Is a ka24de a non-interference engine?

[Sketch_hs]

Is a ka24de a non-interference engine?

[InsanityInc]

definitely an interference engine.

I don't think any modern car engines are non-interference.

[Sketch_hs]

definitely an interference engine.

I don't think any modern car engines are non-interference.

okay, thanks and acutally there are a lot of modern non-interference motors out there

[AZhitman]

I'm pretty sure the KA is a NON-INTERFERENCE engine... here's a listing of Nissan motors and their configuration: (http://www.preferredcomponents.com/Nissan.htm).

However, I'm seeing SEVERAL "expert sources" that disagree, so I think it warrants further investigation.

Several modern engines remain non-interference, including several modern Nissan and Toyota designs.

However, in all fairness, nothing is carved in stone when it comes to auto repair. Interference engines sometimes survive belt breakage, while I have seen non-interference engines bend valves when the belt fails...

[Sketch_hs]

i missed out on the sale anyways damn it!

[BadMojo]

I'm pretty sure the KA is a NON-INTERFERENCE engine... here's a listing of Nissan motors and their configuration: (http://www.preferredcomponents.com/Nissan.htm).

I'm pretty sure any breaking of the timing chain would cause and epic clash between valves and pistons.

I really think that website is wrong. The only engines they show as interference designs are the ones with timing belts. I wonder if the assumption they're making is that a chain won't break. Nissan doesn't consider it a wear item like a belt would be.

Judging from the posts I've seen here where people ****ed up the valve timing royally, I'm pretty sure the KA is an interference design (SR and CA series too).

[AZhitman]

Probably right... I'm finding more sources that say it IS an interference motor.

I was surprised at some of the Toyota motors that aren't....

[TheOne]

it is an interference engine, thats why when you first put cams back in, you are to turn the engine by hand crankin to make sure that valves don't hit pistons.

(btw, my brother put the cams in wrong, without checkin, and well lets just say after we started the car(ka24de, 240sx) something made a really bad sound and well, valves hit pistons)

belt driven cams are more prone to interference due to the belt bein able to snap.(depending on the engine and how the head is designed)(of which, this happened to me in a 95 eclipse RS, i was on the highway @ 70mph, i believe the belt tensioner let loose, which let the belt loose, which the valves hit the pistons...after that there was no compression left:) )

[BadMojo]

Probably right... I'm finding more sources that say it IS an interference motor.

I was surprised at some of the Toyota motors that aren't....

I don't think it's a big deal with the KA. Being a timing chain, it'll give you plenty of warning before it goes unlike a belt which can just snap with no warning.

Anyway, from what I understand an interference design allows running a higher lift cam, keeping valves open longer and also gives engine designer more options in optimal valve placement. I'd imagine some combination of performance needs, reliability and NVH (chains are freaking loud) goes in to decisions on engine design.

[rsmithdrift]

My VG30E from my old school Z31 was off 4 notches on the right cam when I got it. I drove it home from florida that way......600 miles.

Then drove it for 2 months daily like that and didn't loose one ioda of compression during the whole thing.

It would make ungodly noises after 3k rpm and loose all of it's power. NOBODY could figure out what it's problem was. Like magic all of it's issues were solved when I did a timing job on it.

[Bigvinnie]

I'm pretty sure the KA is a NON-INTERFERENCE engine... here's a listing of Nissan motors and their configuration: (http://www.preferredcomponents.com/Nissan.htm).

The Z24I datsun/nissan engine was non interference. Had a severly raised hemispherical 8 valve head, the piston also has a crater top. The engine yields a 8.6:1CR. You can pretty much set cam placement anywhere without bending a valve.KA24e and DE's are interfernce engines either by raising the piston dish, or in the DE's case using a pentroof design head that shrinks cylinder volume and valve clearance.I have noticed that most if not the majority unleaded engines yielding higher compressions above 9.0:1 are usually interference engines using higher lift cams.

[Sleepy_Steve]

I Belive... that the LS* series motors are non-interferance. So i guess SOME 240s arnt interferance motors.

Behold the power of PUSH--RODS!!!!!!!!!!