which throttle body will flow more?

General automotive discussion

which throttle body will flow more?

Postby type85 » Thu Jan 26, 2017 10:46 pm

Single throat with 66mm bore?
Or progressive with 34mm primary and 52mm secondary?
How do you calculate surface area? pi x radius squared?

So the area of the 66mm bore is: 3,419sq mm?

34mm primar:y 907sq mm
52mm secondary: 2122sq mm
total: 3029sq mm

I assumed the combination of the two smaller bores would have more area than the single 66mm bore, but the math says otherwise!



User avatar
Posts: 152
Joined: Oct 25, 2014
Location: Los Angeles

Re: which throttle body will flow more?

Postby ChrisAudi80 » Thu Jan 26, 2017 11:06 pm

Looks like you answered your question.
96 S6 auto
Posts: 835
Joined: Mar 2, 2013
Location: Bangkok, Thailand

Re: which throttle body will flow more?

Postby Noisy Cricket » Sat Jan 28, 2017 10:04 am

I'd say the single, the double looks like its angle of approach is WAY too wide. IIRC you don't ever want more than 7 degrees on an inlet or outlet or the flow gets really turbulent.
Pete, that rallycross guy

'06 Volvo S60 R (Swedish GTR)
'84 RX-7 (bridge ported, fuel injected, way modified dirt buggy)
'86 QSW (MC2 goes here. Eventually.)
'81 RX-7 (restoration project)
'73 RX-3 (poor man's Mk2 Escort)
Noisy Cricket
Posts: 196
Joined: Mar 25, 2013
Location: Cleveland, OH

Return to General

Who is online

Users browsing this forum: No registered users and 6 guests