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1.6L 8v - 807G
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1.6L 8v - 807G
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8740 ARP rod bolt kit replacing the original bolts on the OEM rods of the Renault 807G engine, for the 12 Gordini and the Alpines.
The 807G is the Renault engine for which ARP lists this kit, in the Renault 12 Gordini and the Alpines; the table below follows the application published by ARP.
This kit replaces the original rod bolt of the 807G, whose part number is not published; ARP presents it as a set of M9 x 1 bolts for the R12 Gordini and the Alpines.
Few parts of the bottom end work as hard as the rod bolt: at every revolution, it is what stops the cap from pulling away under the inertia loads of the rod and piston assembly. The original bolt is designed for stock power and is single-use.
The 8740 bolts in this kit are best tightened to the stretch read on a gauge, 0.114 to 0.127 mm; without a gauge, the ARP instruction sheet gives 48.8 Nm. 8740 is a chrome-moly steel that ARP heat treats to 180,000 psi tensile strength, with threads rolled after heat treatment. As a reference point, standard engine fasteners mostly belong to classes 10.9 and 12.9, i.e. 150,800 to 176,900 psi minimum strength. In 8740, these bolts are rated for 9,500 rpm at most (calculated estimate).
| Part number | Brand | Grade / material | Head | Thread | Under-head length |
|---|---|---|---|---|---|
| ARP-116-6001 | ARP | 8740 steel | Not published | M9 x 1 | Not published |
| Reference | Tightening torque | Stretch |
|---|---|---|
| ARP-116-6001 | 48.8 Nm | 0.114 - 0.127 mm |
For this part, ARP favours tightening to a measured stretch, the key to an exact preload; torque is given only when no gauge is available. The figures in the table assume ARP lubricant.
Source of the torque and stretch figures: ARP 116-6001 instruction sheet, in the revision applicable at publication. The manufacturer's instruction sheet prevails in the event of any difference. Read the ARP 116-6001 instruction sheet
The ARP instruction sheet does not require a thread locker for this kit; only ARP Ultra-Torque grease is applied, on the threads as well as under the bolt head.
According to the ARP instructions, the big ends must be checked and resized with the fasteners in place; plan a visit to a machine shop.
With the stretch gauge, you read directly how much the bolt stretches during tightening: the dial gauge sits on both ends of the fitted bolt, and tightening stops when the stretch reaches the value in the table. Friction no longer comes into play, hence a more consistent preload on a heavily stressed engine.
Tightening is done with ARP assembly grease, on the threads and under the head: the torque and stretch figures in the table were established with it.
An engineer with an aerospace background, Gary Holzapfel launched ARP (Automotive Racing Products) in the early 1970s with one goal: to eliminate engine failures caused by weak fasteners in racing. ARP designs and manufactures thousands of part numbers in California, cylinder head, main and rod bolts, in several materials depending on the use, and has become known for the consistency of its manufacturing.
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Renault | 12 (117) 1.6 Gordini | 807G (807.20) | 113 hp | 1970-1974 |
On a Gordini or Alpine engine run at high revs, each rod bolt takes a tension that climbs with engine speed. If one gives way, the rod, the piston and the block are hit at once. Swapping the original bolts for an 8740 ARP kit remains a modest outlay next to a bottom end to rebuild.
