projekteg

ok, me and my boy replaced his stock (slightly toasted) b16 bottom end this weekend, in it's place, a jdm b16a with forged rods and pistons (already assembled when purchased). we got it in and running last night, but there was a little knocking/tapping sound when we first started it, it was about 10°F outside and the block sat outside over night, etc., basically, the block was freezing cold. i told him forged internals make noise when they're cold, he doesn't want to believe that and thinks it's something serious. we never let the car fully warm up, but the slapping was getting noticeably more faint the longer the car ran. can you guys please post in here some reassurance for this *** hat that fogred internals make noise :P

88crxSi

most cars make slap noises when cold, forged or not.
up here when its -30c out the pistons slap, until the car warms up , the pistons expand and fill out the cyl better.

does it have a block heater?

projekteg

wtf is a block heater

88crxSi

it plugs into a wall outlet and heats the block (hense, block heater) so it's easier to start int he morning.

projekteg

lol, i thought that's what you were talking about, na, we don't have/use those silly things, it's usually not that cold here, sometimes i just bring my engine in and let it sleep on the couch if it's real cold

90turbohatch

My d16a6 with forged internals was definitely noisy compared to a stock motor, especially when cold.

HMT-Admin

what kind of pistons did you use (brand name)


and yes forged pistons will sometimes make a bit of noise when cold. I've yet to build one, but I've heard other peoples engines.

projekteg

i believe they're je pistons, he bought the block already assembled from a very trust worthy guy that we know and he personally put the block together, you may know who he is jeff (import jedi, larry). what do you mean you've never built an engine with forged internals?

HMT-Admin

I've never built a engine that made any noise w/ forged internals

I've heard alot of people complain about arais pistons making noise when cold, something about the alloy they use in their pistons are a bit differnt.

Shawn

My stock internals sound like this when the engine is started cold. In the mornings, its been anywhere from 5 to about 15 degrees F out so I just let the engine warm up for 10-15 minutes before heading out.