Dak-Dak-68 Casual Dubber
26 posts · joined Jun 2009 ·
any information on the pros and cons
T1 dual v single port engines
bajachris88 The international telephone dialing code for Antarctica is 6
6,661 posts · joined Apr 2005 ·
single port = more bottom torque. (smaller port cross sectional area, therefore greater air intake velocity, natural supercharging effect etc)
dual port better top end. (better breathing for high revs)
dual port was initially encorporated for vw's fuel injection implementation and not necessarily any performance increase.
If you can encorporate both with variable intake cross sectional areas (smaller cross section for low rev) then activate a vacuum based actuator to open it up for high revs for large cross section, you can get the best of both worlds. Just like toyota's old fashioned TVIS from the 80's 👍 (had dual intake runners per cylinder, had a rev based valve switch that opened a vacuum canister to operate an actuator which in turn open and closed 1 of the two intake runners on each cylinder when it was required... depending on the rev range of course.)
thats it in a nut shell 🙂
dual port better top end. (better breathing for high revs)
dual port was initially encorporated for vw's fuel injection implementation and not necessarily any performance increase.
If you can encorporate both with variable intake cross sectional areas (smaller cross section for low rev) then activate a vacuum based actuator to open it up for high revs for large cross section, you can get the best of both worlds. Just like toyota's old fashioned TVIS from the 80's 👍 (had dual intake runners per cylinder, had a rev based valve switch that opened a vacuum canister to operate an actuator which in turn open and closed 1 of the two intake runners on each cylinder when it was required... depending on the rev range of course.)
thats it in a nut shell 🙂
(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears. 👍
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta!
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears. 👍
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta!
68AutoBug Beetle Restorer - Experience over 138\% - YIKES --
11,654 posts · joined Aug 2002 ·
Dak-Dak-68 wrote:any information on the pros and cons
I still have My original single port engine in My beetle...
was 1500 now 1600 and I replaced both heads with single ports
I'm very pleased with its performance....
Lee
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- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---