Td42, silver top or blacktop?

[Punderhead]

Hi all

Have searched to no avail.

How do you tell the difference between the blacktop and silvertop motors?

And which of the 2 was put in the gu's?

Cheers

[MudRunnerTD]

Rocker cover is either Silver or Black. The Blacks came out in the later GQs and All the GUs.

The Silver top is the pic though.

[growler2058]

Rocker cover is either Silver or Black. The Blacks came out in the later GQs and All the GUs.

The Silver top is the pic though.

What he said

[Punderhead]

Thanks for that. Just wanted to know what was in my gq.

[happygu]

Both are very strong, but the Silver Top, and later Turbo Black Tops, are stronger. The Silver Top had larger stronger Gudgeon Pins, and heavier pistons, and as such were a little lazier, but handle a bit more boost and modification.

The earlier Black Tops were made slightly lighter internally, to make them a little more refined and car like ( Toyota like )

Mic

[Dales300exc]

Silvertop and N/A blacktop 28mm gudgeons, Factory turbo black top 30mm gudgeons.

Statisically order of strength is:
- Factory turbo blacktop
- Silvertop
- N/A blacktop

[Ben-e-boy]

The only real difference with na black and silver top is the pistons. Many people will tell you that NA black top piston are weak. They are just weaker than the silver top, but they arnt a weak piston..
I have been running more boost on my factory NA blacktop for years now, the majority of that time over 20psi. Now at over 30psi they still havnt cracked.

Edit.... I hope my pistons let go before the crank does anyway, at least I can limp home

[davo82]

I was also told the vac pump is in a different position, silver top are off the alternator and black tops are near injector pump, is this correct or am I being told stories?

[threedogs]

There is a member [sherro] who has just fitted an inport 4.2 in his GQ sounds interesting to me

[Sherro]

I was also told the vac pump is in a different position, silver top are off the alternator and black tops are near injector pump, is this correct or am I being told stories?

Yer Davo the later td's had the vac pump under the ip a good idear i thought till it came time to pull out the ip what a pain in the butt but the sky's the limit when it comes to alternators.

Sherro

[Grease monkey]

Cleared up a few questions I had too.

[threedogs]

are the import 4,2s the same as an aussie specked one

[timmay556]

From my understanding some silvertops (pre change over) had a black rocker cover but the vac pump still ran off the back of the alt