: Good #'s on a compression test???


SpeedOften
07-01-2007, 03:05 PM
Had 130 in all 4.. I thought that sounded good since they were all the same, but just wanted to double check...

Impaled
07-01-2007, 03:18 PM
Sounds fine, how many miles on the motor?

SpeedOften
07-01-2007, 03:25 PM
Sounds fine, how many miles on the motor?

just under 45k, and boosted..

She's not pulling like normal so I'm trying figure out why.. haven't found a boost leak so not sure what's up..

WUGcatsvt
07-01-2007, 03:42 PM
not 0 like my #1 cylinder has

Rudel
07-01-2007, 03:56 PM
Speed, I know what you mean. I had my SC rebuilt, and she still's not pulling like she use too. Granted, I hit a curb, but still no visual defects. No vacume leaks, no broken tubes, intercooler, etc etc. Wierd. [paranoid]

I asked Tom about carbon build-up, but it's not likely because I burn 93 octane. Hopefully I don't have a bent rod. [scream] So right now the car is sitting at Tom's waiting to be looked at...I hope he can get to it soon.

These are my compression results, but on a 9.1:1 piston and increase stroke.

135, 140, 142, 150. Somethings wrong on my side. The numbers should be nearly the same on all 4 pistons.

Definately double and triple check everything.

jrpasmo
07-01-2007, 05:20 PM
just under 45k, and boosted..

She's not pulling like normal so I'm trying figure out why.. haven't found a boost leak so not sure what's up..

Have you been boosted last summer as well ? Just thinking, if it can be because of warmer temp...or plugs already worn out, air/fuel filter dirthy...

SpeedOften
07-01-2007, 07:49 PM
I'm kinda wondering about the plugs.. I've been boosted since about september? I forget exactly.. Fuel filter was changed out about a month ago and I haven't put that many miles one it since then... I do need to replace the thermostat gasket and the little plug inside of it since I have a leak.. so that could have a factor but I'm checking the level everyday so it's not like I'm running low on fluid...

cayres
07-01-2007, 11:25 PM
that would make sense if you motor was running a bit warmer and pulling more timing than it would runs a bit off..i would check the plugs..your running coppers?

viney266
07-01-2007, 11:45 PM
ALWAYS check the spark plugs. They will tell you so much about how your engine is doing. If you have issues always pull a plug and have a look, it will show you if its lean, rich etc etc. If you have fouled a plug it will never run right till you clean/ replace it.

1turbofocus
07-02-2007, 07:51 AM
ALWAYS check the spark plugs. They will tell you so much about how your engine is doing. If you have issues always pull a plug and have a look, it will show you if its lean, rich etc etc. If you have fouled a plug it will never run right till you clean/ replace it.

Plugs can only be read when a new set is installed , Run WOT then shut off coast in and check the plugs , Once you heat cycle the plugs they can no longer give you the information to get an accurate reading to judge fuel and timing

Tom

viney266
07-02-2007, 10:12 AM
^^^^ Thats true for tuning. I should have mentioned that as well. I did ALOT of two-stroke bike tuning and just always replaced a plug without thought, so I didn't even mention it.The plugs, even with time on them, could still be fuel fouled and need to be replaced. Good point Tom, thanks for filling that in.