 Which 2ltr do I keep?, Leak down test says keep them both!--Can't be right |
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| computers4kids |
 Dec 29 2006, 03:46 PM
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#1
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Love these little cars!  Group: Members Posts: 2,443 Joined: 11-June 05 From: Port Townsend, WA Member No.: 4,253 Region Association: None  |
Here's the deal...I have a 75 2ltr and a 76 2tr? I only need one...going to sell the other one. Both are FI. Supposedly the 76 was just rebuilt...actually I would call it freshened-up i.e. new rings.
I did a leak down test on the 76 and all cylinders were about 3-5 % leakage...OK, then I do the 75 and it has even less leakage..NO WAY...that can't be right. They both can't be in that good of shape...must be doing the test wrong. Am I doing this leak down correctly? 1) Bring piston to TDC 2) Air compressor is set to 100 PSI 3) throttle body open 4) Connect tester that has two guages 5) According to the directions I turn the knob cw (bottom of first gauge) until the guage on the right reads "0" (far right at end of yellow zone). 6) Leave at constant pressure and then watch the needle. Read the amount of leakage. Does the numbers on the gauge on the left mean anything? I know the motors are suppose to be warm, but I'm primarily looking for a differential between cylinders this should be OK test. Question 1: Am I doing the test correctly? Question 2: What else can I do to help decided which motor to keep? No need to post a picture of either motor (unless you want)..they look pretty much identical. I'm leaning toward the 75 just because it looks like it has never been touched...not knowing what kind of job the mechanic did on the 76. I need your advice! Attached image(s) 
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| Twystd1 |
Dec 29 2006, 11:47 PM
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You don't want to know... really..... Group: Members Posts: 2,514 Joined: 12-September 04 From: Newport Beach, California Member No.: 2,743 |
Do you have a stop watch???
Cause your gunna need one.... Time VS Pressure drop.. Go google and search HOW TOO use A Leak down tester. yada, yada... That will keep me from writing a whole article on the subject. As the results are to a degree... Subjective If the engine doesn't have a stock ring pack. And they are set up loose for a purpose, or the rings have no oil on them, or a seat/valve has a little piece of carbon on it. Again... you may get erroneous data. Google da crap out of it.... Cause a leak down test can do more thaqn most people think it can......... C C |
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| Teknon |
Dec 30 2006, 12:27 AM
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#3
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The more I learn the dumber i think I am Group: Members Posts: 357 Joined: 10-August 04 From: Denver, Colorado Member No.: 2,505 Region Association: Rocky Mountains |
QUOTE(computers4kids @ Dec 29 2006, 02:46 PM)  Here's the deal...I have a 75 2ltr and a 76 2tr? I only need one...going to sell the other one. If you've been around long enough you should know you shouldn't get rid of any of them. Thars gold in dem dare motors. (IMG:style_emoticons/default/drooley.gif) |
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| Hammy |
Dec 30 2006, 02:39 AM
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#4
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mr. Wonderful Group: Members Posts: 1,826 Joined: 20-October 04 From: Columbia, California Member No.: 2,978 Region Association: Northern California |
First time I've seen someone wanting to find something wrong with one of their engines (IMG:style_emoticons/default/laugh.gif)
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| Jake Raby |
Dec 30 2006, 10:06 PM
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#5
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Leakdown tests are a great way to judge and engine's integrity.. Unfortunately unless the engine is warm the results are generally not accurate..
Warm and @ TDC- thats the rule |
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| Allan |
Dec 31 2006, 10:49 AM
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#6
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Teenerless Weenie Group: Members Posts: 8,373 Joined: 5-July 04 From: Western Mesopotamia Member No.: 2,304 Region Association: Southern California |
I would figure out which one of them has the best chance of survival and use it but also keep the other until it proves itself...
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| StratPlayer |
Dec 31 2006, 12:46 PM
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#7
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StratPlayer Group: Members Posts: 3,278 Joined: 27-December 02 From: SLC, Utah Member No.: 27 Region Association: Rocky Mountains 
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Hell I'm in the process of building a spare engine for my teener.. I would keep both engines, the one not being used I would freshen it up and use it when the one in the car needs to be pulled and worked on. I'd keep it.
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| TheCabinetmaker |
Dec 31 2006, 02:24 PM
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#8
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
(IMG:style_emoticons/default/agree.gif) with Strat. Keep it. You'll need it someday. Back on the road in one day!!! (IMG:style_emoticons/default/beer3.gif)
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