This is a very good explanation of both compression test and blow by test, probably the best I have watched. Looking at those plugs I think fuel problems is the most likely reason the car is running rough. Thank you for continuing to release videos during these strange times, I hope you and your family are safe and well.
Glad you liked it! And yes the issue now is fuel on the Weber carb for 3 and 4... That is another thing I need to sort out. Good observation and tip txs
Thank you for anouther great video . I wish good health for you and your family and loved ones. Here in California, the San Francisco area, we have been under a shelter in place for a long time, your videos are greatly appreciated, they help pass time.
This differential leak testing originated in testing piston aircraft engines where the consequences were very important. In Aviation the standard is the leakage pressure when 80 psig is applied. A reading over 70/80 (88%) is considered very good. For General Aviation piston engines compression leaks of 45/80 (56%) is considered a limit before conducting further investigation. Of course, where it is leaking (exhaust, intake or rings) will tell you a lot. Also, its important to use a Borescope to examine the cylinder walls and each of the valve faces and seats. Modern borescopes are very cheap and some have digital color camers. Look for uneven heating of the exhaust valves. ==Stay safe.
You're channel is very underrated, but I'm sure that sometime in the future will blow up (in a good way). I'm still surprise by that relatively high leak down on your cylinders, can you please do a compression and leak down test on the "old rusty" engine ? I saw that you took very much care in rebuilding that engine "by the book" and measured everything.
Really enjoyed your video, thank you for taking the time to share your experiences and knowledge. I hope one day to have a garage so I can work on my own project car!
Good video. You have a nice crop growing there; keep it going. One day hope to see you drive Rusty to pickup lumber and such as opposed to using your trailer.
Morning Steve. Great technical video 👍🏻 Loved the pinto engine back when I was messing with old ford cortinas lol 😂 We bought them very cheap £50 with knocking overhead cams hehe 😂 As you had too take the head off to fix them 😩 But we cut a hole in the bulkhead and drifted them out then drilled out the oil way job done ✅ Are you growing your beard for the Coronavirus 🤔 or just being a cool guy 😎 lol 😂 Thanks for the video as it's stared my week off perfect Cheers Stevie 😎🇬🇧
Thanks for the comments Stevie, yep those were the same engines. Very good engine and tuneable the Pinto. The beard is just laziness , I have been working from home the last 4 weeks... stay safe pal
Another thing I encountered using a leakage tester. If you are reusing your compression gauge hose, to be sure to remove the one way valve that most have.
TDC At Compression stroke Confirm - At 13:55 in your video where the cam lobes are at like, Exhaust lobe at like 2 o clock and Intake lobe at around 10 o clock, THAT"S compression stroke right, like your saying? # 1 and #2 Cam lobes would be aiming down at like 8 and and 4 o clock if on exhaust stroke. Im guessing.
Something else that can happen to an engine that has been sitting for many years, is that rust spots can form on the valve faces and seats. The longer the engine runs, the better the valve will seal.
Thanks for the comments, I will need to get to that in the coming days... the battery runs flat very quickly/// and with the charger on it stays up. that car is so f...up in terms of wiring
@@D3Sshooter another thing to try, put a jump lead from the engine to the negative battery terminal and to a good earth point on the frame/chassis if it improves its just a bad earth fault
If your compression test was good, why would the leak down test even be necessary? I suspect you have a fuel or ignition problem. You may could also shoot you temp gun at the same area on each cylinder to also determine the problem cylinders. Pulling the plug wires while running is also a good way of determining faulty cylinders........good luck.
Thanks for the comments, and good remark/// However a compression test is a very good indication but it does not tell you anything about the overall blow-by state of the segments/pistons. You can still get a good compression, as that piston moves fast, while you have a considerable amount of blow-by. In general you are right. Good compression is always a good indication, the leak test just gives you that extra on the actual wear on the motor. If the compression test is bad, then the leak test is for me the best tool to diagnose further. In this case, the engine had poor compression a few months ago when I got it , tested it after it had been sitting there for 15 years// To my own surprise , that compression is resolved after the engine had been running for a while. But it has other issues like the Weber carburettor on cyl 3 an 4. There is still a lot of work that needs to be done it.
This engine is fine, trust me (unless its burning oil, wich i dont see on the plugs). The leakage tester should be set with the Cylinder connected that has the best compression result. After that you can compare the other cylinders with the one that had the best compression. This engine has just a carb issue(s). This is my daily job, fixing exessive engine problems ;) Iam not critisizing just sharing some thoughts!
Thanks for the comments, I did move outside the video the pistons down and up the full stroke ( labor and compression checking possible better or worse blow by spots... That was about the same at any spot. Note that the carburators need indeed a checkout, especially cylinders 3-4 . However the engine does has pressure in the carter and that can be felt when removing the oil cap. So it has a certain level of blow by. But it will run like it , as you stated...its fine but IMO not optimum. Its a used engine...
@@D3Sshooter I think the truth is in the middle 🙂 when I see 12/13 bar compression on a petrol that's actual pretty awesome! Blowby is relative and might be acceptable. But when you can dye your hair with it it's too much hehe. Today's engines have even negative pressure! Like this channel alot, we got alot in common hehe alot know-how 👍👍
@@D3Sshooter How to you do away with the pvc valve?, on my pinto no smog needed the pcv grommet seal has a worn fit, have to black tape it to seal right as best i can
The direct method is the best - master. My diesel in 1992. .Greetings from Polish Łatwiej pisać w języku narodowym i wówczas można oddać tzw. subtelności języka / informacji. Osobiści (doświadczenie i wiek podobny), dzięki tym filmom mam możliwość przeżywać powtórnie poprzednie lata realizacji swoich marzeń - poza pracą zawodową w instytucie naukowym, a obecnie - „dziwna” Europa.
Thanks for the comments, I have tried all option here. I know that often works, and I am not even sure if its just a sticky clutch... IT might even be broken, so the last resort is to take the engine out
