Jump to content
SAU Community

Recommended Posts

Hi Guys

testing compression on my rebuilt motor returns about 100psi across all 6, so my question is is this normal with these cams and have others experienced the same numbers

I have checked some guys having the same results but didnt find too many

did you drop the oil and see excess of fuel in oil ? (fuel running down the side of the cylinders)

A loose build i.e. large clearances. or even rings. Who did the build and how was it fired up / run in

100psi is far to low for a fresh rebuild.

Edit:

Not to cause concern, more to make you even more wary and check it out thoroughly.

I run Type B's not that that has much to do with it.

After my first build it was around 85 because the builder had made a mistake which caused a catastrophic failure.

one of the symptoms before the failure was fuel in the oil.

2nd build by CRD and is around 170 across the lot.

Have you tried 2 different gauges when measuring

Edited by Sinista32

I did the rebuild evrything was in spec initial startup was with normal mineral oil idling for about 30 min

I then drained the oil and started driving but the conditions was a bit rich and battled with tuning then after another 200km i drained the oil that was also smelling of fuel

some new oil now and smelling of fuel again after 150k

its still stock bore with stock pistons and new rings bores was honed before assembly for bedding

I wouldn't call fooked just yet. The boys on here are pretty good.

It maybe a case of pulling it out if your in doubt of any of the work.

You rebuilt with all stock internals.

Were the rings put on factory spec / positioning and double checked ?

Sitting there idling doesn't do anything for ring seal. Got to get the gases in behind the rings to push them against the bore otherwise they're just "going for the ride".

http://www.mototuneusa.com/break_in_secrets.htm

Give that a read.

^^^ What he said. It may be too late but give it a shot anyway. Drop the synthetic oil if that's what you've got and put mineral oil in. Do not labour the engine but give it plenty of welly - up to 6000 and button off and repeat. Watch for overheating and leaks and if ok continue for half an hour - then retest.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Even more fun, leave all the ADAS stuff plugged in, but in different locations, hopefully avoid any codes!   And honestly, all these new cars with their weird electronics. Pull all the electronics out Duncan, and just shove an aftermarket ECU and if needed a trans controller in, along with a PDM. Make it run basic but race car styled!
    • To follow up a question from earlier too since I had the front bar off again (fking!) This is what is between the bumper and the drivers side wheel And this is the navigator side, only one thing but its a biggy! So basically....no putting coolers in the wheel arches without a lot of moving other stuff. Assuming I move to properly race prepping this car I'll take that job on and see how the computers respond to removing a whole bunch of ADAS modules
    • So I prepped the car for another track day on Wednesday (will be interesting to see coolant temps post flushing out and the larger reservoir, with a forecast of 3-14 being 20o cooler than last time I took it out). Couple of things to mention; since I am just driving the car and not taking a support vehicle, I took the rear seats out and just loaded the back up Team Trackday style. Look at all that space! To cover off removing the rear seat....it is weird (note the hybrid is probably different because it wouldn't have folding rear seats) Basically, you remove the lower seat base, very similar to a r series but it is a clip that pulls forward to release the base rather than it being bolted down. Easy Then, you need to remove the side section of the rear seat on each side. There is a 14mm head nut at the bottom of the side piece, the it slides upwards off a hook at the top to release; you also need to unhook the seatbelt from the loop at the top. Then the centre piece is weird. You need to release/fold the seats forward with the tab in the boot on each side From there, there are 2,x12mm headed bolts holding the rear of each seat to the folding bracket, under the trim between the rear seat and the boot (4x christmas tree clips there, they suck). The seat is out but you can see where the bolts attach to the bracket
    • As discussed in the previous post, the bushes in the 110 needed replacing. I took this opportunity to replace the castor bushes, the front lower control arm, lower the car and get the alignment dialled in with new tyres. I took it down to Alignment Motorsports on the GC to get this work done and also get more out of the Shockworks as I felt like I wasn't getting the full use out of them.  To cut a very long story short, it ended up being the case the passenger side castor arm wouldn't accept the brand new bush as the sleeve had worn badly enough to the point you could push the new bush in by hand and completely through. Trying a pair of TRD bushes didn't fix the issue either (I had originally gone with Hardrace bushes). We needed to urgently source another castor arm, and thankfully this was sourced and the guys at the shop worked on my car until 7pm on a Saturday to get everything done. The car rides a lot nicer now with the suspension dialled in properly. Lowered the car a little as well to suit the lower profile front tyres, and just bring the car down generally. Eternally thankful for the guys down at the shop to get the car sorted, we both pulled big favours from our contacts to get it done on the Saturday.  Also plugged in the new Stedi foglights into the S15, and even from a quick test in the garage I'm keen to see how they look out on the road. I had some concerns about the length of the LED body and whether it'd fit in the foglight housing but it's fine.  I've got a small window coming up next month where I'll likely get a little paint work done on the 110 to remove the rear wing, add a boot wing and roof wing, get the side skirt fixed up and colour match the little panel on the tail lights so that I can install some badges that I've kept in storage. I'm also tempted to put in a new pair of headlights on the 110.  Until then, here's some more pictures from Easter this year. 
    • I would put a fuel pressure gauge between the filter and the fuel rail, see if it's maintaining good fuel pressure at idle going up to the point when it stalls. Do you see any strange behavior in commanded fuel leading up to the point when it stalls? You might have to start going through the service manual and doing a long list of sensor tests if it's not the fuel system for whatever reason.
×
×
  • Create New...