Broken pistons? And replacement?? - Mustang Evolution

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Old 11-01-2014, 10:35 AM   #1
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Broken pistons? And replacement??

Lately there's been a rattling noise under my hood, the engine sounds louder than normal and it'll idle high sometimes. I've had to turn the idle down twice now. At first I thought it was an oil problem because when I put oil in it, the noise stopped for a couple weeks, now it's back again. Asked a friend who rly doesn't know much about cars but since the sound is coming from what seems like inside the engine, pistons maybe wasn't a bad analysis. So could this be a bad piston and if it is how do I fix it??


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Old 11-01-2014, 01:17 PM   #2
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The car would barley run or run like hell if it were a piston.sounds like a valve is chattering or maybe a pushrods.has it started smoking since the noise?


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Old 11-01-2014, 02:13 PM   #3
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No not smoking abnormally, the normal smoke in the morning when it's cold that's it. It does need new valve springs tho u think that could be it?


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Old 11-01-2014, 03:39 PM   #4
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Yes I would say your hearing a valve chattering.i would replace the springs


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Old 11-01-2014, 03:43 PM   #5
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Any tips on how to do that?


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Old 11-02-2014, 05:29 PM   #6
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If you haven't had your hands inside a motor I wouldn't start on valve springs.check around to find a good mechanic.


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Old 11-02-2014, 05:49 PM   #7
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Nope never on the inside of the motor itself I've been learning as I go


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Old 11-02-2014, 05:51 PM   #8
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The best way to learn is hands on but I would have someone who knows how to replace them with you while your doing it.would hate to see you go through all the work to have to take it back apart.


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Old 11-02-2014, 05:55 PM   #9
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Heard. I've got a couple guys I can have help out. Ill also have to order more springs any recommendations? Sry about all the questions too.


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Old 11-02-2014, 06:48 PM   #10
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Ford racing makes good springs and also comp cams.around $40 for a set


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Old 11-02-2014, 06:58 PM   #11
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Quote:
Originally Posted by Liebert91stang View Post
Ford racing makes good springs and also comp cams.around $40 for a set


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I would also change valve seals while you have it apart.will need head gaskets as well.


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Old 11-02-2014, 08:22 PM   #12
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Ok thanks. Will post results in couple weeks


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Old 11-02-2014, 08:44 PM   #13
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How do you know you need new springs?

What mods do you have?
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Old 11-03-2014, 01:49 PM   #14
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When I bought the car guy said it needed new springs. Mods: it's a 91' roll block 30 over,10.5 flat top pistons,e303 Motorsport cams, roller lifters, rocker arms,edel alumi intake,750 Holley carb 4 barrel( currently using 2), gt40p heads, and 3.73 gears. Little misc stuff I got the high torque mini starter, msd ignition box. Guy told me when I got the car it needed new valve springs and a couple of trim pieces for my trunk


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Old 11-04-2014, 07:46 AM   #15
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Could be a Broken Spring, Broken Roller Rocker, Roller Rocker not lined up right on the end of the Valve Stem, maybe a bent Push Rod.
If you change Valve Springs you'll need to buy a Valve Spring Compressor which is $8 @ Harbor Freight. I believe you have to blow air through the Spark Plug Hole to keep the Valve from falling while you're changing each spring.
There's some good Video's on U-Tube that will show you how to do it.
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Old 11-04-2014, 08:48 AM   #16
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Well if those are the stock springs in those heads then hell yeah you need new springs. They will float way before 5k.


750 carb is way too big.


Here is a good little website to read.....


Five.Oh Info : The Ultimate Ford GT40 and GT40P Cylinder Head FAQ
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Old 11-04-2014, 12:35 PM   #17
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Yea I kno the 750 is too big I've had zero luck on finding 650


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Old 11-04-2014, 01:17 PM   #18
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A good working 600 to 650 is good enough for mild builds. Got get the tune spot on tho.


Edelbrock, Holley, Avenger, Demon......
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