Big Block Drift Truck - Pic Heavy

[Uncle Gump]

Well if one of your four carbs goes out of sync or craps out... you loose three cylinders.

There are some unknowns too with your plenum... reversion... fuel stand off... etc...

I've had good luck with webers on inline 4 cylinders. One barrel per cylinder... straight flow... lots of parts for tuning including venturis and even blow through parts available.

Whatever you choose... I'm pulling for ya. It's a cool ass project!

 

[bobbywalter]

that stetup is the best looking one in my opnion. the only reason im deciding to go with 4 smaller carburators ( 2 per 3 cylinders) is that if one of the webbers goes out of tune or craps out, 2 cylinders are affected. if that makes sense.

here is example of how i think of it.

3 carbs = 600cfm total
3carbs - 1 carb =400cfm

VS

4 carbs = 600cfm total
4 carbs - 1 carb = 450cfm

and the loss of cfm is distributed between 3 cylinders insted of 2


Here is the design im going with.

View attachment 132669View attachment 132670View attachment 132671View attachment 132672View attachment 132673View attachment 132674

2 1 bbl carbs would probably be too much. but i can see it actually working very well in the stock hp configuration and cam/valve event profile biased to port efi....

the size per cylinder and actual stroke combined with the short runner is not the ideal.

the steady operation throughout the rpm range is hard to do.


so 2 1bbl i would wager with a distribution plate/cone under a bolt on mount would be pushing it....let alone 4 carbs.

its not a radical cam high compression high flow engine. the intake is only good for higher rpm in this configuration. idle to 1600 might be shitty...


might work great....might not.

 

[SenorNoob]

Roughly 50 CI per cylinder. About 100 CI 2 cylinder on Harley engines is common. What do they use for carbs? I get that people work with what they now. And I certainly appreciate a good carb engine, but I'd have used fuel injection IF stock like power and RPM range...

 

[901wd#2]

Two carburetors feeding a Plenum feeding three cylinders, x2? it’s making my eye twitch.

6 div by 2 works better in my dumb head.

 

[bobbywalter]

Roughly 50 CI per cylinder. About 100 CI 2 cylinder on Harley engines is common. What do they use for carbs? I get that people work with what they now. And I certainly appreciate a good carb engine, but I'd have used fuel injection IF stock like power and RPM range...

maybe 3 cv 40s...a dyna 1600 has one carb.

my 650 klx uses the same carb.


this suspect this would offer the best most cost effective range of tunability...hard to say without trying it.

you can get new chinesiums for 80-100 on the jungle site...worth a shot.


i was at summit the other day and looked at some stuff i thought would work on this......

 

[bobbywalter]

they got stuff

 

[Blmpkn]

they got stuffView attachment 132766View attachment 132767View attachment 132768View attachment 132769View attachment 132770

Man.. I'm so jealous of people that are within striking distance of an actual summit store.

I wish they'd build one further up in the northeast.

 

[pjtoledo]

Man.. I'm so jealous of people that are within striking distance of an actual summit store.

I wish they'd build one further up in the northeast.

they have tools too

Chisels - In Stock Filter Options - Vendor In Stock Filter Options - Free Shipping on Orders Over $109 at Summit Racing

Find Chisels In Stock Filter Options, Vendor In Stock Filter Options and get Free Shipping on Orders Over $109 at Summit Racing!

www.summitracing.com

 

[bobbywalter]

it's funny because I buy stuff for rebuilding our oil rigs there because of the tools and parts on hand.

deutche products and tools, cab heaters/coolers. builder relays/systems and power distribution modules... wire....and switches that ohio cat don't even have in stock. just walk in and get it. they have a bad as comms shop with any communication devices you want.

 

[bba952]

started the final assembly.

 

[bba952]

also did some work on the intake. didnt have any argon to weld so i filled in the injector ports with some Harbor Freight aluminum brazing rods. its my first time using them but surprised with the results. its similar to soldering and you have to be careful not to overheat the base aluminum.

 

[bba952]

after days of researching i decided to try 6 cheap Mikuni HSR Carbs for the intake. its not the perfect solution, but they are easy to install, and every time i look at the intake all i see is the perfect opportunity to try a individual carb setup. something similar to this-

 

[Blmpkn]

they have tools too

Chisels - In Stock Filter Options - Vendor In Stock Filter Options - Free Shipping on Orders Over $109 at Summit Racing

Find Chisels In Stock Filter Options, Vendor In Stock Filter Options and get Free Shipping on Orders Over $109 at Summit Racing!

www.summitracing.com

You win for the day lol.

after days of resarching i decided to try 6 cheap Mikuni HSR Carbs for the intake. its not the perfect solution, but they are easy to instill, and everytime i look at the intake all i see is the perfect oprotunity to try a individual carb setup. something similar to this-

View attachment 132869View attachment 132870

Yaaaassssss!

 

[SenorNoob]

Goin with 6 pods too?

 

[bba952]

finally got the comp cam kit in the mail.

also locked out the hei distributor.