mmm high comp

[tre]

[Realchaos1]

Tre, that things going to yeild quite a bit when you throw those in. Whens the engine getting blue printed?

[jdm538]

is that for a V8?????

[S14DB]

Originally Posted by jdm538

is that for a V8?????

Yea! you can count!


But really What;s the point of the thread? Just a pic. Post some info or goto the pic thread.

[orion::S14]

Sweet! You must be putting a 11.5:1 SBC into your bitchin' drift YUGO!

?????????????????????????

Info or you suck.

- Brian

[blu808]

What is the going ons?

Looks like chevy stuff

[wootwoot]

How are you fitting 8 pistons in an SR block??

[Phlip]

I will give this thread until I wake up in the morning to be made to matter, by presenting some world-changing tech information... If none is present, I lock.

[jdm538]

Originally Posted by S14DB

Yea! you can count!


But really What;s the point of the thread? Just a pic. Post some info or goto the pic thread.

was that an insult?

[blu808]

PHLIP can you lock this pos allready.

[95zilvia]

MMmmm, this thread is poooo

[tre]

WOW guys you REALLY dont know you're engines

Flat tops and i'm a KA engine guy... hmm i wonder...

3 1/2 sets of them 2 1/2 are brand new. Other set is out of an engine that put out 289hp 249tq to the crank.

[S14DB]

You're asking us to make gross assumptions here...

What are they? What are they for? What will they do/How are they better than stock?

and, how are they better than mine?

[tre]

Originally Posted by S14DB

You're asking us to make gross assumptions here...

What are they? What are they for? What will they do/How are they better than stock?

and, how are they better than mine?

Yours are dished and i got all of them for free

If i'm lucky i'd be putting out near 270crank hp IF i reuse the used ones. And put a decent tune down. But i'm looking more around 250crank hp

btw these ARE stock Pistons haha in a sense

[Slippin'eight-nine]

GOD! Are you on this forum as well spreading your fecal matter?! Stock KA pistons wooooooohooooo

[kawika219]

bwhahaha flamed on here and in hawaii

[drifter808]

^^ hahahaha!!!

[tre]

You guys crack me up. all you do is talk...

[blu808]

tre. Did you get these out of an offroad truck? I know alot of those nissan off road race trucks run high comp ka's.

[tre]

No. Those pistons would be literally GOLD. If i got those out of the truck serious engine. IF you can even buy them they'd be around 1000+(guessing) for all 4.

I dont know if nissan has a contract with JE about that though.

[blu808]

I have a hookup at cp pistons. They are the original people who designed pistons for j&e. Then they formed their own company called Cp.

Anyways i know they will make pistons in any design you want, they will even do it with an 866 wrist pin, dropped side skirts. Whatever. I would hit them up they are cool.

[tre]

The problem ( i believe ) is Nissan Comp went to JE recnetly for their design. I dont know if its even suppose to be "public" knowledge. My dad saw the pistons and was amazed. He said it was almost HALF the size of a stock piston.

[blu808]

Originally Posted by tre

My dad saw the pistons and was amazed. He said it was almost HALF the size of a stock piston.

I dont uderstand that part. Can you elaborate please.



So basically you are refering to the piston design that has been casted exclusitivity with Je? So you are refering to the nissan series trucks? Because i know there is Amature Import offroad truck race series where it can get pretty competitive, From what i know they get to around 350-400 hp.

Any ideas with that?

[BigVinnie]

Tre what you need to simplify for the forum is the difference in which a sohc piston makes higher compression.
First off all SOHC's use what is called the hemispherical head design (they have horrible flame front's, not well at producing swirl), the list can go on and on. DOHC's use a shrunken volume head design known as the pentroof which increases flame front swirl, and everything that the SOHC engines couldn't do. This means that dish hiegth is raised on all sohc pistons allowing for the higher compression in the dohc engines, but this is a big no, no using JWT cams or even PDM's for high rev applications.
Personally I do not agree with the use of the KA24e sohc pistons, the raised dish leaves no room to run high lift cams, and the oil rings are well... Not positioned to work as well as the DOHC pistons. If anything you should look more into NAPS-z 24 pistons which come flycut and would be much more suited for high rev and a high compression than normal, also allowing the use of higher lift cams.
Great so you had some stocker pistons handed to you to raise your compression.....(YAWN) It only keeps your KA limited to most of it stock settings before you bend a valve.
If anything look into something that is well worth the investmant instead of hand me downs if you plan on making a high HP NA KA.
There are so many BETTER pistons to offer like super techs, arias, CP that are designed for the dohc and will allow for better tuning as far as the valve train is concerned. Why people look for cheap power only to fuck up there engine down the road baffles me. For an affordable $450 investment any of those pistons I mentioned are much better suited.
Fuck really man if you want high compression why don't you leave the stocker DOHC pistons in and just clover leaf weld the head??? I've seen guy's make 12.1:1 CR's with head welding and stock pistons, then run massive lifting cams..... (this is the direction of my build).
So when you title a thread mmmm high comp, and all I see are sohc pistons, I'm like great this guy is where I thought it was about 6years ago....LOL

[Pank]

aaaaaaaaaaaand big vinnie posts in another N/A power thread.

