Reply to thread

See what others are reading now! Try Forums > Current Activity

Message: <blockquote data-quote="shiroitenshi" data-source="post: 2510321" data-attributes="member: 27518">white/bluish smoke is usually a sign of unburned fuel, either from too rich a fuelling (unlikely if you aren't running higher fuel pressures or had the car tuned by someone incompetent)It can also mean valve leakage. You can do a compression test to verify which piston's vavle is the source.Valve leaks means that during compression stroke, the unburned fuel is pumped out the exhaust valve or into the intake tract via the intake valve instead of being properly ignited by the plug at BTDC. on the next stroke, the engine runs too rich, and unburned fuel exits through the exhaust.The O2 sensor detects that the engine is running lean (O2 sensors detect unburned fuel as air, so it inteprets the engine as running lean, and increases fuelling, so when you take out your plugs, you'll see that it's all black/fouled, a sign of too rich a fuelling.)Piston ring seal can be gauged by looking at black smoke emitted through the exhaust, and listening to air escaping through the oil cap when manually rotating the crank. (but only if your valves are not the source of the leak)The amount of oil burned/the amount you need to top up between oil changes is also a sign of piston ring leakage. due to the stock setup of piping engine oil gases in the head to the intake pipe, vtec engines consume a nominal amount of oil even at peak condition, so note the amount of oil you need to top up, if it increases substantially, there's a possible piston ring leak that a leakdown/compression test can confirm.However this is unlikelier than valve leaks, because unless your engine ingests something, the bore should not be too affected, and we have 2 compression rings and an oil ring to boot on the stock piston! so that's it, unless you're using single ring racing pistons.. (O_o)Then again, I'd start with the valves, then check the rings. Due to the way they are related, you have to ensure that the valves aren't the source of the leak, then only troubleshoot the piston rings.Annealed rings are also a possible cause of piston ring leaks, but that's also a sign of trouble elsewhere, so if you have annealed piston rings when you stripdown, look for possible sources of engine overheating to the point the rings are annealed.There's also the method of removing each plug cable one by one to find out the problematic piston/valve leak, but due to the inherent dangers of dealing with high voltage, leave it to the professionals.These are all mechanic stuff, so if you mechanic knows what to look for, he should be able to decide the best course of action.</blockquote>

Verification

The Marketplace Latest

original WedsSport SA70 18x9jj offset +32 5H pcd...
- Started by david tao
- Chassis and Wheels
BRAND NEW original rare Yokohama ADVAN Racing RG4...
- Started by david tao
- Chassis and Wheels
original rare Yokohama ADVAN Racing RZ2 RZii...
- Started by david tao
- Chassis and Wheels
original rare Yokohama ADVAN Racing RG 16x7jj...
- Started by david tao
- Chassis and Wheels
original rare Yokohama ADVAN Racing RG 16x7jj...
- Started by david tao
- Chassis and Wheels
original rare Rays Volk Racing TE37SL 18x9jj offset...
- Started by david tao
- Chassis and Wheels
Spoon Sw388 18x10J+40 5H120 Rim Rims Civic FL5 Type R
- Started by aycy
- Chassis and Wheels
Spoon Crane Neck Wing Carbon Spoiler GT Wing Honda...
- Started by aycy
- Exterior and Body
Honda Jazz/Fit GK Mugen body kit
- Started by jeff6126
- Exterior and Body
original TWS Taneisya P1 racing 17x8.5jj offset +28...
- Started by david tao
- Chassis and Wheels

Posts refresh every 5 minutes

TT Tonight (18/03)

Salam/Greetings,

Some of us will be hanging out at Restaurant Subaidah in Kota Damansara tonight for a friendly talk cock sing song session. This is a new location proposed by our very own 'Doctor in da house'...

RB26 auto

to all sifu's here ....can an rb26 driven by an automatic transmission? tq

suitable piping for L2turbo

wats da saiz for L2turbo piping? 2"?
how much normally arh??
hehe

Search

Enjoying Zerotohundred?

Log-in for an ad-less experience

Reply to thread

The Marketplace Latest

original WedsSport SA70 18x9jj offset +32 5H pcd...

BRAND NEW original rare Yokohama ADVAN Racing RG4...

original rare Yokohama ADVAN Racing RZ2 RZii...

original rare Yokohama ADVAN Racing RG 16x7jj...

original rare Yokohama ADVAN Racing RG 16x7jj...

original rare Rays Volk Racing TE37SL 18x9jj offset...

Spoon Sw388 18x10J+40 5H120 Rim Rims Civic FL5 Type R

Spoon Crane Neck Wing Carbon Spoiler GT Wing Honda...

Honda Jazz/Fit GK Mugen body kit

original TWS Taneisya P1 racing 17x8.5jj offset +28...

Posts refresh every 5 minutes

Recent Posts

2026 Vios HEV launched with Local Battery Assembly - UMW Toyota Motor

SPPF: The Future of Automotive Surface Protection - A Technical Overview

Upping Wira 1.5 MMC performance

Volvo Malaysia Launches Locally Assembled ES90 Electric Sedan

AMPANG mari!!ZTH member

Search

Online now

Enjoying Zerotohundred?