Forged pistons

[turtl631]

What's the bare minimum need to put in forged pistons in a ka24de? I don't want to do a full engine rebuild, change valvetrain, put in different rods. Just wondering how much it woudl cost to add some forged pistons for a little safety measure.

[nizmo240sx_22]

You'll be kickin yourself for not going ahead and rebuilding the whole engine. Just take out all the internals and have the crank polished and see if it's still in spec, have the block bored, and go from there. If i was you I'd have the stock rods shotpeened that way your motor will be good to ober 400 horse and you only have to rebuild once.

[Structure240sx]

you basically will be getting the engine rebuilt once you get pistons installed. most forged pistons are over-bored. stock rods and head are just fine. with the engine out i would get a new timing chain kit, pistons, and new bearing. the machine shop will check all the spec when they put it together.

labor really isnt that bad if you pull the motor out of the car yourself and disassemble most of it. best idea is to go to a shop and talk to them. some shops charge more for services and some less

[turtl631]

Yeah, i have like uber budget so I was just trying to see how much this would run me. I want to go with 550s, enthalpy rom tune when its done, t3/t4 50 trim, boostdesigns mani/dp/intercooler, tial 38 mm, etc. I would like to hit about 300-320 whp, but I think the ability to crank the boost a little more with the 550s will be tempting, and I'm sure that maxing out 550s on a stock block is really pushing it in terms of lengevity. i have an ACT heavy duty pressure plate with the organic disk, so I'm guessing I won't be able to hold more than 350 anyways (I'm building for street driving, mountain roads, some autoX, not drag). Maybe I should just fforce myself to keep it around 11 or 2 psi, no more. I can see this gettign expensive: forged pistons, timing chain kit, bearings, labor. I'd pull the engine myself most likely, but still. I see most people in one of 2 categories: stock block, about 280 whp or less, and then built blocks, from 320 whp on up...most seem to end up crankin the boost though, understandably. However, I don't see many people in the very high 200s/low 300s running stock blocks. Hm...

[IvanAtSPRacing]

The pistons would be the first thing that will fail on a boosted KA with proper tuning. The ring lands crap out at about 400 whp. Installing forged pistons means ripping the entire motor apart. I dont know of stock size forged pistons for the KA so this also means a bore and hone. If you have miles on the car, you will want to do a valve job and replace the valve seals. A full gasket set to keep things from leaking. While everything is apart, you would want to change the bearings also and shim the oil pressure relief spring for added oil pressure. At this point, you nearly at a full rebuild. http://www.phatka-t.com/engineparts.htm lists everything I do on a motor build.

[turtl631]

Well in that case, I'll just use the stock block. As long as i use good tuning, a mani/WG/boost controller setup that doesn't creep, and I don't do anything stupid, I should be fine.

[b16sareoverrated]

i would say the bottom end is decent to start out on, and when the ring lands go you would probally need to overbore anyways. blowing up a stock bottom end would be fun anyways.

[WDRacing]

i would say the bottom end is decent to start out on, and when the ring lands go you would probally need to overbore anyways. blowing up a stock bottom end would be fun anyways.

Very Very True...

[UltraRed2$0sx]

I might be wrong...but http://www.raceeng.com/ has Wiseco 9:1 comp stock bore Forged pistons.Correct me if im wrong.

PauL

[IvanAtSPRacing]

All I could find there was 89.5, 90, and 90.5 for the KA (20, 40, and 60 over) and they are all high compression pistons. Maybe I am not seeing it.

WI-K587M895 WIS NISSAN KA24DE:89.5mm/10.5:1* $439 KIT Check Availability WI-K587M90 WIS NISSAN KA24DE:90.0mm/10.5:1* $439 KIT Check Availability WI-K587M905 WIS NISSAN KA24DE:90.5mm/10.5:1* $439 KIT Check Availability

[Nismo_Freak]

All I could find there was 89.5, 90, and 90.5 for the KA (20, 40, and 60 over) and they are all high compression pistons. Maybe I am not seeing it.

WI-K587M895 WIS NISSAN KA24DE:89.5mm/10.5:1* $439 KIT Check Availability WI-K587M90 WIS NISSAN KA24DE:90.0mm/10.5:1* $439 KIT Check Availability WI-K587M905 WIS NISSAN KA24DE:90.5mm/10.5:1* $439 KIT Check Availability

K586 = 9:1 K587 = 10.5:1

[IvanAtSPRacing]

I believe the 586 part number is for the SOHC as they list it as just a KA24 for the 586 and a KA24DE for the 587.

I could be wrong but what I see makes sense to me.

Either way, they still dont make them in stock bore.

[Nismo_Freak]

I believe the 586 part number is for the SOHC as they list it as just a KA24 for the 586 and a KA24DE for the 587.

I could be wrong but what I see makes sense to me.

Either way, they still dont make them in stock bore.

We both are right and wrong I guess.

Wiseco claims a 46cc chamber whereas Arias claims a 43cc chamber for their DE pistons. I'd put my marbles in that they are both DOHC pistons.

[IvanAtSPRacing]

Alan, I suggest we figure this out so we dont spread mis-information.

To make things fun, I suggest we also bet on this.

You work for SPL (making suspension components second to none)I own PhatKA-T.com (making turbo kits etc second to none)

Here is the bet. If you win, I will provide you with a nice new AIP turbo manifold (value about $1) and if I win, you will provide me with ebay rear upper control arms (value about $1)

Sound good?

We can three way call Weisco on monday.

[Nismo_Freak]

http://www.raceeng.com/Flyer.pdf

K555 = SOHC.

[UltraRed2$0sx]

Im certain that they make a set 9:1 stock bore size.I got a set from them a while back.I found the order form but can't really understand much of it, maybe you guys can. This is is how its on the paper:

General informationBore size: 3.5039 @ Suggested clearance of .0030

Cam Shape: SHAPE #5: .0066" drop

Compression Height: 1.329

Piston forging: F4508TDX

Gram Weight at Inspection: 375.0-376.3

Also at the top of eh page is says:WISECO CUSTOM PISTON SPECIFICATION

Made Exclusivley for:Race ENG2602 and blah blah.......

Im guessing it was a special order they made? Anyone make anything of this info?

PauL

[Nismo_Freak]

Im certain that they make a set 9:1 stock bore size.I got a set from them a while back.I found the order form but can't really understand much of it, maybe you guys can. This is is how its on the paper:

General informationBore size: 3.5039 @ Suggested clearance of .0030

Cam Shape: SHAPE #5: .0066" drop

Compression Height: 1.329

Piston forging: F4508TDX

Gram Weight at Inspection: 375.0-376.3

Also at the top of eh page is says:WISECO CUSTOM PISTON SPECIFICATION

Made Exclusivley for:Race ENG2602 and blah blah.......

Im guessing it was a special order they made? Anyone make anything of this info?

PauL

I'm sorry but it would be rather dumb of someone to use a stock bore forged piston. There is a reason why stock bore's often aren't available, and it's typically because of the football shape the walls form after you've driven your car 50+ thousand miles. Moving to an aftermarket piston that will have a slight difference in diameter and expansion will cause blow-by.

It's an un-neccessary problem that you can avoid by doing things the proper way. The arguement for cost is irrelevent since it is marginal to the cost of the parts you are buying.

[UltraRed2$0sx]

i see your point.....Non the less they are available, if its the best option or not its a diff story.im back to a stock block anyway, just figured the info would help. Ohh well

PauL