i have a rebuilt engine right now that runs.. but i compression test shows that my front rotor has low compression in it. is it still safe to drive it? will i mess up my rotor sooner or later? and i do you think its possible to fix it? and how much would that be? thanks for your help

 

How much miles on the rebuild?


-Ted

 

about 8,000 miles

 

What are the compression numbers?



-Ted

 

front rotor-- 1)5.5 2)5.3 3)5.8 @233 RPM
rear rotor---1)6.7 2)6.8 3)6.5 @245 RPM

 

It's a bit low, but still within spec.&nbsp I would wait till you hit the 10,000 mile mark to see if it comes up a bit.&nbsp Mazda factory spec allows 20psi of variance between front/rear rotors, and you're right at that spec right now.


-Ted

 

thanks for the help mann.

 

i brought it to a dealership and they told me to get a new engine but i wasn't sure if i should cuz the engine was kind of new already

 

What kinda engine?&nbsp Who did the rebuild?


-Ted

 

13-b engine and HAYES ROTATY ENGINEERING did it

 

my car is a 88' turboII

 

Did you do a proper break-in procedure?
Does Hayes offer a warranty on our engine?&nbsp If they do, how much longer do you have before it runs out?&nbsp 12k miles?



-Ted

 

i recently bought it off someone.
they do offer a warranty but only off the original buyer and its gone through two owners already.
the warranty is 24,000 miles

 

is it possible to fix it?? so i dont have to buy a new motor??

 

Do a search on Hayes, they do not have a good reputation in the rx-7 community.

 

how do i do a search?

 

should i just get a new engine?? or wait till 10,000 miles and do another compression test and see if its messed up?? thanks a lot for the help

 

upper right hand corner. Just type in a subject and hit search. You can search specific sections of the forum by selecting one from the drop down list.

 

Might want to try some ATF.

 

whats ATF?

 

again with the stupid ATF treatment...


Why would an engine with only 8000 miles on it have carbon build up I ask you?

 

about atf, does it do anything else but gum up your spark plugs and help remove carbon?

 

yea it also screws up your oxygen sensor and gets the fire department to come to your house.

It works great on OLD engines with LOTS OF CARBON as a LAST RESORT.

It is not a fix all end all.
It can't hurt though if you have the money for new plugs/oxygen sensor...

 

is their another way to build compression on my front rotor?

 

someone correct me if I am wrong...but

the compression of any rotor cannot be changed, you are within spec so I wouldn't complain to much.

The thing with these engines, is that if you have a seal leaking out into or out of your engine, that can only be replaced in a re-build, same goes with coolant seals...

When that engine was rebuilt, chances are it was the front rotor that went out (just speculation) and that they re-used the same rotor/rotor housing. A lot of re-building places do this...but if it is a HAYES rebuild, your within spec (which you are) and you are not burning or leaking coolant/oil then I wouldn't worry about it.