so i went to check out an fd today i gues the dealership is having it check out since they got it at an auction the interior and outside look pretty good a few dings and the interior smell i dunno old i guess. so i asked the mechanic what did the compression test come out too he said 175% and this is on a stock fd i dunno the mileage though it said mileage exempt on the ad cuz they dont know the true mileage. when i heard that sounded like bs wat do u guys think? im gonna test drive it on weds possibly the mechanic should be done checking it out.

 

175% does not compute

 

What does 175% mean? Was that inches of mercury or something?

At sea level 9:1 is ~132 psi. That would be optimal.

 

well im pretty much at sea level so does this probably mean this guy doesn't know what he's talking about?

 

oh he juss said 175% so isn't that pretty high for anything?

 

175%, what the hell is that?

 

I think his *** is what is doing the talking

 

If he said the compression was 175%, then yes he doesn't know what he's talking about.

 

I think I'm going to have a stroke trying to figure out what he meant

 

Call them back and ask what they meant.

 

LOL This says it all.

A percentage would make sense if it was less than 100.

So with his #s I get 231 psi.

If you want something done right, you have to do it yourself.

 

well what the measure meant of the compression percentage cuz i thought it was a percentage but people talk about over 100% and i dont know how you can have over 100% compression

 

i hope you didnt pay for that compression test

 

haha no it was a mechanic that i guess the dealer is in cahoots with

 

 

Is this car at a Mazda dealership? If so that explain alot of things. LOL

 

what would be the lowest compression acceptable? when I check out this one fd im getting a compression test done on it if I like it before I buy it, and wondering what the lowest acceptable test rating would be on the engine.

sorry if im jacking the thread, something you might want to know as well though.

 

11 is the highest possible. It used to be 10, but then Mazda started making them go to 11.

-Max
enjoying the unitless measurement humor

 

But couldn't you just make 10 better and then call that 10? Yeah, but ours go to 11!

 

6.5 Kgf/cm2= about 92 psi (low limit for decent performance)
7.0 Kgf/cm2= about 100 psi (book spec)
8.5 Kgf/cm2= about 120 psi (really nice numbers)
9.0 Kgf/cm2= about 128 psi (killer #s)

175% of book spec would be
12.25 Kgf/cm2=175 psi

 

There he goes again folks. Always giving 110% to the forum!!