dual downdraft carbs

MyClunkyAss12er · Aug 22nd, 2003, 06:48 PM

i jsut had this genius idea (in my mind), take these and an e16 mani. then cut the mani. were it splits into two on each side and weld the mountin braket for those on each end. POOF!!! dual doundrafts. i know id have to fab up the cable and such but all and all i think it might work! sound liek a good idea? i think i mihgt give it a try and be unique

MyClunkyAss12er · Aug 22nd, 2003, 10:01 PM

anyone gonna say somthin?......

Myetball · Aug 22nd, 2003, 10:13 PM

Well, that looks like it would be pretty wild and heeps cheaper than buying aftermarket weber carbs. Even if they need a rebuild it shouldn't run too much.

If you do it make sure you post some pics. The hybrid manifold would be something to see.

WMengineering · Aug 22nd, 2003, 10:55 PM

haha with my new motor i have been thinking of old ideas from my honda...then i just came in and saw this thread...
im thinkin about going to 4 mikunis..i already have them...i need to pull them out of my storage tho and see how they port match up to the ca18de. they are off of old yamaha tt500 dirtbikes...hehe

anyone else ever gone to carbs with the ca18de?
hows effective is it?
what type of setups are there out there?
links?
hehe..ok nuff said/asked for now....

MyClunkyAss12er · Aug 23rd, 2003, 12:10 AM

thanks myet, it would be a bad ass setup and fun as hell to make. ive gone thru the complications and such that might come with doin this and i think its worth it so im gonna go thru with it. i found another set of the same carbs with a better adapter, the throttle cable linkage thing, and they were already rebuilt for under 70

im definatly gonna get those and get started. i just gotta scrape up some funds first. dont i need a different distributer? and also should i get a better fuel pump? my main goal is to get the most hp out of this engine on reg. gas.

fastpakr · Aug 23rd, 2003, 12:16 AM

Why in the world would you want to strip the multiport system of a CA18DE and go back to a carb setup?

MyClunkyAss12er · Aug 23rd, 2003, 12:36 AM

thats what i was thinkin.... if ur lookin to change that shit out go for side draft tb's.

Myetball · Aug 23rd, 2003, 08:32 AM

Quote:

Originally posted by MyClunkyAss12er
dont i need a different distributer? and also should i get a better fuel pump? my main goal is to get the most hp out of this engine on reg. gas.

No need to mess with the distributor. As for the fuel pump, I don't know. That would be a question best answered by blownb310.

WMengineering · Aug 23rd, 2003, 10:07 AM

Quote:

Why in the world would you want to strip the multiport system of a CA18DE and go back to a carb setup?

just another way to tune my man. why do ppl do it on other MPFI's?.....id was also thinking about ITB's except i dont have 4 lying around......

could be we also want to get REALLY HORRIBLE gas milage too!!!!
ever think of that?!!! huh? did'ja?

note: these smilies all suck)

MyClunkyAss12er · Aug 23rd, 2003, 10:24 AM

sweet! horrible gas milage! anoother plus to this project!

jk

fastpakr · Aug 23rd, 2003, 03:35 PM

Independent throttle bodies I can understand. Removing a fuel injection system for any carburetor I can't understand. If the system isn't appropriately compensating for whatever engine changes you've made, consider an aftermarket system (you can do this very cheaply if you're willing to work with something like MegaSquirt). No carb (no matter how well tuned) will beat a properly designed EFI system, and it will suffer when you figure in cold starts, mileage, power at points other than peak HP, etc...

WMengineering · Aug 23rd, 2003, 06:02 PM

Quote:

No carb (no matter how well tuned) will beat a properly designed EFI system, and it will suffer when you figure in cold starts, mileage, power at points other than peak HP, etc...

eh, thats your opinion..ill let you guys know bout the dirtbike carbs after i make the manifold for it.

Crazy-Mart · Aug 23rd, 2003, 10:41 PM

depending on the carbs it should have a pump giving about 15psi of fuel pressure... maybe if you have the right FPR you can run the ca18 pump anyway...

fastpakr · Aug 23rd, 2003, 10:44 PM

In your opinion, how could a carb beat EFI in power? (I really am curious as to your opinion, not trying to slam you).

EFI takes direct measurement of the information required to accurately meter fuel for best mixture under any given circumstance. A carb simply can't do this - you can set it up properly one day, and it will only be close[ the next, and only assuming that temperature, air pressure, etc... are right. The only point where EFI could potentially create a restriction is with a MAF sensor that is too small for the application. It is also more reliable - every function of EFI has an equivalent in a carb, except that with a carb it must be done with moving parts that are constantly affected by moisture, dirty fuel, grit, etc... With EFI, the only required moving parts are the injectors (certainly, sensors do go bad, but it isn't common, and in most cases a sensor/circuit malfunction cannot disable the vehicle).

Myetball · Aug 24th, 2003, 12:42 AM

Wow, this is getting complicated. IMO the carb setup will have two benefits. Removing any restriction in the stock intake, throttle body, or manifold. A quad carb setup will suck mad air. I know for sure the stock CA18DE intake is quite restrictive at the MAFS and throttle body

. Also, the carbs will give him a real snappy throttle response, much quicker than EFI. However, he will probably lose some top end power since the carbs cannot increase the fuel flow when needed at the top end. It depends on how it's tuned.

I'd really like to see this when it's done. Better yet, I'd like to see the look on the referee's faces at the smog check station when he pops the hood