I'm planning on building up my b18c1. Compression wise, I would prefer to be 11.5-11.8:1. Initially, I was planning on purchasing IB Spec Wisecos/Eagle Rods. But why not just go with stock pistons? For example, JDM ITRs or JDM p30s. I believe those would yield mid 11 compression.

What is the benefit of going with a forged aftermarket 11.5:1 piston as opposed to a stock cast jdm itr piston?

GSR rods should be ok with upgraded ARP bolts for 9000rpm?

Stock rods are lighter than Eagles right? Would anyone happen to know how much of a difference?

 

i could have sworn that p30 pistons will only yield a 11.5 cr in a b18b block?

 

For stock bore sizes and available compression OE pistons are extremely hard to beat.

Stock GSR rods wiegh 545gr. and Eagles wiegh about 525grams.

 

How does the longevity of forged pistons compare to the oem cast ones?

 

I'm wondering too, bump this back to the top. I figured since forged pistons are tougher they'd last longer. No? Do they wear out the sleeves? If you were to go with heavy duty aftermarket sleeves would that make them more long-term?

 

ttt

 

I like stock pistons, piston slap sucks.

 

Thats weird, I have minimal piston slap with my JE's. Sounds like stock on startup.

 

Forged pistons really have no advantage allmotor. The way I see it, they are really better only if you go with forced induction.

 

having slap will depend on if you are going with high silicone or low silicone forged pistons. High silicone are brittle compared to low silc. but, still tougher and expand less than stock which is why you can run tighter clearences with them. Low silicone are the least brittleand the strongest but expand alot [usually just used for pulled track cars] which is why thet are run at loose clearences.

 

I was talking to an engine builder and he recommended against going forged. They might be stronger, but they are softer which makes them wear faster.

Strength and durability don't always go together...in fact, it seems to me that it's quite the opposite when it comes to car parts.

 

P30's all the way bro. Put JE's 11.5.1 comp and sound's ugly on start up.Put p30's and problem was gone

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spirit7627 &raquo;</TD></TR><TR><TD CLASS="quote">having slap will depend on if you are going with high silicone or low silicone forged pistons. High silicone are brittle compared to low silc. but, still tougher and expand less than stock which is why you can run tighter clearences with them. Low silicone are the least brittleand the strongest but expand alot [usually just used for pulled track cars] which is why thet are run at loose clearences.</TD></TR></TABLE>

The problem here is that high silicon forged pistons are somewhat tough to find. For whatever reason, the aftermarket definitely favors low silicon pistons.

 

ahh... that's why. So 80,000 miles (hopefully) you have to buy some more pistons and get sleeved... making more$$$ off us.