About spark plugs, Copper electrod, Platinum or Iridium

Some words about spark plugs

Normal cheap ones has copper core in the electrod, plated with something else, for example nickel.

Scotty: platinum can easy run a 100 000 miles.

Scotty: Iridium is 6 times harder than platinum so it last evan longer

Normal is copper base and last about 20 000 miles.

The service book to Starlet says to replace every 45000 km if not Platina or Iridium.

Recommend part according to service manual: NGK BKR5EYA

Which has: Electrode Tip Material: Nickel alloy

Electrode Core Material: Copper

= will not last as long as Platinum or Iridium

Source:

The Best Spark Plugs in the World and Why

https://www.youtube.com/watch?v=cBjdRQf2AoI

Serviceintervall is 45000 km if not platina or iridum. When I changed the sparkplugs I found it was Denso K16R-U.

Now replaced with NGK BKR5EYA

NGK BKR5EYA vs DENSO K16R-U. The old ones were a bit sooty.

Second generation 4EFE Info

4EFE JDM 

”You probably know that the jap-model has the rods of the GT and the Glanza. So it has thicker rods.”

The UK 4EFE has weaker rods.

- https://www.youtube.com/watch?v=IQ8gw8JESYk

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4EFE and 5EFE after 1995 have revised sump of 2.8 liter where the sump goes deeper and therefore oilsump goes deeper = better oiluptake.

(less chance of starvation)

Source: 20:40 

https://www.youtube.com/watch?v=XheFp3Fs8uE

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Magnus Zachariassen: 

"Not all 4efe have the thin rods, 1st Gen 4efe 88hp from the corolla have the thicker 4efte style rods :)"

"And stiffer valve springs"

"You will have a lot of fun on the stock engine with a turbo, around 150hp reliably. You can then just buy forged pistons, rods, arp head bolts, valve springs and fit them to the same 4efe. "

- Matt Berry, https://www.youtube.com/watch?v=XheFp3Fs8uE

"Ive made 165hp reliably on a stock engine for years using a td05 turbo... ive never hit 200hp on a stock engin"

- Matt Berry, https://www.youtube.com/watch?v=XheFp3Fs8uE