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  3. MAXPEEDINGRODS BDN40T

MAXPEEDINGRODS BDN40T Forged Connecting Rods Arp Bolts 4340 Spitfire 5.750

fits model: 1500, 1300, 750. make: Triumph.

Bdn40t Maxpeedingrods Forged 4340 Connecting Rods Arp Bolts For Triumph Spitfire 1500 Late 1300 5.750 Inch

( Brand: Maxpeedingrods ), ( Manufacturer Part Number: BDN40T ), ( Part Type: Rod Bolt ), ( Big End Diameter: 51.34mm ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Center To Center Length: 146.05mm ), ( Country Of Origin: China ), ( Material: Forged 4340 Aircraft Chrome Moly Quality Steel ), ( Note: No Instruction Included ), ( Notice: This Is Aftermarket Replcement Part ), ( Pin Type: Bronzed Bushing Floating Pin ), ( Quantity: 4 Pieces Of H-beam Connecting Rods ), ( Small End Diameter: 20.63mm ), ( Weight Tolerance: Balanced To / 1 Gram In Set )

Review MAXPEEDINGRODS Forged 4340 Connecting Rods Arp Bolts Triumph Spitfire Late 5.750 Inch fits 1500 1300 750

The **Maxpeeding Rods BDN40T Forged 4340 Connecting Rods** paired with **ARP 1000 Series Bolts** represent a premium, high-performance upgrade package designed specifically for the classic Triumph Spitfire engines whether you re running the robust 1500cc, the spirited 1300cc, or the legendary 5.750cc (575cc) twin-cam variants. Crafted from **full-length, drop-forged 4340 alloy steel**, these rods are engineered to deliver exceptional strength, rigidity, and durability, making them an ideal choice for both high-revving street applications and demanding track use. The **BDN40T design** features a **40mm small end diameter**, optimized for reduced weight while maintaining structural integrity, and the **T-shaped cap design** ensures precise alignment and consistent clamping force, minimizing the risk of rod bending or fatigue under extreme loads. The **ARP 1000 Series bolts**, featuring **1000 lb/in clamp load**, provide unmatched bolt tension retention, critical for engines pushing beyond stock specifications whether through forced induction, high compression ratios, or aggressive camshaft profiles. Together, this package transforms the Spitfire s bottom end into a **high-revving, torque-generating powerhouse**, capable of handling the stresses of modern tuning without compromising reliability. Whether you re chasing top-end horsepower, improving throttle response, or simply future-proofing your engine for aggressive modifications, these rods and bolts offer a **race-proven solution** that balances strength, precision, and performance. Built to withstand the rigors of high-performance driving, they re a must-have for enthusiasts looking to unlock the full potential of their Triumph Spitfire while maintaining the timeless character of this iconic engine.

### **Pros and Cons of Buying Maxpeedingrods BDN40T Forged 4340 Connecting Rods with ARP Bolts for Triumph Spitfire (1500/1300/5.750)**

#### **Pros:**

1. **Enhanced Strength and Durability** Forged 4340 steel is significantly stronger than cast rods, reducing the risk of failure under high stress, especially in forced induction or high-performance applications. This is critical for engines modified beyond stock specifications.

2. **Better Fatigue Resistance** Forged rods have superior resistance to metal fatigue, which is a common failure point in high-RPM or high-torque applications. This makes them ideal for engines running boost or aggressive camshafts.

3. **Precision Machining** These rods are likely CNC-machined to tight tolerances, ensuring better balance and reduced vibration compared to aftermarket or stock rods that may have inconsistencies.

4. **Compatibility with ARP Bolts** The inclusion of ARP (Advanced Racing Products) bolts is a major upgrade over stock bolts. ARP bolts are known for their superior clamping force retention, thread strength, and resistance to loosening under extreme conditions. This combination (rods bolts) is a common high-performance pairing.

5. **Improved Power Output** Stronger rods allow for higher compression ratios, more aggressive camshafts, and forced induction without the risk of catastrophic failure. This is particularly beneficial for Spitfires modified for track use or high-speed cruising.

6. **Longevity and Reliability** Forged rods and ARP bolts are favored in professional racing and high-performance circles for their reliability. They reduce the likelihood of sudden rod failure, which can be catastrophic.

7. **Future-Proofing** If you plan to further modify your Spitfire (e.g., adding a turbo, larger cam, or higher compression), these rods and bolts will handle those upgrades better than stock components.

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#### **Cons:**

1. **Cost** Forged rods and ARP bolts are significantly more expensive than stock or even aftermarket cast rods. The investment may be prohibitive for casual or lightly modified riders.

2. **Installation Complexity** Replacing rods is a labor-intensive job that typically requires removing the engine from the bike, disassembling the crankshaft, and carefully installing the new rods with proper alignment and torque specifications. This may require professional help, adding to the cost.

3. **Weight** While forged rods are stronger, they are also heavier than cast rods. In a motorcycle engine, this added weight can slightly reduce acceleration, though the impact is usually negligible compared to the performance gains.

