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Lotus Esprit V8 Cylinder Numbering & Coil Pack Diagram with Compression Notes

Hand-drawn diagram of engine cylinder numbering and coil pack wiring with before/after compression readings.

AI caption · Photo 218 of 240

This document is a printed V8 engine reference diagram (sourced from a lotustalk.com forum attachment) showing cylinder numbering and coil pack wiring layout, heavily annotated by hand with compression test results. The left diagram shows a top view of the engine from the flywheel side, identifying cylinders 1–4 on one bank and 5–8 on the other, with the terminal positions of Coil Pack #1 (cylinders 2, 3, 4, 1) and Coil Pack #2 (cylinders 5, 8, 7, 6). The right diagram is an isometric view of the V8 block confirming cylinder numbering relative to the front and flywheel side. Handwritten notes record compression test values for all eight cylinders both "BEFORE" and "After" (presumably before and after some repair or treatment), listing readings at 5 revolutions and maximum values. Before values ranged from 117–138 psi (max 130–140); after values improved to 135–145 psi at 5 revolutions with maximums of 145–180. Annotations include "Bank 1", "Bank 2", "1st start", and per-cylinder max values written next to each cylinder circle. A reader can learn the cylinder/bank layout, coil pack cylinder assignments, and the owner's documented compression improvement across all cylinders.

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Frequently asked questions

Which cylinders does each coil pack serve on this V8 diagram?
Coil Pack #1 connects to cylinders 2, 3, 4 and 1; Coil Pack #2 connects to cylinders 5, 8, 7 and 6, as shown in the top-view wiring layout.
How are the cylinders numbered on this V8 engine?
Viewed with the flywheel side at the rear, one bank is numbered 1–4 (front to rear, annotated Bank 1) and the other bank is 5–8 (front to rear, annotated Bank 2).
What were the compression readings before the repair?
At 5 revolutions: cyl 1=120, 2=138, 3=135, 4=135, 5=125, 6=117, 7=125, 8=124, with noted max values of 135 (cyl 1), 140 (cyl 2), and 130 (cyl 6).
What were the compression readings after the repair?
At 5 revolutions: cyl 1=145, 2=140, 3=145, 4=145, 5=145, 6=140, 7=135, 8=140, with max values ranging roughly 145–180 (mostly 148–155).
Where did this diagram originally come from?
The footer shows a forum attachment URL: ...stalk.com/forums/attachment.php?attachmentid=192139&stc=1&d=1348968632, indicating it was downloaded from a Lotus forum (lotustalk.com).

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