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PreMods - P2 -Detonation
 

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BEFORE ANY TURBO MODS

CONTENTS
Iconbefore.gif (4193 bytes)
To MODIFY or NOT
DETONATION
Pre-ignition & Fuel
Fuel Volume & Pressure
Air Supply
Exhaust & Heat
Lubrication
Cooling & Water
Breathing
Boost
Modification Sequence
Conclusions
BEFORE Turbo Modifications - Page 2   Next Page;- Pre-Ignition & Fuel

 

TheTurboClub is not influenced by any business or organisation in our advice to you.  

Endorsements may be made by publishing comments from RTO's on service experienced by them in the course of dealings with various companies.

This also may include benefits to RTO's from businesses in the way of discounts on mods or service to their cars.

Considerations prior to modifications on any Make or Model of Turbo.

DETONATION & PRE-IGNITION

PINGING, PINKING ( or DEATH RATTLES )

These are names for two conditions that can cause loss of power or pistons. You have probably heard them under the bonnet your self.

Detonation and Pre-ignition are two separate effects with different causes, but can occur at the same time. Detonation of the fuel air mixture under boost conditions is the number one enemy of any turbo engine. Detonation is defined as it says as a detonating effect in the combustion chamber on the compression stroke as the piston progresses on to its downward power producing travel under normal operation. The power caused by combustion is meant to be produced in a smooth (relatively) expanding of various gases as a product of burning the fuel air mixture.

Detonation is similar to hitting the top of the piston with a gelignite charge instead of a mighty push. I have not read any statistics on this but I suspect that the flame front on normal combustion travels throughout the chamber at up to three thousand feet per second similar to a rifle cartridge being fired. This produces the fast push to the piston from the rapidly expanding gasses, while the speed of the flame front on detonation could be up to ten thousand feet per second, similar to an explosive initiating detonator.

From experience this is similar to the known fact that under loading ( less powder than air at the right ratio) in a rifle cartridge can cause the effect of the whole breech block exploding instead of just pushing the projectile down the barrel. My early career was RAAF Armourer with extensive weapons and advanced explosives training and experience, so I have drawn my own conclusions above. Irrespective of cause,

Detonation is to be avoided at any cost.

Warning, the All TURBO CLUB Register makes this information available to you with NO express guarantee's implied or otherwise on the suitability of the information being relevent to your Automobile Make or Model. You should not make any modifications to your Automobile unless a qualified Mechanic has approved and checked that the vehicle is safe and roadworthy and meets all relevent State Governed Regulations before proceeding onto public roads. The information contained in this ATCR Website is believed to be correct but the Author and Publisher make no warranties, express or implied that the information is free of errors, or that it will meet the particular requirements of individual Automotive application.

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PreMods - P2 -Detonation

 

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 This page was last updated on 19-Mar-2009 18:34.

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