All Read! Just when you think your done....

BigBen · 10-15-2009, 07:18 PM

As some of you know i just recently went turbo. I've been driving around for a couple of months now with the turbo. Felt great in the beginning but has felt sluggish. Oil has been spitting out of the blow off valve but we just thought that the turbo had been bad. Went up to the shop today and wanted to check the compression. What do you know there was no compression in the #2 Cylinder. We didn't take it apart but it seems like one of the pistons is cracked. How strong is the K24? Doing a quick budget to think of how much it will cost to fix it is in the area of 3k. Yes that would be building the engine since I think it is the only way to go.

Your thoughts?

aznboi0204 · 10-15-2009, 07:27 PM

If it costs the same price to rebuild the engine, I say rebuild it because if this happened to one of the pistons, what are the chances it wouldn't happen to the other ones. This way when you rebuild it, you know whats in there and what it is capable of.

EuroRspec · 10-15-2009, 07:51 PM

Rebuild it better than ever. Put some forged internals and never worry about it again.

Benz · 10-15-2009, 08:07 PM

You were hitting 399whp right?? Because no one has ever went that fast * I believe* with a K24 yet, even if they did, it's still in the testing period or they had already rebuild the motor. Even the K20 couldn't play that safe over 300whp. I would strongly suggest you to rebuild the engine with some Skunk2 Stage 2 cams and whatnot, since they are cheap for what they are. Unless you want to go Toda, or hit up Jun and see if they have applications for K24.

kuma912 · 10-15-2009, 08:49 PM

Skunk2 suck. Get some BP or BC cams. And 400whp was enough for a stock motor.Rebuild the bottom end. I don't think your piston is cracked. You might've fried a ring.

tsx4life · 10-15-2009, 09:22 PM

Do it...rebuild...

BigBen · 10-15-2009, 10:02 PM

well I was in a hurry earlier when I was making this thread. My point of the thread was more for a discussion on what their thoughts are for stock motor and it's limits. It is a grey area for most of us since the turbo is new to our cars. I am going to rebuild sleeve,rods, and pistons.

This was also created to let the people that are planning on turboing what the safe limits are to our stock motors.

griffojm · 10-15-2009, 10:10 PM

If you were at 399whp then you more than doubled the stock crank power. That's a lot to ask out of any stock motor, even one made in Japan!

TSX_WS · 10-16-2009, 02:23 AM

Quote:

Originally Posted by kuma912

Skunk2 suck. Get some BP or BC cams.

I definitely agree on that. I read numerous complaints about skunk 2 cams and some other products.

As for the motor.... Well, 350Z motors have their safe limit at 400-450 WHP (Sorry, I cannot name the exact number since I never worked with them closely). That is a 3.5L V6 with 286HP stock output. It more than makes sense that something could go wrong with a 2.4L 4 cyl engine which puts out 200hp stock. In all honestly, I would not push it past 300WHP and 300WTQ if I was running turbo and wanted to play safe. With a built bottom end, it is a different league. Hondata RSX runs 760? WHP with fully built, turbocharged, K20/24 hybrid. Not that it would be a safe daily driver, but I am just saying that the limits jump very high when u build the bottom.

Good luck!

DAYTA · 10-16-2009, 12:30 PM

Damn man, sorry to hear about your issues.

Upgrading the sleeves isn't necessary - RSX guys have been running 500whp+ setups on stock sleeves. However, if you're already doing a full teardown/rebuild, you might as well get everything done at the same time.

I would definitely say you should go with low compression pistons. You'll obviously lose off-boost power, but our stock 10.5:1 compression ratio is way too high to run 17psi of boost. I'd also upgrade the head gasket/studs while you're at it in case you decide to increase the boost past 20psi (which we all know you'll end up doing with a built bottom end).

Are you planning to do any work to the head?

BigBen · 10-16-2009, 01:44 PM

Quote:

Originally Posted by DAYTA

Damn man, sorry to hear about your issues.

Upgrading the sleeves isn't necessary - RSX guys have been running 500whp+ setups on stock sleeves. However, if you're already doing a full teardown/rebuild, you might as well get everything done at the same time.

I would definitely say you should go with low compression pistons. You'll obviously lose off-boost power, but our stock 10.5:1 compression ratio is way too high to run 17psi of boost. I'd also upgrade the head gasket/studs while you're at it in case you decide to increase the boost past 20psi (which we all know you'll end up doing with a built bottom end).

Are you planning to do any work to the head?

eh it is what it is. I hate it esp. since my wife is due in 2 weeks. Right now I have priced the following for the build:

Completely new block (Golden Eagle Closed Decked sleeved block)Bore,hone,decking,hot tank,Fluxed,Balanced within +-.1Gram)
Manley Pistons
Manley I-Beam Rods
Oil Pump
Water Pump
Golden Eagle head studs
OEM Bearings
Eagle Head Gasket
Main Seals

I won't have the money to do anything to the head yet or buy a bigger turbo. I have a t3/t4 with 50trim so the most i'd probably be able to get is around 450 whp.Once I get my financials straight with the baby and the market turns around i'll upgrade the turbo and injectors.