need help on recognizing stock cams from performance cams - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 03-29-2014 Thread Starter
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need help on recognizing stock cams from performance cams

Ok im doing a swap engine from the same year the car is but when I bought the 99 mustang gt the guys told me it has performance parts already installed but a few months ago I checked the compression through the cap where you put oil from and it was throwing air through the hole. So I went to get a new engine but thought what it has parts in the engine so I took the vavle cover off and realized it is pretty to tell if the cams are stock or performance cams so let me upload a pic of the cam installed on ghe head and you guyd can probably tell

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post #2 of 5 (permalink) Old 03-29-2014
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Did you get a new engine just because it was throwing oil out of the oil filler hole while the engine was running? If you are going to test compression on an engine, that is not how you do it. Compression is tested one cylinder at a time by removing the spark plug and hooking up the compression tester gauge and crank the engine. This step should be repeated for each cylinder. As for the fact that the engine blew some oil through the filler hole when running is not uncommon, although it should not be blowing oil out of there, in which case something would be very wrong.

I can't help you much with your question about the cams, but I believe most companies engrave their name or logo somewhere on the cam axle. Try rotating it and look for the engravings, they should be at one of the ends.


2003 Mustang GT
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post #3 of 5 (permalink) Old 04-02-2014 Thread Starter
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Sorry I took long to respond back but I dont have the tools to do the compression test on each cylinder and cant afford someone that will do it mechanics say that air is blowing out of the engine thruogh the oil filler it is defenitly the compression but could be the rings on the pistons as well and it will be cheaper to buy a used engine than rebuilding it but the reason I was asking about cams is to take them out before I trade the engine for the core in junkyard
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post #4 of 5 (permalink) Old 04-07-2014
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A little bit of oil being slung out of the oil fill hole is okay. If there is a "breeze" coming out of there, then you'll have what's called BLOWBY. Which is compressed air from the cylinders escaping into the engine. The more blowby, the worse your engine.
You can borrow a compression tester from your local auto parts store for free. Just screw it into each cylinder one by one and crank the engine to get a reading. Then compare. Pretty simple.

Nothing better than factory smooth...
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post #5 of 5 (permalink) Old 04-08-2014
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I would agree, a compression test is something that is needed before assuming the engine is bad....could be that you have a bad head gasket and with a new one your engine would be back to normal...

As far as performance cams...Look for engravings on the cams for the manufacturer. Other than that, I'm not too sure...

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