Turning a 7.3 idi 6.9

[rustygold]

I like my 7.3 but I just wondering 7.3 has a high cavity issue. And the 6.9 don't but it has weak head bolts and rocks. OK so I guess my question is has any one try to sleeve a block to stop cavities by Turing it into a 6.9 or got hard sleeves for a 7.3.

I'm just tossing the idea around because I know in my 60 series detroit I can pull the sleeves if bad. I do understand that 7.3 you can't pull the sleeves but maybe you can stick some in there.

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[franklin2]

I think you are worrying about something that is never going to happen. Sure it happens, but is pretty rare. I have only seen it posted a couple of times on this board.

 

[Hydro-idi]

If your concerned with cavitation on a 7.3 idi, build a 6.9 with ARP studs and updated rockers and save yourself 5k with your idea.
What your trying to do is not cost effective nor has anyone done that as far as I know.

 

[rustygold]

I don't think I am worried but could be just don't know it.

Now I do like make engine better longer lasting ect. Like I have also thought about gapless rings in a idi or any diesel could be better.

Some of my ideas if I had a machine shop and didn't have to worry about money I would try anything that sounded like it could work.

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[no mufflers]

I saw a post on an IDI Facebook page about someone making the ring gap smaller. any major benefit to that?

 

[rustygold]

Well in theory having gapless rings give you 3 to 5% more power over all in gas burners.

Like if you had a 9 to 1 it would feel closer to 9.5 to 1 so it feel like it has more pep. But yet again that's gas burners.

Gapless rings have two ring on the first landing so it's a total seal or 75% more seal.

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[FarmerFrank]

Too tight of a ring gap will pop the tops off Pistons. Ask me how I found that out.

I file them bigger now. I'd rather lose 1 or 2 horse power or use a little oil over building an engine twice.


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[rustygold]

Well its the same tightness as a regular just two of them. I understand you never take an oversized ring and file them down to fit.

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[Macrobb]

Don't worry about the 7.3 cavitating; pretty sure that if it hasn't happened by now(usually 100-180K seems to be typical), it's not likely to.
I'm thinking it wasn't just cavitating, but that combined with casting flaws making some blocks more prone than others.

If it *does* cavitate, a good machine shop can bore and sleeve just the one cylinder that's leaking(and should be able to check the others for imminent failure).

6.9 would be a really interesting platform with some bigger bolts to take care of the head gasket problem. I'm still looking at someday building a tool for drilling up a 6.9 block to take 9/16 grade 10 socket head cap screws. They should be far stronger than 1/2" ARP studs, at a fraction of the cost.
The problem is that re-drilling and tapping the block is a pain, and requires special tools to do. To my knowledge, nobody has successfully done it, though one guy got close.

 

[rustygold]

Well when that cast it they don't leave much room for bigger bolts but the only way that it could ever be done is a block cnc machine.

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[IDIoit]

have you priced getting a sleeve done?
the last time I checked it was something like 100 bucks a hole plus sleeve.
that was just to install sleeves.
then you gotta bore & hone it.
gets real expensive, and not worth it
unless you have a real sought after engine.

 

[rustygold]

Yeah can get expensive and it would make since if it's was matching number truck or an engine that was around a short time.

They can make a racing sleeves for a 7.3 and that was crazy expensive. They do make an sleeve with oring cut into it.

I'm not going to do sleeves unless it's only two maybe 3 holes are bad.

Also got a hole of a head manufacturer they said it could take 2 years to design, make, and test a 7.3idi useing direct injection. They didn't tell me a price probably more than I can afford.

I do love my idi can't say anything bad about it just that power output are low.

I think it would be cool to make a 7.3idi into a direct injected better intake, lower compression, with higher boost.


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[IDIoit]

most likely will be cheaper to mechanically inject a powerstroke

 

[hesutton]

It's been done a couple of times. Last to do it was Eric Sutton. Not been on here for a couple of years. He sleeved his 7.3 to a 6.9, studs, hypermax c-rings. Very interesting build. Not sure what happened to him or his rig.

Will look for the old post.....

Heath

 

[rustygold]

Yeah that's probably true I think it's 11k for the kit but why stop there could go comon rail on the powerstroke there is a guy that has already done it useing the idm from the 7.3

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