Lighter Piston, lose torque :(?
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Freshman User
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Lighter Piston, lose torque :(?
If I change the pistons out and put a lighter piston in there would it make my truck loose torque?
Another question, what piston can I put in my truck to make a higher compression ratio?
1995 f150 300 EFI Straight 6
Manuel Transmission.
Another question, what piston can I put in my truck to make a higher compression ratio?
1995 f150 300 EFI Straight 6
Manuel Transmission.
Elder User
Joined: Jun 2005
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From: northeast, KY
I've heard that you can run pistons from a 351, but you have to put bushings in the rods or run the early model rods from the straight 6. Someone correct me if I'm wrong, I'm not for sure on this.
Matt
Matt
Postmaster
Joined: May 2002
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From: Broken Arrow, OK
Lighter pistons should give you more torque, not less.
The easiest path to increased compression in an EFI engine is to run a carb piston. The stock EFI pistons have about a 33cc dish, the carb pistons have a wide range of dish sizes but most are about 15-20 cc. That is enough for an increase between 3/4 and 1 point.
The easiest path to increased compression in an EFI engine is to run a carb piston. The stock EFI pistons have about a 33cc dish, the carb pistons have a wide range of dish sizes but most are about 15-20 cc. That is enough for an increase between 3/4 and 1 point.
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Okay, if I go to the junkyard and pull out the pistons off a carbed 300 and put it in my efi motor. Do I need to change out the connecting rods? Or is there anything special that I need to change out?
Fleet Owner
Joined: Sep 2005
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From: Lake Tahoe, Nevada
Hey Evil, if you are planning to use junkyard pistons, I hope you are really good at determining condition. It would be a shame to go to all that work and find out you had to do it all over. All the carbed motors you find will be pretty old.
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Okay, I Agree, I'm not going to do that. I didn't think it'll be that bad? Can someone show me some pics of the regular piston that comes with the EFI Truck and the piston yall talking about so I can compare them.
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From: Spokane, WA
http://kb-silvolite.com/spistons.php...=Ford&Div=Ford
Go to that site, scroll down to the 300 ci/4.9L pistons and enjoy.
Go to that site, scroll down to the 300 ci/4.9L pistons and enjoy.
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Thanks dude, will this piston work with my efi 95 f150 http://kb-silvolite.com/spistons.php...ails&S_id=118?
Postmaster
Joined: Dec 2006
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From: Spokane, WA
Might try Federal Mogul too. Shop that rebuilt my engine used to use Silvolite but had problems with scuffing/slapping and changed to FM.
That piston you have linked is for an older model engine...less than 8:1 cr. Newer EFI piston would probably be better with higher cr.
That piston you have linked is for an older model engine...less than 8:1 cr. Newer EFI piston would probably be better with higher cr.
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