HKS cams installed, bad vibration of the engine

[djsven]

Hi,

My car is a 95 eclipse GSX. I recently installed the HKS cams (264 in, 272 ex). I also swapped my throttle body with a 1G NT and installed greddy profec B spec 2 boost controller. These are the latest upgrades I made with my car. I finally finished the installs and tried to run the car. The engine is vibrating a lot. I am curious, if this is due because of the extra airflow created by the new more aggressive cams and I didn't adjust the SAFC. Or might there be something wrong. The car ran for 2x 5min. No strangs noises.

The other question is how to program the profec boostcontroller. The instructions are not as clear, because of the percentage adjustment instead of real boost pressure.

Thanks,


Sven

 

[burldude]

Check your cam timing again to make sure that it is right on . Check the vfaq on how to do it . And yes the Safc will need to be adjusted again and also your fuel trims are remapping which will lead to what you saying is happening .

 

[djsven]

Hi,

I didn't check the timing yet. I have a bad idle, fluctuating between 750 - 1050 rpms. I checked my safc and I reprogrammed the idle, but it was still doing it.
Any help would be appreciated. I need the car running fine before friday!
I forgot to mention this before, but I am still running stock springs and retainers.

thanks,


sven

 

[TSIfreek]

If you are still running balance shafts sounds like they are out of faze.

 

[djsven]

Hi,

I doubled checked the timing marks at TDC and they all line up. I remember when I replaced the timing belt that the balance shaft belt was replaced and aligned with the timing marks.

Sven

 

[TSIfreek]

Thats fine but the rear balance shaft has to be in faze with the oil pump. you need to check the rear balance shaft faze with the oil pump. The rear balance shaft runs off the oil pump un like the front one. Many guys make the same mistake. There is a bolt on the rear of the engine about 3-4 inches from the deck. remove this bolt and see if you can stick a screw driver in it 4inches when you have all the marks lined up . More than likely the rear is 90 degress off. Once the rear shaft is in fase the screw driver will go in and the marks will line up. Its hard to explain but you will get it once you see whats going on.
If you dont do this your balance shaft bearings will go out very quickly.

 

[TSIfreek]

If you didnt remove your BS belt and it was not doing this before than this is not your problem. I would look for vacume leaks.

 

[spoolamatic]

Sound like you have the balance shaft on the oil pump timmed wrong .
As the shaft is not in time just because the mark on the pump is lined up ,
because it turns at different speed than the oil pump belt pully .
You will need to take the plug on the side of the block were the shaft is to make sure the flat side of the shaft is down and the mark on the pump lines up. Should be in the VFAQ
Hope this helps .

 

[leet]

Sound like you have the balance shaft on the oil pump timmed wrong .
As the shaft is not in time just because the mark on the pump is lined up ,
because it turns at different speed than the oil pump belt pully .
You will need to take the plug on the side of the block were the shaft is to make sure the flat side of the shaft is down and the mark on the pump lines up. Should be in the VFAQ
Hope this helps .

You don't need to take any plugs out..

(taken from VFAQ due to my laziness):

Simply rotate the mark on the oil pump sprocket until it is pointing straight up, and let it go. If the sprocket rotates towards (counterclockwise) the timing mark on the engine, the oil pump sprocket is aligned correctly. If it rotates away (clockwise) from the mark, spin the sprocket a full turn and test again, and it should properly rotate towards the mark now. Now line the mark on the sprocket back up with the mark on the engine. This avoids having to remove the rear access bolt entirely.

 

[djsven]

Hi,

I believe we are getting off track. I didn't have any problems before with vibration of the engine until I changed my camshafts last weekend. I made sure everything was lined up and nothing touched or was able to change the balance shaft belt. In my knowlegde i would say that everything is fine with the alignment of the timing and balance shaft belt.

Sven

 

[leet]

You took the timing belt off, correct?

If so, more than likely your balance shaft is out of phase. It doesn't matter if the mark lines up on the oil pump sprocket, it has to be in PHASE. Do it again, using the procedure I supplied.

 

[djsven]

I had the timing belt tied to the camgears with zip ties. And of course those (the camgears) came off. And when the camgears were re-installed, the timing belt was still in the right stop, I started with.

 

[Lunch_Box]

You don't need to take any plugs out..

(taken from VFAQ due to my laziness):

Simply rotate the mark on the oil pump sprocket until it is pointing straight up, and let it go. If the sprocket rotates towards (counterclockwise) the timing mark on the engine, the oil pump sprocket is aligned correctly. If it rotates away (clockwise) from the mark, spin the sprocket a full turn and test again, and it should properly rotate towards the mark now. Now line the mark on the sprocket back up with the mark on the engine. This avoids having to remove the rear access bolt entirely.

Wish I would have known that I have always taken out that bolt to make sure.

 

[v2ner]

doesn't anybody think those camshafts are a little aggressive for the setup? i do. personally, i think the stock ones are good enough for the t28.

 

[v2ner]

BTW, i'm gettin 15-15.2 psi w/ these settings:
set: 33
gain: 43
set gain: 99

hope that helps.....but i got a diff. setup.

 

[leet]

doesn't anybody think those camshafts are a little aggressive for the setup? i do. personally, i think the stock ones are good enough for the t28.

I run HKS cams on my big28. No complaints whatsoever.

Pull from 4-7k is nice. Sure, its not a HUGE turbo, but I like the quicker spool-up.

 

[leet]

I had the timing belt tied to the camgears with zip ties. And of course those (the camgears) came off. And when the camgears were re-installed, the timing belt was still in the right stop, I started with.

More than likely your one of your cams is off by one tooth then.

I've had that happen to me, even when the marks line up.

Did you use a straight edge all the way across both gears to align the marks?

 

[dsmrunaway1]

Jus remember everyone at tdc every 2 rotations the crank lines up with cams but the oil pump is off and every 3 rotations the oil pump lines up with the crank but the cams are off 180 degrees from where they should be...so 6 rotations lines everything up perfect..jus did a timing belt got smart with it...good to know though latz.....

 

[loreak]

Can you describe the engine noise, because from what you said you didnt change any of your tbelt alignments cuz u used zip ties. So bshafts should be in phase, and you can only really hear them out of phase at 4k up. So is it alot of noise coming from your head, or just the engine in general, what rpm are you hearing it at. Describe it as best you can. If it is off a tooth or two, it can make your valvetrain get super loud, like every lifter is solid and i sounds very very bad.

 

[djsven]

Hi,

The sound comes just from the head. It is a knocking (nack, nack, nack...) sound at 1000 - 2000 rpm. But not always. It doesn't happen often that I hear that sound. I checked the timing belt and that is aligned perfectly fine.

sven

 

[loreak]

could is be a lifter? they can get quite loud sometimes and that can come and go, thats about the only thing it could be if its not constant

after finishing my motor my lifters tapped horribly loud for 40 miles, and yesterday they started making alot of noise for about 45 mins then went away.

 

[djsven]

Hi,

The noise is gone. I haven't noticed it again. The vibration is less. And taking to my friend about it. And he thinks the throttle body is causing the rpm changes and the vibration. BTW, I ran last saturday at the track and ran a 13.032 at 109. So, no problems so far!
Knock on wood!!!

Thanks for the replies,


Sven

 

[lowridin2g]

this happened to me when i did my cam install. what ended up happening was my oil pump sprocket was 360 degrees out of phase. the oil pump sprocket directly effects the rear balance shaft causing massivly looud engine vinration.