my compression results, can someone help??

[shadowdrag]

I've just did a compression test on my 2nd gen GSX and this is how it went. Follow the vfaq, I unplug the 30A to fuel pump, unplug the 3 wire harness by the FPR, install tester and crank the engine for 8 seconds.

looking at the motor from left to right.

162psi........175psi........162psi........175psi

This is when motor is hot.
can some tell me what this means.

 

[GSX26]

hmmm..I'm no expert, but I've always thought that the numbers should be within 5 of eachother. Maybe a leaky hg? Did you crank til it steadied? That's how I've always done it. Maybe retry it.

 

[shadowdrag]

hmmm..I'm no expert, but I've always thought that the numbers should be within 5 of eachother. Maybe a leaky hg? Did you crank til it steadied? That's how I've always done it. Maybe retry it.

I did boost test 4 weeks ago and had excessive crank pressure testing from TB. Today, I've just got the tester and thought I give it a shot. So I crank it all up until 8 seconds or more, and I also did each one of them twice.

These are the actual results, but I have not try using a little cap of oil.

But if it is a leaky HG, how much is it to be done at the shop. I know it seems easy, but the last time my brother and I did it on his 2gen GSX, the whole engine blew 3 weeks after the assembly. It was due to bad timing, cost him = $4500.

So I just rather have an expert do it.

 

[shadowdrag]

Never mine about those test numbers, I forgot to floor the throttle wide open.

Here are the newest results:

170psi........181psi......170psi........181psi....

I forgot to mention that my car threw out a cell of p0335= CAM position sensor malfunction. Is this whats causing my excessive crank pressure?

 

[GSX26]

Sorry I can't help ya out more man...I'm just getting into DSMs within the past year. As for the shop doing it, it will be a lot in labor. The gasket is about 100 bucks, but for pulling the head, they're going to rape you with charges. Maybe just read up on pulling the head. I am reading about it right now because I want to put all arp hardware in there as well as a new hg and maybe new springs/retainers...and if I stumble across some money, I even want to pull the whole thing and throw in new rods and pistons! But, just try calling local places and get estimates if you don't feel confident doing it yourself. Good Luck! Keep us posted!

 

[Meh987]

Those numbers are fine. They're well above the service limit of 130. You are allowed about 15-20psi variance from each cylinder. And what makes you think your crankcase pressure is so high? Is your oil dipstick shooting out?

 

[tsiAWD91x]

your in good shape bro... the specs call for 178 psi for 2g pistons your and the service limit is like 130 somthing psi, as for the extra compression ya might have some carbon build up nothin to worry about uness your annal do some sea foam or what not the only worry for carboin build up are hot spots but... and like meh987 said what makes ya think you got excessive crank case pressure is your dip stick popin out?

 

[shadowdrag]

your in good shape bro... the specs call for 178 psi for 2g pistons your and the service limit is like 130 somthing psi, as for the extra compression ya might have some carbon build up nothin to worry about uness your annal do some sea foam or what not the only worry for carboin build up are hot spots but... and like meh987 said what makes ya think you got excessive crank case pressure is your dip stick popin out?

Well,I did a boost leak test 4 weeks ago and there is just air rushing out from the valve breather, even after replacing two pcv with the original. But now P0335 cell is showing up. WTF

I did some research on-line and a muscle car racing shop said that it is possible to lower crankpressure by advance timing. I am not sure if thats correct, maybe for the muscle cars???