ITB wrap up
Nordschleife Master
Joined: Jan 2009
Posts: 5,609
Likes: 84
From: MA
That's going to run extremely well if you can keep the trumpet openings far enough from the air-box walls for all trumpets. The air box is going to be the key next step, I think.
Nordschleife Master
Joined: Jan 2009
Posts: 5,609
Likes: 84
From: MA
Here's an idea for making the air box. It's an half baked idea and I've never made an air box. However, it might be worth considering. How about buying some women's soft ***** or other ***** like that and slicing segments off them. Then, temporarily attaching those ball segments to the trumpet ends. This way, when you are making the air box, you'll have the minimum clearance right there in a very visual and tangible way taken up by those ball segments. Half baked, but might be worth considering.
Rainman
Rennlist Member
Rennlist Member
Joined: Jan 2007
Posts: 45,844
Likes: 783
From: Nashville, TN
In an intake discussion thread on the 944 side a few years ago an engineer who used to do intakes and cylinder heads at Ford (including the new 5.0) stated that a general rule of thumb for a bell mouth was to imagine it as an ice cream cone with the ball or the scoop of ice cream on top being 1.5 times the diameter of the Bell mouth pipe.
So in Sterling's case with a 50 mm port and probably 50 mm pipe the ice cream should be about 75 mm diameter.
it just happens to be that a tennis ball is almost the perfect size, maybe a little bit small for this, but easily found and cheap. I used tennis ***** for min. Clearance when designing my own velocity stack'd intake plenum last year.
So in Sterling's case with a 50 mm port and probably 50 mm pipe the ice cream should be about 75 mm diameter.
it just happens to be that a tennis ball is almost the perfect size, maybe a little bit small for this, but easily found and cheap. I used tennis ***** for min. Clearance when designing my own velocity stack'd intake plenum last year.
Here's an idea for making the air box. It's an half baked idea and I've never made an air box. However, it might be worth considering. How about buying some women's soft ***** or other ***** like that and slicing segments off them. Then, temporarily attaching those ball segments to the trumpet ends. This way, when you are making the air box, you'll have the minimum clearance right there in a very visual and tangible way taken up by those ball segments. Half baked, but might be worth considering.