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» Northern California Ford Owners     » Automotive   » Tech Talk   » bad piston compression

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Author Topic: bad piston compression
IvanFive0
built for twisties
Member # 5574

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so i did a compression test on my 5.0 and four pistons came back with low compression..the car is supercharged. i think rod's and pistons are forged but not sure. do i need to rebuilt the motor???

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2012 Coyote - Daily
91 Coupe - HCI turbo
88 Mclaren - Griggs, T56, S trim, B50
87 Coupe

Posts: 883 | From: At the apex, passing you! | Registered: Apr 2005  |  :
E's 89COUPE
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Member # 6569

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I BET YOUR HEAD GASKET ARE GONE CHECK IF THERE'S ANY WATER LEAKING INTO THE CYLINDERS

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SIDE JOBS PERFORMANCE & GENERAL MECHANIC 510-875-0502 EDDIE

2005 F150
89.LX COUPE
68.Cougar
89 civic HB

Posts: 1432 | From: BAY AREA | Registered: Feb 2006  |  :
IvanFive0
built for twisties
Member # 5574

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i checked that already looks good...

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2012 Coyote - Daily
91 Coupe - HCI turbo
88 Mclaren - Griggs, T56, S trim, B50
87 Coupe

Posts: 883 | From: At the apex, passing you! | Registered: Apr 2005  |  :
TOPnotch
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Member # 1340

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5.0 + supercharger most likely a bad tune or no tune at all. Yeah sounds like a head gasket problem. Need more info on the car to help you out. Does the car run rough, is it down on power, run hot, use water?

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The bitterness of poor quality remains long after the sweetness of low price is forgoten!!!

1QWKCHP
1QWKDRP

Posts: 2255 | From: Hayward | Registered: May 2002  |  :
IvanFive0
built for twisties
Member # 5574

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yeah the car run's like shit. their is no power.. think it might need a tune but i don't think that is going to help the low compression....

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2012 Coyote - Daily
91 Coupe - HCI turbo
88 Mclaren - Griggs, T56, S trim, B50
87 Coupe

Posts: 883 | From: At the apex, passing you! | Registered: Apr 2005  |  :
smashin 5.0
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Member # 8301

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time for a rebuild
Posts: 23 | From: Daly City | Registered: Mar 2008  |  :
91CHP_Coupe
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Member # 7686

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check the head gasket first because you said its only four on one side....

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69 Mach 1
91 Coupe HCI. SOLD
04 DSG Mach 1

Posts: 253 | From: Richmond | Registered: May 2007  |  :


 
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