how hard would it be to swap the 2 barrel carb for a 4 barrel carb and how much would it do for overall performance. im tired of everyone throwing away their a20a1's and going efi, im keeping mine cleaning it up and supercharging, lets be original!
how hard would it be to swap the 2 barrel carb for a 4 barrel carb and how much would it do for overall performance. im tired of everyone throwing away their a20a1's and going efi, im keeping mine cleaning it up and supercharging, lets be original!
right on my friend right on
Im sure you checked the four barrel thread, there is a little bit of R&D but no body has actually ran one yet on here.
I am sure it can be done but getting a streetable car and DD will be a challlange. No more challange than running dual webers though. Holley and carbs designed after Holleys do have some good metering and jetting capabilities now. Of course a wide band will be necessary. Space is a big issue with the four barrel and supercharging.
There are some successful Toyota 4 cyl 4 barrel motors, I believe offenhauser even made an intake manifold for 20/22r yotas at one time.
There has been some Ford 2.3 done too.
Last edited by 2oodoor; 09-17-2008 at 01:17 PM.
You can count on the fact that I won't be going EFI anytime soon.
It's the "if it ain't broke don't fix it" motto. Not to say that I'll be running a keihin anymore either, lol.
My car runs great, gets 26MPG around town no matter how hard I beat on it, and has sufficient,if not breathtaking power. So I'll stay oldschool with a Weber.
I have thought about a supercharger or dual webers or some of the other trick things, but first and foremost mine needs to be reliable and economical. Which it is.
88 LX 5spd l 32/36 weber l KYB GR-2's l Refreshed A20A3 engine l
The good thing about the Weber is you can ease around and run on the idle jets. The Holley will not quite be able to achieve the same MPG I suspect. That is one reason when considering the 2300 series Holley two barrel (looks like a half four barrel) you can expect more raw performance but it would be hard to get the best of both worlds performance and economy, like the webers. BUT a four barrel Holley could concievably be tuned to run more on econonmy on the low end but at Wide Open Throttle you could get the performance end of things. Also when supercharging you would need that extra gas from a four barrel, not to mention they make Holleys just for SC. Again, space a place.. I have BTW noticeed that a lot of Fox body Mustangs have simaler contours of the hood as our Accords. A stock looking hood with a higher rise in the contour could be made to house this stuff.
if anything theres always cutting a tiny hole and getting a scoop made to house whatever will stick out haha with the supercharger im looking for like 10-15lbs bear in mind this a long way of but the a20a1 will blast i can assure you that, imo they sound nicer than the efi's
Originally Posted by chowder
That's one thing I really miss about my old Weber. It sounded way cool. Now I have FI with a B18A1 manifold (LS Integra). It works fine but it has more throttle lag because of the huge plenum and it makes this annoying whistling sound. When I did the conversion I should have used a stock B16 manifold instead. But those are hard to find.
Ahh well. Someday I'll get my ITBs going. And I know those will sound cool.
C|
look for carb superchargers that are for the RX-7's built in the 80's not the newer RX-7.
You can probably ask the guys selling them to fiddle with the drive shaft if you find out that you need it to rotate the opposite way.
- llia
Still sounded way cool this morning too Cygnus
Also remember that any 4bbl should be vacuum secondary, and that the secondary spring might need tweaking.
- llia
hrmm seems like I saw a picture of something related to the title somewhere.... where was that? hrmmm let me think
Some old 4bbl Pics
Keihin base on top of 4bbl adapter
Outline showing Q-Jet throttle bores which do not fit in the current 4bbl adapter - Also showing plenum divider.
The adapter is meant for a Holley not a Q-Jet, but I did see some adapters that have cuts for the Q-Jet, I just need to decide which carb I want to use.
I got another picture that compares the secondary on the keihin to the primary on the Q-Jet.
lol, those two secondary barrels combined could swallow our entire keihin.
The opening up top is the same as on bottom which is the throttle port size of the Keihin secondary, the smaller diameter inside is the Keihin Secondary Venturi diameter.
The Q-JET
The HOLLEY 4160
- llia
The supercharger will be a whole other set of issues, but the 4bbl itself is not hard to swap if you have all the parts and can weld or solder the aluminum. With the carb alone Performance can be great if the carb is setup right. Don't try to force the secondaries to run wide open... let them do their thing, that's why the vacuum secondary and springs will help ensure you're not opening the throttle too much on the secondaries which can cause your carb to be less responsive, possibly going lean from loss of pressure drop across the boosters.how hard would it be to swap the 2 barrel carb for a 4 barrel carb and how much would it do for overall performance. im tired of everyone throwing away their a20a1's and going efi, im keeping mine cleaning it up and supercharging, lets be original!
- llia
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