Ok So my Jspec s5 t2 motor is sitting on a pallet in my garage. Decided to check compression on it. Now I know I don't have the mazda tool but I have also read many of you don't use them anyway. I also know that to get a true reading the motor needs to be up to operation temps ect ect.. But I figured I could get an Idea of what I was looking at as far as if I needed to rebuild right away. So I hooked my battery up to the harness and turned the motor over And tested the rear rotor first and I did the surge test first and it was right at 85 psi everytime the needle surges then I let go of the button and within the first 3 or 4 surges it went straight to 110 psi Then I did the same thing on the leading plug same readings.

Then to front rotor, and nothing. Zero!!! Any Ideas?

 

probably apex seals stuck from sitting. Mine were, shot some oil in there, turned it over till they freed up. good compression.

 

Correction on the surge PSI it is 25 not 85...

thanks ABC I will try that.... Nice name btw, where all your normal ones taken?

 

No, I hate registering for websites, so lame, so I had an fb at the time, hence ABCDE-fb! tada!

 

Inspect the apex seals through the exhaust first. If they are intact and go ahead an spin the motor up. Drop some oil inside the chamber. check compression from the T plug holes. Cold you should see at least 75psi on all faces. It is not uncommon to find a 100psi on one rotor and 75 on another if this is the running case expect it to blow.

 

Thanks guys, I'll let ya know I'll mess with it tonight.

 

i know that with the "bounce" test, it should be in the 30-35 range, so i think your right in there.

 

30 to 35 range thats one weak motor. It should be 80 to 120

 

Ice we're talking cold, not even in the car. Still weak?

 

Yes

 

Umm... sad...

 

^Yeah, just rebuild it and you'll be set

BTW, I've been to the 1/8mile track in Lakeland a few times.

 

Shh.. dont say that, Our poor poor track...

Yeah I was thinking about rebuilding anyway. The guy I want to send it to is in TN, so I may just attempt it myself...

 

if the 'guy' in tennesse is Kevin landers he does a good product.



BC

 

^Aye, otherwise known as "Rotary Resurrection".

 

lake land huu used to go to church there

 

Where at? I am a lakelander born and raised.

 

that lakeland track is sad lol...my local 1/8 is about as sad here in the bay area lol

 

Ahh, your in largo so your close enough to ft desoto to go to theirs I hear it is sweet.

 

yeah, that one is a very nice track.