wozzoom

Has anyone out there ever built a Non-Turbo 20B?

I know the topic has been discussed in the past and for the most part dismissed as being a waste of money, but I'm willing to give it a shot. Why? Because I’m sick of not having any torque down low.

My current plan is to take a stock 20B and replace the internals with S5 NA rotors. I will not port the engine in order to keep the intake velocities high. The engine will be going into an 86 NA, so the driveline will be upgraded to a Turbo II transmission, flywheel, and rear. For engine management I'm considering the Microtech LTX12. The exhaust will be mated to a custom header, silencer, and cat back

The GOAL of the project is to have a 220-230 RWHP daily driver without all of the heat/complexity of adding a turbo/innercooler.

SO AM I CRAZY? What am I missing in the equation? Is my RWHP goal unreasonable or conservative?

I appreciate any constructive criticism you may have!

banzaitoyota

Sounds good. Will it work? I don't know. If you can afford it do it

lleone

Why not a light pressure helical-styled supercharger with no intercooler?

Jeff20B

iTrader: (13)

You'll need to port the exhaust. Depending on your intake manifold, you'll need to port the primaries too. Otherwise, it'll be a waste of money. The secondaries are tall enough for what you're looking for.

wozzoom

I haven't ruled out all porting, but I'm trying to retain as much low end power as possible.

As for the intake, I'm planning on using the stock 3-rotor intake. Fabrication of a custom intake may happen after the inital build and install.

Thanks for the tip!

wozzoom

Interesting possibilities with a supercharger, but outside the design parameters of my project.

Think *Simple*.

If I was going forced induction, I would just stick with the turbo since all the fabrication has been done before.

j9fd3s

iTrader: (3)

i would put the turbo sleeves in it at the least and consider using renisis rotors cause they are cheaper, but other than that it sounds good

mike

wozzoom

Renesis rotors might come into the equation based on availability and budget. Am I correct in assuming that I can use any 3 matched rotors and NOT have to worry about a proper counterweight? Do 20B's even have a counterweight???

What do you mean by "Turbo Sleeves"? Are you refering to the exhuast port sleeves?

j9fd3s

iTrader: (3)

yes the exhaust port sleeves.

dammint you're right, with the 20b couterwieghts you need 9lbs rotors, so 89-02 rotors are the only ones you can use without rebalancing

mike

wozzoom

Can anyone verrify the weight and compression of the stock 20B rotors?

I'm assuming that they are 9.54 lbs and 9.1 compression ratio? I haven't actually been able to find this info for 20B engines.

Jeff20B

iTrader: (13)

I think they're 9.0. The weight is probably 9.5 LBS like you said.

j9fd3s

iTrader: (3)

same part # as the 89-91 t2 rotors

mike

RETed

I might have on in the works, but we're not going to be messing with the rotors for a while...


-Ted

wozzoom

Ted,

Care to elaborate? Or is this a top secret kind of project?

The thought has crossed my mind to NOT rebuild the 20B right away. Just run it NA with the 9.1 compression rotors. This way if I decide that I'm not happy with the HP, I could always remove the header and replace the turbo/IC.

peejay

Aircraft guys build N/A 20B's all the time. I believe there are a few peripheral port 20B's attached to propellers as well...

RETed

Well, the deal wasn't sealed until a few adys ago.&nbsp The engine is going into a Zenki FC3S.&nbsp The owner is going to stay with NA cause he can't afford to break parts.&nbsp The car *IS* going to run a full Turbo II drivetrain, although it was originally an NA model.

We're trying to keep this project cheap and reliable at this point.&nbp Right now, a Haltech E6K is going to fire everything.&nbsp The coils are going to be a trio of leading FC coils running "simul-spark" firing of both leading and trailing for each rotor.&nbsp The car is going to be built as a street car with occasion track use for drifting events.

We're going to keep the stock intake manifold for now, although there are plans in the works for a custom "sheetmetal" (read:&nbsp lighter and more compact) intake manifold.&nbsp Look for dyno numbers off this thing by the end of the year...


-Ted

wozzoom

Sounds like the owner and I have a lot in common with our goals. The project sounds awesome and I look forward to hearing about your progress. IE: If you have any helpfull hints, I'm all ears!

Jeff

vosko

iTrader: (4)

how much torque will a N/A 20B have ?

more than 250 at the wheels ?

sandor's T2 made 260rwhp and 280 tq with a reman and stock turbo.... 20B seems like MUCHO OVERKILL!

j9fd3s

iTrader: (3)

yes, thats a good thing

mike

$150FC

Overkill?

I think you're on the wrong forum, boss

RETed

We like to be...different.


-Ted

vosko

iTrader: (4)

come on i have to hate since i don't have a 20B. i was pretty damn close to getting one for my T2 but i sold the car and my TEC III 6/12 unit....

i know about overkill........ driving a 10 second power FD on the street is overkill lol

you know i did get a white 90 T2 i could make it a 20B

j9fd3s

iTrader: (3)

its eligable

vosko

iTrader: (4)

if that happens i am paying for a plane ticket for you to wire up the E11

wozzoom

So who's going to come any wire up my 20B when its installed?