4 those that needed new motor
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Senior Member
Joined: Oct 1999
Posts: 276
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From: Cleveland, OH
4 those that needed new motor
I was wondering if you guys let the motor warm up before pushing it hard. Since I saw these post about the piston rattle before I even got mine I always have. Many of you already know I'm sure but incase you didn't forged pistons require larger piston to wall clearances than the normal hyperpathetic (the typo IS intentional). This is because the forged material has a greater rate of expansion than a cast or hyperpathetic. If you don't let a forged piston motor warm up before pushing it hard you run the risk of 'springing' the piston skirts. Does anyone know what the piston to wall clearance is in one of these? Typicaly superchared applications run even greater clearance since they develop more heat (and increase the risk of deforming the skirts at low temps).
Senior Member
Joined: Jun 1999
Posts: 1,487
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From: Oak Point, Texas
Yes.
Hyperpathetic?
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1999 Black Roush-Lowered Lightning - w/Super Chip (YEEEOW!), JBA Headers, F-1 Cobra hood, Power Surge air kit, CD Changer, Towing Package,Grey Rhino, clear corner lenses.
[This message has been edited by sixpipes (edited 12-03-1999).]
Hyperpathetic?
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1999 Black Roush-Lowered Lightning - w/Super Chip (YEEEOW!), JBA Headers, F-1 Cobra hood, Power Surge air kit, CD Changer, Towing Package,Grey Rhino, clear corner lenses.
[This message has been edited by sixpipes (edited 12-03-1999).]
Senior Member
Joined: Aug 1999
Posts: 5,438
Likes: 1
From: Palm Coast, FL
It's got nothing to do with that. The slap is caused by improper wrist pin location, causing the piston to "rock" in the bore twice per revolution. The truck did this since day one. My particular problem, was that it became a permanent noise 
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SAL
13.35@103mph
All stock with PSP 99 Lightning Chip and Filter Kit
Power Surge Performance--- Your SOURCE for SVT Lightning EFI Tuning and Performance!! http://members.aol.com/NLOCsvt/svt.html
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SAL
13.35@103mph
All stock with PSP 99 Lightning Chip and Filter Kit
Power Surge Performance--- Your SOURCE for SVT Lightning EFI Tuning and Performance!! http://members.aol.com/NLOCsvt/svt.html
Senior Member
Joined: Jul 1999
Posts: 3,367
Likes: 0
From: Illinois
Mine only makes the noise when cold. It does seem to be noisy longer. Maybe mine might eventually stay noisy all the time like Sals. We will see what Ford says next week. Its going to blow if they have to put an new engine in. Jeff
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99.5 red Lightning
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99.5 red Lightning
Member
Joined: Nov 1999
Posts: 11
Likes: 0
From: Austin,Tx.
SAL,
Do you , or anyone else, know if the piston slap has been corrected for the 2000 model Lightning? Is this a problem on all 5.4L Triton motors or just the SVT?
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Michael Gunterman
San Jose, CA.
hipo67gt@aol.com
Silver 2000 Lightning (on order)
1994 Bronco XLT, 6"lift
1968 Camero,327 4-speed
1967 Mustang GT, K-code coupe
1967 Mustang Fastback,351C 4-speed,14.6@94mph 1/4mi
1966 Mustang Coupe, 289 auto, 14.2@98mph 1/4 mi.
Do you , or anyone else, know if the piston slap has been corrected for the 2000 model Lightning? Is this a problem on all 5.4L Triton motors or just the SVT?
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Michael Gunterman
San Jose, CA.
hipo67gt@aol.com
Silver 2000 Lightning (on order)
1994 Bronco XLT, 6"lift
1968 Camero,327 4-speed
1967 Mustang GT, K-code coupe
1967 Mustang Fastback,351C 4-speed,14.6@94mph 1/4mi
1966 Mustang Coupe, 289 auto, 14.2@98mph 1/4 mi.