Engine knock or just pistons?
04-12-2018, 04:10 AM
#1
Honda-Tech Member
Thread Starter
Engine knock or just pistons?
i have a b18c1 with what is either. A type R or b16A JDM Head. On start up it makes a knock sound but is mostly noticeable when cold and kind of goes away when it warms up. I was told it was the aluminum pistons and that it always did that since the motor only has about 15K miles on it after rebuild and I do trust him since it’s someone I’ve known for a while that j got it from. It has golden eagle rods, sleeves and pistons 84.5. Has anyone else ever experienced this?
04-12-2018, 04:45 AM
#2
I like the tuna here
Re: Engine knock or just pistons?
Some types of material used in forged pistons will contract at low temperatures and expand to fit better at high temps, so it's possible. I'm not an expert, but I don't think rod knock really goes away once it's warmed up, so I'd say it's more likely your friend is correct. The only way to be sure is to tear it down and check bearings and clearances, which is why I built my engine myself. It's hard to trust that even if someone isn't deliberately screwing you, they still might just be misinformed.
04-12-2018, 05:01 AM
#3
Honda-Tech Member
Thread Starter
Re: Engine knock or just pistons?
Some types of material used in forged pistons will contract at low temperatures and expand to fit better at high temps, so it's possible. I'm not an expert, but I don't think rod knock really goes away once it's warmed up, so I'd say it's more likely your friend is correct. The only way to be sure is to tear it down and check bearings and clearances, which is why I built my engine myself. It's hard to trust that even if someone isn't deliberately screwing you, they still might just be misinformed.
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