Jump to content
SAU Community

Recommended Posts

hey everyone

i have a Nissan skyline R32 GTS-t 1992 , it has 80 k on the body but the engine was changed by the guy i bought the car from. i did a compression test today as i was just changing the radiator hosing.

these are the scores i received

Cylinder

1-125

2-135

3-125

4-126

5-126

6-139

i wasn’t sure what the rb20det should be getting however , i was thinking some where about 160, would someone be able to let me know what i should be receiving? also how bad are my scores? if scores are bad, is it worth putting a rb25det? Instead of (if expensive) fixing the rb20det.

Thanks any help appreciated

niran

Edited by niran
Link to comment
https://www.sau.com.au/forums/topic/215335-compression-test/
Share on other sites

There are 2 ways to look at it...one is that the overall figure is rather low...even for the rb20 which runs lower compression...another way to look at it is that the variation between the cylinders is not too big so its not too bad...

I'd get it checked again with another compression gauge and then go from there...comp gauges can very very inconsistant...my guess though is that it might be quite tired...

a mate of mines rb20(170,000k's) returnd 110 across all 6 on a comp test(snap on comp tester)... his motor has copped an absolute caining.. we havent been able to kill it yet its not so much about the reading as for some reason all the comp testers ive used have returned different results compared to others

you also have to remember an rb20 has very small stroke/bore dont expect it to have similar compression on the tester compared to a rb25/26 or a 30 mainly look at how even it is across the motor.. but in saying dont pay to much attention to the pressure reading.. if you havent got 3 didgets as the read out.. it might be something to look into

thats my thoughts anyway..

True thanks for that man.

i went to kyp today they said for a half cut with a rb25det, gear box, and tail shaft and so on will come to $2000.00-$2500.00. i was thinking wether to do that or what would you guys reckon if i re built the RB20DET with aftermarket internals as it would probably come around the same price.. any way let us know what you guys think.. Wether i should ( once this engine dies) go and do the rb25det conversion or re build the rb20det?

thanks every one

niran

hey mate when i bought my 32 GTS4 '93 i got a comp test done on it b4 i bought it..The odo read 97,000kms but who knows how tru that is.. any way i got 155 across all cylinders which the mechanic said its pretty good...i also did a leak down test and got 8% across all cylinders which he said is very good too. hope this helps

  • 1 year later...

Wow this is an old post i never checked it until now, dw that was when i was a bit immature. The rb20 is still going strong but I’ve been doing some research in comparison into the rb20 vs rb25 like 2 quick said the rb20 shows great results in strength specially as the rods are shorter and also the engine can rev out a big higher..

However the rb25 can spool bigger turbo’s and get bit more power out off it compared to what the rb20 can. I’m still in the process of really deciding guess I’ll keep on reading and keep asking people on this forum what they would choose and why..

Thanks guys

Niran

Wow this is an old post i never checked it until now, dw that was when i was a bit immature. The rb20 is still going strong but I’ve been doing some research in comparison into the rb20 vs rb25 like 2 quick said the rb20 shows great results in strength specially as the rods are shorter and also the engine can rev out a big higher..

However the rb25 can spool bigger turbo’s and get bit more power out off it compared to what the rb20 can. I’m still in the process of really deciding guess I’ll keep on reading and keep asking people on this forum what they would choose and why..

Thanks guys

Niran

RB20 rods are longer than RB25/26.

Cheers

Gary

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...