cheap. Even the truck version is 40% more powerful than L20B and fits shorty transmission from the 720 (same length as 1200 gearbox).

Quote:

fiasss,
two quotes straight from wikipedia,

Quote:

Quote:

The f20c was produced in 1999 and held that record until 12 years later for the 2010 4.5 v8 458 italia to beat it.Thats a statement in itself.Im no big fan of honda but when it comes to NA four cyclinders u cant beat them! ive seen many a turbo cars beat by NA hondas and they cant contemplate what just took place.

Here are some other hp per liters of other NA cars,and this are not ur usually daily drives.Serious performance cars.Maybe then will have an understanding of an NA hybrid pumping out 126hp per liter.

The 997 GT3 RS 3.8 hits 116.38 wheel horsepower per liter.
The 500hp 997 GT3 RS 4.0 hits 114.25 wheel horsepower per liter.
The F430 Scuderia is at 106 wheel per liter.
553hp Lexus LFA v10 is 115.1 per liter
562hp 458 ferrari italia is 124.5hp per liter
562hp Lamborghini lp570-4 superleggera V10 is 108hp per liter

Give credit where its due...


bugatti veyron though not NA is at 125hp per liter.Forced induction cars can surpass this hp per liters.But this is about NA motors.

Thats a nice list of super cars. Bet they run all day and night too. How reliable would a 290hp 2.3L motor be ?? Or any NA motor producing 126 hp/L ??

I was told to go with the KA24DE when I was looking to fit a Z24 into my car. Maybe I should have listened. The aftermarket performance parts for the KA are abundant. There's nothing out there for the Z motor. I'm pretty sure I'll be happy with this last motor swap. The KA and 720 5 speeds fits perfectly.

Engines around 300hp/liter, naturally aspirated. So 126hp/liter can easily be done, and if done well can last a while.

The KA is certainly overlooked in Oz but maybe no longer.

Nick- supersprints are not endurance events but I gather that engine
should have no problems making that power reliably. Theres certainly
more to come from it to think the 12 valve ka24e donk in the states
where supposedly making 340hp and more. Capacity helps but its hard
to not be confident the KAL18DE (2 liter) another member is building
will see 10,000 rpm shifts and perhaps make around 126+bhp per litre.

The other engine that has potential is the QR25DE with SR20De crank
there are kits offered by some peeps in the states and works out to
be lighter with more capacity and longer rods than stroker sr22de.
QR23De or QR23DD is certainly another interesting beast but for non
pollution heritage looks KA-L-DE looks the goods.

What about Datsun A12 engine with AY semi-hemi head?
* 123 hp/liter at debut
* 169 hp/liter after development



So a 126 hp/liter with 16-valve head is easy to do. The only "trick" is to make it last a long time.

I still wonder if the AY was ever good enough as stated in the literature as Renault Gordini 807 engines in the A110 where much better units yet only managed 248bhp in sprint tune.

The one I liked was the L18 because few realise that with minimal work and 40 thou under mains a Cosworth BDA crank drops into an L series giving you the ultimate bottom end upgrade,then put a KA head on top and you have a very tough engine.