Switching to Bike Carbs. Heres a write up!

[YJSAABMAN]

Hey whats everybody with aba set ups running for their jet size?

Yes, please!! Cleaning and freshening of the carbs and building on a throttle cable bracket are close on the list.

[MKIGTITDI]

With my set up im going to try some 175 mains to see if their dialed. 200 are way to big for the aba set up from the counterflow 2l set up.

[Colbskee]

Im planning on running some R1 carbs on my 1.8 8v. What size jet should i start with?

Carbs are off an 01 i believe.

[MKIGTITDI]

Start around 165's if i remember. Anything done to the head? porting big cam ect?

[Colbskee]

head is all stock right now. I plan to get another head and do some porting and valve grind etc. as well as a cam. I want to have it running on the carbs by summer.. :/

[hyperformancevw]

start with whatever your approximate hp is. so if you feel you should be around 160 crank hp, try a 160-165 jet to get you close. The more honest you are with yourself the closer you will be also

[MKIGTITDI]

Yeah I don't know about the jets to crank up. If you watch my videos of my set up when I was running my high cr ABA/JH hybrid I was running 2.00 mains.

[bmxguy]

start with whatever your approximate hp is. so if you feel you should be around 160 crank hp, try a 160-165 jet to get you close. The more honest you are with yourself the closer you will be also

yaaa i dont know about the hp/jet size you stated.

Yeah I don't know about the jets to crank up. If you watch my videos of my set up when I was running my high cr ABA/JH hybrid I was running 2.00 mains.

not to diss your motor but to help prove my point, this aba/jh even with a high CR and a fat cam will only put out 110-120 whp and was using 2.00 main jets. hp to your jet size is irrelevant, each motor is different and will take different jets needle hieghts etc etc between motor and motor. get wideband. dont have the money? narrow band to atleast get a bseline.

[Ajaxpowder]

anybody have ideas for an ignition box that would let me use a crank trigger and individual coil packs?

EDIT: will be using a MSD migit DIS system!

[MKIGTITDI]

not to diss your motor but to help prove my point, this aba/jh even with a high CR and a fat cam will only put out 110-120 whp and was using 2.00 main jets. hp to your jet size is irrelevant, each motor is different and will take different jets needle hieghts etc etc between motor and motor. get wideband. dont have the money? narrow band to atleast get a bseline.

None taken i hope to get onto a dyno with my new set up here soon once its dialed in a little bit. I was kind of using my set up to say i know i was no where close to 200 hp to the crank out of my old set up.

On a side note once i can get the funds together to put together my own custom turbo kit make a plenum ect. for my carb set up im planning on dialling it to the tune a 200whp. From what ive been told with doing that i should end up running about 1.35-1.40 main jets at that point. Look at my build thread.

[Colbskee]

Well.. I bought some Carbs today. Going to start collecting parts.




in this next pic, the choke slider is missing a screw. so far that is the only thing i can see that is missing from these.

[pnavarro]

Finally, a vid from my VW Pointer on R1 carbs.

[YJSAABMAN]

in this next pic, the choke slider is missing a screw. so far that is the only thing i can see that is missing from these.

Not missing anything, they just don't have a screw there. The carb bodies are all the same, they just didn't see a need for one there. My carbs don't have that screw, either, and upon closer inspection the threads don't look like they've ever had a screw in them.

[YJSAABMAN]

Finally, a vid from my VW Pointer on R1 carbs.

Get a windshield for that thing!

[pnavarro]

Get a windshield for that thing!

No!

[funpig]

Love the video... funny my interior looks almost identical minus the broken windshield.

[pnavarro]

Love the video... funny my interior looks almost identical minus the broken windshield.

broken windshield gives it personality!

[YJSAABMAN]

So I was out in the garage looking longingly at my Cabby project the other day and just lookign around to remind myself what all needs addressed yet. While doing this an idea popped into my head, though I'm not sure if it is actually feasible or not.

My eyes fell upon the broken off end on the purge/evap hose back to the fuel tank, and I wondered if connecting the float bowl vents to this might not be the "proper emissions happy" way to do things. Now, my dilemma here is whether or not I'm understanding the purpose of this hose properly. I'm thinking that this hose was used to purge the charcoal canister when an abundance of vapor build-up occurred, releasing it back to the fuel tank. Is this correct? If so, wouldn't it make sense to vent the float bowls back to the tank? Or would this cause a vacuum to form in the float bowl due to the level change in the fuel tank? Isn't there a tank vent in the filler neck/cap to balance that out?

