Quad Bike Carbs?

fbRXse7en · 02-11-2011, 09:34 PM

I've seen dual, dual Weber 45 DCOE's (for a total of 4, 45mm intakes) on some
7's. Is that over-kill? I ask cuz I see a lot of people using just the Weber 51mm IDA which only has 2 51mm intakes. So how about a set of 4, 41mm down-draft (maybe even smaller) bike carbs, like: Keihin FCR's or Mikuni RS's? Would
they flow enough for: BP'd 12A or a BP'd 4-port 13B?? Where can I find this info in laymen's terms? Thanks.

djmtsu · 02-11-2011, 10:21 PM

I have seen twin Weber 36's or Mikuni's, but a twin 45 would be monster overkill for most applications. Hell, even boosted!

Buggy · 02-12-2011, 07:10 AM

It all depends on your application. I have a 48 IDF on my half bridge 13B and it is almost too small. I have that carb maxed out for flow as far as adjustments go. I was considering going to either a 51 IDA or a dual 40 IDF setup of some sort.

RotorDad · 02-12-2011, 08:14 PM

I also have seen dual 36's & a few set ups using dual 48's. I think Rotary Engineering & Killer Bee Racing had dual IDA manifolds. I have seen Hogan's Racing manifolds with twin IDA's.

diabolical1 · 02-14-2011, 02:02 PM

personally, if i were you, i'd keep it simple and start with a single 51 IDA. it may not flow the most, but it has time on it's side. it's proven! i'm not trying to discourage experimentation, but if you're just starting out on this road, i can tell you that tuning twins requires skill and it's probably not where you want to begin.

however, if you're dead-set on the idea of going with twins, you may want to start with 40s. i would tend to think 36s might be small for bridgeys. i, too, think twin 48s would be overkill, but i honestly don't know.

Fidelity101 · 02-21-2011, 07:55 PM

http://www.rx7club.com/showthread.ph...ghlight=mikuni

PercentSevenC · 02-22-2011, 01:57 PM

I've always thought dual 44 IDFs would be an interesting setup.

02-11-2011, 09:34 PM	#1
fbRXse7en The Newbie Join Date: May 2010 iTrader: (0) Posts: 19 Rep Power: 0	Quad Bike Carbs? I've seen dual, dual Weber 45 DCOE's (for a total of 4, 45mm intakes) on some 7's. Is that over-kill? I ask cuz I see a lot of people using just the Weber 51mm IDA which only has 2 51mm intakes. So how about a set of 4, 41mm down-draft (maybe even smaller) bike carbs, like: Keihin FCR's or Mikuni RS's? Would they flow enough for: BP'd 12A or a BP'd 4-port 13B?? Where can I find this info in laymen's terms? Thanks.

02-11-2011, 10:21 PM	#2
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (10) Posts: 4,043 Rep Power: 21	I have seen twin Weber 36's or Mikuni's, but a twin 45 would be monster overkill for most applications. Hell, even boosted! __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

02-12-2011, 07:10 AM	#3
Buggy I've been Wankeled! Join Date: Apr 2010 Location: Mildmay, Ontario, Canada iTrader: (0) Posts: 260 Rep Power: 15	It all depends on your application. I have a 48 IDF on my half bridge 13B and it is almost too small. I have that carb maxed out for flow as far as adjustments go. I was considering going to either a 51 IDA or a dual 40 IDF setup of some sort. __________________ 1976 Rx-4 hardtop. Half bridge 3B 13B, S5 NA rotors, Renesis e-shaft, stat gears, and bearings, balanced rotating assembly, RE dual weber 36 DCD's 203rwhp 137ft-lbs torque DGRR 2011 3rd place 1974 Rx-4 all original 27,000 miles 1988 Rx-7 TII 320rwhp. DGRR 2012 3rd place

02-12-2011, 08:14 PM	#4
RotorDad Big Ugly Join Date: Apr 2009 Location: Fredericksburg, Va iTrader: (1) Posts: 591 Rep Power: 16	I also have seen dual 36's & a few set ups using dual 48's. I think Rotary Engineering & Killer Bee Racing had dual IDA manifolds. I have seen Hogan's Racing manifolds with twin IDA's. __________________ *Boosted Big Body On 335's* PS3 ID: Rotordad 1986 Mazda RX7 GXL - Street ported 13BT, Haltech, 62mm, ect. 2006 MazdaSpeed 6 - Eagle, Wiseco, Cobb, ect.

02-21-2011, 07:55 PM	#6
Fidelity101 Reliable Source Join Date: Nov 2008 Location: Michigan/Illinois iTrader: (1) Posts: 336 Rep Power: 17	http://www.rx7club.com/showthread.ph...ghlight=mikuni __________________ My Rx-7 Vids

02-14-2011, 02:02 PM	#5
diabolical1 I have radioactive semen Join Date: Jul 2008 Location: in a bottle of Glenfiddich iTrader: (0) Posts: 249 Rep Power: 17	personally, if i were you, i'd keep it simple and start with a single 51 IDA. it may not flow the most, but it has time on it's side. it's proven! i'm not trying to discourage experimentation, but if you're just starting out on this road, i can tell you that tuning twins requires skill and it's probably not where you want to begin. however, if you're dead-set on the idea of going with twins, you may want to start with 40s. i would tend to think 36s might be small for bridgeys. i, too, think twin 48s would be overkill, but i honestly don't know.