BIG POWER With BLOW THROUGH CARB ?? ((CRISPEED)) ??
 

I'm wanting my new combo to consist of a Blow Through Carb, 13B REW, Large Frame Turbo and Straight Alcohol.

Are there many rotary guys making big power with Blow Through Setups? I know that the mustang guys are making 1000 + whp so they must be doing something right.

why not use the Mustang engine, and be done with it, 1000-1400hp turboed is right around the corner.

Because I'm sticking with a rotary.

i've done alot of blow-thru setups. i prefer holleys all the way! what carb you wanting to go with?

it's pretty easy to make big power with a carb, you just gotta understand the one you have :)

Paxton Holley Blow-Thru Setup
 

If your really interested I have a system I built a couple of years ago everything is brand new. The carb is a Holley 650 Double Pumper with a base adapter that goes to a 850 Double Pumper 1:1 base plate. The system is all setup to run alcohol with a fuel enrichment circuit built into the body. Not sure how the Mustang guys are doing it, but personally I would start with gas it is less of a headache.

The system I built is something I wanted to market a couple of years ago, but the guy that was supplying me with the Weber Power Plates was just too flakey, and I could not get him to commit to supplying me with a large volume of parts. The system does not have a bonnet it is a complete box with linkage and fuel inlets plumbed with AN fittings. Paxton makes the best Holley Blow-Thru box on the market and it looks really clean. The box I have is all polished and the system is complete ready to bolt-on.

Don't mean to step on Crispeeds toes? Looks like thread may have been intended for him.

I'll post some pictures up tonight so you can get some ideas of what I described above.

Good Luck.
Albert

On carbs? You're just not seeing the pile of engines they usualy go through in getting to that point.

A properly tuned carb has the potential to allways make more power then FI. Due to the pressure drop accros the chokes when the fuel atomizes it drops temprature. Hense blowthrough guys being able to run 10-12 psi nonintercooled safely. I think Robert did his origional 680rwhp on his 12a blowing through a weber.

I don’t know... You want be getting pressure drop across the chocks when the plenum is under boost. I doubt that carbs have as much potential as efi. I think that some tuners have persisted with them in the early days because of resistance to change to the whole computer injection scene.

I'm looking forward to seeing this pictures. Thanks, bro.

I'm glad to see that you are keeping your car and sticking to a rotary engine.

Zach

My car sold like two months ago, I got a different car but sticking with the rotary :buttslay:

Hey Eric....congrats on the new car! Can't wait to see it finished and running down the track. I don't know if you know of these places but i'll post the links anyway just in case. They might be able to give you a hand figuring things out.

http://www.superiorairflow.com/

http://www.eastcoastparts.com/

I know i got the 2nd one from Chris (crispeed)

It's not the pressure drop that causes the change in temprature. It's the pressure drop that causes the fuel to turn from a liquid into a gas. The atomization of the fuel is what causes the drop intemps. On a FI car the fuel doesn't have that change it's just spraied into the air stream. There is a drop in temp with FI, but not as large as with a carb. When I drive my car anywhere with ambiant temps below 50*F my manifold Ices over. you can't argue with physics my friend...

but a fuel injected car will have better fuel atomization. That was the whole point of the development of mechanical injection that lead to electronic fuel injection.

this will be an interesting setup to be sure. Why not just use efi? All the 7 second rotary guys out there took thier carbs off a long time ago in favor of efi. Why take a step in the wrong direction?

Actually Hyper4 is correct. A proper carb will always atomize fuel better than FI, at least at WOT. EFI has taken over because you can give a much more accurate tune on the rest of the curve and because it is very consistent. You don't get floats collapsing or starvation when make a left turn.. The only real place where carbs make sense in a race is at WOT, and the number I recall seeing was only by 2% or something. Not worth it to me.

On a N/A car, FI has the bonus of not needing the system to be under as much vacuum to draw fuel. No chokes = less overall restriction.

then way do top fuel cars use fuel injection?

I think its because of the large amount of fuel they require. Plus the forced induction occures after the fuel is fed on a top fuel car.

I'm trying it out because I already have alot of the parts to go blow-through. I also have someone that's tuned/built alot of high HP blow-through setups.

I'm willing to bet there are alot more carburated blow-through rotary guys than you guys know about.

This is why I put Crispeeds name in the title, I was hoping to get some information from people that have been around the rotary drag racing scene.

I'm not in a big hurry, I'm currectly setting up the 4 link / minitub right now. Setting up the motor combo will be the last thing I do.

makes sense and really it's all about what you want. I'm always talking to the puerto rican guys in florida at wold wide racing as well as kilo racing and they all swear by ems. Most have microtech however some are starting to use sakura since it's made in pr. The only other rotary guy in my town has a carb and they all tell him that he needs to get away from that thing. Not saying there isn't any power to be had with carb/blow through type setups but it's just that it's antiquated technology. These guys are also pushing the envelope as far as 1/4 times are conserned so they need the newest technology out there. you probably aren't shooting for 7.4xx et's so a blowthrough type setup would be fine especially if you have the tuner that can do that! Good luck with your setup, I would like to see it when your done as I've never seen something like that before.

Darn! gotta put this in (direct chamber injection ??) the Ricans stopped using carbs long ago. Gonzales out of Ocala Fl. ask him about fuel systems?

No we all didn't...

Maybe I’m stubborn but I just don’t see how that’s possible with the atomization theory.
I know that because of injectors high atomization properties, fuel can be added directly into the chamber (direct port injection). chocks or carbs still require long runners to maximise atomisation.

I agree with what you said about the N/A application, I remember reading an article a few years ago by RX Engineering in Australia. They claimed its possible to achieve much higher hp now, well over 300 on 13b application with injection since the restrictive chocks can be removed and replaced with much larger higher flowing throttle bodies and runners that allow the 13b to produce power and breath at much higher rpm levels than was possible before with carbs.

Um runners don't help with atomization. Fuel is atomized in the carb then flows down the runners. Runner legnth and size effect air velocity not atomization. Carbs do not need long runners to better atomize. You've got your info wrong. the longer the runner the worse the atomization of the fuel. That's why they're left rough to keep the fuel from puddleing in the runner.

Post Script:
Shut up we're stealing this thread. LOL!

Which fuel pump were you using? Also, which regulator were you using? What booster are you using, what style? Dogleg, straight or annular? What needle and seats are you running ?


This is directed to everyone who have tried it.........