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Old 12-23-2010, 08:56 AM   #1
ernie's 5oh
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Default Is this piston to heavy?

I have a new set of CP pistons for my sbf, 4.125 flat top, great looking piston very beefy, now is it too beefy?
it weights 665 grams 90 grams more then my last set, most of the weight is in the thickness of the piston top, not sure the technical name for it. The thickness is .350" almost .100" thicker then my last.
I'm running more nitrous then my last motor, and running a heads up class.
Do you think I should look into milling underneith, or leave it thick?
I'm sure the guys at CP know what they are doing.
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Old 12-23-2010, 09:08 AM   #2
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Default Re: Is this piston to heavy?

I think more on the dome would be good?
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Old 12-23-2010, 09:12 AM   #3
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Default Re: Is this piston to heavy?

What is the peak rpms going to be, and whatkind of rods? I know they have options for that when you buy the custom pistons.
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Old 12-23-2010, 11:46 PM   #4
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Default Re: Is this piston to heavy?

Quote:
Originally Posted by ernie's 5oh View Post
I have a new set of CP pistons for my sbf, 4.125 flat top, great looking piston very beefy, now is it too beefy?
it weights 665 grams 90 grams more then my last set, most of the weight is in the thickness of the piston top, not sure the technical name for it. The thickness is .350" almost .100" thicker then my last.
I'm running more nitrous then my last motor, and running a heads up class.
Do you think I should look into milling underneith, or leave it thick?
I'm sure the guys at CP know what they are doing.
I guess 665g is with the pin right? I think your piston should be no more than 600g with the pin but then again it all depends... Remember Steve's green mustang with the 420ci Bennett motor... I was tuning the car at the CSCN, he finished runner up to Splash camaro... well the pistons in that motor don't weigh more than 600g and in the final round I put a 700hp tune up in that speedtech system and car become air born 4 wheels of the ground broke the wheelie bars lol... The fastest we run was 8.16@178mph (stock suspension) 2 years of 500-700hp spray never hurt a thing!!! A bad tune will melt the best piston! My 2c

Last edited by bad427; 12-23-2010 at 11:49 PM.
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Old 12-23-2010, 11:59 PM   #5
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Default Re: Is this piston to heavy?

Remember this : http://m.youtube.com/#/watch?xl=xl_blazer&v=8cE2XC-Mhjs
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Old 12-24-2010, 09:44 AM   #6
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Default Re: Is this piston to heavy?

Sorry about the link is from my iphone.. try this: http://www.youtube.com/watch?v=i6Gu_8H2xdc
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Old 12-24-2010, 01:05 PM   #7
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Default Re: Is this piston to heavy?

Quote:
Originally Posted by bad427 View Post
I guess 665g is with the pin right? I think your piston should be no more than 600g with the pin but then again it all depends... Remember Steve's green mustang with the 420ci Bennett motor... I was tuning the car at the CSCN, he finished runner up to Splash camaro... well the pistons in that motor don't weigh more than 600g and in the final round I put a 700hp tune up in that speedtech system and car become air born 4 wheels of the ground broke the wheelie bars lol... The fastest we run was 8.16@178mph (stock suspension) 2 years of 500-700hp spray never hurt a thing!!! A bad tune will melt the best piston! My 2c



I wish the piston alone is 665 the rist pin is another 176
But I have corella rods more then strong enough, just wondering how much power I will loose from being crazy heavy.

peek rpm should be around 8500-8700
and its a 412 ci with a 3.85 stroke

Last edited by ernie's 5oh; 12-24-2010 at 01:08 PM.
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Old 12-24-2010, 02:09 PM   #8
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Default Re: Is this piston to heavy?

Quote:
Originally Posted by ernie's 5oh View Post
I wish the piston alone is 665 the rist pin is another 176
But I have corella rods more then strong enough, just wondering how much power I will loose from being crazy heavy.

peek rpm should be around 8500-8700
and its a 412 ci with a 3.85 stroke
Steel rod @ 8700rpm with 2 stages and a piston with pin that weighs 841g... Ouch!!
I am not an expert but you better of with an aluminum rod! I hate aluminum rods but that is lots of punishement for a steel rod!!!
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Old 12-24-2010, 02:20 PM   #9
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Default Re: Is this piston to heavy?

Quote:
Originally Posted by ernie's 5oh View Post
I have a new set of CP pistons for my sbf, 4.125 flat top, great looking piston very beefy, now is it too beefy?
it weights 665 grams 90 grams more then my last set, most of the weight is in the thickness of the piston top, not sure the technical name for it. The thickness is .350" almost .100" thicker then my last.
I'm running more nitrous then my last motor, and running a heads up class.
Do you think I should look into milling underneith, or leave it thick?
I'm sure the guys at CP know what they are doing.
what is the comp height? Yes, thats pretty heavy. done them (NOT CP) with more top ring land than that weigh 520g range amdn pins in the 135-150g range
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Old 12-24-2010, 03:32 PM   #10
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Default Re: Is this piston to heavy?

comp height is 1.265 the piston is .010" in the hole 4.126 bore I do have a solid (heavy 58.5lbs) bryant crank, I think the only thing that will help me is that the stroke is only a 3.85
The rist pin, is a .990
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Old 12-24-2010, 03:38 PM   #11
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Default Re: Is this piston to heavy?

That is a heavy piston. Once a piston has been cam ground to size you do not want to modify the deck as it can tweak the skirts.
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Old 12-24-2010, 03:42 PM   #12
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Default Re: Is this piston to heavy?

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Originally Posted by NOS-Nelson View Post
That is a heavy piston. Once a piston has been cam ground to size you do not want to modify the deck as it can tweak the skirts.

the pistons already have the valve reliefs if thats what you mean, its ready for ceramic coating, and the thinest part of the piston is .350"
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Old 12-24-2010, 03:46 PM   #13
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Default Re: Is this piston to heavy?

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Originally Posted by ernie's 5oh View Post
the pistons already have the valve reliefs if thats what you mean, its ready for ceramic coating, and the thinest part of the piston is .350"
No I meant you don't want to mill the underside of the deck to reduce weight. .350 is extremely thick. Is it any thinner under the valve reliefs?
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Old 12-24-2010, 03:52 PM   #14
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Default Re: Is this piston to heavy?

Quote:
Originally Posted by ernie's 5oh View Post
comp height is 1.265 the piston is .010" in the hole 4.126 bore I do have a solid (heavy 58.5lbs) bryant crank, I think the only thing that will help me is that the stroke is only a 3.85
The rist pin, is a .990
Is Paul Silva building your engine? He is being doing sbf's before I even knew mustangs existed! What does he have to say? I would listen to Paul if he is building your engine!
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Old 12-24-2010, 04:06 PM   #15
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Default Re: Is this piston to heavy?

Quote:
Originally Posted by ernie's 5oh View Post
I have a new set of CP pistons for my sbf, 4.125 flat top, great looking piston very beefy, now is it too beefy?
it weights 665 grams 90 grams more then my last set, most of the weight is in the thickness of the piston top, not sure the technical name for it. The thickness is .350" almost .100" thicker then my last.
I'm running more nitrous then my last motor, and running a heads up class.
Do you think I should look into milling underneith, or leave it thick?
I'm sure the guys at CP know what they are doing.
CP builds pistons to specs that builders ask for. I assume your builder asked for them that way.

Last edited by Northside; 12-24-2010 at 04:08 PM.
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