Lotus Esprit V8 Cylinder & Coil Pack Diagram with Compression Test Results
Hand-drawn cylinder and coil-pack schematic with a table of before/after compression test values per cylinder.
This document is a printed cylinder identification and coil pack wiring diagram for a V8 engine (viewed from the flywheel side), sourced from a LotusTalk forum attachment and printed 5/4/2018, heavily annotated with handwritten compression test results. The printed portion shows the layout of cylinders 1–4 on Bank 1 and 5–8 on Bank 2, plus the terminal arrangement of Coil Pack #1 and Coil Pack #2 (terminals 5, 8, 2, 3 over 7, 6, 4, 1) relative to the front of the engine. A second printed view shows the engine block from the front with cylinder positions. Handwritten annotations record compression readings for all eight cylinders both "before" and "after" (apparently before and after some repair or treatment), listing both the reading at 5 revolutions and the maximum value. Before values ranged from 117–138 psi (max 130–140); after values improved to 135–145 psi (max 145–155). Cylinder 6 was the weakest before (117/130) and improved to 135/145. A reader can learn cylinder numbering, bank identification, coil pack terminal assignments, and see a real-world compression test comparison for this engine.
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Frequently asked questions
- How are the cylinders numbered on this V8 diagram?
- Viewed from the flywheel side, Bank 1 contains cylinders 1–4 and Bank 2 contains cylinders 5–8, with the coil packs mounted between the banks toward the front.
- What is the coil pack terminal arrangement shown?
- The two coil packs (Coil Pack #2 on the left, Coil Pack #1 on the right, with FRONT between them) have terminals arranged 5, 8, 2, 3 on the top row and 7, 6, 4, 1 on the bottom row.
- What were the compression readings before the work?
- Before: cyl 1 = 120 (max 135), cyl 2 = 138 (140), cyl 3 = 135 (140), cyl 4 = 135 (140), cyl 5 = 125 (140), cyl 6 = 117 (130), cyl 7 = 125 (130), cyl 8 = 126 (130), measured at 5 revolutions with a max value.
- How much did compression improve after?
- After: cyl 1 = 145 (max 155), cyl 2 = 140 (148), cyl 3 = 145 (155), cyl 4 = 145 (155), cyl 5 = 140 (148), cyl 6 = 135 (145), cyl 7 = 140 (150), cyl 8 = 140 (148) — all cylinders improved by roughly 5–20 points.
- Which cylinder had the lowest compression?
- Cylinder 6 was lowest before at 117 (max 130); after, it read 135 (max 145).
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