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Honda K20 K24 Alternator Underdrive Pulley 40%
£84.00
£70.00
Honda K20/K24 Underdrive Alternator Pulley 40% - Black
The T7Design Alternator Underdrive Pulley increases performance by reducing the force needed to overcome the inertia of the alternator during acceleration and gear changes, this will result in a snappier throttle response and more horsepower reaching the wheels.
Alternators, in general, have a broad generating power band with the Honda K20 alternator producing a reasonable output from just 1,500 rpm, with max output being produced from 4,000 to 18,000 RPM, with this latter figure technically being the maximum warrantied rev limit. In some applications, where the engine is spending most of its time in the upper half of its rev range, you simply do not need to drive the alternator at such a high speed. However, the only issue you would potentially face is a lower output at idle, in which case you may need to increase the idle speed to ensure the alternator is producing more current than is being consumed by the vehicles electrical systems. An underdrive pulley should also be considered if you have raised your rev-limit of your engine, for example if it is now 10% higher we would recommend fitting a 10% underdrive alternator pulley and so on.
FEATURES & BENEFITS
- Underdrives the alternator pulley to free up additional Horsepower.
- Hard anodised black for superior finish, corrosion resistance and wear resistance.
- Precision machined to very tight tolerances.
- Almost half the weight of the OEM steel pulley.
| Specification | Metric | Imperial |
| Weight - 10% Underdrive | 0.145 kg | 0.319 lbs |
| Weight - 20% Underdrive | 0.175 kg | 0.385 lbs |
| Weight - 30% Underdrive | 0.177 kg | 0.390 lbs |
| Weight - 40% Underdrive | 0.203 kg | 0.477 lbs |
| Weight - Stock Steel Pulley | 0.275 kg | 0.605 lbs |
| Construction | Billet 6061-T6 Aluminium | |
| Finish | Hard Anodised Black | |
| Manufacturer | T7Design | |
| Part Number | A91-3E1-EA3 | |
ATTENTION
- It is recommended to use an impact gun to remove the original alternator pulley.
- Fits both models of Honda K20/K24 alternator.
- For road applications we would not recommend going less than the 10% underdrive pulley, any less and you may find the OEM alternator cannot provide enough charge at idle with all electrical accessories turned on.
| Manufacturer | T7Design |
|---|
Shipping Information & Charges
VAT is included on the UK prices below, no VAT is applicable on ROW prices.
European Customers: We offer a next working day delivery service to most European countries, please get in touch for pricing.
ROW Customers: If you would like a more accurate shipping quote or a faster service via DHL please get in touch with your requirements.
Please note Orders to EU and Rest of the World - VAT and customs duties may be payable on delivery.
United Kingdom & Northern Ireland
| Mainland | ||
| Service | GBP 0 - 50 (inc VAT) | GBP 50+ (inc VAT) |
| RM Second Class | 3.60 | Not Available |
| RM First Class | 4.92 | Not Available |
| DPD Next Working Day | 8.00 | 8.00 |
| DHL UK Next Working Day | 9.95 | 9.95 |
| DPD Next Working Day by 12am | 13.60 | 13.60 |
| DPD Saturday All Day | 15.00 | 15.00 |
| DPD Saturday by 12am | 32.02 | 32.02 |
| DPD Sunday All Day | 19.50 | 19.50 |
| Scottish Highlands & Islands, Channel Isles, Scilly Isles, Isle of Wight | ||
| Service | GBP 0 - 50 (inc VAT) | GBP 50+ (inc VAT) |
| RM First Class | 4.20 | N/A |
| DPD / DHL Two Day | 17.30 | 17.30 |
| Isle Of Man | ||
| Service | GBP 0 - 50 (inc VAT) | GBP 50+ (inc VAT) |
| DHL Two/Three Day | 18.00 | 18.00 |
Europe
DHL Tracked Delivery. Approx 2 - 7 days depending on distance from the UK.
| Country | Cost in GBP |
| AUT - Austria | 35.00 |
| BEL - Belgium | 35.00 |
| BIH - Bosnia and Herzegovina | 50.00 |
| BGR - Bulgaria | 45.00 |
| HRV - Croatia | 35.00 |
| CZE - Czech Republic | 35.00 |
| CHE - Switzerland | 42.00 |
| CYP - Cyprus | 75.00 |
| DNK - Denmark | 35.00 |
| EST - Estonia | 40.00 |
| FIN - Finland | 40.00 |
| FRA - France | 35.00 |
| DEU - Germany | 35.00 |
| GIB - Gibraltar | 46.00 |
| GRC - Greece | 40.00 |
| HUN - Hungary | 40.00 |
| IRL - Ireland | 25.00 |
| ISL - Iceland | 80.00 |
| ITA - Italy | 35.00 |
| JER - Jersey | 30.00 |
| LVA - Latvia | 46.00 |
| LTU - Lithuania | 45.00 |
| LUX - Luxembourg | 35.00 |
| NLD - Netherlands | 35.00 |
| NOR - Norway | 45.00 |
| POL - Poland | 39.00 |
| PRT - Portugal | 35.00 |
| ROU - Romania | 45.00 |
| SRB - Serbia | 45.00 |
| SVN - Slovenia | 35.00 |
| SVK - Slovakia | 35.00 |
| ESP - Spain | 35.00 |
| SWE - Sweden | 49.00 |
Rest Of World
Below are the most popular countries we ship to world-wide. If your country is not listed please get in touch for a quote.
DHL Express: We offer shipping via DHL, please get in touch for pricing and more information on their Worldwide 2-7 day services.
| Country | Cost in GBP |
| ARG - Argentina | 175.00 |
| AZE - Azerbaijan | 75.00 |
| BN - Brunei | 75.00 |
| BRA - Brazil | 95.00 |
| CAN - Canada | 72.00 |
| HKG - Hong Kong | 80.00 |
| IDN - Indonesia | 75.00 |
| ISR - Israel | 95.00 |
| JAM - Jamaica | 50.00 |
| JPN - Japan | 70.00 |
| KEN - Kenya | 60.00 |
| KOR - South Korea | 80.00 |
| KWT - Kuwait | 85.00 |
| MLT - Malta | 58.00 |
| MYS - Malaysia | 50.00 |
| QAT - Qatar | 80.00 |
| ZAF - South Africa | 74.00 |
| KOR - South Korea | 70.00 |
| THA - Thailand | 55.00 |
| PRY - Paraguay | 150.00 |
| SAU - Saudi Arabia | 130.00 |
| SGP - Singapore | 90.00 |
| TWN - Taiwan | 95.00 |
| TUR - Turkey | 70.00 |
| UKR - Ukraine | 140.00 |
| By Order Value: | GBP 0 - 149.99 | GBP 150 - 399.99 | GBP 400+ |
| USA - United States of America | 35.00 | 70.00 | 130.00 | US - Puerto Rico | 90.00 | 165.00 | 165.00 |
| BHR - Bahrain | 45.00 | 75.00 | 75.00 |
| NZL - New Zealand | 60.00 | 125.00 | 195.00 |
| KAZ - Kazakhstan | 80.00 | 150.00 | 150.00 |
| KGZ - Kyrgyzstan | 80.00 | 150.00 | 150.00 |
| By Order Value: | GBP 0 - 50 | GBP 50 - 120 | GBP 120+ |
| AUS - Australia | 40.00 | 60.00 | 80.00 |
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