dustin
UAIOE
I have had a vehicle engine compression test done on a car we are thinking of purchasing used. The car is a 1996 AUDI A4 2.8L V-6. The seller stated the mechanic which looked at it today said 5 cylinders were between 120 and 115. I take that as an average of 118.
BUT there was one cylinder which had a reading of "90ish". The mechanic told the seller each cylinder should be around 100.
The seller is supposed to be faxing me the results today so I can have the exact numbers shortly but the nubmers I have are what the buyer told me.
I asked a buddy and he said I should take the average of 5 cylinders (118) then get 25 percent of that (29.5) and take the low number cylinder (90) and subtract the low number cylinder from the average of the other cylinders and it shouldnt be OVER the 25 percent.
Does anyone agree this is a good method to determine if the engine compression is correct? Or is there a better way?
I'm curious as to if it matters depending on the manufacturer or if there is a general rule of thumb.
I've been on audiworld.com and havent found any specs yet as to what the engine compression readings should be.
BUT there was one cylinder which had a reading of "90ish". The mechanic told the seller each cylinder should be around 100.
The seller is supposed to be faxing me the results today so I can have the exact numbers shortly but the nubmers I have are what the buyer told me.
I asked a buddy and he said I should take the average of 5 cylinders (118) then get 25 percent of that (29.5) and take the low number cylinder (90) and subtract the low number cylinder from the average of the other cylinders and it shouldnt be OVER the 25 percent.
Does anyone agree this is a good method to determine if the engine compression is correct? Or is there a better way?
I'm curious as to if it matters depending on the manufacturer or if there is a general rule of thumb.
I've been on audiworld.com and havent found any specs yet as to what the engine compression readings should be.