I really wish you'd build a motor so i could hear it rev. you seem to know alot, i just want to see you put out something badass, already.

[blu808]

Well wernt we talking about making around a 300hp ka? Sohc pistons cant do that.

Im talking max bore, stroke, ports, etc. Lets make a 3L Ka

[BigVinnie]

Originally Posted by Pank

I really wish you'd build a motor so i could hear it rev. you seem to know alot, i just want to see you put out something badass, already.

Yeah man the progress is coming extremely slow (finances are the only thing holding me back). Paying off a 2004 frontier, and recently came across a 2005 Murano. So I am pretty limited to almost just all bolt ons and ecu tuning for now. I'm also pretty limited to shop time, since I use my girlfriends uncle shop at the vallero gas station. I may just order a built block from HRT and have Georges head shop clover leaf weld the head for me.

[tre]

Budget build his style = 289crank hp 249crank tq
With what i'm doing budget build he said i'd be around 250crank hp.

Oh he's got a machine that grinds valve reliefs and can mill pistons =\
And he used those pistons and had a powerband that started at 7k, if those cams aren't considered hot i dont know what is.

BTW PDM and JWT Cams are probably the mildest fucking cams i've seen in my life. After looking at the dyno sheet 5whp gain and powerband pushed back 500rpm =\ I find that instulitng for $500. Everyone just gets cam regrinds because its cheaper, and hotter. Setting up the valve train is key to cam regrinds. Too stiff of a spring and you'll wear down you cam lobs to nothing. He made that mistake one race. Tore down teh engine and rebuilt it.

You can talk all you want about how it shouldn't work. But i watched this engine race for 2 years straight. and then finally spin a main bearing thanks to him knife edging his crank instead of getting it done by a shop.

He used all oem parts too =\ besides cams/bolt ons/ecu




Theres two pics for now haha

[tre]

Originally Posted by blu808

Well wernt we talking about making around a 300hp ka? Sohc pistons cant do that.

Im talking max bore, stroke, ports, etc. Lets make a 3L Ka

Oh yeah the biggest you'll ever make a KA24DE is a 2450cc engine (may be off by a few CC's) We've done the math. You can't bore over 40 thousandths. 40 thousands is roughly 1mm

You can't stroke the engine. A lot less is done port/polish style to the KA head then most people think. It already breathes extremely well

[BigVinnie]

Originally Posted by tre

BTW PDM and JWT Cams are probably the mildest fucking cams i've seen in my life. After looking at the dyno sheet 5whp gain and powerband pushed back 500rpm =\ I find that instulitng for $500. Everyone just gets cam regrinds because its cheaper, and hotter. Setting up the valve train is key to cam regrinds. Too stiff of a spring and you'll wear down you cam lobs to nothing. He made that mistake one race. Tore down teh engine and rebuilt it.

Exactly my point, for having a higher lift than stock there won't be much play on valve lift with a raised dish SOHC piston. LOL I was just pointing it out.
As for me I go to Tito's machine shop, and I will get a regrind matched from a CA18de or CA16de aftermarket from JUN, or HKS just to name a few (and JDM manufacturers carry duration's past 290*). CA engines come from the L/Z/FJ/KA family of engines and use the exact same valve train as KA, this means that I can use CA cam specs as regrinds for KA cams. Most have already been researched and developed so why not just take the specs and call it your own. Especially since the CA16de and the KA24's have almost the exact same rod stroke ratio's.
BTW anything after a 270* intake duration isn't very streetable, and idle will run like shit. JWT is the best on the market for streetability and power.
Plus the reason why you didn't see too much power on these cams is because they need an ecu retune, the increased overlap allows more air. This means that cylinder temprature will rise and the knock signal will jump almost one whole point, that means you lose power on retarded ignition timing technically.
The true key to measuring the potential power of those cams on a stock ecu is to bump up the octane to something more than 97+ octane, less knock and increased ignition timing. I've seen over 10HP at the wheels with the JWT cams on a much more substantial octane fuel.