Product successfully added to your shopping cart
Quantity
Total
There are 0 items in your cart. There is 1 item in your cart.
Total products
Total shipping To be determined
Total
RENAULT - Reinforced engine parts
Manufacturers
RENAULT - Reinforced engine parts
Warning: Last items in stock!
New product
Set of 8 trimetal connecting rod half-bearings with tangs for Renault F1N, F3P, F3R, F4R, F7P, F7R (Ø 48 mm).
The F7P (1.8 litre 16-valve), F7R and F4R (2.0 litre 16-valve) power the Renault 19, Clio and Mégane, including the Williams and RS versions. The F1N, F2N, F3N, F3P and F3R (1.7 to 2.0 litre, 8-valve) appear in the same ACL and King application lists. ACL and King list the same bearing set for these engines: a single set covers the family. The bearings are supplied with a locating tab.
From the factory, these engines are fitted with standard production connecting rod bearings, sized for the loads of the original engine: as soon as power, engine speed or boost pressure increase, they reach their limits.
A trimetal bearing stacks three layers: a steel back, a copper-lead intermediate layer with high load capacity and an anti-friction running surface that protects the journal. The complete set contains 8 half shells, four pairs for a four-cylinder engine.
The original bearing relies on an aluminium alloy over a steel back, intended for low to medium loads, whereas trimetal is designed for high, sustained loads: an aluminium bi-metal takes around 8,000 psi, a performance trimetal up to 12,000 psi, 50% more. Hence better resistance and better durability on turbocharged, supercharged and high-revving engines.
| ACL / King bearings Crankpin Ø 48.000 / 48.020 mm Housing bore Ø 51.587 / 51.600 mm Width 20.5 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 4B7820H-STD | ACL Race - Untreated | Standard | 1.768 |
| 4B7820HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.755 |
| 4B7820H-.25 | ACL Race - Untreated | +0.25 | 1.893 |
| 4B7820H-.50 | ACL Race - Untreated | +0.50 | 2.018 |
| CR4019XP | King Racing - Untreated | Standard | 1.766 |
| CR4019XP STDX | King Racing - Untreated | Std, increased clearance (STDX) | 1.753 |
| CR4019XP0.25 | King Racing - Untreated | +0.25 | 1.893 |
| CR4019XP0.5 | King Racing - Untreated | +0.50 | 2.02 |
The running clearance is the gap between the bearing and the journal where the oil film flows.
In operation, the crankshaft journal does not rub against the bearing: it rides on this oil film, which carries the load. Clearance sets the thickness of this film: too tight, oil flows poorly, temperature rises and the risk of seizure increases; too loose, oil escapes, the film loses load-carrying capacity and oil pressure drops. The right clearance is the balance between adequate lubrication and a well-maintained oil film.
| Size / grade | When to choose it | ACL Race Series | King XP |
|---|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.051 to 0.061 mm | 0.048 mm |
| Increased clearance (HX / STDX) | Wider clearance: high oil flow, high rpm | 0.076 to 0.086 mm | 0.073 mm |
| +0.25 / +0.50 mm | Journal reground to 0.25 / 0.50 mm | 0.051 to 0.061 mm | 0.048 mm |
Checking on assembly: lay a calibrated strip (Plastigauge) on the journal, torque the rod cap to spec, then compare the crushed strip against the gauge to read the clearance.
The ACL and King rod bearings shown here are trimetal bearings, designed for engine building and racing. Compared with an original bearing, they handle far higher loads: they cope with increased power, high rpm or the addition of a turbo or supercharger, where a standard bearing quickly reaches its limit.
 | ACL Bearing Company, an Australian manufacturer of high-performance engine bearings since 1949, offers with its Race Series precise trimetal bearings, available in many sizes and proven on built engines worldwide. |
 | King Engine Bearings, an Israeli manufacturer of high-performance engine bearings since the 1960s, offers with its pMax Black trimetal alloy bearings designed for heavy loads. |
| Criterion | ACL Race Series | King Racing |
| Cross-section |  |  |
| Type | High-performance trimetal bearing | High-performance trimetal bearing |
| Country of manufacture | Australia | Israel |
| Construction | Trimetal: steel back, copper layer, soft surface | Trimetal: steel back, copper layer, soft surface |
| Alloy | Race Series (copper-lead) | pMax Black (hardened copper-lead) |
| Protective coating | No | No |
| Available sizes | Standard to +0.50 mm (+ increased clearance HX) | Standard to +0.50 mm (+ increased clearance STDX) |
This connecting rod bearing set fits the F7P, F7R and F4R engines of the following Renault models:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| RENAULT | 19 1.8 16V | F7P | 135 hp | 1989–1996 |
| RENAULT | Clio 1 1.8 16V | F7P | 135 hp | 1991–1996 |
| RENAULT | Clio Williams | F7R | 147 hp | 1994–1998 |
| RENAULT | Mégane 1 2.0 16V | F7R | 147 hp | 1996–2003 |
| RENAULT | Clio 2 RS | F4R | 172 hp | 2000–2004 |
| RENAULT | Clio 2 RS | F4R | 182 hp | 2004–2009 |
| RENAULT | Clio 3 RS | F4R | 197 hp | 2006–2012 |
| RENAULT | Clio 3 RS | F4R | 200 hp | 2008–2014 |
| RENAULT | Mégane 2 RS | F4R | 225 hp | 2004–2009 |
| RENAULT | Mégane 3 GT | F4R | 220 hp | 2012–2016 |
| RENAULT | Mégane 3 RS | F4R | 250 hp | 2009–2015 |
| RENAULT | Mégane 3 RS Trophy | F4R | 265 hp | 2008–2016 |
| RENAULT | Mégane 3 RS Trophy R | F4R | 273 hp | 2014–2016 |
