Can anyone tell me what difference if any a snorkel will make to a toyota 4500 petrol motor.
Grumpy, here is a list of some benefits..... On a petrol Engine, they do benefit from the colder/more dense incoming air. This does equate to more power, not a lot, but it does work.
5 Reasons why your 4WD needs a snorkel.
1 COOLER OPERATION
Whether your 4WD is powered by a petrol or diesel engine, it's dependent on air for its operation. Fitting a snorkel means the air supply is drawn in at roof level and not the air intake, which is often located in the engine bay. The cooler air stream enhances engine performance due to the cooler air being more dense allowing better combustion and more power.
2 LESS DUST
Because the Airflow Snorkel draws air from roof level, dust isn't as thick and plentiful as it is in the engine bay or inner guard where many engine air intakes are located (if you look under the bonnet after a few kilometres of driving in dust you'll see what we mean!) The relatively cleaner air, via the Airflow Snorkel working with the original air cleaner system, will help extend air filter effectiveness, therefore reducing wear of vital components and leading to extended engine life and reliability.
3 SAFER AND STRESS FREE RIVER CROSSINGS
When crossing streams, rivers or bog holes is not the time you want the engine to die. Diesel engines in particular are very expensive to repair if water should get into them. But with the air supply via a positively sealed Airflow Snorkel well above water level, you can expect worry-free water crossings so you can focus on picking the best and safest route across.
4 RAM AIR EFFECT
Because a snorkel is forced through the air as the vehicle travels, it creates what is known as ram air effect. This has often been found to provide a welcome increase in engine performance.
5 CHEAP INSURANCE
With the average cost of rebuilding a diesel engine being around the $6000.00 and a petrol engine around the $3000.00 can you afford to take a punt next time you cross a river or a bog hole that is “a bit over the wheels” level. Don't risk your engine.