exuast smoke question
12-25-02, 11:12 PM
#1
it WILL run
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exhuast smoke question
I am looking at buying a 82 rex
but I have one question
the seller says that is smokes on start up
any input on what causes this
it has 200k on the motor
so worn seals would be fine as I plan on rebuilding the motor (wanna be familiar since i've never had a rotor)
but I have one question
the seller says that is smokes on start up
any input on what causes this
it has 200k on the motor
so worn seals would be fine as I plan on rebuilding the motor (wanna be familiar since i've never had a rotor)
Last edited by wwilliam54; 12-25-02 at 11:21 PM.
12-25-02, 11:26 PM
#2
Rotary Freak
smoke on start up is like comon termanology in the rx7 world,
its a pretty natural thing, doesnt mean anything bad at all,
it just what you tell someone who is new to rx7's when you are selling them one so they dont get scared away when they see a little smoke on the start up.
on the other hand 200k is some pretty damn high miles and i'd expect to do an overhaul real soon.
keep in mind with that many miles some main engine parts may need to be replaced as well, ie rotor housing, etc....
its a pretty natural thing, doesnt mean anything bad at all,
it just what you tell someone who is new to rx7's when you are selling them one so they dont get scared away when they see a little smoke on the start up.
on the other hand 200k is some pretty damn high miles and i'd expect to do an overhaul real soon.
keep in mind with that many miles some main engine parts may need to be replaced as well, ie rotor housing, etc....
12-25-02, 11:30 PM
#3
it WILL run
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thxs alot
ill check things out
check the compression, etc.
but to even run at the many miles says something about the care it got
ill keep a 13b in mind as well
ill check things out
check the compression, etc.
but to even run at the many miles says something about the care it got
ill keep a 13b in mind as well
12-25-02, 11:32 PM
#4
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Color of the smoke is also an indicator.
Blue smoke = burning oil
Black smoke = burning fuel (rich air fuel mixture)
White smoke = burning coolant (white with no blue tint)
Blue smoke = burning oil
Black smoke = burning fuel (rich air fuel mixture)
White smoke = burning coolant (white with no blue tint)
12-25-02, 11:33 PM
#5
Rotary Freak
Originally posted by wwilliam54
thxs alot
ill check things out
check the compression, etc.
but to even run at the many miles says something about the care it got
ill keep a 13b in mind as well
thxs alot
ill check things out
check the compression, etc.
but to even run at the many miles says something about the care it got
ill keep a 13b in mind as well
also most rotary's will last to 200k,
no special attention required, doesnt mean that the engine will be in good condition though
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12-26-02, 12:44 AM
#9
aheadau
I have always used a (modified) "regular" comp. tester. Because the pulses are so quick, and the needle is hard to see, I look at the "big end" of the needle. It is easier to see and note the position. Then just look straight across the dial to see where the small end was going. I'm guessing there are probably many differences in the various gauges that make some easier to read then others.
12-26-02, 01:01 AM
#11
aheadau
Yeah, but as was pointed out, if you use a "regular" the needle will be bouncing quickly. I don't think you get a reading "higher" than it really is, most likely a little lower. Of equal importance is the all 3 "pulses" are equal. 2 high and 1 low may mean a stuck side seal. 1 high and 2 low may mean a bad apex seal. Both rotors should read the same as well.
12-26-02, 10:59 AM
#20
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the way i did my compression test is.... hooked the thing up in where the plugs go of course, then i was told to go full throttle (i dont know why) and turn the key until it cranked 8-10 times. to get an accurate reading you really should run the engine and get the temp up so the apex seals expand and all, then test it when its warm. When i tested mine cold, it was bad, i started thinking rebuild but when i tested it warm it really wasnt that bad.
--eric
--eric
12-26-02, 11:02 AM
#21
it WILL run
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thx
ill be alright once i get a little more familiar with rotaries
Ive rebuilt a few recipricating motors
and im really tired on haveing to get head work done
ill be alright once i get a little more familiar with rotaries
Ive rebuilt a few recipricating motors
and im really tired on haveing to get head work done
12-27-02, 01:03 AM
#25
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Originally posted by Project84
Color of the smoke is also an indicator.
Blue smoke = burning oil
Black smoke = burning fuel (rich air fuel mixture)
White smoke = burning coolant (white with no blue tint)
Color of the smoke is also an indicator.
Blue smoke = burning oil
Black smoke = burning fuel (rich air fuel mixture)
White smoke = burning coolant (white with no blue tint)
uh-oh :p
... the last few days the cars been a little hard-starting... I dismissed it as just the colder weather, but there is definately smoke when it does, white smoke at that... Doesn't smell like cat **** tho, smells like gas, definately white tho... *wonders*