What to expect from these mods to a KA24de

[onizemus]

Im planning on putting in new cams, (PDM cams stage 2) and SOHC pistons (11.6:1 comp) What HP Numbers should i expect?

Note: I also have a Cone filter and a Full 3 inch exhaust (JIC)

[:: orion ::]

ALthough your car's listed as a '90...I assume you have a DE motor.

If so, those cams and high compression *may* get you to 170rwhp, if you have a header and ECU to match...

High compression usually adds ~3-4% per point bump in compression - So take a car with 125-130rwhp stock:

Add exhaust and filter - Maybe 140rwhp.

Add 2 point bump in compression (+ 8%) - Maybe 152rwhp.

Add cams, and get maybe another 8-10rwhp.

I'd guess you could dyno over 160rwhp, but probably not without and ECU and header...

Later - Brian

[Aries]

agreed. I would expect 155-165 without header and ECU/Tuning

[onizemus]

What ecu should i get, i know hotshot is the way to go, but i also here JWT ecu rocks, but its also a grip.. Whats a good priced ecu for athe DE?

[EnzoRWD]

when u get those pistons, post some details. i know thats one mod a lot of ppl are unsure about <like me>. such as: what pistons to get (tolerances) fitment, ecu reprog needed?. Good luck and cant wait to hear how it goes.

[onizemus]

Their ka24e pistons, because of the head design it takes the compression ration up to like 11.6:1 i think

Yum OEM!!

[EnzoRWD]

right, but arent there different tolerances and sizes for each cylinder, etc, that u have to match? or can i take any set of pistons from any KA24E and pop them into my DE? it cant be that easy, can it?-Enzooo

[:: orion ::]

Just like the DE pistons, their are different grades...you chose grade based on bore size.

Choose the appropriate grade piston for your block.

- Brian

[EnzoRWD]

this is found??? where? i went looking the other day but couldnt seem to find anything.

[:: orion ::]

If I understand this correctly... :

You assume your block hasn't been bored, and based on the original size, you bore it, and select the right grade...

The grades are found in the sticky thread on the main page, called "OEM Specs" or whatever...

Here's a cut and paste:

Cylinder Bore(inner diameter):grade1: 89.000-89.010mmgrade2: 89.010-89.020mmgrade3: 89.020-89.030mm

Later - Brian

And one thing to watch out for - The early 9.1:1 SOHC pistons may not have enough clearance...i.e. they may hit the head. Check the deck clearances to be sure.

The reason I point this out is that the one high compression KA I've read about used 9.1:1s milled down to achieve 11:1 - That's "Rownan"...

Later - Brian

[EnzoRWD]

so i have to rebore the block before i can pick up the pistons? im confused. i know to pick the lesser of the two compressions from the SOHC motors, one yield 11.5 (9.1 in sohc) the other 11.0 (8.6? in sohc) i think. but how do i divine which grade my pistons are currently? i have to take it apart and find out the hard way? lol or trial and error with expensive pistons hehehe.-Enzo the idiot

[onizemus]

no clue to tell you the truth, im really looking into it currently

[Nathan]

You might luck out and get pistons that were closs enough, or you might be lucky and get pistons that were graded larger than your block. Then you could hone or bore it out to the right size.

[onizemus]

i think the bigger ones are from the ka24e truck, not the 240, those are the same

[240dreamer]

what about high compression pistons for the KA24E in the DE? Clearance problems or what? By the way, the pistons are rated at 10.5:1 IN THE KA24E. So what would they be rated at in the DE?

[I am Technoman]

What are you doing to do about fuel with such high compression?

[240dreamer]

larger injectors, higher fuel pressure...i already have a high flow fuel filter and the Walbro fuel pump. i was just wondering so i could plan for what i needed.

[Asleep Altima]

he could use a thicker head gasket but you rarely get the compression from just the pistons alone. even on chevys where the science is almost exact now, you dont get 10.5 from 10.5 pistons. you have to factor in everything. hes gonna have to measure the deck height to the piston at tdc and go from there. but im only seeing about 150 horses to the wheels...