st/bt quads

[stefan]

how do you tell the difference?

i knw the holes on the black top are different

and what are the 2 bore side measuremnts?

[federal]

While both engines have round throttle blade size the blacktop thottle blades are larger at 45mm compared to the 42mm of the silvertop. The casting of the throttle housing is also different as unlike the silvertops round openings the blacktop has more of a heart shape to suit the different manifold (see "Inlet manifold"). The throttle bodies are not readily interchangable as they have different port shapes on the exit and although they would bolt on the airflow would become quite turbulent. The mounting points are also wider apart for the trumpets on the blacktop engine

[stefan]

cheers chris

[rthy]

here you go an article I wrote:

[federal]

^^^its where i grabbed the info from.....

somehow i think people don't bother using search or looking in the faq.....

[rthy]

you know I really should of read your post a little better!

anyway I think many people simply do not know whats in the FAQ section.

[Gilly]

heres one for you Sam

what is the measurement of the inlet to the throttle bodies on both ST and BT?

as in i guess the IDA of the inlet trumpet mounting flange

EDIT: its not a test i am genuinely interested to know this measurement

[rthy]

the answer for that will take untill friday, if I remember I will have it by then

[Gilly]

haha you're a good egg

you use your powers of parts access and i'll use my power of internets and see who wins

[70XIN]

Blacktop: 49.35mm according to my measurements just done then