[gtobird]

Folks,

Let me first start out with PLEASE DON'T SHOOT ME FOR MY IGNORANCE AND WILLINGNESS TO SUGGEST SOMETHING VULGAR TO PURISTS OF THE PONTIAC FAITH. My problem is that my heart drifted with the purchase of my 02 TA when I bought it off the show room floor. I still have two 100% Pontiac 1968 engines in my fold. Okay, now that I have that out of the way, I keep wondering why a Multi-Port fuel injection system couldn't be modified for use on a true Pontiac engine. Had GM kept on building true Pontiac engines, without question Pontiac engines would have ended up with fuel injection as the norm.

When I look at an LS1 engine, the main differences between it and an old school Pontiac engine are:

1.) Firing Order
2.) MAF and Injectors mated to intake vs carburetor and matching intake
3.) ECM Control on the LS1 for injectors, and distributorless ignition
4.) High Pressure electric fuel system vs low pressure mechanical
5.) Use of reluctor for ECM on the LS1
6.) Different stroke / bore sizes
7.) Other things I am missing (Besides the fact that the LS1 is aluminum)?

So, let me address these one at a time in wanting to morph an LS1 fuel injection system onto a Pontiac engine. I'm assuming I can use stock LS1 components such as, sensors, ECM, injectors, fuel rails, MAF and modified reluctor with custom fabricated intake.

1.) I believe the firing order difference to be no big deal. You could re-route the ECM wiring to coils and injectors so it tricks the ECM into believing the firing order is that of an LS1. In other words, the Pontiac firing order of 18436572 looks like an LS1 18726543 firing order by routing the coil and fuel injection wires as follows:

#7 LS1 wire now goes to #4 Pontiac
#2 LS1 wire now goes to #3 Pontiac
#4 LS1 wire now goes to #7 Pontiac
#3 LS1 wire now toes to #2 Pontiac

The other cylinders have the same place in the firing order already

2.) MAF and injectors would simply be LS1 parts used on a Pontiac engine. There were different size injectors used over the years. I'm guessing you would have to find a Pontiac cam (or custom grind one) that would match the profile of an LS1 cam for a given set of LS1 heads that come close to the heads being used on a Pontiac engine.

3.) Since the conversion would be done with an LS1 type ecm, the distributor would no longer be used, but a dummy distributor bottom half would still need to be used in order to drive the oil pump. Again, I don't see this as a big deal.

4.) Yes, a high pressure fuel system would need to be used, but there are all sorts of aftermarket fuel pumps available, both in tank and out of tank. It's the same issue LS1 swappers deal with all them when dropping one into a vintage vehicle

5.) I would have to believe retrofitting a reluctor and sensor on a pontiac engine is doable. I haven't looked at how it would be done, but it seems like it's either a matter of boring a hole in the back of the engine block for the sensor or creating the same type of mount on the trans case / bellhousing. I'm thinking possibly also could be done with a custom inspection plate for the sensor.

6.) I'm not at all clear on how different bore / stroke combinations would be dealt with, but since there are so many different LS engine combinations and hot rodders that are building different combinations, I have to believe there are tuners out there that could accomodate a cutom build with a tune to the ECM

7.) Okay, so what else am I missing? Yes, the intake would have to be a complete custom and an oxygen sensor would have to be added to the exhaust. I'm thinking the most difficult part in all of this is the intake, but hey, there are plenty of 3D printers and skilled metal fabricators out there.

So, besides the fact that this would be bastardizing a Pontiac engine, is this a totally ridiculous idea, or could it be made to work and provide the reliability of other modern engines? I already know that this concept will be pummeled by Pontiac purists and those that only want carburetion. As for the cost vs benefit case? It could be totally ridiculous, then again?????????

Forgive me, for I know not what I am a suggesting..........