What is the heat range rating on this plug?

Here is a comparable heat range chart: https://www.densoproducts.com/learning-center/article/225/heat-range-conversion-chart, obviously this is a 20 plug.

Are these denso (4709) iw20tt spark-plugs delivered "pre-gapped" to the customer?

As in any spark plug (SP) user, you should always check the gap. The same SP could be used in different engines and/or applications. So, BE EXTRA CAREFUL GAPPING these SP because the center electrode is .040 in dia. Will snap off very easily. I put them in a vice with vg light and carefully gap to what I need. I use non-nickel anti-seize on the threads whether the heads are aluminum or CI. Torque to factory specs. Good luck

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Iridium TT Spark Plug - IW20TT - Twin Tip - The Powerful Premium Quality Ultra-Efficient Replacement Plug Fits Fiat Mercedes-Benz Honda MG Nissan Porsche Renault Subaru VW Hyundai Daewoo Lotus

Product ID: 58843717

Details

Brand
Denso
Core material
Iridium
Thread size
14 millimeters
Top material type
iridium
Vehicle service type
Car Van

⚡φ0.4mm Iridium center electrode

🔥Twin Tip design for max power

🔩14mm diameter, 19mm thread length

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VT8719

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Description

⚡ Ignite Performance, Drive with Confidence!

TWIN TIP TECHNOLOGY - Double needle electrode accelerates flame kernel for peak engine power and efficiency.
LASER WELDED DURABILITY - All-around laser welding ensures unmatched reliability under extreme driving conditions.
WIDE VEHICLE COMPATIBILITY - Fits premium brands like Mercedes, Porsche, Honda, VW, and more—upgrade your ride effortlessly.
ELECTROMAGNETIC NOISE SUPPRESSION - Built-in resistor eliminates interference, protecting your vehicle’s electronics.
PRECISION IRIDIUM CENTER ELECTRODE - Ultra-fine 0.4mm tip reduces spark voltage for lightning-fast ignition.

The DENSO Iridium TT IW20TT spark plug features a precision 0.4mm iridium center electrode and a twin tip design that maximizes ignition efficiency and engine power. Engineered with laser welding for durability and a built-in resistor to prevent electromagnetic interference, it fits a wide range of premium vehicles including Mercedes-Benz, Porsche, Honda, and VW. This premium spark plug delivers improved acceleration, fuel economy, and longevity, making it the ultimate upgrade for discerning drivers.

Specifications

ASIN	B00TPUA6I2
Best Sellers Rank	128,860 in Automotive ( See Top 100 in Automotive ) 654 in Car Spark Plugs
Brand Name	Denso
Compatible with Vehicle Type	Car, Van
Core Material	Iridium
Country Of Origin	Japan
Customer Reviews	5.0 5.0 out of 5 stars (11)
EU Spare Part Availability Duration	1 Years
Global Trade Identification Number	00042511047099
Included Components	Iridium TT Spark Plug x1
Item Type Name	Spark Plug
Item Weight	0.07 Kilograms
Manufacturer	DENSO Corporation
Manufacturer Part Number	IW20TT
Manufacturer Warranty Description	2 Year Manufacturer
Thread Size	14 millimeters
Top Material Type	iridium
UPC	042511047099
Unit Count	1.0 Count

Reviews

D**R

Genuine Denso

Great spark plug, I checked these carefully on receipt to make sure they where genuine (as there are a lot of fakes about).

25.07.2025

J**E

After using Denso's iridium tt plugs in my truck and van and getting great results. I found a TT plug with the proper reach, thread and heat range for my GeneRac GP5500, Denso (4709) IW20TT Iridium TT. Really easy starting, very stable with varing loads. You will know you are using a TT plug the first instant the engine starts because it sounds slightly different.

25.12.2020

V**A

Alles wie vom Verkäufer beschrieben und genau so wie erwartet und es mir vorgestellt habe. Beste Empfehlung!

18.08.2024

R**S

All Denson TT plugs are the absolute hands down best...... you will notice a big difference. It gets better and better. It will start burning cleaner...... I now put them in everything.

22.10.2020

M**H

Good Match for my Toyota

23.04.2016

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Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

VT8719

Duties & taxes included

In stock

Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vanuatu.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

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