pistons

[J.T.]

I have a 4.6 that I am boring .030 over and I want to know what type or pistons to go with for nitrous. Where should I get the pistons from? Also this is on a budget so as cheap as possible(saving money for bigger cubes).

 

[DropTopPony]

Nothing cheap about aftermarket 4.6 pistons...

Manley, Mahle,CP,Diamond are all good brands making them.

Are you going with a high compression nitrous setup?

 

[J.T.]

Nothing cheap about aftermarket 4.6 pistons...

Manley, Mahle,CP,Diamond are all good brands making them.

Are you going with a high compression nitrous setup?

I do plan to do nitrous but I dont know what it a good compression for that. I think I remeber hearing anything 10:1 and below for a streetable motor. So are flat top pistons to high? and what will the compression be after that?

 

[jfor441]

Nothing cheap about aftermarket 4.6 pistons...

Manley, Mahle,CP,Diamond are all good brands making them.

Are you going with a high compression nitrous setup?

I do plan to do nitrous but I dont know what it a good compression for that. I think I remeber hearing anything 10:1 and below for a streetable motor. So are flat top pistons to high? and what will the compression be after that?

Flat top pistons and PI heads will be 12.5:1 Compression. It is streetable but you have to crank the timing down for street use.

With NPI heads you will be around 11.:1 compression which you should be able to run no problem on 93 octane fuel.

 

[J.T.]

Nothing cheap about aftermarket 4.6 pistons...

Manley, Mahle,CP,Diamond are all good brands making them.

Are you going with a high compression nitrous setup?

I do plan to do nitrous but I dont know what it a good compression for that. I think I remeber hearing anything 10:1 and below for a streetable motor. So are flat top pistons to high? and what will the compression be after that?

Flat top pistons and PI heads will be 12.5:1 Compression. It is streetable but you have to crank the timing down for street use.

With NPI heads you will be around 11.:1 compression which you should be able to run no problem on 93 octane fuel.

Awsome i will keep my npi pride! :banana: But now the question is does anyone have some pistons for sale?

 

[jfor441]

If you are gonna be spraying I would recommend getting forged rods also. You probably won't find any .030 pistons for sale. You gonna have to buy them new.

 

[Zwolaver21]

I have a set of brand new manley flat top pistons with rings that are for sale. I will let them go for 600+ shipping you wont get a better deal than that for some brand new stuff.

 

[Jrgunn5150]

Why are your boring it .030 over? 11:1 will run fine on the street, but you will want good rod's and bolt's as well.

Nothing cheap about aftermarket 4.6 pistons...

:hammer: There's nothing cheap about aftermarket 4.6, period, lol

 

[J.T.]

true that. that is why I am going to build another pushrod motor after this 4.6 runs.

 

[voidfinger]

yea a 11:1 cr nitros set up would be killer.. but get that 11:1 threw a pi head... don't waist time and money on the npi stuff... trust me.

 

[J.T.]

yea a 11:1 cr nitros set up would be killer.. but get that 11:1 threw a pi head... don't waist time and money on the npi stuff... trust me.

I have already done a lot of work to my heads (all my self, little money spent), and I am not really planning on spending too too much on this motor because I know that 2v are dogs. I just want to get some pistons and put a good squeeze on it and call it a day.

 

[GREG@SN95]

most people bore them .20 over. Thin sidewalls...

idk much about mod motors... but I'm surprised no one has said that.

 

[Jrgunn5150]

Why are your boring it .030 over? 11:1 will run fine on the street, but you will want good rod's and bolt's as well.

I said that.

 

[J.T.]

most people bore them .20 over. Thin sidewalls...

idk much about mod motors... but I'm surprised no one has said that.

Yah I think I have changed my mind on that I dont think I am going to bore it.

 

[voidfinger]

I've heard that a 2o over would unshroud the valves and make a bit more power... not 100% though.

 

[Jrgunn5150]

Anything over always unshrouds the valves, not enough to matter though. bore as little as you can.