gave her a compression check today....
#1
stop flooding ur engines
Thread Starter
gave her a compression check today....
and the numbers are.....
at 250rpm on a hot engine, i got
R1
6.7
6.8
7.1
R2
6.7
6.4
6.9
factory spec is around 8.0 new and minimun is 6.9
so, um, shes uh, erm.....ugh......yeah.
which is weird bc it doesnt idle bad, starts easily and has no real runnin probs. but some of u may remember a thread a few weeks back about me runnin it on the dyno and gettin 160 whp at 6,000 rpm as my PEAK. after replacing the coils i wanted to run a comp check to see where i stand....
um....yeah....there ya go.
its an 06 MT with 29k had the 4206f recall done in november of 06.....
any thoughts?
at 250rpm on a hot engine, i got
R1
6.7
6.8
7.1
R2
6.7
6.4
6.9
factory spec is around 8.0 new and minimun is 6.9
so, um, shes uh, erm.....ugh......yeah.
which is weird bc it doesnt idle bad, starts easily and has no real runnin probs. but some of u may remember a thread a few weeks back about me runnin it on the dyno and gettin 160 whp at 6,000 rpm as my PEAK. after replacing the coils i wanted to run a comp check to see where i stand....
um....yeah....there ya go.
its an 06 MT with 29k had the 4206f recall done in november of 06.....
any thoughts?
#7
stop flooding ur engines
Thread Starter
i did for like 3 months about a yr ago but was afraid of what itd do to my fuel pump so i stopped. i used pettits mix. didnt have any issues, in fact i still dont, but the way the power trailed off after 6k on the dybno made me think twice about the compression.
i work for mazda so gettin my hands on a rotary compression tester is as easy as walking 12 feet and opening a drawer.
im pretty sad about this bc i love my rx8 and its little wankel wonder....i hope its warrantied!
i work for mazda so gettin my hands on a rotary compression tester is as easy as walking 12 feet and opening a drawer.
im pretty sad about this bc i love my rx8 and its little wankel wonder....i hope its warrantied!
#10
stop flooding ur engines
Thread Starter
intake. UR pullies. those r the only engine mods, i went heavy with chassis tuning. changed the oil every 1-2k miles, shell v power (93), saw high rpm daily
#11
kevin@rotaryresurrection
iTrader: (3)
Join Date: Feb 2005
Location: east of Knoxville, TN
Posts: 1,415
Likes: 0
Received 57 Likes
on
35 Posts
Only with the rx-8 did mazda raise their minimum compression standards to ~96psi. With all previous rotary models it has been 85psi. IN my experience, rough idle and hard starting tend to happen in the 90-95psi threshold. This explains why mazda raised the standard. You guys are actually lucky that this happened, otherwise more of you would still be running weak engines until they dropped below the older minimum spec.
The change in spec is not due to the renesis design changes, none of which affect static compression generated.
The change in spec is not due to the renesis design changes, none of which affect static compression generated.
#12
Rotary eXperimental-8
Join Date: Nov 2003
Location: Gander, Newfoundland, Canada
Posts: 1,830
Likes: 0
Received 0 Likes
on
0 Posts
I remember reading your other thread about the lower than expected numbers from the dyno run and it makes me wonder how my engine is doing as well, since I have never had it dynoed before.
#15
Registered
and the numbers are.....
at 250rpm on a hot engine, i got
R1
6.7
6.8
7.1
R2
6.7
6.4
6.9
factory spec is around 8.0 new and minimun is 6.9
so, um, shes uh, erm.....ugh......yeah.
which is weird bc it doesnt idle bad, starts easily and has no real runnin probs. but some of u may remember a thread a few weeks back about me runnin it on the dyno and gettin 160 whp at 6,000 rpm as my PEAK. after replacing the coils i wanted to run a comp check to see where i stand....
um....yeah....there ya go.
its an 06 MT with 29k had the 4206f recall done in november of 06.....
any thoughts?
at 250rpm on a hot engine, i got
R1
6.7
6.8
7.1
R2
6.7
6.4
6.9
factory spec is around 8.0 new and minimun is 6.9
so, um, shes uh, erm.....ugh......yeah.
which is weird bc it doesnt idle bad, starts easily and has no real runnin probs. but some of u may remember a thread a few weeks back about me runnin it on the dyno and gettin 160 whp at 6,000 rpm as my PEAK. after replacing the coils i wanted to run a comp check to see where i stand....
um....yeah....there ya go.
its an 06 MT with 29k had the 4206f recall done in november of 06.....
any thoughts?
