I really want to bridgeport my 12A. I really want a supercharger. I don't want this to turn into a post about turbocharger vs. supercharger. I just want to know if this setup will run well. Most guys that go with forced induction go with street porting. Is this the better way to go?

 

The goal with any kind of porting is to alow more air and fuel into the engine as well as to change the timing at which the engine accomplish this (much like a mod. cam in boinger engine) Larger intake ports are important if you want max. performance out of your NA Rotary. Bridge-porting is the ultimate in porting techniques. It allows max breathing capability without losing ALL drivability. Turbocharging is a completely different matter, no longer are HUGE intake ports needed, as air is no longer "drawn in" it is Compressed! because of this, there is no need to port the engine, although there are benifits that can be gain from a running a small Street-port. If you are running a carb still, the primaries can be jetted for "around town driving" and the Secondaries can be jetted to enrichen the mixture under boost. A nifty trick is to reverse the spring in the secodary diaphram and rework the linkage so the saecondaries open only under boost. Talk about a kick in the pants when the boost kicks in! Best of all, if you can control yourself, MPG wont suffer dramatically...yeah right!!!! Isnt turbo-charging grand!

 

Sorry, I forgot to mention, the same goes with Supercharging as well.

 

I don't know **** about it, but it seems to me that the high powerband of the bridgeport will either compliment the supercharger's low end, or cause the supercharger to spin to burn itself out at the rev's you need to take advantage of the bp. I think you'd have to carefully design the supercharger system to compliment the bp well. That's just my theoretical 2 cents.

 

That is sort of what i was thinking. Bridgeports dont have much low end torque. Superchargers give lots of low end torque. I'm not planning on running a lot of boost anyway. Maybe 6-8 psi.

 

The reason boosting a bridgeport with a supercharger oposed to turbo is because of the overlap. The supercharger will be giving boost at low rpm and a greater amount of the intake charge will be lost in the exhuast. But turboing a bridgeport won't do this much since boost will be delayed and won't force out some intake charge at lower rpm. Yeah, thats why supercharged rotaries should be streetported only to mild or extendport ok. A extend port won't force the intake charge out the exhuast really.

 

nO one seems to post horse power numbers with thier new mods or with thier answers to questions. Why not? I don't know about others, but i like to know the hp to get an idea of what its got. Im trying to find the most hp out of my 12 a i can get. If i cant get enough ill have to go 13b.

 

ive got a holley with vac secs and cant find a "how to" that shows how to convert to mech secs for runnin blow through turbo, any suggestions? you just seem like you know your carbs better than me

 

I would think that a bp would be better w/SC then a turbo. Who cares if you blow a little intake charge out the exhaust, thats the idea of scavenging (obviously not good on the mpg's, but if your going to bridge or SC, you probably could care less). Sure you may have a harder time making much boost low rpms, but it would still be a vast improvment of low-end torque due to the forced scavenging.

As far as the compressed air not caring about port size.... that is a myth, the same gains will be seen on porting whether force fed or NA. Though on a turbo set-up you're gains (especially low end) could be less due to the overlap (it comes down to sizing the turbine), a SC on the otherhand would like the porting just like a NA. The reason why most don't do it is because similar gains can be had by turning up the boost, while retaining a greater level of streetablity.

I'm not sure but reliablity could suffer a bit more on a bp and forced induction, due to the rapid intake temp changes effect on the bridge - it might be more prone to cracking.

 

Why do people care about HP in the first place? Since it's TORQUE that really means anything...

 

I really hope you were only kidding.

 

Is anybody on here even running a blower right now? And I'm not talking about vehicles "under construction", I mean, it's on the street, driving, right now.

Dan