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Tips for 1k HP v6

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Old 11-07-2017, 05:33 PM   #1
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Tips for 1k HP v6

As the title says, I'm looking for tips on building something approaching 1k hp out of a molested LX9 motor (GM 3500 v6). This is something I wanted to do for some time and I finally have the means to do it. I've played around with a few 3-500 hp motors (v6 & v8) in the past, but I've never attempted something like this. Mostly looking for tips on how to keep this thing from scattering all over the track.

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I was playing around with different piston/rod combos on summit and I found an out of the box combo that works with just having rod bushings made. These pistons with these rods look like the right combo. C/R comes in at about 9:1, bearing size/bore is spot on AND this combo would be good for ~1500 hp for about $1.1k, assuming the block could be made to live. The only thing I'm slightly iffy about is the rod side clearance since they're a bit narrower, but other than that this looks like an excellent combo. ARP studs, mls gaskets, twin t35's will do the huffing and the heads already flow ~220 cfm. The cam I had ground is 230/235 .54/.55 on a 114 lsa. 1 piece billet main girdle will be made. Other tips/ tricks to make this live?
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Old 11-07-2017, 05:45 PM   #2
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Re: Tips for 1k HP v6

Those rods are for a Buick v6 and the pistons are for a ford v8.

is your C/R mathmataticly calculated with those Pistons, heads, and a set of gaskets?
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Old 11-08-2017, 06:20 PM   #3
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Re: Tips for 1k HP v6

Yes they are, hence having bushings made. I worked it out in engine analyzer pro.
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Old 11-09-2017, 12:50 PM   #4
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Re: Tips for 1k HP v6

1000 hp maybe on the eagle rods. Idk about 1500. I seen some break at that level in v8's and thats less hp per rod than a v6

In all honesty i would think custom pistons are in order. Most shelf pistons arent rated to handle that cyl pressure
You will atleast want tool steel wrist pins
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Old 11-09-2017, 01:42 PM   #5
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Re: Tips for 1k HP v6

Think Eagle would bluff on GN rods? IDK, there's a lot of GN's out there running right at the edge. 9310 pins are an option, but custom pistons wouldn't be a problem.

I was also wondering, the mains are cross bolted to the aluminum pan, but they're not truly structural in the way the LS motors are (cross bolted to the block itself). Is this going to be enough with a 1 piece girdle?

Last edited by bl85c; 11-09-2017 at 01:46 PM.
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Old 11-09-2017, 03:23 PM   #6
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Re: Tips for 1k HP v6

Alot of ratings are hit or miss. So many factors such as rpm, type of power adder, piston weight, fuel, tune, etc. all will influence a power rating in a part

You are in uncharted territory here lol idk anyone building stuff like this
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Old 11-09-2017, 03:51 PM   #7
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Re: Tips for 1k HP v6

Yeah, I guess I should hit up some GN boards haha.
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Old 11-13-2017, 10:38 AM   #8
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Re: Tips for 1k HP v6

Individual billet caps vs a 1 piece girdle. Thoughts?
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Old 11-13-2017, 08:38 PM   #9
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Re: Tips for 1k HP v6

Edit- nm.

Last edited by bl85c; 11-15-2017 at 07:28 PM.
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Old 11-14-2017, 06:05 PM   #10
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Re: Tips for 1k HP v6

Few of my thoughts for what limited utility they are:
-Fill the block before machining with a short fill.
-If the holes in the deck are round, consider deck plugs. They make em for SBC and adding some strength would probably be a good thing
-What crank options do you have? That could go either way
-At 1K you're talking 167hp a hole. At 1500 you're talking 250/hole. Expect a lot of stuff to start becoming wear parts at that point
-You're obviously going to be heavily octane bound. Race gas or Ethanol only for this setup
-Make as much HP N/A as you can. To hit those numbers this probably goes without saying.
-Do you know how thick the deck surfaces are? This could be something you'll struggle with long term
-What power train are you hooking this into? I think that's something you'll need to account fo as well. You're talking a 4L80E, T400 or a Glide at that point depending on what you're looking to do.
-If you're not worried about streetability you may be able to get away with a single. I'd actually think compounding in your case, just because I think you'll hit 30 PSI and pretty easily need more too.
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Old 11-15-2017, 07:28 PM   #11
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Re: Tips for 1k HP v6

