starionc wrote:45 + 45 + 45+ 45 All open at the same time at full noise is 180, at least that's what I told one of my mates hotrod friends..
Actually it's the same as a single 90mm throttle body NOT a 180mm throttle body.
Quad throttlebodies are great for a normally aspirated engine but are a waste of space and effort on a forced induction engine.
It was nice and responsive! And great fun, but that was years ago, time to get back to the starion! V8 people are such fun to wind up though rofl The look on that guys face when I said 180mm of TB, you could just see the cogs turning over in his head LOL
And yes 45mm per valve, but that's got to be better then 1 X 80? Or would that still be 80mm per valve? Ah.............. Now I'm confused :glare:
starionc wrote:45 + 45 + 45+ 45 All open at the same time at full noise is 180, at least that's what I told one of my mates hotrod friends..
Actually it's the same as a single 90mm throttle body NOT a 180mm throttle body.
Quad throttlebodies are great for a normally aspirated engine but are a waste of space and effort on a forced induction engine.
Cheers.
Well....it's not actually.
TT x radius squared = opening area
TT x 22.5x22.5 = 1590
2 off = 1590 x 2 =3180
3180/TT = 1012, square root of 1012 = 31.8mm radius
31.8mm x 2 = 63.6mm diameter
So.....2 x 45mm throttle bodies is equivalent to one 63mm throttle body.
starionc wrote:45 + 45 + 45+ 45 All open at the same time at full noise is 180, at least that's what I told one of my mates hotrod friends..
Actually it's the same as a single 90mm throttle body NOT a 180mm throttle body.
Quad throttlebodies are great for a normally aspirated engine but are a waste of space and effort on a forced induction engine.
Cheers.
Well....it's not actually.
TT x radius squared = opening area
TT x 22.5x22.5 = 1590
2 off = 1590 x 2 =3180
3180/TT = 1012, square root of 1012 = 31.8mm radius
31.8mm x 2 = 63.6mm diameter
So.....2 x 45mm throttle bodies is equivalent to one 63mm throttle body.
Twin 45mm Delorto's They (IMO) are much better the webers, Harder to tune but worth the effort! Never had to re tune them until I changed to the Number 5 cam. It was Coltspeed that tuned them! Spot on!!! Ah the good old days :D
I had another motor that was built and I was told by the owner that spent $3500 on it that it had BALLS!!!! He crashed the car as it was so fast?
I bought the motor off them complete with twin 45mm webers, as I was thinking that my motor was getting a bit tied. The "new fast motor" was not a patch on the old girl :x And was only in my car for that 1 rally!
Not that you could put that down to the webers, the hole thing was just not as good.
We even ran an AVGAS mix in the old motor at 1 rally as we were out of fuel and borrowed some avgas from another crew (like you can give it bak rofl )
Well when the avgas part of the mix got the the motor we were in 4th at speed and the car just took off like it was on boost!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Told that story over a few beers that night :beer :beer
BTW: The standard 45mm weber/dellorto carbs run 38mm choke tubes, and the largest, off the shelf tubes you can buy are 40mm.
I'm currently running a set of motorbike carbies on my 2.6L normally aspirated Sigma wagon ( 4 * 38mm ) and making 99.3kw at the wheels (close to 180hp at the flywheel). They are a CV style carb so when they are fully open, the smallest diameter is 38mm. Hmm.
Also made up a set of quad 42mm throttle bodies for my normally aspirated, High Compression engine (14:1 CR).
Hmmm... is this buy & sell? :D
While OT, the CV's like Mikuni and others are a better choice than Weber's or even Dellorto's.
Will flow a lot more with same diameter...
Yeah I was waiting for some one to say that! Buy and sell & The choke size :)
I don't know how it was done, but the 45's were 45! No chokes??? I don't know or understand how, but they just were. The only time the size changed was the manifold and head port size. They were port matched but not 45mm.
And yes we are a long way from the original post for an L300 MPI :D :D
