just did a compression test

[rtcc]

Hey guys, so I did my first compression test on my 96 and as far as I know there has never been any work done to it. Just pipes and k&N filter.

 

Anyway, hot or cold both cylinders came up right around 100-103. I did it about 5 times each way. That seems like a safe level but I know its on the low side. I borrowed the tester from the local oriellys so I can only hope it was of decent quality, came up the same everytime though.

 

Anyway, noss head on the way and was thinking of the 20cc domes? I did a search but I cant find exactly how much compression they add and what the max compression is for running 93 octane.

 

 

 

 

besides that does it sound like my engine is alright to run for awhile? I really just want to spend money on the suspension at this point.

[fastbanshee8]

It's definately time for a new top-end, with readings that low. If you continue to run it that way, you will probably end up blowing it up, and having to spend alot more money to get it running again. Do it right the first time, so you aren't always wondering how much longer it will be, before it finally lets go.

[Screaming Yellow Zonker]

this might help

 

[rtcc]

It's definately time for a new top-end, with readings that low. If you continue to run it that way, you will probably end up blowing it up, and having to spend alot more money to get it running again. Do it right the first time, so you aren't always wondering how much longer it will be, before it finally lets go.

 

 

Is there a way to tell by opening up the topend if its ok or not? I mean, obviously if there is scrapes or gouges then its no good, but what should the cylinder walls look like? I have never opened up a banshee before.

 

I will get another compression tester and double check everything.

 

 

thanks

[rtcc]

this might help

 

 

Thanks, but whats the highest we can go on 93? I guess thats my biggest thing right now.

[jbooker82]

Thanks, but whats the highest we can go on 93? I guess thats my biggest thing right now.

 

Every motor is different. Some can handle a litte more compression on the same octane with out getting into trouble. Another factor is ignition timeing. Do you have a timing plate or advance timing key. If you dont have any timing advance then you can run a little more compression.

 

I ran my banshee at 150 psi and +4deg timing on 90-91 octane fuel at 2000 ft elevation.

 

Most people will say 150psi and +4 deg is the ball park max for premium fuel.

 

josh

 

PS. Most people also say when you start getting around 100 psi on a stock top end it is time for a new top end.

 

The reason why is parts just get slopy. They are not with in spec. Putting a cool head on will only mask the problem. Sure the compression will be good again but the tolarances still are not. They will continue to wear until they get to the point where ther is a mechanical falure.

[rtcc]

Every motor is different. Some can handle a litte more compression on the same octane with out getting into trouble. Another factor is ignition timeing. Do you have a timing plate or advance timing key. If you dont have any timing advance then you can run a little more compression.

 

I ran my banshee at 150 psi and +4deg timing on 90-91 octane fuel at 2000 ft elevation.

 

Most people will say 150psi and +4 deg is the ball park max for premium fuel.

 

josh

 

PS. Most people also say when you start getting around 100 psi on a stock top end it is time for a new top end.

 

The reason why is parts just get slopy. They are not with in spec. Putting a cool head on will only mask the problem. Sure the compression will be good again but the tolarances still are not. They will continue to wear until they get to the point where ther is a mechanical falure.

 

 

alright thanks, I will cross check with some other compression testers and see what I find, then I will decide if I can tear it down and send it out.

 

No I dont have any advanced timing, everything is stock. Im at 1500ft elevation so I think Ill be alright with 93. If it detonates Ill get some higher stuff.