trio

iTrader: (1)

Hi, Merry Christams and a happy new year to you all!

Has anyone else noticed their forged engine sounds like a bag of spanners recently, i dont drive my car much and i wince at the sound everytime i start it up. is there anything i can do to make it less rattly?, it currently has 10 /50 silkolene pro in it, is it normal for forged engines to sound so bad for the 1st few minutes/miles, should i allow the engine to idle for 5mins before driving away.

Thanks Tristan

Terminator X

iTrader: (7)

Are you sure it's forged, they might have slipped a diesel in there

TX.

trio

iTrader: (1)

haha, api built it, i hope so for the money it cost me

harrisard

iTrader: (6)

my forged evo 6 sounded like a dog on cold start once warm was fine.

merry xmas and happy newyear

New_scooby_04

iTrader: (4)

Depending on your choice of piston, forged engines can be VERY noisy when cold!

Someone on here once described it as sounding like:

A skeleton w*nking in a biscuit barrel

It's just the pistons needing heat to expand; pistons with low silicon content are the biggest offenders.

If it gets quieter when the cars warms up it's nothing to worry about and if APi built it, it'll be fine!!

PS What did you have done??

Steve Whitehorn

iTrader: (13)

API built mine. Its as noisy as anything when cold.
Omega pistons, flanged liners.
Its just what they do.
In actual fact it is a good sign. As the forged pistons expand with the heat to fill the bore and they need to expand somewhere.

StrikE

iTrader: (3)

never heard that un before.... funny

trio

iTrader: (1)

A skeleton w*nking in a biscuit barrel, haha love that decribes it perfectly!

i have no doubts about api's work, im sure they fitted omega pistons when it was rebuilt, the rattle dissapears after a couple of miles of taking it very easy once warm ,but im sure its more pronounced with this cold weather, i had a full forged rebuid after the bottom end developed a rattle after a rolling road shoot out day,

the build consisted of :-

nitarted crank
acl race bearings
api steel rods
omega pistons
uprated oil pump
walbro 255 fuel pump
decat downpipe
full 3inch exhaust
lightened flywheel
api exceddy clutch
550 injectors
harveys tdo5 18g
3port B/S

is the 10/50 oil to thick for the cold winter and would it benefit from a 10/40

Thanks Tristan

Terminator X

iTrader: (7)

10/50 over here as suggested by the Oilman ... perhaps PM him for advice?

TX.

ALi-B

iTrader: (1)

In sub zero temps 10w/40 and 10w/50 are pretty similar when cold (10w is its viscosity rating when cold). The noise is not from lack of lubrication nor oil thickness, its the piston skirt hitting the cylinder bore at bottom or top dead centre when the angle of the conrod changes. So long as this ceases when warm and oil consumption is not excessive, there is no problem.

A thicker oil that clings to the bores "should" dampen/cushion the noise more than a thinner oil. But you are not curing the cause of the noise (which isn't a problem anyway), its just insulating the noise, and obviously thicker oils aren't good for circulation to other more important parts of the engine.

No harm is asking oilman though.

My advice; park the car in a heated garage (only needs to be 5 to 10 degrees) or turn up the radio.

360ste

iTrader: (1)

Reading this with interest as looking into a forged build as close to the limit on my bugeye STi on standard internals. 416 bhp at 102k miles still running smoothly, I know it sounds rough with the GEMS ecu when cold so GEMS + bag of spanners = louder stereo. So best plan that aswell.

New_scooby_04

iTrader: (4)

How noisy depends on the make of pistons. Supertech are apparently very quiet; they're what I'm having fitted on my car.

Ns04

trio

iTrader: (1)

ALi-B, everything seems fine once the engine is warm, and the car never uses a drop of oil between changes, the reason i asked if a 10/40 would have been better was im sure i read on here a few days ago that someone swapped between 10/40 -10/50 dependant on summer and winter, but you seem to of answered my question, so il probably just stick with the 10/50 silkolene which was recomended by opie oils.

my car is garaged when not being used so thats as much as i can do i suppose, dont think il bother heating it tho just turn that stereo up full

AndyC_772

iTrader: (2)

Another API forged engine owner here - and yes, it's noisy when cold, but quietens down nicely once it's thoroughly warmed up. In fact with a fresh tank of V-power and sub-zero temperatures outside it's as smooth as silk

It uses a bit of oil too, but seems better since I've made a point of letting the engine run for a couple of minutes after a cold start before moving off.

360ste

iTrader: (1)

I bet the neighbours are happy. LOL. I don't think mine would be as I have a 3.5 inch exhaust so it is quite loud and that is with the bung in place.