Pengo

just ran a compression test on my car and this is what i got:

200 200 210 200

now i'm glad they're all fairly close, but i was wondering if these number are too high (carbon buildup) or too low for a d16z6. hopefully this will handle the boost thats coming in the mail well

TurBoXBirD16

how did u do ur compression testt??

i only got like 165 to 170 arcross all cylinders

Pengo

car was already warm. pulled fuse for fuel injection out. took out all spark plugs. screw tube into spark plug well, attach to gauge (i have the quick release one). with clutch and gas held down all the way, crank engine 5 times. i was doing like 8 cranks cuz i read from somewhere else to do it that many times, but then some places said 5, and my friend who was watching the gauge always stopped me at 5-6 cranks anyway cuz the needle already settled. repeat same for all other cylinders.

the ones that got 200 for me were actually exactly on 200 on my gauge, and all were definitely over 180 and under 210

this on a d16z6 with 80,xxx miles and constant maintanence. oil changes every 1000 to 2000 miles

Pengo

so is this decent or what?

Mike_C

Did a test on a car I was gonna buy and here is approximtely what I got:

120 130 145 140

This was a d16z6, and needless to say I didn't buy it.

mafioso102

i was running 225-250 in each on my mini me, so that sounds ok

schecter

i have a d15b7 3xx,xxx miles, 92 civic lx 4dr, 195, 200, 200, 192 dry comp test, injectors pulled as well as fuse and pumpo kill switch, all plugs pulled, WOP 3-5 cranks....

Jimster480

200 is very good.

shogee

thats a very good engine you should be glad as for a turbo look up specs for the compresion ratio, a compression test doesnt tell you any thing about compression ratio, it's somewhere around 9:1 d series dont go past 10:1, good for a little boost

Jimster480

Z6 has 9.2

sde780

My d15 was 150,180, 150, 150 when I got it. your numbers are great

schecter

i'm going to rebuild it this winter, get a rebuilt shoc non-vtec head, and then turbo, custom stronger rods, a6 cam, y8 head gasket. 10lbs boost

boxeocampeon

that seems really high i think its supposed to be at like 135 or something. mines low its 114 in 3 cylinders and 107 in cylinder 1

93egSLEEPER

cause your car is running like crap right? probably smokes.
OP 200-225 is normal for a z6. 185 and below means the motor is getting tired and will possibly need rings soon.

93egSLEEPER

you are on the verge of having catistrophic failure or just having your motor die on you in the near future. it take a MINIMUM of 100 PSI to create combustion and burn fuel. below that you will develop a dead cylinder, have predetination and ruin pistons. being 7-14 points above that is not good.

Jimster480

yea that motor is pretty wasted.

scrambled_EG

That's a pretty healthy D!

Sr420Det

Why are you gonna rebuild it and why not a vtec head?

Jimster480

if the motor is the healthy then there is no point in rebuilding it. If you want to build the motor I would say to either sell the block that you have and buy another one to build it (since yours is so healthy) or sell the pistons/rods after u take it out.
But since its so healthy you could boost it and make 200WHP with no problems and not worry about it.

boxeocampeon

i have a d16y8 tho. what does the manufacturer say the compressions supposed to be at?

Jimster480

no idea. But it should probably be around that of a Z6.

boxeocampeon

i called honda and they said it should be around 170 and minimum at 120...****!!! i was gonna buy new pistons anyways but how much you think itll cost to get them installed and machined at a shop?

Jimster480

idk, i know the machine shop i go to charges 10 per piston to put pistons on. Idk how much for rods.

schecter

non-vtec gives me delivery of power all throughout the rpm range with these motors i believe it to be more benificial to go non-vtec for boost.

Jimster480

no it does not. non-vtec motors are more suited to lower end power. That is the whole point of VTEC. To have regular cams for low-mid range power and VTEC cams for high end power. VTEC also helps you spool turbos because the cams are more aggressive when VTEC activates.