New engine or Engine restore?
 

I lurked a little and couldn't find the thread regarding this choice I apologize if this topic has been brought up before, which I'm sure it has. I would t mind being linked in the right direction of course :p. Thank you!

So here it is. My engine is a couple miles away from hitting 111,500 miles. Along with my power train, transmission, and differential. I recently did a 6 puck XTD clutch kit swap (big mistake I know) and its holding out ok though it's got some squeeking on engagement. I am going to reswap the clutch for sure. However I was wondering about my other components? Would it be Hester to look for a newer engine or just have the one I have rebuilt? What if I restore my engine and bore out some 4.0L pistons? Anyone else do this yet? Results? Recs? Anything and everything helps except for Cristisism that just makes people feel bad and doesn't get anyone anywhere so be kind on this thread haha :) thanks ahead of time!

Why would you do anything to the motor if you don't have any problems? There are members here with twice the mileage with zero issues. Get a compression test, a leakdown test and an oil analysis. If those come back clean, don't worry about it.

Is there anything wrong with the motor? I'm curious as to why you would think it would need to be rebuilt. 90ST on here has like 250,000 on his Z and it's still trucking along.

:iagree:

If it aint broke don't fix it

Yeah, exactly!! ^^^^

Unless you are wanting to build for big power I would bolt some power on it and go. My oil analyses came back good. with about 235,000 at the time I took the sample. currently about 245,000...

Glad to see someone else driving their car, but yeah no need to pull the engine out for an overhaul yet, unless you ARE having problems, burning a lot of oil or looking to do a big power build.

:iagree:

Now as far as boring it out to a 4.0L, if you're not going forced induction, it's kind of a waste for the cost if you're not boosted. And from what I've read, even the guys running 10 to 13 PSI of boost are still on stock internals and they are getting between 600 to 700 RWHP. But I have a BSME, so I'd consider forged internals for longevity/fatigue when boosted to those numbers, but that could always be done at a later date.

In fact, i'm not sure if there are many companies still around that provide a 4.0L kit. I know Brian Crower still has a kit, but it's at 4.34L which is what I plan on doing in the long run :happydance:

Awe all you guys are awesome! So then in reality it's a waste/unneeded? I was starting to worry about the miles though I've heard these cars go for a while before anything needs to be done haha. Ok, so there's no oil leaks anywhere and the engine runs good it only has a little clicking like noise which I'm assuming are the valves? Other than that I'm worried about my tranny.

Every time I shift there's a squeeking especially on take off. Sometimes, rarely, when I'm going fast and do quick shifts it sounds like something is getting hit in the back of the car I'm guessing it could be the diff. Anyone have this experience before?


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Yeah you're right! I should do some basic tests to see life and quality first! Never thought of that, thank you! :D definitely look into it haha what would you say for tranny and differential though?


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Thanks for the 411 man this definitely helps make a better educated decision :)


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Holy damn that's a lot and I thought I was killing my engine haha do you know how long these engines last on average? I read maybe about 320k?


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i would say to have the transmission mounts checked out, especially if you do a lot of hard launches and have them check the diff. for any leaks around the seals and bushings and such...other then that, the only thing on the motor that you could possibly need is just routine maintenance stuff like changing out the serpentine belt and spark plugs, etc.

:iagree:

Working on finding out...lol I think I have the highest mileage 370 though in the world at this point...so 245k at least? It still runs strong and has no problems with the engine.

Rebuild, keep everything together on a 40th.

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so whats the purpose of going to bigger liter from 3.7L to 4.5L?? bigger compression?
i want to go twin turbo but im not sure if my stock internals can hold. im at 103K miles

If I'm ok you're definitely ok haha if you do a TT kit then I'd say do an e85 conversion also and that'll help upkeep your internals much cleaner and running smoother plus you'll see major power gain on FI.


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Yeah I was thinking that...


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Also! Is it pointless to do an e85 conversion on a NA? I hear it's awesome for the boosters but what about NA? I like the idea of bigger injectors and pump plus I was told that my current tuning requires a bigger pump, uprev proRace


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Everything I've seen E85 doesn't produce much NA but to be honest there aren't a lot of guys that have tried it.

If you do decide to make the plunge PM me I've got a set of injectors I'd be willing to part with for the right price.

Yes. A bigger compression ratio will result in more power. But that's why turbo/superchargers are used, so you can gain power at a lower compression ratio.

I'd suggest going through all of the Single and Twin Turbo threads to see what others are doing. From what I gather, the stock internals hold up, but not everyone is running full boost to ≥1 Bar (≥14.5 PSI) all the time. Most of them set up to almost 1 Bar (~13 PSI) just to see how much power they can produce. They are more than likely using a lower PSI (~8-10 PSI) DD. So we can't fully know how the stock internals will handle such power increases due to fatigue.

You also have to understand that eventually, you'll want to go to better internals. Engine manufacturers will only produce fatigue results based upon their power outputs on a stock vehicle. So a much more in depth FEA study must be done for higher power outputs, which most Turbo/Supercharger companies will not conduct since their designs can go onto various amounts of vehicles.

So, I'd say, just to be on the safe side, account for cost of changing internals/ reworking the engine to a larger displacement upfront, so you know your costs. If you don't do it right away, at least save the money on the side for a later date.

Edit: Also, going with just a larger bore size is much more costly than just stronger internals because of the machining and shop time. That's why most will consider doing that, along with a twin turbo to make sure they get their money's worth.

When searching into this, you might want to also look at a different engine too. But that is for a different discussion.

Uprev, is anyone interested in getting a tuning done for a discounted price? Let me know!


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