i just bought a 1986 rx7 it runs great but when i accelerate it smokes when im shifting in to the higher gear but only when im at like 6000 rpm and then it stops after i shift what causes this and how do i fix

 

NA Oil ring test:
While stopped, hold the RPM at 4K for about 5 seconds.
Snap close the throttle.
When the tach gets down to 1K, gun it a second.
Look for an exhaust cloud of blue-white smoke.

 

then if thats not the case what else could it be
and if it is how hard are those to change

 

then if thats not the case what else could it be
and if it is how hard are those to change

 

then if thats not the case what else could it be
and if it is how hard are those to change

 

Other possibilities:
Disconnected MOP linkage. (oil metering full on)
Too thin base oil like 5W-30.
Light weight synthetic oil.
Worn out oil seals. (They should go 200,000 mi in an NA)
Side irons warped from overheating.

 

what oil should i have in there

 

if you want to fix it, rebuild.
however, i have had good success with the following methoid to put off rebuilding as long as possible:

1)change your oil to 15w 40 diesel oil. run for 100-200 miles
2)change to castrol 20 w 50, with 1.5 quarts of MMO. run for 1-2k miles.
3)change to castrol 20w 50. drive her till she blows, then rebuild.

this wont eliminate smoking but it will help a lot.
another optional step: before the 15w 40, fill the oil with 2 quarts of oil, and the rest mmo. start car, run for 30-60 secs. shut off, wait a minute, do it again. do this about 10 times. then change oil to 15w 40 and follow the rest of the steps.

reasons for this:
MMO dissolves carbon, swells seals.
15w 40 diesel oil is very high detergent, which helps to also dissolve carbon and other deposits.
castrol 20w 50 is a superior oil which lubricates, cools and runs better

pat

 

hey my 7 smokes at high rpm too.....i use quaker state high mileage oil..10-40...it helped alot....smokes less and runs smoother...compared to the regular 10-40 i used b4.....