cyl. comp.

[Frankenstien93]

what is the stock compression on a KA i have 150 all across. i cant get the damn car to keep running and im trying to figure out why

..........i suppose that it doesnt really help that its like -20 out side
Modified by Frankenstien93 at 5:30 PM 2/17/2006

[Frankenstien93]

im just trying to figure out why its not starting i will idle for about a minute but if i put any gas to it it will die instantly i was thinking that it was flooding so i took out the spark plugs and turned it over a couple of times to push everything out and to no avail. im all out of ideas so any help would be good.

stock fuel systemnew plugs & wires

[Nismo_Freak]

What are all the main management mods done to the car? You have to give us a better picture of what you are working with.

It's spelled Frankenstein btw.

[hek1620]

is over 190 bad? thats what i have.

[Frankenstien93]

i havent put any managment in all i did so far was put the turbo in (t3/t4) fmic and all i wanted to do was start it to move it and it ran like 4 days ago and now it wont run but i think its so damn cold out here but w/e

and yes i know i spelled it wrong thanks for the hint lolbut i still dont see why it wouldnt start but i dont know if anyone here has to deal with extreme cold

[fabio420]

over 190 compression? bad? that's as high as I've heard it. That's a good thing.where u at in hialeah, hek1620?

[hek1620]

like where do i stay? by the gratigny and red road(57ave). why?

[Frankenstien93]

not to jack a jack but has anyone had any problems dealing with there car in cold weather.

[s13drft89]

you might have fuel fouled your plugs, from flooding the motor, i have done that on new ngk iridiums, go down to your local autozone or parts stare pick yup some 6 dollar ngk plugs, and yes 6 bucks for four. try it out

[Frankenstien93]

yea i have bosch platniums and new wires and that helped and i put the "heet" in my car and i had it running good for a minute but i think its just so damn cold outside its rediculous out here.

[fabio420]

I'm in fla, so I don't really have cold days issue here, but I have heard from others that cold will make the engine be bitchy.

[Frankenstien93]

yea i just threw more of that heet stuff in and it worked ok plus it got warmer here (10 above) so its ok for now

[SonyPete]

Maybe you have some really thick *** oil, thought not sure if that would effect anything since the crnak doens't really trudge thorugh the oil much.

[Chezedik]

Wow, where to start... Uhm, KAE or KADE, it doesn't matter, compression is WAY too low. Since you have turbo'ed, I would be willing to bet that you popped the piston's ring lands, or better. Did something catastrophic happen before this, overheating, pinging, etc.? This really is way too vague.

[GEO]

I have 195 across the board.. anyway, if you have an safc, try adding fuel in the 1000rpm area.

[Chezedik]

How will the SAFC affect compression?

[Mustangs_Suck]

Wow, where to start... Uhm, KAE or KADE, it doesn't matter, compression is WAY too low. Since you have turbo'ed, I would be willing to bet that you popped the piston's ring lands, or better. Did something catastrophic happen before this, overheating, pinging, etc.? This really is way too vague.

lol what

I've been running for a good year with 145 compression in all 4 cylinders on my stock turbo'd DE. Idles perfectly, no smoke, no bogging. nothing.

[Frankenstien93]

KA24DET nothing to my knowledge has happened to make me think the motor is shot i got it started and it sounds good off throttle but when i get on it it makes a strange sound its not a knocking its hard to describe ill have to get a video of it

[Chezedik]

Stock compressiopn is 179, lower limit is 151. No more than 14psi variance across the cyls. So either you are doing the test wrong, or your engine is in pretty rough shape.

[Frankenstien93]

how can you do the test wrong? you just screw the tester in the plug hole and turn it over right?

[Chezedik]

Was the throttle open? Did you remove the intake? Was the IACV working right? Was it done warm?

Those are ways you can screw up a compression test.

[LEMHEAD16]

How about a write-up on how to do a "Proper Compression test"

[Frankenstien93]

it was done when it was cold and the throttle was shut

[Chezedik]

That could cost you 30 psi. Get the engine to operating temp, then disable the fuel system (to prevent wash of the rings, this is superior to disabling ignition). Install compression tester, crank it for 15 seconds, no more than 20. During this time, you need to be holding the throttle open. I bet your numbers get better.

[Frankenstien93]

thanks alot i know i am a noob at this so thanks for the patience

[Chezedik]

No prob, that's how we learn. As for Mustangsuck, I would be willing to bet he did the test the same way. Because otherwise, unless he was running under 8:1 on a lot of boost, there is no way his car is running well with that kind of low compression.

[pr240sx]

My way of doing a comp test

Warm up the engine fully. A short drive is recommended.Disconnect the ignition coil wire.Disconnect fuel injectors (instead of removing the fuel pump fuse, because the system is pressurized and when you crank the engine, the injectors will open)Remove all spark plugsInstall the gauge and crank the engine while pressing the accel pedal all the way down.Repeat for the remaining cylinders.

You are looking for matching numbers instead of specific pressure.

[Chezedik]

That is everyone's with the exception that you are going a little far on the redundancy for the disabling the engine, disabling the injectors would probably be plenty.

[pr240sx]

I disconnect the ignition wire to prevent any zaps or pretty sparkes while I am cranking.Nissan ignitions gives quite nice reminders.... je je

[Chezedik]

I guess that's true.