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Not really. There is the first 6.9 cup which lasted for a year, and was changed to the cup that all 6.9's have after 83. Then the 7.3 came out and it uses a cup with 2cc more volume and that was the cup used, even on the turbo engines.

Sort of. This is a hobby for me.... I'm actually going to work for a diesel company that doesn't support IDI's when I ETS, so it's not like I have much to gain. There isn't a bunch of money to be had because IDI owners are usually cheap. I have to charge at least $3k to build someone a turbo...

Interesting. I find it depressing that the 6.2/6.5 market has such support, but the 6.9/7.3 market doesn't. My best guestimate is that the Powerstroke came out in mid 94 to replace the IDI whereas the 6.5 ran so much longer....I'm guessing that's when its performance base started, to help play...

I wouldn't think that piston would work too well just by looking at it, but I'm not an engineer. Whats the results of this piston in the engine its running in?

You would need to change the piston to match it. Also, you do not get your power from the flame front coming out of the pre-cup and hitting the piston. You get your power from the 'secondary' combustion that takes place in the main combustion chamber.

you can see in this picture exactly how the pre-cups fire, and how wide..... you can also look at the piston to the right, and see how clean and even the burn/combustion is across the piston.

I'm not generalizing "you" as in the "gm IDI guys".... You guys are more innovative than the 6.9/7.3 crowd for the most part by far... which is why I find myself continuing to come over here. Black smoke, and EGT's also are largely, and primarily controlled by your pump calibrations and timing...

I would also like to add, just so there is no confusion. I'm not mad, nor am I trying to be abrasive. I truely enjoy this type of debate. Its strong debates like this, that inspire, and lead to new innovations.

I never thought I was running 180cc. I was told I was running 150cc, and after I dynoed I had doubts... and you're right, I wouldn't entertain the idea of the pre-cups being a limitation. Good thing too, because they weren't. What I don't understand, is how so many people have adopted an...

nothing wrong with this, however the thought of "GM already did it, so it must of helped" is hard for me to jump on board with considering other design flaws. That being said, the people who are interested to know exactly what the cups do..... why are we not doing pre, and post dyno's so you...

I have said many times.... that I believe it is very possible to improve upon the pre-cups, but they are not worth the time and testing involved, for the minimal gains you will see. 100cc is still not very much fuel..... I'm talking about getting into the 180-200cc realm. I'm currently...

I have taken several different configurations, and documented how they perform, and drawn a conclusion. More than anyone else has..... Therefore, my research is more factual, and holds water, better than the speculation of others. I dismiss the discussion because all it is, is bench racing...

you are only going to get so much power from a measly 80cc's of fuel.... no matter how you manipulate the pre-cup, or anything else... it is only going to go so far. It is money, and time much better spent getting more fuel into your engine, than messing with something that already works well...

BINGO!

That's the way I took it...... For the record though, I don't post there anymore because I joined the Band...... otherwise, I enjoyed ruffling their feathers. In the months following mine and Racin's departure though, most of the OB members showed their faces on the other websites we...

As for my turbo, my first turbo I got cheap, I just bought a new charger from a vender on Comp-D and paid $1070 shipped for a custom setup. You can buy a brand new, box stock BW unit for $700. You are right, my first (and current) charger is too small, especially on the turbine side.... I'm...

I searched and Skimmed through, I think I found what I was looking for. Seems like you guys found something that works.... My only other question, is why has nobody put an S300 chassis turbo on. Seems like a no brainer to me?

I see this referred to a lot. I searched but could find no specs on it, and only a few pictures of it...... What chassis is this charger? rotor group, turbine housing a/r and flange?

CTD....

You could at least take a digital caliper and measure lift on the int/exh.....nothing to disassemble for that....