#16
stop flooding ur engines
Thread Starter
ok, im likin the input ppl....
i changed 4 coils, the leading plugs (went back to re7c after using re6c, the 6s are a hotter plug and unneeded for crazy driver me) chekced my cat, its front:rear switch ratio is 0.5xx and max is 4.xx so its fine....
i ran the dyno when i was on sunoco 93, the only reason i was on sunoco was for that one tank bc there were no shell v power around when i was empty....i use shell v power 93 but not on that dyno...maybe it knocked and it pulled timing? dunno.
when i ran the comp test i brogutht he car into the shop stone cold, so i let it idle for about 10 mins to get hot, then did the test......think i should beat the hell out of it to get the mop flowin before i do the test again?
that sounds like a good idea bc i was taught if some rx8s were readin low comp after the test they wanted me to run the mop at its highest step ( 60 ) for about 5 mins and then let it idle for a few mins then do a retest.....they wanted the added oil to go in and lube it up real good then do a retest....maybe thats what i should do.............any thoughts
i changed 4 coils, the leading plugs (went back to re7c after using re6c, the 6s are a hotter plug and unneeded for crazy driver me) chekced my cat, its front:rear switch ratio is 0.5xx and max is 4.xx so its fine....
i ran the dyno when i was on sunoco 93, the only reason i was on sunoco was for that one tank bc there were no shell v power around when i was empty....i use shell v power 93 but not on that dyno...maybe it knocked and it pulled timing? dunno.
when i ran the comp test i brogutht he car into the shop stone cold, so i let it idle for about 10 mins to get hot, then did the test......think i should beat the hell out of it to get the mop flowin before i do the test again?
that sounds like a good idea bc i was taught if some rx8s were readin low comp after the test they wanted me to run the mop at its highest step ( 60 ) for about 5 mins and then let it idle for a few mins then do a retest.....they wanted the added oil to go in and lube it up real good then do a retest....maybe thats what i should do.............any thoughts
#17
Rotary , eh?
iTrader: (1)
ok, im likin the input ppl....
i changed 4 coils, the leading plugs (went back to re7c after using re6c, the 6s are a hotter plug and unneeded for crazy driver me) chekced my cat, its front:rear switch ratio is 0.5xx and max is 4.xx so its fine....
i ran the dyno when i was on sunoco 93, the only reason i was on sunoco was for that one tank bc there were no shell v power around when i was empty....i use shell v power 93 but not on that dyno...maybe it knocked and it pulled timing? dunno.
when i ran the comp test i brogutht he car into the shop stone cold, so i let it idle for about 10 mins to get hot, then did the test......think i should beat the hell out of it to get the mop flowin before i do the test again?
that sounds like a good idea bc i was taught if some rx8s were readin low comp after the test they wanted me to run the mop at its highest step ( 60 ) for about 5 mins and then let it idle for a few mins then do a retest.....they wanted the added oil to go in and lube it up real good then do a retest....maybe thats what i should do.............any thoughts
i changed 4 coils, the leading plugs (went back to re7c after using re6c, the 6s are a hotter plug and unneeded for crazy driver me) chekced my cat, its front:rear switch ratio is 0.5xx and max is 4.xx so its fine....
i ran the dyno when i was on sunoco 93, the only reason i was on sunoco was for that one tank bc there were no shell v power around when i was empty....i use shell v power 93 but not on that dyno...maybe it knocked and it pulled timing? dunno.
when i ran the comp test i brogutht he car into the shop stone cold, so i let it idle for about 10 mins to get hot, then did the test......think i should beat the hell out of it to get the mop flowin before i do the test again?
that sounds like a good idea bc i was taught if some rx8s were readin low comp after the test they wanted me to run the mop at its highest step ( 60 ) for about 5 mins and then let it idle for a few mins then do a retest.....they wanted the added oil to go in and lube it up real good then do a retest....maybe thats what i should do.............any thoughts
How did you run the MOP at high output?