Cam diagnostic part II :(

Post by **Florida240sx** » Mon Dec 11, 2006 5:10 pm

Vaccum at idle is 10-12 it holds idle pretty well at 1200ish rpm (IACV turned up)Absolutely no power up until 4000rpms. My car feels like it has 50hp. It barely moves. Then I hit 4000rpms and it hauls a55. Here's my pics of what I see. Skipped a tooth off the bottom chain?

Post by **gaehrings13** » Mon Dec 11, 2006 6:33 pm

To tell you the truth, it looks like you have both of them just one tooth too low. Both dots are suppose to be on the shiny parts of the chain. If you put the big gear on tdc and try putting the chain with the silver marks on the dots. Then put the tensioner and move the intake cam to close the slack.... That is exactly how I do it and I always get it right the first time. lol remember im the idiot with the wrong safc settings lol.

Trust me dude if you were closer to miami i would help you out in a heart beat , I know the damn timing chain is a pain lol ive done it one to many times.
Modified by gaehrings13 at 4:51 AM 12/12/2006

Post by **drftsilvia** » Mon Dec 11, 2006 6:37 pm

being only 17 i don't know TOO much about cams and timing yet however....

If i was in your situation, i would set the motor to TDC via timing marks on the harmonic balancer...then look at your cams and see how they look. Your cams should look like they do in the pictures above when the motor is at TDC on the crank (1st cylinder lobes facing away from eachother)

--Thanks ka-t.org!

Make sure the pin is set to TDC as shown. If your cams line up right and you still have this problem, then i have no clue what is happening with your engine. oh and if you already did this or your motor was set to TDC via Harmonic Balancer in the above pics just ignore this post!

Hope i helped some, sorry if not.
Modified by drftsilvia at 9:10 PM 12/11/2006

Post by **Florida240sx** » Mon Dec 11, 2006 6:37 pm

From the last pic it looks like it's just my exhaust is one to far past... Correct? So just turn exhaust cam one tooth?YES MY ENIGINE IS ON TDC. Checked my rotor as well, and it's perfect.

Post by **wild_maxx** » Mon Dec 11, 2006 6:40 pm

your TDC on the compression stroke correct?

Post by **Florida240sx** » Mon Dec 11, 2006 6:42 pm

This is what it looked like yesterday before touching anything

I rotated the intake cam one tooth counterclockwise....Now it's like this???????Exhaust cam is moved now instead of the intake like it was last night.

Post by **KATwo40** » Mon Dec 11, 2006 6:44 pm

Edit: Rotate the exhaust side counterclockwise one tooth.

Post by **Florida240sx** » Mon Dec 11, 2006 6:47 pm

Anybody got a pic of their cams front picture? Would exhaust off one tooth cause lose of vaccum?

Post by **gaehrings13** » Mon Dec 11, 2006 6:54 pm

okay look at the last pic you have posted, do exactly what katwo40 says move it back one tooth, and you got it dude.

you also sound like you are only running on 3 cylinders, is the idle really ****ty if it is maybe one of the injectors are messed up or something is up with your spark.

Post by **KATwo40** » Mon Dec 11, 2006 7:01 pm

I had my exhaust cam off one tooth. Symptoms were:

Lumpy idle.Poor vac. (around 10-12in.)No power before 4k rpm.

Post by **WDRacing** » Mon Dec 11, 2006 7:37 pm

Me to...except on my RB20, but same symptoms. Ur exhaust is definitly off...lol.

Post by **PapaSmurf2k3** » Tue Dec 12, 2006 4:31 am

Florida240sx wrote:Anybody got a pic of their cams front picture? Would exhaust off one tooth cause lose of vaccum?

This is all I have for right now, ill try to run home and post up better pics soon. please note, picture 1 is WRONG, the cams are in backwards, causing my valves to hit my cyl 4 piston, but the marks are correct. the marks should be at a 10 & 2 type formation. note that I have slack in the upper section of the chain, and that the marks would fall into a 10 and 2 formation when the intake cam is rotated CCW.

this picture is correct, but its not from the front. hope this helps a little bit.

Post by **PapaSmurf2k3** » Tue Dec 12, 2006 7:01 am

here ya go!

Post by **PapaSmurf2k3** » Tue Dec 12, 2006 7:07 am

well aparantly file attatchment isnt working, so just give me your email adress and ill email them to you.

