Forged Engine Noise?

[Dan Evans]

are all forged engines louder than a standard one??

I've just done my 500 miles, and put some thicker oil in with a new filter, but my engine is still quite tappety when cold, are they all like this or have i got a problem????

[Sanchez]

Yeah read a few time that they are quite loud (tappets) same as mine mate, is quite loud on startup, settles a little when warm.

[Dan Evans]

thats ok then because mine goes quiet when warm aswell

[Ryan-11]

Yeah mines been like that for bout 25,000 miles and no problems

[Matt Glanza]

i think its piston slap or sumin.think the wisco ones are notorious for it.nothing to worry about though

[Dan Evans]

thank fooooook for that lol, sounds abit awful but when its warm sounds insane lol

[rorenapier]

It will tap due to the ring gap size and piston to bore clearnace.

The bigger the ring gap the more the slap, same with piston to bore clearance, until the piston expands with the heat.

[Asad]

piston slap is something to be feared,

http://www.1fastv6.com/Dieselectomy/

http://www.pistonslap.com/whatisit.htm

as the man above said, when its warm it settles down thus no noise

[Dan Evans]

well im being told its nothing to worry about, and now it is something to worry about????

will someone please clarify this for me???

[Sanchez]

I think i would listen to the guys who have forged engines and have run them for thousands of miles

[Dan Evans]

cheers dude, i must admit it does sound sweet when its warm, but just on start up sounds iffy.

[Sanchez]

If your worried dude, take it to someone that know what they are on about ie, TMD, TD, PP etc

[Dan Evans]

nah not too worried about it just aslong as its not just mine thats like it

[Ricky@Race-Tech]

It will tap due to the ring gap size and piston to bore clearnace.

The bigger the ring gap the more the slap, same with piston to bore clearance, until the piston expands with the heat.

Not true, its only the piston to bore clearance that effects piston slap.

Dan, Do you know your piston to bore clearance? If it goes away when hot it should be fine anyway.

[Dan Evans]

i cant remember dude, i do know that it was all spot on when i did it though mate.

thats ok then. ceers for everyones help

[sx_turbo]

nout to worry about,

only time i would worry about it, is when it sounds like an old rattle box fiesta 1.1 rattlin it's tits off when hot and cold.

[GTS GAV]

Its to do with the silica content in the forged pistons dude usualy deppendant on what copression ratio you went for, piston slap is nothing to worry about but after very very very long periods of time they can oval the bores in extream cases, if the silica content is low as the less silica content the more the piston will exspand and contract but with less silica there much stronger, heres some info i put on a mr2 forum for some guy on the mr2 forum asking the same question hope it helps

Aluminum alloys used for pistons come in a wide variety, with varying degrees of copper, magnesium and silicon content. Though each material adds its own properties to the alloy, silicon content is the main material in the overall characteristics of the alloy and piston.

Hypoeutectic – 11% or less silicon content.

Hypereutectic – Greater than 12% silicon content.

In the piston business hypoeutectic alloys are referred to as low silica alloys, while hypereutectic are referred to as high silica alloys.

In short, hypoeutectic (LOW SILICA) alloys posses a thermal expansion rate greater than typical engine block materials. This requires running higher clearances, (which affect engine noise), wear and emissions. On the up side, these alloys are strong and well suited to extreme forced induction applications to be able to run much higher boost levels etc.

Hypereutectics (low silica) have thermal expansion rates equal to or less than the surrounding cylinder. Allowing tighter clearances to be run. Unfortunately they are brittle, and less tolerant to high boost pressures.

in hign side it probebly means you have a low silica forged item fitted wich isnt a bad thing ;)