valvetrain noise?
07-16-2011, 04:43 PM
#1
10 Second Club
Thread Starter
valvetrain noise? My heads cam car has a pretty noticeable amount more valvetrain noise on cold start up then after its been started. Is this normal for a cammed car? I'm afraid my pushrods may be the wrong length. I'm running a ported and shimed ls6 pump and 5w-30 pennzoil platinum. It was probably 75 or so outside when i noticed it. It only does it for 2 seconds and then it gets quieter.
07-16-2011, 05:38 PM
#3
TECH Fanatic
It will just be the time it takes to get the oil pressure up & oil to valve train, you say it's only a couple of seconds, i wouldn't worry about it. Even as your oil gets older your valve train will show more noise, change out your oil & all will quieten down.
07-16-2011, 11:01 PM
#4
10 Second Club
Thread Starter
The oil probably doesn't have 1000 miles on it. And you only notice it inside the car with the radio, a/c, everything off and you start it you hear more "sewing machine" noise. I was afraid maybe i had to long of pushrod and it was keeping pressure on the lifters and causing them to leak off.
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07-17-2011, 07:52 AM
#8
Agreed more specific info on the cam and pushrod measurement data are needed.
Also need to know what oil filter you are using.
I would point out that my neighbor's '02 LS6 (no engine mods) developed a lifter tick at hot idle using Mobil-1 5W-30 this year, which we cured by switching to Mobil-1 0W-40.
The current API spec which Mobil, Pennzoil, etc. adhere to has very little zinc and phosphorous, whereas 0W-40 has ~200ppm more of each. It's also slightly thicker, which may be playing a role in quieting down the lifters.
When the weather turns colder, he'll be using Mobil-1 High Mileage 5W-30 which also has more zinc/phos.
Also need to know what oil filter you are using.
I would point out that my neighbor's '02 LS6 (no engine mods) developed a lifter tick at hot idle using Mobil-1 5W-30 this year, which we cured by switching to Mobil-1 0W-40.
The current API spec which Mobil, Pennzoil, etc. adhere to has very little zinc and phosphorous, whereas 0W-40 has ~200ppm more of each. It's also slightly thicker, which may be playing a role in quieting down the lifters.
When the weather turns colder, he'll be using Mobil-1 High Mileage 5W-30 which also has more zinc/phos.
07-17-2011, 10:53 AM
#9
Agreed more specific info on the cam and pushrod measurement data are needed.
Also need to know what oil filter you are using.
I would point out that my neighbor's '02 LS6 (no engine mods) developed a lifter tick at hot idle using Mobil-1 5W-30 this year, which we cured by switching to Mobil-1 0W-40.
The current API spec which Mobil, Pennzoil, etc. adhere to has very little zinc and phosphorous, whereas 0W-40 has ~200ppm more of each. It's also slightly thicker, which may be playing a role in quieting down the lifters.
When the weather turns colder, he'll be using Mobil-1 High Mileage 5W-30 which also has more zinc/phos.
Also need to know what oil filter you are using.
I would point out that my neighbor's '02 LS6 (no engine mods) developed a lifter tick at hot idle using Mobil-1 5W-30 this year, which we cured by switching to Mobil-1 0W-40.
The current API spec which Mobil, Pennzoil, etc. adhere to has very little zinc and phosphorous, whereas 0W-40 has ~200ppm more of each. It's also slightly thicker, which may be playing a role in quieting down the lifters.
When the weather turns colder, he'll be using Mobil-1 High Mileage 5W-30 which also has more zinc/phos.
07-17-2011, 12:51 PM
#10
10 Second Club
Thread Starter
Its PRC 215s 60cc, MS4, 7.450 pushrods. A friend did the install for me and he kept getting a shorter meausurement so i got online and looked at what other people ended up with for the same combo and i just ordered them. I know that was stupid thing to do but it happened. I'm running stock rockers. I'm about to take it and have a FAST and tune done and while its in the shop im just gonna get them to check the length just so i can sleep better at night. 
07-17-2011, 01:48 PM
#12
Nothing likely wrong w/ that filter, they're basically OK.
Sounds like pushrod length issue as you're describing it...the pushrods look way long. What measurement did your friend get?
"Measure twice, assemble once."
Sounds like pushrod length issue as you're describing it...the pushrods look way long. What measurement did your friend get?
"Measure twice, assemble once."
07-17-2011, 05:47 PM
#13
10 Second Club
Thread Starter
He ended up with like a 7.35 or something he ran it with the stock length rods and he said after puttin in the 7.450 rods the valvetrain got quieter. I've got a pushord checker at his house but i wonder if i could buy one at a local parts store and i can just measure it myself before i take it to have the intake and a tune done in mooresville.