Just some rambling thoughts from a man without enough parts or money, but plenty of time to over think his project.

[86Franklin]

Well my cabby has a return gas line. And you could technically use it, but if your floats are working properly at the right fuel pressure it will never use it. Now if you are running a high pressure pump with a low pressure regulator like the Holley one. You could use one of the two outs to return it to the tank. All in all if everything is working right how its supposed to be it wouldn't be used.

[YJSAABMAN]

My return line is being used with an Aeromotive bypass regulator. I'm talking about the smaller, flexible vent line, the third line back to the tank. I found out it's actually to vent the excess fuel vapors from the tank into the engine to be burned when vacuum conditions, etc are right for it. I've seen some mention of guys running small charcoal canisters from Ducatis to keep them easy to hide away. I'm going to look a little more into what ports do what on the carbs and will prob end up running a small canister of some sort. I plan to do track events and the like with the car, so making sure fuel won't dump everywhere in a worst case scenario is a concern. I'll be sure to keep everyone posted as I figure out more. I haven't gone overboard on my bay shaving, so i still have plenty of original EVAP line holes in the inner fenders to hide things like the factory originally had them.

[86Franklin]

I know what you're talking about I but I don't think I have one and if I do I don't see it anywhere. But I'm sure you could use it for what you are wanting to do. On most carbed motorcycles they just ran vent lines to the bottom of the bike and let it go on the ground if it did.

Edit: I am most familiar with older bikes like 70-80's but I know a 96 zx-6 is the same way.

[YJSAABMAN]

I know what you're talking about I but I don't think I have one and if I do I don't see it anywhere. But I'm sure you could use it for what you are wanting to do. On most carbed motorcycles they just ran vent lines to the bottom of the bike and let it go on the ground if it did.

Edit: I am most familiar with older bikes like 70-80's but I know a 96 zx-6 is the same way.

Oh, hell, my '82 Cabby had an overflow-less radiator setup in it. No expansion tank, it just dumps on the ground.

[pnavarro]

Dudes, I need advice... an acquaintance is asking for help. He has an MkII Jetta, 1.8L and I assume it's an 8 valver. He bought Mikuni BDST 32mm carbs off a Yamaha FZR600... I feel those would be too small... unless you say otherwise.

What can be told to this guy? To buy bigger carbs or to stick with them and drill the hell out of the main jets?

[86Franklin]

Any head work? If not, they would work. but if he plans on doing anything to the engine tell him to at least get 38-40mm carbs.

[pnavarro]

Any head work? If not, they would work. but if he plans on doing anything to the engine tell him to at least get 38-40mm carbs.

I'm still trying to find out what he actually has got, so I'll keep you posted, thanks for the info!

[pnavarro]

Well, he's got 1.8L 8v engine, the guy said he'd be doing a big valve conversion, so I promptly convinced him to switch to the R1 carbs. So, welcome to the Mikuni family!

[86Franklin]

it still probably would've run. but he wouldnt have seen as much well anything, power and torque. lets just say this. the biggest valve tt sells for the 8v is 42mm. that is 10mm larger than the throttle plate on one carb. typically you want it to taper down.

[pnavarro]

it still probably would've run. but he wouldnt have seen as much well anything, power and torque. lets just say this. the biggest valve tt sells for the 8v is 42mm. that is 10mm larger than the throttle plate on one carb. typically you want it to taper down.

So, what you're saying is that the 40's might have been overkill? Slight overkill? or extreme overkill?

[86Franklin]

If he keeps original port size then they will be the same size. From what I understand you want it to taper down from the throttle plate to the valve. Honestly if he's just trying to have a sweet daily 40s will do everything he needs. But if he wants to make as much HP as he can out of this engine I'd say go bigger than 40s.

[pnavarro]

Here's a lil' video, testing the new camera. Enjoy.

[86Franklin]

sounds great! thanks for sharing.

[YJSAABMAN]

Ordered some individual chrome topped K&N filters for my setup, today! 3" diameter body, 2.5" filter element height, and a nice skinny 5/8" flange for the skinny little lip on the carbs. Should be in Monday or Tuesday, then I can test fit and post some pics!

[86Franklin]

Nice. Thinking about buying turbo stuff soon.

[pnavarro]

Nice. Thinking about buying turbo stuff soon.

I'm watching this!

[86Franklin]

Keyword "thinking". I'm up in the air if I want to chip my a6 or build a turbo engine for my rabbit which will obviously cost more