JWT CAMS INSTALL GONE WRONG

[crazys14mexican]

Last week me and my buddy installed some JWT cams on his 96 240sx and he finally got about 75 miles on them so he tried getting on it today and he said that it felt slower than with the stock cams (232/232 setup). Well today we took the valve cover off again and we set it to TDC. So we go driving around again and it ran like it was bouncing off the rev limiter between 5300rpms and it doesnt feel like any pull @ all. I did some searching on here but i didnt get much luck besides somethings about adjusting the timing. Ive messed with the timing a bit but no luck, can anyone think of anything it could be?? This is driving me nuts and i dont know why the power would just stop and it would feel like its hittin the rev limiter......any help would be great!

[Touchdown038]

As long as you lined them up straight when you put them in, the only thing I can think of is that the chain slipped while you had the cams out.

Did you align the silver links with the marks on the cams?

[crazys14mexican]

well he marked the chain before we took the stock ones out...im not sure id have to talk the valve cover off again and take a look... could it be detonation? he's still running 87 gas and its about 45-50 today....it only does this in the high rpm range+wot

[Ubernoober]

Dirty MAF?

[2_Liter_Turbo]

Try taking out the cams, rotate the engine to top dead center again and again untill you see the 2 silver links on the upper timing chain. Then re-install the cams aligning the notches with the silver links. Then make sure your timing is correct and try running it again. Also, make sure you didn't accidently put the JWT cams in backwards (a.k.a. the intake cam on the exhaust side ect ect.). I've never seen their cams so I don't know if they mark them very well. Hope this helps.

[2_Liter_Turbo]

Now come to think about it, you can just rotate the engine without the cover on untill the 2 silver links are on top and see if the notches on the ends of the cams line up. If they are on, then that's not your problem; if they are off, well you have a relatively easy fix. Good luck!

[crazys14mexican]

thanks i will hit it up tommorow or monday........

[crazys14mexican]

bump

[crzycav86]

Now come to think about it, you can just rotate the engine without the cover on untill the 2 silver links are on top and see if the notches on the ends of the cams line up. If they are on, then that's not your problem; if they are off, well you have a relatively easy fix. Good luck!

The colored links won't match up with the marks of the sprocket until you turn it a number of times up to (# of teeth on the gears * # of links on the chain). It's a pretty common misconception that the colored chain links will match up with the marked teeth for every revolution.

In order to properly install cams, you have to remove the top and bottom timing chain covers, and align the colored links to the marked teeth on both the crank sprocket, idler sprocket, and the cam sprockets.

It's not an easy task, I'll give you that much. Good luck.

[amolao]

You are very right on that, I learn it after I had to recheck my new timing chain install......the links will match the markings on the right revolution after like 50 turns by hand....#$%*!!, you are better off taking the chain off and reinstalling it on the right markings and settings....

The colored links won't match up with the marks of the sprocket until you turn it a number of times up to (# of teeth on the gears * # of links on the chain). It's a pretty common misconception that the colored chain links will match up with the marked teeth for every revolution.

In order to properly install cams, you have to remove the top and bottom timing chain covers, and align the colored links to the marked teeth on both the crank sprocket, idler sprocket, and the cam sprockets.

It's not an easy task, I'll give you that much. Good luck.

u

[crazys14mexican]

so basically we need to start from scratch all over again huh?

[crazys14mexican]

so has anyone here put in jwt cams in there KA24de?

[koukiKA240]

I did last weekend, all i can say is FACTORY SERVICE MANUEL. I just followed the instructions.

Cliff notes:Tighten down from the outside in in 2 stages and i think the final tourqe spec is like 8.5 lbs.

Make sure the cams are on the correct side, it should say on the JWT website how to tell. Make sure that when tightening down the cams that it is opening the middle valves not the outside ones, if it does this will fk ur valves.

When you get them tightended down, turn the motor with a wrench on the crank pully to TDC, do this with the upper timing chain not connected.

Once the motor is at TDC look for the timing marks on the chain and the idler sprocket. Line up the mark on the sprocket with the mark on the chain, from here take the sprockets and place them lined up with the timing marks NOT ON THE CAMS yet. Once u get the cam sprockets lined up with the timing marks and the idle sprocket on the bottom timing mark then push the sprockets onto the cams. And fasten with bolts.

If it still runs like crap then make sure the cams are not laid 180 out, or the dist isnt set up 180 out.

And i just thought of something, when i was having problems figuring out why my car wouldnt start i took my valve cover off of my motor to check cam timing, and cranked it to watch the cams, my gf took video of this. If you think it will help you identify cam timing, IM me at KoukiKA240sx on AIM or email me At [email protected] and ill send the video ur way. I hope this helps,~Sam

[crazys14mexican]

ok they are finally installed properlly i just havent had a chance to post on it.....does anyone suggest a certain timing for these? Anything will help

[URM S14]

koukika and crazymex- how do the cams feel compared to stock?

[slipnfall]

Tighten down from the outside in in 2 stages and i think the final tourqe spec is like 8.5 lbs. -snip- When you get them tightended down, turn the motor with a wrench on the crank pully to TDC, do this with the upper timing chain not connected.

BIG FAT NOTE: with cams installed, and *either* chain NOT installed, turning crank can result in valve/piston interference!

Maybe I'm misunderstanding your post, but I don't want someone reading this, who hasn't done it, to fudge their valves.

-Slip

[crazys14mexican]

actually our motors are non-interference .........and this blows my buddy's now throwing a cel light for #11 crank angle circuit...which would be cause of the cams..i think

[DarkStar]

JWT insists that you use their adjustable timing gears with the cams for it to run properly. I have both and you see a huge boost of power in the upper range 4k - redline. I have mine set to stock timing and it revs faster and harder. Check with JWT and see what they say.

[Touchdown038]

I dunno about the DE, but I'm sure as hell that the E is an intereference motor, and was under the impression that the DE is also...

[EstoMax]

from what ive read when i was doing cams i was told DE is interference but it wont have a problem if ur only 1 notch off on the chain.. if your off more then it will have contact

max

[:: orion ::]

actually our motors are non-interference ...

No, no, no...

The KA24DE is an INTERFERENCE MOTOR. Don't confuse the newbs...

Quote »......and this blows my buddy's now throwing a cel light for #11 crank angle circuit...which would be cause of the cams..i think[/quote]No, that's b/c of the distributor...did he try to start it with the distributor disconnected at some point?

Does the car fine otherwise?

And it's NOT related to the cam...a bunch of guys, myself included, run JWT cams with ZERO issues.

As for their cams gear being needed...not for N/A...they are indexed correctly for N/A. They are beneficial for turbo, but also not necessary. My KA-T does fine with JWT cams and stock gears (make great power, too).

- Brian