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i am the walrus.
Civic hatch
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Discussion Starter #1
anyone know anything about using carbs on a non-vtec d-series motor? exactly what carbs can be used? how much power can be produced using carbs? thanks
- c303703

i remember Mugen had a 215hp d16a6 with a twin side.
don't really know if it was mikuni weber or whatever brand or what size it was. all i know is, on one of the first crx pages there was a picture of it and underneath it said "215hp mugen engine" and there was a carbed d16 in the pic. - brbHPR
 

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i am the walrus.
Civic hatch
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1,935 Posts
Discussion Starter #2
Hello C,
I know a little too much about carbs. Mikunis, dellortos, webers, and solexes will all work well. I am split between mikunis (tuning simplicity) and weber (tuning flexibilty and precision, availability of parts). I have seen peak power gains of 12-16 percent, and more torque than I care to shake a stick at, when converted from FI. An added plus is the deep thoaty sound of dual carbs...very intoxicating. I hope that helps. Long live the (carb'ed) D-series!


'Bisimoto D15
 

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i am the walrus.
Civic hatch
Joined
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1,935 Posts
Discussion Starter #3
I have a D16A6 motor with honda KinHei Dual carbs.
Running ram pipes and a filter.
Amazing response once i have tuned it and ported and polished the head..4-2-1 FGK manifold and system.
revs to 8000+ rpm without cuttin gout and give b16's a good run to 190KM/H
- bricheun

i don't know if this is normal or even believable but my d15b with stock twin kei hin carbs, 4-1 headers, 2" pipes, Splitfire wires and performance mufflers. could rev up from 8,200 to 9,100 rpm. I can prove it with the tach memory and can run a good 200-210 km/h. Is this normal? or is this some sort of a freak engine? Just wonderin' and not braggin'. - KenMartin
 

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i am the walrus.
Civic hatch
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1,935 Posts
Discussion Starter #4
Yes quite believable.
I can rev to that high too and top speeds off the clock past 190KM in 4th.
Not good for the engine but hell it scares the B16s - bricheun
 

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i am the walrus.
Civic hatch
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1,935 Posts
Discussion Starter #5
What is your intended purpose for the car? Street or Race? I put dual Mikuni 44s on my 89 CRX SI many years ago. Here are my impressions of the mod.

1. Gas mileage sucked. About 16mpg. This was with good tuning. I had the carbs setup by Russ Collins and tuned at AEM on the dyno.

2. No timing. Without the EFI hooked up, the stock distributor would not advance the timing. I could only get about 19' full advance. To fix this, Russ Collins made a custom adapter to run a dizzy from a 1st gen carb crx so I could use the mechanical and vacuum advance. Now that Elecromotive is in the picture, you can run an HPV3 instead of a dizzy.

3. Carbs did not make dick for power if I ran air filters. The carbs sit so close to the brake booster, you cannot fit a decent size filter. The car ran great with just open velocity stacks, but that was surely sucking up dirt and killing the rings.

4. Best sounding honda motor I ever heard.

5. You can run a huge cam and the motor will idle smooth.

6. The car was very moody depending on the weather. Hot days were especially crappy.

Overall, would I do it again? No! Definitely not on a street car and not even on a race car. ITB EFI is the way to go. Carbs are yesteryear technology.

Steve91SI
 

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i am the walrus.
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Discussion Starter #6
Unlike our friend over here, I attained great mileage from a dual carb set up (27mpg). There are many air filters on the market that do not affect air flow negatively, but enhance the funneling effect based on an efficient velocity stack design. You can run an electronic stock distributor and not resort to the archaic vaccum advance.
Why do I contunue to race with dual carbs? In 1995, I performed translucent-cylinder atomization tests with carbs vs. injection. I had to move the injector approximately 3 feet away from the valvehead to achieve the same atomization of my dual carb set up at 4 inches. None of us can run a 3 foot manifold in the confines of our engine bays, and also take advantage of ideal intake harmonics. In addition, carbs are more cost effective.

'Bisimoto D15
 

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i am the walrus.
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1,935 Posts
Discussion Starter #7
sucking fuel though a booster assembly = killer atomization

-Mista Bone
 
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