I'm new to the forum, first post actually. Have owned an 86 N/A Mk2 Diesel Golf for about 4 years. Driven daily. Love the Mk2. Recently acquired an 87 GTI w/ the 16v/ABA block hybrid, serpentine setup with the p/s and A/C deleted. When I went to look at the thing, the seller let me do a compression test as part of the pre-purchase. I talked him down on the price quite a bit afterwards as the pressure readings were inconsistent. I'm wondering if someone can clarify this for me, because while he said he had the swap done in a VW shop near Asheville, NC, he didn't have any paperwork or receipts saved. I was annoyed for sure, but he told me the 16v head has all new lifters, valves, and upgraded camshafts from Techtonics.
Anyway my compression test specs were up near about 200 psi, except for cylinder 3, which was only at 165ish. I did a wet test, and it went up to near 200 psi, so I'm guess the rings are blown on that piston, but can anyone tell me why those readings are so high?? The ABA block was from a low miles 1996, so no forged pistons or squirters. No turbo.
I guess I'm also trying to gauge how long I can just drive the damn thing before I need to start looking for another ABA block or re-ring the one I have, and also if the high compression is in any way unusual. I'm not an expert, obviously, but I'm excited for this project! Thanks in advance for any advice!!