Basic B20 build questions

[A-man]

how much do u recess them by? how many mm will this compromise the durability of the piston

[trism]

what about aftermarket pistons? any decent ones for b20 that dont require machining for valve relief?

[TODA AU]

how much do u recess them by? how many mm will this compromise the durability of the piston

B20B std intake valve is 31mm diameter head,
Std B16A/B18C intake valve is 33mm head
This gives an obvious increase of 1mm in flycut radius.
Rather than guess, you should clay the pistons tops to double check,
Durability compromise is yes & no...
Machined / dressed just enough & it's not over stressed in use or tune.
Reliability is uncompromised.
Overdone on the machining / dressing and or over stressed use or tuning
Reliability can be severly compromised.

what about aftermarket pistons? any decent ones for b20 that dont require machining for valve relief?

Yes...
We have TODA Pistons in stock for this exact use.

[Benson]

RS machine piston!

Do a little research on them.

Most of the yanks use RS machine pistons as they are cheap and are bang for bang. They are half the price of any well branded pistons on the market

They make amazing power. They were designed around the ITR style piston but in 84mm size.

With the right combo, those piston can make over 150kws. Comp will be around 11.7:1 depending on the head

[_FeRiO_]

Ive seen alot of US B20 builds using these RS Machine pistons. Would you recommend using these with stock rods with upgraded rod bolts? Also, would there be great power difference in using the RS machine pistons along with a P72 head with ITR cams and IM compared to a full stock bottom end?

[Benson]

Stock rods and upgraded ARP rod bolts are perfect for the RS machine pistons.

In terms of power, you will probably see the potential of the RS machine bottom end work better with a bigger cam and some port work.

Having said that, if your looking to upgrade at a later stage, the RS machine bottom end would be ideal.

The stock bottom end can only go so far thats why the rs machine bottom end is a better platform.

If your not looking to do anymore work to the engine, then the stock bottom end is your winner

[TODA AU]

In the context of this thread, “Basic B20 Build”
& you’re after a cheap reliable street B20, cast pistons will probably serve you well.
It’s all good & well to do things on a budget…
Just don't be fooled by snake oil…

[_FeRiO_]

Not sure what you mean by being fooled by snake oil, but im trying to gather as much information as i can before i plan my setup. What do you think is necessary in a budget reliable setup for a B20 apart from piston fly cuts?

[Benson]

if its not a race car, cast pistons are fine. I will only use forged pistons if the engine is use under extreme pressure i.e racing

[replenished.soul]

Stock rods and upgraded ARP rod bolts are perfect for the RS machine pistons.

In terms of power, you will probably see the potential of the RS machine bottom end work better with a bigger cam and some port work.

Having said that, if your looking to upgrade at a later stage, the RS machine bottom end would be ideal.

The stock bottom end can only go so far thats why the rs machine bottom end is a better platform.

If your not looking to do anymore work to the engine, then the stock bottom end is your winner

Rs machine pistons ayes benson? hmmm lolz

[ZeForce]

Not sure what you mean by being fooled by snake oil, but im trying to gather as much information as i can before i plan my setup. What do you think is necessary in a budget reliable setup for a B20 apart from piston fly cuts?

ARP rod bolts + head studs and good tuning

[_FeRiO_]

replenished.soul, you using RS machine pistons on a B20 setup?