ian kam

ok I have been talking with John about this and following his instuctions on getting my piston rings seal. Now I just want to know if anyone else has had this troulble and if it could be anything else but rings. Car is starting to run fine minor things..but for instance I was waiting in a drive through car running perfect at idle and then all of a sudden smoke(oil smell) from the exhaust heavy smoke. I pull ahead to check it out gone I let it idle while I eat nothing comes back. This will happen from time to time. Any ideas???

hosrom_951

Where do you smell the 'oil smell' inside the car windows up/down? climate control on off?

This may not be related, but i used to get an oil smell on full boost. Did you double check for any minor leaks ?

fast951

Good point Hosrom.. Ian, I think your rings have not seated 100%, you are getiing less smoke now than before so something is "fixing itself" and the only thing that can do this are the rings.. Time for a leakdown test! One thing, are you running a rich mixture at idle?

Many changes have been made to your car, time to start eliminating possible causes.

Ski

Ian what oil are using during your break-in process?

hosrom_951

Guys since we are in the issue of rings getting seated and oil. My friend here is about to recieve his 'newly' rebuilt 944 NA in a couple of days, so how long is the break down period for and what oil should be used?

ian kam

well i took the plugs out all really good except for #2. Alot of oil deposits backed onto plug!! looked down into the cylinder and saw a little oil sitting there. Now I remember a master mechanic told me once burning oil all the time (smoke) rings. Smoke at idle stopped at lights etc...and goes away once driving valve seals ?

Ski

When we rebuilt the track car motor, we used 30wt ND(non detergent) for just under 200 miles, no boost. The compression on the NEW motor when warm was 135-138. When we changed to Castrol 20/50 after getting the 30 wt out, the compression was up to 149-150 on all cylinders with 0-1% leakdown. We ran Castrol 20/50, slowly raised the boost over two weeks, then put it on 15. The car has run 2 DE, now @ 17 psi on 104 race gas, Mobil 1 15/50, 150-149-149-150, less than 1% leakdown. This procedure was recommended by someone I trust and worked well for us; others have said build it and go just use dino oil for break-in and not synthetic.

ian kam

i will book a leak down test this week if it doesnt snow!!! John I put another 120km on last night easy driving no boost!!! Oh ordered that missing intake bolt..only time will tell.

fast951

Ski, He's using 20/50.. Might be a good idea to switch to 30 for a short period. I was hesitant to get him started with 30W as it's cold in Canada..

ian kam

should I go to 30W

fast951

Do a leakdown test first, then decide..

ian kam

well this is the devil it looks okay well off for a drive

fast951

Great looking engine...

David Floyd

Very nice Ian !

Ski

Beautiful Ian, great job!