8V Head Blacktop VS Early Silvertop - Saxperience

Aksel · 28th March 2011, 17:15

Hi there!

I have a VTR mk2 with a early silvertop engine (90hp), and i have just bought a ported head from blacktop engine but will it fit?

First of all i would like to know what are the differences between the blacktop head and the silvertop? I know the blacktop has nonroller valve rockers and uses different cam bearings. It also haves stronger valve springs. But are there any more differences?

Will the blacktop head fit the early silvertop engine block (90hp)? I have read some where the blacktops have dished pistons and the silvertop doesnt...

If it fits how much would have to be changed? I know the inlet manifold will fit but what about the coilpack and the injectors? And what about the thermostat housing?

Any help is much appreciated!

Stevo123 · 28th March 2011, 19:58

AFAIK 90bhp engines are interchanagble between black and silver but the later MK2 98bhp haave differnet port spacing. You should be okay to swap in other words.

Aksel · 29th March 2011, 15:35

Ok, super thanks alot! But would really like someone who has actually done it to confirm it?

AXracing · 29th March 2011, 20:27

The black top is a different casting then the early silver tops with a altered combustion shape.

Aksel · 30th March 2011, 16:09

Yes i can tell the castings are different.
How is the combustion shape different? Is it bigger? Will i still be possiable to fit the head?

Aksel · 2nd April 2011, 10:07

Bump! Anyone?

jeffchiz · 2nd April 2011, 12:05

i fitted a rallye head to my early silvertop which is old blacktop head and it bolted on never got the car running right but i think that was more down to me not wiring up the rallye inlet right/getting the timing wrong when i did the cambelt

stevo1600 · 2nd April 2011, 13:23

could you gain 8 brake by putting on the silver top head onto a blacktop engine??

jeffchiz · 2nd April 2011, 13:25

Quote:

Originally Posted by stevo1600

could you gain 8 brake by putting on the silver top head onto a blacktop engine??

no, theres other differences between the 90 and 98 bhp engines, otherwise he'd loose 8bhp by fitting a black top to his silver top

stevo1600 · 2nd April 2011, 13:29

ah ok;d i didnt realise he was putting the blacktop head on.

Aksel · 3rd April 2011, 11:32

ok thats great thanks for confirming!
Didt you use the early silvertop ecu and loom? If so did the coilpack and injectors fit straight on?
And what about the thermostat housing? Will the silvertop fit the blacktop head?

Aksel · 6th April 2011, 21:32

Bump!
do the the coilpack and injectors fit straight on?
And what about the thermostat housing? Will the silvertop fit the blacktop head?