nismo n9ne

Hey everyone as the title says im having a bit of an issue. i drive an 06 Evo 9RS i went to CBRD to get a tune on jan.15th last saturday. chad did what he did leak down check all that good stuff an took me on a saturday not to mention. but anyways he hooks it up to the dyno an pulls a couple times. he comes an gets me an shows me the knock count its high very high. i one point we got 36 counts of knock the engine was pulling timing but was not knocking from what i could hear at all. it was during small load, medium load an even free rev. im going to pull the knock sensor out replace it an put it back with factory torque specs. then i plan on pulling the valve cover to see if anything else is going on with the valve train. just wanted to see if anyone else has had the same or similar problem. mods are as fallowed thanks for any an all advice.

crower 272 (stock springs/retainers)
walbro 255
arp head studs
cosworth head gasket.

(only ones that may play a part)



Thanks, nick

EVOMIZ

iTrader: (11)

bump for an answer

achilles3000

iTrader: (1)

Post a log!

JohnBradley

iTrader: (30)

36 counts on a free rev can be a few things-

Balance shaft out of phase or delete without making changes in the knock tables.

Bad rod bearings

Clutch rattle

Mechanical rattle (exhaust, bolts, valvetrain, etc.)

Any of these symptoms seem to fit?

aaron

nismo n9ne

Thanks for the info man I'll look over all of those

CBRD

iTrader: (60)

Aaron,

I suggested:

pull the valve cover to check for a broken valve spring or valve train issue

cut the oil filter to check for bearing material

pull front 14mm hex head and slide in screw driver to check balance shaft

check knock sensor...


___________

There is more to the story..

as when the car was purchased it had a second knock sensor zip tied to the one that was installed in the block..

obviously the previous owner was having issues... and with 10,000 miles or so on it??? when it was purchased used? I'd say he dumped it because he couldnt fix it himself..

so now everything needs to be Very carefully looked at to see what is causing it!

the octane level was at 80% when went to calibrate the rpm on the dyno!!

cb

CBRD

iTrader: (60)

Also,

Nick, when you were here you had told me that the car had Brian Crower Springs and retainers.... I see that it says stock above!! just trying to clarify!

cb

achilles3000

iTrader: (1)

Looks like stock valve train knock..Stocker's hate upgraded cams,

MR. EVO MR

iTrader: (9)

did you check and make sure the knock sensor is tight?

nismo n9ne

no sir maybe you misherd i said stock springs an jus crower cams 272s sorry for the confusion i poped off the valve cover everything is normal under there. so on to cutting the filter.. a new knock sensor is on the way

nismo n9ne

and thanks chad for chimming in with more info for everyone

evl08

iTrader: (2)

Are you getting the 36 counts of knock at a particular rpm or is it anywhere and everywhere?

If I free rev from idle I regularly get high counts of knock starting at about 2.5k, I also get high knock counts with low load partial throttle from 2.5k to just over 3k rpm, normally when transitioning into positive boost pressure, but from about 3.5k rpm get no knock at all. Timing/fuel changes don't seem to make any difference.

Previously, I had some Tomei procams, and was getting knock in the same rpm areas, although it was normally below a 10 count so I swapped them out. Now I'm running GSC S1's, and Supertech beehive springs and hit high 20's.

JohnBradley

iTrader: (30)

Could be valvefloat or flutter as well. The BCs should be pretty easy on stock springs but eventually any aftermarket cam is going to start sagging them out. Even a lifter can make phantom knock if they are a little loud. Cam timing has been verified to be correct?

nismo n9ne

any where an everywhere man

nismo n9ne

yea all timming is correct. an ya i know after awhile... but cars been running cams for about 15k miles thank thats long enough to cause sagging?


THANKS for the help everyone