I am told (since I just went through buying a mkiv) that you have compression numbers to tell you how well your rings, head gasket and valves are sealing the combustion chamber. If they are low then you won't make as much power. It is a good way (depending on how the numbers are) to find if the rings are worn, the valves aren't seating or if the headgasket has a leak. I am told if, say, two adjacent cylinders are experiencing lower compression, there may be a leak in the gasket. I think you check the rings for leaking first by dropping a bit of oil down the spark plug hole and re-running the test to see if that stops the ring blowby temporarily. Then you do something to check for bubbles coming out of the coolant cap to find a leak in the headgasket. A mechanic can do all that jazz. I am sure there is a tech article for the DIY'er too. You can't get a valid comp test from a car that has been sitting for a while, either, or so I am told.
When Doing a Compression test you will NEVER be consistant from cylinder to cylinder. Keep in mind your #5 and #6 cylinders burn hotter then the other 4. This is another reason to remove the EGR.
You'll notice a slight drop in compression on those two cylinders.
Since they all will NOT be consistant, its important they are all within 10lbs of eachother. If your #1 shows 147.. you dont want to fall below 137 or go above 157 on any other cylinder. I used #1 only as an example, it doenst matter what cylinder shows what....as long as they arent way diffrent then eachother.
I am looking for a new set of adjustable cam gears, and was curious what everyone recommended? The market is a lot different than it was 5 or 10 years ago, not as many options. The Powerhouse ones looked interesting, with the available adjustment kit and locking tabs for each degree.
It seems like my 2nd turbo is starting to go so thinking about going single.
I don't know that much about turbo's yet hence I'm coming here for help.
I found a nice brand new HX40 with a 60/86 billet compressor wheel and a 16cm^2 75/65 exhaust turbine.
In the beginning I'd like to...
I have the AEM Infinity 8 with the plug n play harness. According to AEM the Vehicle Speed Sensor No.1 maps to pin C1-25 on the AEM ECU. I have read all about the VSS signal and the problems with it going through the Odometer. My speedometer works fine. I have depinned both the pink wire and...