Any recommendations on a old school 13B Bridge Porting job

spanishchick · Postby **spanishchick** » March 2nd, 2011, 9:17 am

I have basically settled on the fact that I will not modify my existing 12A engine internally. When I got the car the previous owner told me he believes that the engine was mildly ported or street ported?? idk?..but anyways took the Dyno and did a baseline run. The little old 12A engine produced a whopping 96whp and 90ft @6500 RPM this with the stock Carb, Fuel pump, Headers and Crappy Exhaust. The power band was linear peak torque was around 4500 RPM. What was most impressive was the performance of the factory Carb and Fuel system...AFR was a steady 12.5-13.0 across the powerband with absolutely no break up or flatspots. I think I will just upgrade the Carb and Intake cause I located a Holley Carb from a 1st gen RX7 and if its good working condition and I can get jets for tuning it I might just opt for replacing the factory Carb with the Holley along with a slightly bigger fuel pump and regulator. I will also try to locate a good TIG welder to flange and custom make a decent 2.5" Mandrel bent exhaust then head back down to the Dyno and try to get to around 120whp. After the dyno run I decided I will keep the 12A engine as a spare and locate a 13B for a performance Bridge Port build with a Weber 48/51 IDA Carb and supporting mods hope to get to around 150-175whp. I would like to stick to the old school N/A route using Carb and Distributor to make HP I am not interested in stepping up to the Turbo engines and EFI tuning cause for me it will take away from the originality of the car. If I wanted to go that route and make big HP I would slap in a 2JZT with Nos and call it a day! After driving around the country over the weekend and making new friends who are all old school Rotor heads and fellow tuners as well I found a 13B engine looking for a new life...so I plan on buying it sometime this week. If you all have any recommendations on a person or shop that can do the Bridge Port build please don't hesitate to say so...

Thanks!

karlos · Postby **karlos** » March 3rd, 2011, 1:43 am

check chowtee in penal debe guy who built peter laquis 20b

gready123456 · Postby **gready123456** » March 4th, 2011, 6:57 pm

^ he is good and so to is Anil. You should keep your 12a u can get around 200hp with a good port job and an 48ida u can also get a msd or mallory ignition capacitive discharge ignition and go direct fire , this will squeeze some hp out of the 12a , u dont have to go over board just get one MSD 6a or something similar (mallory is cheaper but is the same as msd). u would be surprised at what the 12a can do invest in a A/F gauge and EGT it will making tuning easier , good luck with the engine and car man pm me if u want a setup diagram of the ignition setup stated above

spanishchick · Postby **spanishchick** » March 5th, 2011, 11:30 am

gready123456 wrote:^ he is good and so to is Anil. You should keep your 12a u can get around 200hp with a good port job and an 48ida u can also get a msd or mallory ignition capacitive discharge ignition and go direct fire , this will squeeze some hp out of the 12a , u dont have to go over board just get one MSD 6a or something similar (mallory is cheaper but is the same as msd). u would be surprised at what the 12a can do invest in a A/F gauge and EGT it will making tuning easier , good luck with the engine and car man pm me if u want a setup diagram of the ignition setup stated above

Thanks for the advice, but i've already decided on going the 13B route. As far as the 12A goes, I really love the daily driverbility of the car with the stock Carb...even thou the car is over 30yrs old I can pick up the car and go almost anywhere without having to worry about breaking down. The only thing missing is the A/C so that's about the only drawback, but other than that it runs great. Like I said on a previous post I sourced a RacingBeat Holley bolt on Carb kit locally assuming I can still source the jets for tuning. I might just remove the stock Carb and Fuel pump and bolt on the Holley with a slightly bigger PSI pump while still trying to maintain the daily driverbility until I drop in the Bridge 13B with the IDA. I will definately take you up on the Ignition system when the 13B is in...so we will keep in touch.