Anyone with any experience? I saw 34mm universal sidedraft carbs as low as $22 each and I can't help but wonder how 8 of them would work on a 4.8L v8 or a single one on a Predator engine go kart. Searching pwk carb seems to get you a bunch of options.
I put one on my tiller. Works great.
Put one on my '52 Matchless 500 and it was a huge improvement over the Amal that was on it.
That being said, the Amal was more like a pipe with a hole in the side than an actual carburetor.
I use these cheap carbs on my go karts. I’m about to buy one for my DR125.
I like to see the linkage for 8 of these including the 8 individual chokes but why not?
I used a 19mm one on a 5hp Briggs for my drift trike. Worked great for $14.95
oldopelguy said:Anyone with any experience? I saw 34mm universal sidedraft carbs as low as $22 each and I can't help but wonder how 8 of them would work on a 4.8L v8 or a single one on a Predator engine go kart. Searching pwk carb seems to get you a bunch of options.
On a 4.8 they would be waaaaay too small. (Would you put two 34 DCOEs, if they existed, on a 2.4l four?) I'd want something 45mm at the VERY least, and preferably 48-51.
Knurled. said:oldopelguy said:Anyone with any experience? I saw 34mm universal sidedraft carbs as low as $22 each and I can't help but wonder how 8 of them would work on a 4.8L v8 or a single one on a Predator engine go kart. Searching pwk carb seems to get you a bunch of options.
On a 4.8 they would be waaaaay too small. (Would you put two 34 DCOEs, if they existed, on a 2.4l four?) I'd want something 45mm at the VERY least, and preferably 48-51.
According to my Weber charts, for a 600cc cylinder you should be looking for around a 41mm throat for peak power at 6000rpm, or around 34mm for peak at 5000rpm.
In reply to 02Pilot :
I'll check some cathedral ports for dimensions when I get to work, but I have a feeling they will be much larger than a 34mm circle's area.
34mm hole has 1.4 square inches of area. A 1.89" intake valve has that much curtain area at only .200" lift. At any lift over that, the carb will be a restriction (even before figuring the venturi into it), and the thing with IR intakes is that the carburetor must be able to flow the full instantaneous flow demands of the port, since there is no plenum to average everything out.
Why stop at 8? With a log manifold you can use as many as you want.
I
In reply to A 401 CJ :
It's better than bad.
It's good.
This idea really excites me. But I also think you can buy motorcycle carbs on ebay by the 3s and 4s (with correct linkages and ancillaries like TPS and vacuum ports) for like $100 for the set - so not much more expensive, right?
Back when I owned a ford 302, I really wanted to take a cobra lower intake manifold (or the truck one) since it has 8 circles in a line, and basically use simple elbows to build an upper intake to connect two sets of 4 motorcycle carbs.
Never did it, but maybe I will in the future if another v8 falls in my lap.
In reply to Robbie :
Ive thought that same thought about the 3400 v6.....
Knurled. said:oldopelguy said:Anyone with any experience? I saw 34mm universal sidedraft carbs as low as $22 each and I can't help but wonder how 8 of them would work on a 4.8L v8 or a single one on a Predator engine go kart. Searching pwk carb seems to get you a bunch of options.
On a 4.8 they would be waaaaay too small. (Would you put two 34 DCOEs, if they existed, on a 2.4l four?) I'd want something 45mm at the VERY least, and preferably 48-51.
What about doubling it. He could have 16 of those small carbs on his V8 ...
This thread is very interesting, i have a 15hp evinrude outboard with a trashed carb ( spend a few days under salt water)
Now I need to go read up on sizing carbs for 2 strokes.
Also I wonder if regular replacement bets from a kehin or mikuni would fit.
oldopelguy said:Anyone with any experience? I saw 34mm universal sidedraft carbs as low as $22 each and I can't help but wonder how 8 of them would work on a 4.8L v8 or a single one on a Predator engine go kart. Searching pwk carb seems to get you a bunch of options.
It's not related to these carbs specifically, but there was a discussion that delved into this general idea last year: https://grassrootsmotorsports.com/forum/grm/guess-the-horsepower-this-454-made/128139/page1/
As in that scenario, while they would certainly be too small to use on a per individual port basis for a 4.8L V8 to make any real power, they could work in multiples when mounted to some type of shared plenum.
Much like the biggest venturi you can get on a DCOE 45 is but 40mm, I'm guessing that 34mm is not the venturi diameter on these. What the actual venturi size is would be pretty useful information when scaling up.
Edit: Come to think of it, if the venturi is around 30mm, the two per individual cylinder idea would have roughly equivalent area to a single 42mm venturi, and might just be getting into the right ballpark.
In reply to Driven5 :
Thanks for the link. I'd forgotten all about that thread. Showed it to some of the new guys here and we all had a laugh!
Doesn't using lots of carbs feeding a shared plenum sorta ruin the reason of individual throttle bodies?
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