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Post by boggissimo on Apr 17, 2024 9:49:07 GMT
Compression test results, engine warmed up first and all plugs out:
| Cylinder 1
| Cylinder 2
| Cylinder 3
| Cylinder 4
| Dry | 150
| 140
| 135
| 140
| Wet | 170
| 165
| 160
| 180
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Minimum compression according to the Haynes manual is 9 bar, so about 130 psi. So none of the cylinders are officially below spec, but quite a long way off the ~190-200 psi that would be expected if it were factory fresh.
Not much difference between the dry and wet tests, and the plugs were very oily, so I think the dry test was not very dry! At least they are all within 10% of each other so head gasket looks OK (I only fitted a new one last autumn). Which leaves piston rings and valve stem seals as potential contributors (or scored bores I suppose).
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Post by boggissimo on May 1, 2024 11:21:14 GMT
Was a bit cheesed off after the MOT and had seen the local club bike MX5 'Ron', a well used H reg 1.6, was up for sale at a great price for club members. I messaged the current custodian and it had already sold (within a few hours) but he said one of our other clubmates had done welding on Ron and it was mint, so I got in touch. He was happy to pick up the car, sort out the rear sills and bring it back for a proper bargain price, so off it went last week. As usually happens with these things, it was worse than it looked from the outside, and the front sills needed doing too, but he sorted them out too and I got the car back yesterday.
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Post by boggissimo on May 1, 2024 11:23:25 GMT
The front wings were rotten on the surface skin too, so I'm painting up the OEM replacements I picked up in recent MX5parts sales and will fit them before it gets tested again.
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Post by boggissimo on May 8, 2024 10:13:52 GMT
Plenty of progress to report: - Extended wiring from original fan switch, to reach new switch in coolant reroute spacer (it had a different thread size, and I couldn't find a single-pin switch that fitted, so got a 1/8NPT switch and an adaptor from 1/8NPT to the M12x1.5 thread in the port)
- Removed original exhaust manifold, and was about to fit a spare OEM one when I was offered a Mazdaspeed manifold nearby, and got a used Cobalt setup for the rest of the system, so I now have a fully fitted (and not bent) exhaust again
- Removed both front wings, they were in quite a state and it was a real pain to get the bolts off at the front where they meet the bumper. The bracket that holds them together had rusted away so there was no way of holding the bolts still to try to undo the nuts, so in the end I had to tin-snip through the wings to get them out of the way and then cut/grind the bolts off. Have got a pair of Jass stainless steel brackets to replace them with
- Painted new front wings, just need to paint the black part at the bottom and then I can try to fit them later
- Returned the rear third brake light wiring to be a brake light, as I'm fitting the rear reversing/fog light bar to the new bumper (tonight's job)
- Booked an MOT for Friday...
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