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VH 4.2 v8 motor fuel additives

AndrewC

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Howdy Commodore lovers,

Help! I have been told that I can run my 4.2 vh on 98 high octane fuel such as vpower and I don't need to add fuel additives. I have only just purchased the car and don't want to stuff my motor. Any assistance would be greatly appreciated. The heads on the motor have not been modified, she's as standard as the day it left the factory.

Cheers,
Andrew
 
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you'll need to add a valve seat lubricant like flash lube.. there used to be lead in fuel that lubricated the soft seated valves of the older cars but they have taken lead out of fuels to be safer.. modern engines have hardened valve seats so they dont need a lube.
 
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hey ari what makes 98 different becides octain... why can you run it without a valve lubricant
 

vkberlina

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Read my numerous posts on fuel additives.

Basically 2 reasons
The additives burn at a much lower temp so they will not actually prevent valve seat recession.

The higher the octane fuel the lower the combustion temp

Scott
 

VR38

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you'll need to add a valve seat lubricant like flash lube.. there used to be lead in fuel that lubricated the soft seated valves of the older cars but they have taken lead out of fuels to be safer.. modern engines have hardened valve seats so they dont need a lube.
Soft valve seats? You mean the cast iron, used in all Holden motors right upto the year 2000?
 

vkberlina

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Soft valve seats? You mean the cast iron, used in all Holden motors right upto the year 2000?
Post 86 saw the introduction of hardened seats being machined into the cast heads which is a relatively straight forward job

How ever converting a car to run on regular 91 octane unleaded is more than just changing valves & seats.

Scott
 
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