22 in Hg (22 inches of Mercury at idle) and the needle is dead straight. What does that really mean? Well, as engines get older and more and more worn, they exhibit problems which are found using different tools. One of which is a vacuum gauge. Remember that air is traveling through your intake manifold to get to your multi-cylinder engine (V6-V8) creating a constant vacuum. Because this vacuum is consistent, we can use it to see how well the engine is sealing against atmospheric pressure. Taking these readings at different engine operating conditions will give an overall reading of the interior.....valve stems, valve guides, valve seats, valve faces and compression rings. This is done on a tap to the intake manifold or with a T-fitting. (Never use a vacuum canister or EGR line as they aren't accurate for this test).
Typically an engine under 50,000 miles will pull around 20-21 in Hg of vacuum at idle (V6-V8).
An engine over 100,000 miles will pull 17-19 in Hg of vacuum at idle (V6-V8)
An engine in the 150,000 miles will pull 16-18 in Hg of vacuum at idle (V6-V8)
an engine over 200,000 miles usually will pull 15-17 in Hg of vacuum at ldle (V6-V8)
Over 250,000 they are in the 15 - 16 in Hg.
We use these numbers that are provided by ASE Certified Technicians. They use these as a typical reference for customers coming into their shops.
We had the 2005 Dodge Grand Caravan SXT in the repair facility for a transfer tube coolant leak behind the back of the engine between the firewall and the exhaust manifold. While they repaired the leak, they also put a vacuum gauge on the 3.8L to see the condition of the engine since they don't get many vehicles in there with 272,000 miles on them.
To their utter surprise, the engine at idle pulled 22 in Hg and the needle was dead straight and not varying or moving at all.
The ASE Technician called me and said that not a single vehicle in their shop has pulled more than 20 in Hg in a very long time and these are 5 year old cars not 12 year old cars etc.
He asked me how often we change the oil in the van and I replied ....."every 12,000 miles with our oil and filter" and he said WHAAATTT!!??
He then told me that he knew about us in our business as he has worked on this van for it's entire life. He knows it has the original valves, pistons and rings and was only open once to replace a broken intake spring and a broken exhaust spring.
He said he now has empirical evidence that our materials are something that really truly works and as he said......"the vacuum gauge doesn't lie!!" ACES IV and QuantumBlue produce these results!:rocker:
I thought I would share this with our customers and potential customers.
Regards,
Brian
BND Automotive LLC:driving:
440-821-9040
www.bndautomotive.com
Typically an engine under 50,000 miles will pull around 20-21 in Hg of vacuum at idle (V6-V8).
An engine over 100,000 miles will pull 17-19 in Hg of vacuum at idle (V6-V8)
An engine in the 150,000 miles will pull 16-18 in Hg of vacuum at idle (V6-V8)
an engine over 200,000 miles usually will pull 15-17 in Hg of vacuum at ldle (V6-V8)
Over 250,000 they are in the 15 - 16 in Hg.
We use these numbers that are provided by ASE Certified Technicians. They use these as a typical reference for customers coming into their shops.
We had the 2005 Dodge Grand Caravan SXT in the repair facility for a transfer tube coolant leak behind the back of the engine between the firewall and the exhaust manifold. While they repaired the leak, they also put a vacuum gauge on the 3.8L to see the condition of the engine since they don't get many vehicles in there with 272,000 miles on them.
To their utter surprise, the engine at idle pulled 22 in Hg and the needle was dead straight and not varying or moving at all.
The ASE Technician called me and said that not a single vehicle in their shop has pulled more than 20 in Hg in a very long time and these are 5 year old cars not 12 year old cars etc.
He asked me how often we change the oil in the van and I replied ....."every 12,000 miles with our oil and filter" and he said WHAAATTT!!??
He then told me that he knew about us in our business as he has worked on this van for it's entire life. He knows it has the original valves, pistons and rings and was only open once to replace a broken intake spring and a broken exhaust spring.
He said he now has empirical evidence that our materials are something that really truly works and as he said......"the vacuum gauge doesn't lie!!" ACES IV and QuantumBlue produce these results!:rocker:
I thought I would share this with our customers and potential customers.
Regards,
Brian
BND Automotive LLC:driving:
440-821-9040
www.bndautomotive.com