Low Compressions?

[BLITZ-26]

Ouch, sorry to hear it. On the upside you can now build it (or get it built) the right way and enjoy some reliable motoring.

Well not that engine block anyway......

[SargeRX8]

It must be a rebuilt or recondition motor. Something like this sounds like a build fault rather than wear and tear.

[Rolls]

rod bolts don't just snap for no reason, you either have to accidentally downshift to 2nd and do 10,000rpm or build issue.

[toffy]

rod bolts don't just snap for no reason, you either have to accidentally downshift to 2nd and do more than ~10,000rpm or build issue.

Fixed , i'd guess that having a painted blue block it had a build issue . OP what were you doing when it went pop?

[Slattery Gts-t]

Well im pretty sure it happened just as i went from 2nd to 3rd so high up in the revs near redline

And this block is shagged it has a chunk broken off near where the oil squirter use to be lol

[Rolls]

Sounds like assembly issue or faulty component then. I guess the previous owner could have overreved it badly and fatigued it and all it needed was a bit more stress to finish it off though.

Guess you will never know the true cause.

[Slattery Gts-t]

Actually it was definitely near redline in 2nd

My boss keeps giving it to me because he told me to lower the boost but i didnt and he thinks thats what made it pop. The studs wouldnt break on a power stroke because all the force would be on the crank would it not ?

Im pretty sure the rod bolts where the cause there both cleanly snapped, if the rod broke first surly the the bottom of the rod would still be bolted to the crank

[Rolls]

Are there signs of detonation on the pistons? If not then it had nothing to do with the boost level.

What turbo/boost were you running? Was it tuned for that boost or did you just randomly turn it up without checking it was safe?

[Slattery Gts-t]

No i wont ever know the true cause all illl know is the engine destroyed itself (with my influence), i do give the car a hard time a fiar bit but who doesnt

The previous owner didnt seem like the kind of bloke who would thrash a car but who knows

Edited January 8, 2012 by Slattery Gts-t

[Slattery Gts-t]

Was running a highflow from MTQ at 15 psi on vortex 98 and there was no sign of detonation, i tune it myself for the time being using a wideband and an emanage blue, WOT is around 11.5 to 12.0:1 AFR and iv pulled a few degrees of timing from the whole map as it has a mines ecu

Edited January 8, 2012 by Slattery Gts-t

[Slattery Gts-t]

Well havnt i had bad luck after bad luck

I purchased an engine off a member on here for $700 without the turbo, anyway after spending a weekend putting it in and running into a few hicups i was really looking forward to having it going again. I started it up and all seemed good so i took it for a drive and noticed it was blowing smoke and after 100kms it had used over half a litre of oil also oil temps would sit at about 95 degress while i was cruising, i thought the smoke might clear so i drove it around for a few hours covering another 150kms or so and the smoke wouldnt clear and progressively got worse

I kept driving it and about a week or so later i was driving to another town, I was accelerating up a hill then it started missing so i pulled over and it sounded like a wrx and was blowing more smoke than ever so i turned around and took it home. I pulled all the plugs out and number six was missing the electrode, i then went ahead and did a compression test and got 140 psi from 1-5 then come to number 6 and it had 65 . I continued driving it to work and back due to it being my only car until it leaked hot oil from somewhere onto a coolant line to the turbo melted through it and made a real mess so its now parked up yet again. A friend of mine generously gave me a fairly decent car for free so i dont have to rely on the skyline as my everyday car

I stupidly forgot to do compressions before i started it but judging from the smoke it had issues from day one, I have since sold one of my bikes to purchase a good engine. I Brought one from a japanese engine imported for $1700 ready to bolt in, it has a factory turbo which i will be using so i can zero out everything on my emanage and run a factory tune.

Lets hope i have more luck with this one!

[Odium]

Wowwwww... you wrote "I kept driving it" way too many times for my liking... I was wincing after I read the second one, but you kept driving it!

amiriteoramirite?

[Slattery Gts-t]

I didnt really have a choice it was my only car at that point in time plus where i live there is no public transport and it was still running

The way i saw it the engine was a lost cause and if it completely $#!t itself i wouldnt have been worried (I covered 1300Kms on 5 and a half cylinders),

I have the option of stripping it and rebuilding it with forged bits now

[Rolls]

Was it a neo for $1700? that is hell steep for an r33 25.

I sold a forged short block 25det for $1k, pistons, bearings, rod bolts etc, almost $4k of parts in it, took almost 4 months to sell it even though it was running. If you haven't picked it up yet keep looking imo and just make sure you do an oil analysis AND a compression test.

[Slattery Gts-t]

Was it a neo for $1700? that is hell steep for an r33 25.

Oh really? I did do some shopping around and it seemed to be around what you pay for one with 3 months warranty, plus its already payed for and on its way

Oh well as long as its good thats all im worried about at this stage

[Rolls]

If it is a half cut then it is pretty good, but if it is just the block then yeah rip off.

Edited February 9, 2012 by Rolls

[DVS JEZ]

How much timing have u pulled from the mines map using the emanage?

Did u ever check it on a dyno?

Did u use your original injectors or the ones that came with 2nd hand motor?

Did u get them cleaned and flow tested?

Im thinking either a weak cyl 6 injector causing a lean out mixed with detonation in cyl 6 has busted the ring lands.

I recommend running the emanage with a stock ecu rather than the mines or atleast tune it on a dyno.

Also get the injectors cleaned and flow tested

[Slattery Gts-t]

I pulled 3 degrees from the whole map

I didnt have it checked on a dyno as the nearest one is over 250kms away

I used the ones that come with the motor and no i just put the engine in and ran it

I agree it could very well have been a lean out and detonation either way its shagged

The car come with the mines ecu and i didnt get a standard one but im swapping it plus cash my way for a standard one in a few days

[Slattery Gts-t]

If it is a half cut then it is pretty good, but if it is just the block then yeah rip off.

its not a half cut just a complete engine, I dont care if iv been ripped off all im worried about is getting it back on the road with a reliable engine im not going to wait around until i find a good deal to save a few hundred dollers

Prices seemed to range from $1200 to $2500 for a complete engine with warranty so i dont feel iv been ripped off