TheSamba.com :: View topic - How many of off road cars run with dual carbs?

Tue Nov 17, 2009 1:27 pm

I've been doing a little research on which carb to get for my T-4 motor. Airheads say for an off road car a single carb is better http://www.aircooled.net/gnrlsite/resource/articles/carbs101.htm some say that duals when set up properly are MUCH better. I'm not looking to drag race or run at high rpm's all of the time, so I'm leaning towards a single. But which one? aircooled does have some guide lines but was gonna ask you guys. I'm going to leave it stock for now, but would be enlarging it when the time come to rebuild it. So I'd like to leave that path open. I don't want a carb that I'm constanly have to mess with :shock:

Tue Nov 17, 2009 1:39 pm

you will get srong arguments for both !

IMO for off road a single IDF is a perfect setup, the carb is more protected from flying rocks, dirt, tree branches and any other things that can be flung at it from the rear tires.

Tue Nov 17, 2009 3:27 pm

my single never needs sync'd

Tue Nov 17, 2009 3:53 pm

singles will work better with manifold heat.....

Tue Nov 17, 2009 4:27 pm

thats the hard part, as it is a single on a type 4. manifold heat is hard to come by.

Tue Nov 17, 2009 6:10 pm

dual carbs... my boy Rich had problems all day long running a single mount IDF....(mostly serious dead spots/hesitation), why, he only had half the carbs!

No problems now with the dual webs on a 1776

Tue Nov 17, 2009 6:45 pm

fusername wrote: thats the hard part, as it is a single on a type 4. manifold heat is hard to come by.

With out heat a single will NEVER run right. Duals will give you better performance and do not need heat. Just be sure to use good air filters or build a filter breather box setup.

Tue Nov 17, 2009 8:37 pm

I have my duels set up about as good as you can get for offroad. I still have times it builds up. The trick is to keep the RPM's up in the rough. I would go single but I cant get enough fuel through 1 carb for my taste.

Then again having good suspension will do wonders for duels.

Tue Nov 17, 2009 9:24 pm

fusername wrote: thats the hard part, as it is a single on a type 4. manifold heat is hard to come by.

fuser is right, on a type 4 go with dual carbs..... but on a type 1 you can heat up the intake manifold pretty good where a single can be tuned pretty good.

Tue Nov 17, 2009 10:04 pm

seabeebuggy wrote: I have my duels set up about as good as you can get for offroad. I still have times it builds up. The trick is to keep the RPM's up in the rough. I would go single but I cant get enough fuel through 1 carb for my taste.

Then again having good suspension will do wonders for duels.

x2 as long as your on the throttle dual carbs are great. Its when you need low speed finese in first gear they can be a challenge. I have one dual carb engine for the dunes and a single carb engine for tight trails. These days the way to go would be FI.

Tue Nov 17, 2009 10:38 pm

Perrib is right, for offroad efi is a great way to go.

Tue Nov 17, 2009 10:39 pm

Dual 44s on a 2275.Wouldnt have any less in the dunes.No issues i check sync a couple times a season and and no change.

No flat spots motor pulls nice.Tune them right they will be trouble free.I never had any experience with duals til i got a sand rail in 05 started off with kads and a 1776 then a 1914 with the 44s and now the 2275.There aint much to them.

Wed Nov 18, 2009 9:38 am

baja5 wrote: Perrib is right, for offroad efi is a great way to go.

I keep toying with the idea of using a megasquirt EFI on my 1600, but that would do nothing but keep me off the road longer.

Wed Nov 18, 2009 10:09 am

HamburgerBrad wrote: [quote="baja5
I keep toying with the idea of using a megasquirt EFI on my 1600, but that would do nothing but keep me off the road longer.

And you find fault with that?? :)

Wed Nov 18, 2009 10:54 am

what is the best efi and what's the cost?

Wed Nov 18, 2009 10:59 am

http://www.cbperformance.com/category.asp?categoryid=5

Wed Nov 18, 2009 11:42 am

Thunderbug4U wrote: what is the best efi and what's the cost?

Megasquirt....... The only expense is throttle bodies, once you get past that its all pretty much generic plumbing and electronics..... And ECU is completely programmable from laptop or if you have desk top in garage and long cable....

Dale

Wed Nov 18, 2009 12:00 pm

I run dual 40 idf's on my 1915 and it runs great. Never had an issue with them other than they are very sensitive to altitude change.

Wed Nov 18, 2009 8:58 pm

dual kads on my 1776. i like them

Wed Nov 18, 2009 9:50 pm

HamburgerBrad wrote: baja5 wrote: Perrib is right, for offroad efi is a great way to go.

I keep toying with the idea of using a megasquirt EFI on my 1600, but that would do nothing but keep me off the road longer.

Megasquirt takes some time to set up but check this out. Sounds like a great Idea, especially on a relatively stock motor.

http://www.shoptalkforums.com/viewtopic.php?f=6&t=123149