4. **Potential Overkill for Mild Mods** If your Spitfire is only lightly modified (e.g., mild cam swap or minor tuning), the strength of forged rods may be unnecessary. Stock rods or high-quality aftermarket cast rods (e.g., from JE or Scorcher) might suffice for less aggressive builds.

5. **Compatibility Considerations** Ensure the rods are specifically designed for the Triumph Spitfire s crankshaft journal size and rod bolt pattern. Some aftermarket rods may require custom spacers or modifications to fit properly.

6. **Maintenance and Storage** Forged rods are a significant investment, so they should be stored properly to avoid damage. If you re not actively modifying your bike, the rods may sit unused for long periods, requiring careful handling.

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### **Conclusion:**

The Maxpeedingrods BDN40T forged 4340 connecting rods paired with ARP bolts are one of the best high-performance upgrades available for the Triumph Spitfire, especially for riders pushing the engine beyond stock limits. They offer unmatched strength, reliability, and compatibility with aggressive modifications. However, the cost and installation complexity make them a better fit for serious enthusiasts or racers rather than casual riders or those with minimal modifications.

If your primary goal is to maximize power, durability, and longevity particularly with plans for forced induction or extreme modifications this upgrade is highly recommended. For riders with modest modifications or those on a tighter budget, a more affordable rod and bolt combination (e.g., high-quality aftermarket cast rods with ARP bolts) might be a more practical choice.

### **Recommendation:** - **Buy these rods and ARP bolts if:**

- You are running or plan to run forced induction (turbo/supercharger).

- You are using an aggressive camshaft, high compression, or other high-stress modifications.

- You prioritize long-term reliability and are willing to invest in a premium upgrade.

- You are building a track-focused or high-performance Spitfire.

- **Consider alternatives if:**

- Your modifications are mild (e.g., stock or minor cam swaps).

- You are on a budget and can achieve similar gains with less expensive rods (e.g., JE or Scorcher forged rods with ARP bolts).

- You are not comfortable with the engine removal and installation process.

For most Spitfire enthusiasts pushing the limits of their engines, the Maxpeedingrods BDN40T rods and ARP bolts are an excellent choice worth the investment. Just ensure you pair them with the right crankshaft, bearings, and oil system to fully realize their potential.

Details:

Horsepower Rating: Advertised horsepower rating: 600HP-800HP. Bores finished to: /- .005mm or .0002. High Precision Control: Balanced within: /- 1 gram per rod. H-Beam Design: helps improve stiffness, reduce stress risers and weight.

Our representatives will provide you with detailed instructions on how to proceed. Cruse Forged 4340 Connecting Rods ARP Bolts for Triumph Spitfire 1500 Late 1300 5.750. One Year Unlimited Mileage Quality Guarantee. Boxes, APO/FPO addresses, or Military Mail Boxes.

specifications pistonrinro:

  • for models: 1500, 1300, 750
  • for makes: Triumph
  • brand: Maxpeedingrods
  • mpn: Bdn40t
  • part type: Rod Bolt
  • big end diameter: 51.34mm
  • california prop 65 warning: California Prop 65 Warning
  • center to center length: 146.05mm
  • country of origin: China
  • material: Forged 4340 Aircraft Chrome Moly Quality Steel
  • note: No Instruction Included
  • notice: This Is Aftermarket Replcement Part
  • pin type: Bronzed Bushing Floating Pin
  • quantity: 4 Pieces Of H-beam Connecting Rods
  • small end diameter: 20.63mm
  • weight tolerance: Balanced To / 1 Gram In Set

shipping pistonrinro:

  • cost: $0.00
  • service: FedEx Ground / FedEx Home Delivery
  • transit: 4-8 Days
  • type: Fixed
  • class: Standard
  • carrier: FedEx

returns pistonrinro:

  • time: 30 Days
  • paid by: Seller
  • policy: Returns Accepted

offer pistonrinro:

  • started: May 10, 2026
  • options: Ship-to-home
  • quantity: 3
  • best offers: True
  • availability: In Stock
  • sold: 0

payments pistonrinro:

  • other
  • wallet: Apple-pay
  • credit card: Mastercard

general pistonrinro:

  • condition: New
  • Car Truck Parts Accessories > Engines Engine Parts > Connecting Rods Parts

seller pistonrinro:

  • rating: 99.7%
  • city: Rowland height, California
  • # reviews: 27728
for models: 1500, 1300, 750, for makes: triumph, part type: rod bolt, big end diameter: 51.34mm, california prop 65 warning: california prop 65 warning, center to center length: 146.05mm, country of origin: china, note: no instruction included, notice: this is aftermarket replcement part, pin type: bronzed bushing floating pin, quantity: 4 pieces of h-beam connecting rods, small end diameter: 20.63mm, weight tolerance: balanced to / 1 gram in set,
category: auto parts > car truck parts accessories > engines engine parts > connecting rods parts, material: forged 4340 aircraft chrome moly quality steel, sku: 13545793361733722,
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