New engine, tune issues

[EVIL]

Have the new engine running now.
I used a scan tool to get some readings and some numbers are way off.
FYI
Oil psi is at 75lbs even after running hot.
installed a new O2 sensor, Denso 234-1001

Here are the readings

O2 voltage is betwen 14-20 normal .45
O2 cross counts around 172 normal 10-20
IAC 118 - 150 normal 10-50


the following are good
BLM arouns 131 normal 118-138
TPS 42 normal .36-.44
MAF 008 normal 4-7
LV8 036 normal 30-40

I did initial break in using break in oil a few days ago and changed oil and filter using 1 quart of break in oil and 5 of ZR1 then ran it a few more times.
Oil looked good but i have not opened the filter yet.

Today i warmed it up and started to hear a slight knock.
Could the issues about be the cause of the knock?
God I hope so.

Any help will be appreciated.

D

 

[EVIL]

After further inspection, i let the car run for a while and the oil psi went down to 48 psi.
The knock appears to be coming from a lifter or two once the car is hot.

I'm using Morel roller lifters. I guess the noise is normal.

 

[dpasadena]

I have Morel lifters and they are very quiet. I am using the stock rockers so I have quite a few different size custom pushrods to insure I have the proper preload on all the lifters. Proper preload is necessary for a quiet valvetrain. A couple of your push rods might be a little short causing the noise

 

[EVIL]

i did allot of measuring to order the correct size rods that were within .030 of each other and set preload using adjustable harland sharp rockers.

i just realized that while the engine had 100% joe gibbs break in oil there was no noise and now eith one quart break in oil and 5 of the Valvoline racing oil it makes noise when hot.
Hmmm. mabye some ZDDP will help.

 

[EVIL]

It's hard to keep up with all these responses . . .

The car has a commander chip.
CS034BO5

i know it was originally set for 60lb injectors which is what i still have.

differences are 6776 turbo, ported heads, ported intake, 70mm TB, 212 212 roller instead of 206 206 flat, roller rockers

Anyone?

D

 

[ryan319]

So you have 48psi of hot oil pressure at idle at a noisy valve train? I don't think adding zddp will help either issue. What oil pump are you using?

Your iac is off the charts. Have you driven the car yet?

 

[EVIL]

the only reason i thought of adding zddp is because when it had pure break in oil it was quieter. today it didn't seem as loud. maybe i'm just panicking but it does make some noise.
the car has not been driven yet.

off to work now

thank you
D

 

[QUIP'6']

i have morels and they are a little noisy. runs great so i just let her rip. wow you better hold on with that setup.

 

[84BuickGNYorkPA]

That's a lot of oil pressure, but I'm betting once you run the car it will come down, there is a difference between deep engine knocking and valve train tapping/chatter. I broke my engine in right after verifying the iac was set correctly and all fluids where topped off, the radiator took a few minutes. Then I was off to the highway for some 3rd gear 10 psi boost jabs and let the motor pull itself down to idle, rings where seated at this point. Take a video of the engine at idle and post a link on here to youtube video.... just a thought.

Chuck

 

[wickedtt]

i did allot of measuring to order the correct size rods that were within .030 of each other and set preload using adjustable harland sharp rockers.

i just realized that while the engine had 100% joe gibbs break in oil there was no noise and now eith one quart break in oil and 5 of the Valvoline racing oil it makes noise when hot.
Hmmm. mabye some ZDDP will help.

Within .030 of each other, I never had to use different length push rods with adj. rockers.. What preload amount are you ending up with on each lifter?

 

[EVIL]

Let me clear it up a bit, pardon my lack of information. My push rod lenght, with adjustable push rods, were about .080 from the longest to the shortest rods, some weren't as bad. After doing some swapping around with lifters and rockers i managed to get them within .030 of each other or less. I then ordered pushrods that were .015 from shortest and from largest ( all push rods were 7.950 i believe) and then adjusted rockers until rods would not move up and down and then gave another half turn on the HS rockers.

I will take some video tomorrow but then i need to figure out how to upload video.

thank you
D

Within .030 of each other, I never had to use different length push rods with adj. rockers.. What preload amount are you ending up with on each lifter?

 

[EVIL]

I changed the IAC and adjusted it with the TPS in small increments the bad readings dropped down significantly.

O2 cross counts were 172 now 30 normal 10-20

IAC was 118 - 150 now 70 normal 10-50

Going to pull valve covers this weekend and re-check preloads.

D

 

[TurboDave]

I changed the IAC and adjusted it with the TPS in small increments the bad readings dropped down significantly.

O2 cross counts were 172 now 30 normal 10-20

IAC was 118 - 150 now 70 normal 10-50

Going to pull valve covers this weekend and re-check preloads.

D

You keep saying the normal O2 cross counts are 10-20. This is NOT correct. The O2 cross counts is a counter that should continuously be counting up from 0-255, and start over and continuously count, as long as you are in closed loop. If you're in open loop there will be NO counting and any value you see is useless.

 

[EVIL]

Dave, that is the info i read on gnttype.org.

it states that is the idle value.

If that is incorrect, what should i be looking for?

Thanks

D

 

[TurboDave]

As I said, it's a counter. If you're in closed loop, then it should be constantly counting. When it hits 255 it'll start over and so on. If you're in open loop (open loop idle chip like TT for example) then it will not be counting and it's value is useless.

 

[EVIL]

thanks for clearing that up. There is always something new to learn on here.

D

 

[EVIL]

After letting the car warm up to normal operating temps i put some CD2 oil detergent in and wouldn't you know it, the lifters quieted down to almost perfect.
Then, after letting it run for 20 minutes or so the ticking came back.

Any thoughts?

D

 

[Turbo-Archie]

I'm no expert but I think high oil pressure is a bad thing

Like, you should have another gauge in the back of the block to see what it is really doing.

Maybe you cut the flow to the dr side and those are making the noise?

..