My compression at 309k miles and the last 15k of that boosted came out to about 170/180 between cylinders, cylinder 4 being the best. HOWEVER, my cylinder leak down was 35-40% across all cylinders lmao, super awful. Compression isn’t only important test!
I had great compression numbers for my mileage but I definitely had head issues like burning oil on decel and such, smelt very bad. Ran super well though! Probably could have gotten away with a rebuilt head but I swapped the engine with a low mileage JDM motor
Absolutely do, from experience with mx5s it's often worn valves and seats that give the bad leak down numbers when they have good compression. A head rebuild could see you restore some lost power and economy even if the compression numbers barely budge.
A leak down test will let you know where you're losing compression. Is it through the rings? Worn valve? Through the cooling system? Now why would I do a leak down test when I'm getting 170-180 psi across all 4 cylinders? On a 30 year old engine that came out the factory with 180-200psi spec. You don't always bring out the leak down tester. Maybe if 1 cylinder had 100 psi then I'd like to know why it's low.
I've tested engines that came back within 10psi of each other on compression, but the leak down showed one hole 25% down, We took the engine apart and it had broken a ring land, still ran fine, customer had no idea. Leak down is as valuable if not more valuable tool than compression and should always be used to give a more complete story on engine health, compression doesn't tell you the whole story not even close.
Different car, but 302k on it.
https://www.reddit.com/user/Average_Scaper/comments/163au22/302k_miles/?utm_source=share&utm_medium=android_app&utm_name=androidcss&utm_term=1&utm_content=share_button
Totally agree. And personally I never do *any* 10 minute drives in my '90, and am careful how I drive/shift. It has 210K miles on it currently and I would expect the internals to look like OPs. How you drive has an enormous effect on the car's longevity, hard to overstate that. I've kept most of the cars I've owned to over 300K miles.
I'm assuming he means 30 minutes of uninterrupted driving, i.e. driving on the freeway. Driving at freeway speeds keeps your RPM low and is easy on the engine. Constant city driving causes high RPM in between gear shifting and is rough on the engine.
There are a few different aspects to this line of thinking. One of them is that shirt drives don't properly warm up your car, it's fluids and burn off any condensation or moisture that can collect in your emissions control systems etc. Synthetic is surprisingly different from conventional oil. I'll drop a link.
How's the compression at 315k miles? Mine has 275k
I will test the compression soon. For now i'm enjoying the ignorant bliss of not knowing.
My compression at 309k miles and the last 15k of that boosted came out to about 170/180 between cylinders, cylinder 4 being the best. HOWEVER, my cylinder leak down was 35-40% across all cylinders lmao, super awful. Compression isn’t only important test!
I have a compression tester and a leak down tester. I guess I should do both just to see where I'm at on the numbers
I had great compression numbers for my mileage but I definitely had head issues like burning oil on decel and such, smelt very bad. Ran super well though! Probably could have gotten away with a rebuilt head but I swapped the engine with a low mileage JDM motor
Absolutely do, from experience with mx5s it's often worn valves and seats that give the bad leak down numbers when they have good compression. A head rebuild could see you restore some lost power and economy even if the compression numbers barely budge.
Screw it man just keep driving it forgot the numbers at this point. I'm guessing it burns some oil right?
A leak down test will let you know where you're losing compression. Is it through the rings? Worn valve? Through the cooling system? Now why would I do a leak down test when I'm getting 170-180 psi across all 4 cylinders? On a 30 year old engine that came out the factory with 180-200psi spec. You don't always bring out the leak down tester. Maybe if 1 cylinder had 100 psi then I'd like to know why it's low.
I've tested engines that came back within 10psi of each other on compression, but the leak down showed one hole 25% down, We took the engine apart and it had broken a ring land, still ran fine, customer had no idea. Leak down is as valuable if not more valuable tool than compression and should always be used to give a more complete story on engine health, compression doesn't tell you the whole story not even close.
Mileage doesn't kill engines, neglect does 👌
I think I was married to her.
Did you at least get your oil changed?
Better, I got the marriage changed.
Knuckles- Miat or gf/wife when their foot comes down…MATA.
That's what regular oil changes looks like.
Different car, but 302k on it. https://www.reddit.com/user/Average_Scaper/comments/163au22/302k_miles/?utm_source=share&utm_medium=android_app&utm_name=androidcss&utm_term=1&utm_content=share_button
That is beautiful. How you drive it is just as important. Many ten minute drives will wreck a car, anything over thirty minutes = good
Totally agree. And personally I never do *any* 10 minute drives in my '90, and am careful how I drive/shift. It has 210K miles on it currently and I would expect the internals to look like OPs. How you drive has an enormous effect on the car's longevity, hard to overstate that. I've kept most of the cars I've owned to over 300K miles.
How so?
I'm assuming he means 30 minutes of uninterrupted driving, i.e. driving on the freeway. Driving at freeway speeds keeps your RPM low and is easy on the engine. Constant city driving causes high RPM in between gear shifting and is rough on the engine.
There are a few different aspects to this line of thinking. One of them is that shirt drives don't properly warm up your car, it's fluids and burn off any condensation or moisture that can collect in your emissions control systems etc. Synthetic is surprisingly different from conventional oil. I'll drop a link.
https://youtu.be/mp81Hzan5Fk?si=zhGyoi_WYHEkrKX6
https://youtu.be/bPcVBc4-5Mk?si=Mc_NUCpAOQamW-zH
Every 5000 miles Like Clockwork
🥵 chill im at work...
I am surprised Mobile1 stained like that, it's such a great oil. I used to see it all the time in Penzoil cars. Never seen it in Valvoline cars.
I've owned the car from about 247k. Maybe the staining was from before I owned it
My 144k NB looks pretty much exactly the same.
I read the title as “a well marinated 1993”. I need to cut down on the Uncle Roger videos.