Lots of 3.8, Supercharger, and Oddfire Ramblings

Alright, I have some day dreamer ideas.

I am still trying to get my supercharger set-up ready for my oddfire commando. It sure looks like the HEI is gonna be in the way of my blowers drive pulley.

Has anyone run coil pack ignition instead of distributor on an oddfire.
Did any of the RWD BOP's have coil packs. Coil packs run better in the wet stuff with less worry of killing the motor.

Some people say I shouldnt run the MPFI on an oddfire, WHY? I dont see how its a problem, my supercharger intake is MPFI is why I ask. I plan to use Megasquirt.

I have a 3.8 series 1 that I stole the heads off of, Does anyone know if this thing has any interchangibility with RWD, I cant find any good info on these FWD. Are the cranks, rods, pistons, etc the same as RWD. I'm sure I could adapt the block to RWD if I wanted (Its been done before).

I plan to test some of these thoughts this weekend, but dont have enough time or money to test them all. Does anyone know this stuff for sure or maybe just ideas.

 

Also, does anyone have any quick ideas on how I could fix my pulley / HEI problems without going to coil packs.

I could build an offset spacer, possible intercooler, its an eaton M62 supercharger off a 92-95 model buick, with matching intake and heads.

Thanks in advance for any help.

 

Re: Lots of 3.8, Supercahrger, and Oddfire Ramblings

The first thing is the water passages on those heads aren't gonna match up to the oddfire block. They might if its a 231 oddfire block, don't know that for sure but there not gonna match a 225 at all. The 2nd thing is the multiport will need some means of identifying where the crankshaft is during rotation, so you're gonna need a crank sensor. The distributor on the Buick will be a problem, the coil packs won't work on an oddfire without a crank position sensor.
You have alot of problems here due to the fuel injection set up and the heads you have chosen. I don't think you have a grasp of what the oddfire motor is, it does not fire every 120* like a standard even fire motor, it fires 90 150 90 150 90 150. Read this http://home.off-road.com/~merls_garage/oddfire.html and you will understand what they mean by oddfire and see some of your problems with multi port injecting it and running coil packs.

Others can chime in but I don't really consider this a viable power plant right now, sorry to rain on your parade.

 

Understanding the oddfire is not my problem right now, I have a full undestanding of that.

And the water passages are not a problem, already taken care of in that department using some quicksteel epoxy and a little drilling to match the gaskets.

Just curious about distributor drive gears and camshafts with running the coil packs as I might have to cut off a distributor shaft and cap the cover. Sensors should be programmable with the megasquirt options from what I have heard. Any Thoughts?

Thanks for the reply though.

 

Re: Lots of 3.8, Supercahrger, and Oddfire Ramblings

The megasquirt unit uses rpm averaging to over come the oddfire pulse, it does not use the sensors unless there is a crank trigger. The megasquirt is what I'm going to use, a friend of mine has one on a 500" big block chevy pushing 1250 hp. I still think you're getting in to deep on this. Coil packs would still need to be triggered by a computer and a crank sensor, regardless of the megasquirt or not. You might be able to build a a low profile cam trigger that goes where the distributor goes to trigger the coil packs and the injection unit but it will have to be built very accurately, not thrown together.
May I ask why you want the supercharger and multiport for a Commando over a TBI and the stock 225 heads that are modified. That would make plenty of power and would be much simpler and more reliable. My .02¢

 

Just a dream. (Maybe just bored)

Have all the parts, except for coil packs.

"If you can dream it, you can do it"

 

I would really like to keep the oddfire in the commando, either one of my dauntless or 231 OF blocks.

My postal will be getting a Buick V6 also, (fell in love with em), so it might get the 92-95 block with supercahrger and keep it super simple, thats why I wondered about interchangibility of RWD components like pistons, etc.

Still want to put a blower on an oddfire though. Have seen the old 6-71 on weiand intakes, put want to come up with an easier (Cheaper) way of adding low end boost.

Would hate to have to scrap the idea and go with a turbo. Just wouldnt be as much of a challenge.

Please add any opinions, good or bad on my part. Thanks

 

Yea but some dreams are closer to reality than others.
Just because you have the parts don't mean its gonna go together and run.

 

Try looking for a used paxton unit or possibly a B&M blower. The paxton would be the easiest to do of all of them. The clearance issues would be virtually nill, you would have to mount your alternator on the drivers side or mount it like you would with the ac compressor stacked on top but its very doable. Distributor would no longer be a problem.

 

Re: Lots of 3.8, Supercahrger, and Oddfire Ramblings

I dont guess Ive seen the turbo Fhead on this site.

I know a guy around home with one in a 2a. Pretty sweet and farmboy fabbed. I dont think it cost him a thing.

 

More than one of my projects started out like that. May not have turned out like I first invisioned but I always learned something useful for the next time. Go for it just take pics. We like pics.

 

There is no way that I know of to run coilpacks on an oddfire due to the EF module underneath it --invent a module and then maybe. you need to also retard timing under boost. MSD 6BTM will solve this (I have an extra one of these). A Cam sensor from an 86-87 Turbo 3.8 looks like a tiny distributor and will prolly clear. There is a guy on ebaY that sells em so you can see what theose look like. It is only a cam position reference to the ECM so you have to figure out how to fire the coils.

Biggest problem I see is that you need dished pistons --forged if you want it to last. Std pistons is too high compression --*Ping BANG* put a fork in it. (I have a spare set of 231 dished cast pistons available too)

I can't see how its going to work but I like the way you think though

 

If you need any info on that motor head over to www.clubgp.com and ask your questions. That place is a wealth of knowledge on those motors..

 

There might be some info on this site:

http://www.gnttype.org/forums/

CHEERS

 

Find A Vintage Mini Blower, Modify An Old Offenhauser Intake And Use A Dual Setup Running Vintage Or Factory Carbs, Or A 4 Bbl. Stay Away From Computers. Computers Are The Devil.