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

    • FWIW, as well as a basic immobiliser/remote unlock (all basic units give you those 2 things), I would also install a 4g tracker in any car I cared about. Just hide it anywhere that won't be found in a rushed look and preferably get something with a built in battery backup so it stays online for a while when the battery is removed or flat While its not a car, when our car trailer was stolen in that den of crime Sydney about a decade ago, the cops were watching from the bloke's neighbour's lawn within about 2 hours until he started swapping the plates and putting up the gumtree ad.   Obviously it is still not undefeatable (eg parking it up for a few days somewhere without sky sight) but it greatly improves your chances of getting it back quickly and with less damage
    • Instead of magic keyphrases I wonder if something can be done with auto complete. Similar to how user names are handled already. When you type '@' and follow with letters, it'll search across all usernames. It might work to have the same for forum topics. Some key to trigger it and then text search across all thread names and it'll insert the name and URL when pressing enter.
    • Hmmm.... It's actually a bit weird. Here's the key bit of the diagram. I've circled what I'm pretty sure is the high beam indicator on the cluster. It appears to be just in parallel with one of the high beam lamp globes. Meaning, that however the high beams get lit, the indicator should also be lit. So there shouldn't be any difference between being on normal headlight main beam, or just flashing. I've followed the physical diagram (which is not so easily summarised in a single snip, so I didn't put it up here) and it agrees with what you can see here. If you struggle to follow this crap....let me explain some of it. I always struggle when I first look at this - even though I have looked specifically at this more than once in the past. We'll start with the flash. The flash is triggered by pulling the dip switch back, right? That is indicated on the diagram by the P position on the switch block labelled "Light SW", on the RHS of the snip. The bottom-right most terminal is connected to ground. That's that wire line going down to the bottom. The next terminal up is connected to the bottom terminal when the switch is pulled back. That provides ground to wire LA33, which is connected to the coil of the relay in the middle of the snip, "Headlamp relay (2M)". That relay always has power on the other side of the coil, from fuse #19 above it. When that relay is triggered, the two main headlamp fuses #32 & #33 above feed through the relay down onto wires LA31 and LA32, which are connected into the wires that go to the main beams, LA04 and LA06. The cluster indicator is connected to LA32 also. When the main beams are on normally, the light switch ("Light SW" again) is in the M position. Power comes in for the left and right sides on LA34 and LA36, via the other light switch (the one on the binnacle, called "Light SW (Instrument)" on the diagram). Obviously that switch needs to be in the 2nd position, because that's headlights. 1st position is parkers. The same main headlamp fuses #32 & #33 feed through that switch, out via LA34&36 to the stalk switch, and of out of the stalk switch via LA04 and LA06 to the headlamps. From there, it is no different to the flasher version. I really don't know why they bothered with the flash relay. They probably didn't want to add another contact in the stalk switch - but I'm damn sure that's what I would have done. Just reverse the order of power feed, so that it goes from the fuses to the stalk switch first, and add another contact for flashing. Everything would have worked just the same, but less complicated. /bitchrant
    • I think the solution Pac posted in the other thread is the way to go with the top screen; I have an ADM Q50 and I only use it for 2 things: 1. Reverse or front camera as triggered automatically by Reverse selection or the front sonars, and you can also call up the front left (or front) camera when parking by hitting the camera button on the centre console if necessary 2. Navigation. I can assure you that getting hold of a 10 year old nav system is utterly useless. The ADM system still has Inifiniti dealers marked (always give me a good laugh), is missing all new freeways, uses fixed speed by road type to determine arrival time, no traffic/re-routing, no speed cameras, no user reported cameras etc etc you get the idea So, Pac posted in the other thread about a box that plugs into the USB C and gives you full Android OS to run whatever modern/connected nav you want on the top screen, and it still automatically switches back to function 1 above when required because it runs within the head unit. The other modern alternative is the latest version of the Tesla screen like this:  https://www.aliexpress.com/item/1005007511322502.html?spm=a2g0o.productlist.main.25.33cefEZifEZibq&algo_pvid=cdae429c-aa8d-437f-a436-c727fee85461&algo_exp_id=cdae429c-aa8d-437f-a436-c727fee85461-12&pdp_npi=4%40dis!AUD!2181.36!1265.19!!!9834.81!5704.20!%402101c71a17362022663526105e36d7!12000041077843545!sea!AU!163137612!X&curPageLogUid=F9811g8oqx5H&utparam-url=scene%3Asearch|query_from%3A But I haven't looked into whether it is compatible with Australian 4G bands yet so it may require a separate 4g dongle to provide data
    • In the 32 race car, I basically run what Gary told me and it is lovely across a range of conditions which is what I needed. I've got revalved bilsteins, adjustable solid sway bars, adjustable bushes all round. Just looking at Neil's R33 GTST and it has pretty much the same on board, Gary Bilsteins, Selby/whiteline sway bars.  Gary knows suspension generally and these cars specifically very well across street, street/track and track only use and gives a very well balanced set up. Just be aware his preference is for light springs and heavy sway bars, there is another school of though (eg MCA) that prefer lighter swaybars and heavier springs/shocks. The evo I raced had that setup and it was also very nice so there are multiple ways to skin cats.
×
×
  • Create New...