Post by **1WheelWonder** » Tue Dec 12, 2006 10:21 am

Check my Cardomain (sig) I cant post pics from work, sorry.

Post by **Florida240sx** » Tue Dec 12, 2006 3:40 pm

Somehow the chain has jumped???? I rotated the engine probably 50 times and same result everytime. Chain is off compared to how it was last night. Cams are still opposite not cockeyed like before. Here's the new link of what it is now. zer...14933

Post by **sunnys14** » Wed Dec 13, 2006 12:26 pm

why dont u pull off the front cover and retime the complete upper chain like i said? takes only another 15 mins to do and it makes sure you have everything right.

Post by **sunnys14** » Wed Dec 13, 2006 12:27 pm

also it looks like your exhaust cam is off

Post by **nissanfanatic** » Wed Dec 13, 2006 12:52 pm

According to the new pic, exhaust cam is off one tooth..

Post by **Florida240sx** » Wed Dec 13, 2006 2:13 pm

Messed with it last night...Car wouldn't stay running. Even giving it gas it would die. Took the distributor off my other motor....Hopefully it's that now

Post by **DammitBobby** » Wed Dec 13, 2006 2:31 pm

Pull the distributor and advance it one tooth and try it again. If it is real easy to miss it by one tooth.

Post by **PapaSmurf2k3** » Wed Dec 13, 2006 2:40 pm

yeah the dizzy was a PITA and added an unnessesary amount of time to an already ****ty job

Post by **DammitBobby** » Wed Dec 13, 2006 2:44 pm

LOL, I was lucky car would not crank the first time. I pulled the dizzy and advanced it one tooth fired right up. I figured it was the dizzy since it was my first time at rebuilding the engine.

Dammit GET ER DONE!!!!

Post by **coolbone28** » Wed Dec 13, 2006 4:11 pm

i think both your cams are too low. You cant go by the dots and chain marks now. ill try and take a pic of my cams tomorrow if i have time. And if i can figure how to post them haha.

Post by **Florida240sx** » Sun Dec 17, 2006 3:59 pm

Car is a beast now. Tires break loose in 1st no matter what. Got to get that J30 diff in.Plans to get the diff in this week and short throw goes in tomorrow.Had to fight my distributor, it had a crack in it luckily I had my spare engine for the rescue and after 2 attempts finially got it on the correct tooth and fired right up.

Post by **DammitBobby** » Tue Dec 19, 2006 9:44 am

Your orginal problem was poor performance, low vacuum and what about your idle?

What is your vacuum reading now?

Post by **Florida240sx** » Tue Dec 19, 2006 7:05 pm

Originally I had perfect vaccum. Just nowhere near the power, and engine was choking itself out. Could no go to redline in 3rd+. Dyno showed peak torque at 4000rpms making 191ftlb and 161hp at 10psiAdjusted one cam to correct position. Rough idle and only 10-12 vaccum, car had absolutely no power down low but took off in the top end....Adjusted exhaust cam to correct location car didn't idle.....Replaced distributor...Car hauls like a bat of h3ll....and then some

Post by **sunnys14** » Wed Dec 20, 2006 1:50 am

so now everything is fine?

Post by **PapaSmurf2k3** » Wed Dec 20, 2006 11:06 am

hey florida (Justin, IIRC) did you ever get that email I sent you?

Post by **Florida240sx** » Wed Dec 20, 2006 1:26 pm

PapaSmurf2k3 wrote:hey florida (Justin, IIRC) did you ever get that email I sent you?

I think so....... and yes YRRC

Cam diagnostic part II :(

Cam diagnostic part II :(

Re: Cam diagnostic part II :( (Florida240sx)

Re: (Florida240sx)

Re: (wild_maxx)

Re: (Florida240sx)

Re: (PapaSmurf2k3)

Re: (PapaSmurf2k3)

Re: (Florida240sx)

Re: (DammitBobby)

Re: Cam diagnostic part II :( (Florida240sx)

Re: (Florida240sx)

Re: (sunnys14)

Re: (PapaSmurf2k3)

Nissan Forums

Infiniti Forums

Datsun Forums

Technical Forums

Classifieds / Marketplace

Nissan Motorsports

General Forums