my garage...56K **pulled a piston**
12-01-2004, 07:41 PM
#101
1.5 BAR
Join Date: Aug 2003
Posts: 1,194
Re:my garage...56K **pulled a piston**
Better have more than less piston to wall clearance. Too little and the pistons will scrape the cylinders if they expand too much.
Engines with forged pistons tend to have more piston to wall clearance than engines with cast pistons, because they expand more.
On my engine you can in fact see the rings and jiggle the pistons around a bit, it has piston slap but when the engine warms up it goes away. Yet another reason why you shouldn't push it when the engine is cold.
Engines with forged pistons tend to have more piston to wall clearance than engines with cast pistons, because they expand more.
On my engine you can in fact see the rings and jiggle the pistons around a bit, it has piston slap but when the engine warms up it goes away. Yet another reason why you shouldn't push it when the engine is cold.
12-01-2004, 07:44 PM
#102
0.0 BAR
Thread Starter
Join Date: Apr 2004
Posts: 0
Re:my garage...56K **pulled a piston**
Originally Posted by baldur
Better have more than less piston to wall clearance. Too little and the pistons will scrape the cylinders if they expand too much.
Engines with forged pistons tend to have more piston to wall clearance than engines with cast pistons, because they expand more.
On my engine you can in fact see the rings and jiggle the pistons around a bit, it has piston slap but when the engine warms up it goes away. Yet another reason why you shouldn't push it when the engine is cold.
Engines with forged pistons tend to have more piston to wall clearance than engines with cast pistons, because they expand more.
On my engine you can in fact see the rings and jiggle the pistons around a bit, it has piston slap but when the engine warms up it goes away. Yet another reason why you shouldn't push it when the engine is cold.
I just called my uncle told me the same thing. -the one ive worked on alot of v-8 motors with. he also said that forged pistons expand.
a little gap is ok. thats an old "speed secret"
12-01-2004, 07:49 PM
#104
3.0 BAR
Join Date: May 2003
Posts: 6,279
Re:my garage...56K **pulled a piston**
Originally Posted by sccaeg
Originally Posted by baldur
Better have more than less piston to wall clearance. Too little and the pistons will scrape the cylinders if they expand too much.
Engines with forged pistons tend to have more piston to wall clearance than engines with cast pistons, because they expand more.
On my engine you can in fact see the rings and jiggle the pistons around a bit, it has piston slap but when the engine warms up it goes away. Yet another reason why you shouldn't push it when the engine is cold.
Engines with forged pistons tend to have more piston to wall clearance than engines with cast pistons, because they expand more.
On my engine you can in fact see the rings and jiggle the pistons around a bit, it has piston slap but when the engine warms up it goes away. Yet another reason why you shouldn't push it when the engine is cold.
I just called my uncle told me the same thing. -the one ive worked on alot of v-8 motors with. he also said that forged pistons expand.
a little gap is ok. thats an old "speed secret" i asked the guy who built it when i pick it up.
he said that`s the right way to built FI motors with these pistons. and yes i can see the ring on mine too.
FYI that place call "JMS racing engines"
12-01-2004, 07:55 PM
#106
3.0 BAR
Join Date: Mar 2003
Posts: 21,479
Re:my garage...56K **pulled a piston**
Why aren't the other 3 pistons like that is they are supposed to be like that? 
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12-01-2004, 07:59 PM
#107
3.0 BAR
Join Date: Aug 2003
Posts: 1,950
Re:my garage...56K **pulled a piston**
Yep, forged pistons always slap when they're cold because they expand so much. Compression test when the engine is warm and you would probably have good compression. Don't know why the bearings went to pot in so little time though.
12-01-2004, 08:17 PM
#109
3.0 BAR
Join Date: Dec 2004
Posts: 2,133
Re:my garage...56K **pulled a piston**
Originally Posted by sccaeg
Originally Posted by Dr.Boost
Why aren't the other 3 pistons like that is they are supposed to be like that?
BTW; kick *** garage
12-01-2004, 08:22 PM
#110
0.0 BAR
Join Date: Jun 2003
Posts: 0
Re:my garage...56K **pulled a piston**
Originally Posted by sccaeg
Originally Posted by Dr.Boost
Why aren't the other 3 pistons like that is they are supposed to be like that?
Originally Posted by sccaeg
its not like it just sits in there and you can just move it like its nothing... but the others have 0 play, and that #1 piston has just a little.
Contradicting yourself a little?
