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.
After I have installed all the new seals, BCsprings, retainers, locks and buckets,
with T-belt off, put crank at -10 btdc so all pistons are slightly down, install new BC 272 cams, install cam gears, torque cams as per manual. Then turn CAMS clockwise to tdc notches, and than turn CRANK to tdc...
Recently acquired a rhd supra and slowly starting the process of swapping things over. Got myself some glass headlights and wanted to swap bulbs while I’m at it. Been told jdm lights differ from usdm. Hard finding more info on this. Thoughts? Trying to find a quality hid system, seems LED isn’t...
Just installed a pair of S2 taillights on my 93 Supra RZ. I would like to convert to LED. I would like to purchase from here as the prices seem very good.
According to my search in the Forums, looks like I need 2 x 7440 and 2 x 7443 bulbs Just not...