What will let go first in a 300 Tdi?

**Jock The Rock** · 23rd November 2010, 07:20 PM

Gday

As a few know I have a fairly well tweaked 300 Tdi in my Defender

VNT Turbo
Turner Performance Head
Bigger Intercooler
3 Inch exhaust
Diesel Gas
And a tad more fuel than standard

I'm just interested to know what will let go first?

Someone mentioned spinning a big end

I was talking to a Poozer driver on the weekend and he seemed to think the same thing. Apparently Cruisers have a similar problem with the turboed engines

He seemed to think a new set of big ends every 100,000 would be a good idea

Bear in mind I am only running about 18psi at max boost spiking to close to 20psi and rarely going over 700 degrees on the pyro

What are everyones thoughts?

**bee utey** · 23rd November 2010, 07:37 PM

If big ends are an issue I would think checking bearing crush while replacing them would be a good idea. Does anyone do that these days? It's what I learned as a lad, and I'm sure shells loose in the big end would fail.

**Jock The Rock** · 23rd November 2010, 07:42 PM

Originally Posted by bee utey

If big ends are an issue I would think checking bearing crush while replacing them would be a good idea. Does anyone do that these days? It's what I learned as a lad, and I'm sure shells loose in the big end would fail.

Yeh still happens, I did it the other day

I have to whip the sump off to reseal it next service anyway, so I'm tempted to pull a big end off and measure it up

**brianwood** · 23rd November 2010, 09:08 PM

Given 18psi and 700 deg max EGT I would say nothing will "let go".
It is a good idea to replace big-end bearings every 250,000km as a matter of course, regardless of tweeking. Rings every 500,000km.
The gas will help keep the oil clean which has a positive effect on longevity.
Enjoy your tdi. They are a wonderfully robust engine - just dont cook it.

**PAT303** · 23rd November 2010, 09:10 PM

I think it'll do what a stock one will do,everything you have done will make the engine work less for the same performance so it should have a good life span. Pat

**spudboy** · 23rd November 2010, 10:52 PM

I'm going to vote for the cooling system going first .....

**Jock The Rock** · 24th November 2010, 05:54 AM

Originally Posted by spudboy

I'm going to vote for the cooling system going first .....

Yeh it is running hotter

I just sold my boat, so now looking at enlarging the radiator and a bigger intercooler

**uninformed** · 24th November 2010, 08:38 AM

Originally Posted by PAT303

I think it'll do what a stock one will do,everything you have done will make the engine work less for the same performance so it should have a good life span. Pat

ummm I dont really get it???? how can it be doing less to create the same???

1 Hp is 1 HP...which equals X amount of friction/heat etc...he hasnt increased the CC of the engine but its making more power....would that not mean doing more work?

**PAT303** · 24th November 2010, 09:24 AM

When you are driving you don't need to put your foot down as hard,unless you drive everywhere with your foot down hard.Jock,I wound some fuel off when I fitted the D/gas,it now pulls up hills better with only a 20degree increase in EGT's. Pat

**big guy** · 24th November 2010, 01:45 PM

Clutch and brakes will go 1st I would guess.
The rest is just a twaek and you probably know how to look after a motor if you done all that wizardry.

Do oil changes and keep cooling system good.
Oh and your window winders and door locks will probably be next

.

Thread: What will let go first in a 300 Tdi?

Thread Tools

What will let go first in a 300 Tdi?

Bookmarks

Bookmarks

Posting Permissions