Good suggestions, thanks. The factory crank is a forged piece with 2.25" rod journals so it should be pretty stout, but even at that I'm not 100% confident in it. Ethanol only, I'll measure the deck this weekend. Planning on a 4l80E & a Ford 9" rear. I already have it set up with twins so compound wouldn't be hard. Turbo selection help?
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Old 11-16-2017, 06:45 AM   #12
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Re: Tips for 1k HP v6

1000-1500hp on a 660 engine? Wow thst would be a statement in time there. And to be honest I think you would have no issue getting 600-700hp safely but more then thst would be wild and I would be concerned about rod deflection, the crank, and the strength of that block.

realize if you set the drivetrain and suspention up correctly and being a v6 itll be light, mine in its hayday was 2920lbs 3100 race weight. If you managed even 900hp you are talking 8-9 second passes all day long. That would be amazing.

1000hp will be tough without massive amounts of efficient boost with the heads, granted they do flow well but they will never be over 260cfm intake 180ish exhaust. E85, 110 or alky would be the manatory as you'll have to run a ton of boost because no matter what you do the resistance will be there at that level. We are talking 30psi or greater, 2 s362-366 62-66mm borg warners twin turbos in your case. A transbrake will help if you ever intend to race it and want a respectable 60 foot.

I'm following this though. The 3900s are amazing engines. Good luck to ya.

Last edited by fasteddi; 11-16-2017 at 06:51 AM.
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Old 11-16-2017, 08:08 PM   #13
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Re: Tips for 1k HP v6

Shooting for 1000, we'll see if that's even possible... I'll be pretty sore if I can't get at least 800 out of it.
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Old Yesterday, 09:35 AM   #14
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Re: Tips for 1k HP v6

The head deck looks to be about 8-10mm.

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Old Yesterday, 01:33 PM   #15
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Re: Tips for 1k HP v6

Quote:
Originally Posted by bl85c
Shooting for 1000, we'll see if that's even possible... I'll be pretty sore if I can't get at least 800 out of it.
Not too sure about the strength of the LX9, but in terms of air flow and fuel you should reach your goal no problem. Most Grand National guys, when using the stock block and not a Stage 1 or Stage 2, will normally have the block filled, or at least partially filled. Along with a girdle of course. Those guys have a different approach though, as there is a method to their madness. Even GM grounded the stock GN cam with a 108/109 LSA for a reason. Not going to get into why because that argument has been made countless times on the Buick boards explaining the benefit as to why. But anyway, if it were me, I would consider partially filling the block, bumping the compression up, running E85, and getting another cam. You seem to have a firm grounding in the other areas...

- Rob
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Old Yesterday, 01:49 PM   #16
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Re: Tips for 1k HP v6

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Originally Posted by Street Lethal View Post
Not too sure about the strength of the LX9, but in terms of air flow and fuel you should reach your goal no problem. Most Grand National guys, when using the stock block and not a Stage 1 or Stage 2, will normally have the block filled, or at least partially filled. Along with a girdle of course. Those guys have a different approach though, as there is a method to their madness. Even GM grounded the stock GN cam with a 108/109 LSA for a reason. Not going to get into why because that argument has been made countless times on the Buick boards explaining the benefit as to why. But anyway, if it were me, I would consider partially filling the block, bumping the compression up, running E85, and getting another cam. You seem to have a firm grounding in the other areas...

- Rob
I agree 100 percent with filling up the block at least part way. Thats something i completly forgot to mention earlier.
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