My 87 gt. I did a doughnut or 2 and my engine started knocking. I parked it for 20 minutes while I was fighting with myself. Anyways when I started it the knock was gone. I have 40 psi of oil. It sounded like a upper end knock. What did I do?

Probably starved your oil pump for a second while the oil was at the other end of the pan. Thats why new Vettes use a dry sump system now.

It knocked for 20 plus seconds after I was done. I drove it to where I parked it. Then started it up later and it knocked for another 20 seconds then quit. How do I check to make sure I didn't blow my engine (again)

I dont know of any way really to tell, compression test may tell something. But time will tell more, just keep an ear on it and watch for smoke.

I'm guessing like my histroy #3 piston barring.
You will know if the knock comes back.

Check oil for metallic substance.

Don't say that sean. Shhhhhhhhhhh. Those words are not to be spoken. I hope not. This will be engine #5

Hopefully it doesnt come back, I've had what sounds like a knock on the drivers side since I bought the car with 39,900 miles, has 47k on it now and oil pressure is always at least 40 and while driving its 60-75, so I find it odd to for me to have a knock since the car was never beat

Check too that your oil level is where it should be. If it's low, it'll only aggravate the starvation around turns.

before to much possible damage is done: remove the oil pan and LOOK
I have saved myself a crank regrind by catching a freshly wrecked bearing. in my case, the bearing didnt spin - it just was HEAVILY worn. I was able to remove the bad bearing, polish the crank with 800+ grit sandpaper, and reinstall a new bearing. was perfectly fine for over 2 years, when I rebuilt the engine, due to cam/lifter failure. when I went back to check that bearing I replaced - it was fine, and would go for more.

anyways - as mentioned - it was likely oil starvation, due to the oil being pushed against the wall of the oil pan.
if it knocked - damage was done. thats what a knock is - the sounds of damage.

You sure it was a rod knock. You might have just collapsed a lifter or two, then they refilled. Ive seen where oil pressure will drop to 0 just taking a freeway exit fast with 1 qt low. Always keep oil full. I even use larger than normal oil filter for extra safety.

Rear wheel drive oil pan on FWD engine, oil takes longer to return from left turn than a right one. See FWD oil pan makes no sense What gives thread posted today for discussion

quote Originally posted by 87antuzzi: Don't say that sean. Shhhhhhhhhhh. Those words are not to be spoken. I hope not. This will be engine #5

What do you DO to your cars?

Do you have working gauges?
Do you USE them?

quote Originally posted by Scoobysruvenge: See FWD oil pan makes no sense What gives thread posted today for discussion

...

Geez, talking about making "no sense".

Patty,

This is a subject that I have thrown around for years, much like the unfortunate soul who started this thread I was also given to severely mistreating automobiles in my youth as well.
I too noticed the phenomenon of oil starvation to the sump on transverse engines and have posted some conjecture on the subject found here on PFF at

https://www.fiero.nl/forum/Forum2/HTML/105965.html

Well that makes more sense.

Honestly, the sentence(?) that I quoted just seemed like a random assortment of words.

quote Originally posted by Scoobysruvenge: See FWD oil pan makes no sense What gives thread posted today for discussion

Sorry for the confusion, but it seems to be the only way I can operate. Geez Patty 10 years here on PFF I guess you were young once too.

quote Originally posted by Scoobysruvenge: Geez Patty 10 years here on PFF I guess you were young once too.

Seriously, I've got to ask.... Are you suggesting my complaint with the way you worded that particular sentence is based on the fact that I'm no longer "young" (whatever that may be)? If so, I've just got to say you are oh so wrong.

If you wish for people to listen to what you have to say, it needs to said in a manner that people, of any age, will understand. Otherwise it's all a wasted effort, which in many cases, is a real shame.

It just seems that the education system put more energy in years past teaching students how to communicate properly (ie spelling, grammar). I don't know what they focus on now.

My z34 used to clack like crazy after a good long sprint, I was told by other 3.4 DOHC nuts that this is normal, It never caused any problems.

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2008 Kawasaki Z1000.
2006 Subaru B9 Tribeca.
1996 Subaru Impreza L-T -201 awhp 213 awtq- 200+k miles. Stock internals. 60 trim turbo.
1984 Pontiac Fiero 2M4.
1981 Oldsmobile Cutlass. 307
1980 Oldsmobile Cutlass. 455

Bottom end Engine knock's NEVER, EVER go away without intervention. So I don't think you have anything to worry about. You probably made one of your lifters angry, and its probably ok now.

And, Yes 3.4 DOHC's have lifter problems worse then any other motor I've ever seen. They tick and clack like crazy when abused. Putting in good oil solves that problem. I run Royal Purple 10W-30, and It has done what no other oil can do. Make my 3.4 DOHC happy and quiet.

No problems you know of yet. Any time a real low oil knock is heard severe damage is being done to two pieces metal that have no oil between them.
I know that some early 2.8 engines had a slightly narrower rod and would knock side to side until the engine warmed up, this side play was determined to have no ill effect on the engine, but were recalled by GM anyway due to customer complaints.

quote got a engine knock after i did a doughnut

Try a bagel next time.

Actually, it does sound like maybe your oil was low and you starved it for too long. If the knock comes back, you probably have some permanent damage.

Jim

quote Originally posted by jimbolaya: Try a bagel next time.

dang! beat me to it by one post. :\

lol

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"Be not led astray, bretheren beloved..." -James 1:16.


Thanks, Danyel, for the graphic.

quote Originally posted by Scoobysruvenge: Nope Patty, Just noticed you had been a member for 10+ years, geez you sure are a crotchy old fart. Just kidding pops...

Please refrain from commenting on my crotch, kid. Thank-you.

quote Scoobysruvenge:Rear wheel drive oil pan on FWD engine, oil takes longer to return from left turn than a right one. See FWD oil pan makes no sense What gives thread posted today for discussion

I must agree with Patrick on that last sentence.

Engage brain prior to keyboarding.

Key concept: PROOF READING.

You need to stop doing this sh*t with your car kris

[This message has been edited by pontiackid86 (edited 01-21-2010).]

i think its Pontiackids fault!

There's a big difference between rod knock and valve rattle. Valve rattle doesn't necessarily mean your engine is toast, but rod knock usually does.

Rod knock sounds like someone is whacking on the side of your engine with a hammer. And valve rattle sounds sort of like a diesel engine.

This is engine number 4. RIP
http://m.youtube.com/watch?...=CA&client=mv-google

Yeah, that's a rod knock. You may be able to rebuild it. But definitely don't run it any more. If it decides to toss a rod, it can damage more than just the engine.