Last week I finished installing the valves and springs in the heads and setting the installed height for the springs based on the required spring pressure for the custom camshaft. Today I installed the heads, cams, timed them to the proper lobe center angle, and installed the intake and exhaust. I'm a little stuck at this point because the 993 cam towers appear to have two different casting based on the years they were produced. My core engine is an early 95 and the mechanical rockers do not fit in the cam tower properly. The mechanical rockers are .007" wider than the hydraulic rockers and in cylinder 2 & 5 they just don't fit my cam towers. It appears that the later 993 cam towers are wider and the mechanical rockers fit fine. So, I will need to mill off .007" on my mechanical rockers for them to fit properly before I can finish installing the engine.

 

Pretty cool center exhaust. What are you going to do about mufflers if you need them?

 

awesome, how long between rebuilds for your race motor, and how much bhp?

 

From that picture it looks like it's going to be LOUD.

c

 

I assume the car will be loud, but then isn't a proper race car supposed to be? I always wear hearing protection while driving so I don't think it will bother me. I have a second set of headers with a muffler so I'll probably just swap back and forth. The center outlet headers are the last iteration Champion Motorsports built for their RSRs back in 98 and have been dyno tested and made specifically for the RSR sprint engine of that time. We'll see how well they work.

I am planning 60-80 hours between teardown and inspection and I am expecting 380hp on 93 octane street fuel. This is the baseline engine and most likely next winter it will get torn down to have some of 9Ms pistons and possibly cylinders installed. The engine will be used as a development platform and this engine just provides a baseline for comparison.

 

awesome, always look forward to your updates!

 

Cool. When's the estimated first drive date? Anyone going to be there to take pics and or video?

 

I had originally targeted May 17/18 at Watkins Glen, but that date is quickly slipping by and it is not looking good for having the car completed in time. So, the first event will be the Zone 1 48 Hours at the end of June at Watkins Glen. I just sent my application on Saturday. I think I'll be way too busy to take pictures or video.

 

Nice let us know maybe I'll make a trip

 

An update on the rocker arms. I did some additional checking and I found the cast rockers to vary inconsistenly in width from 1.010" to 1.021" for the new set I had and an older set I had. Ironically the one rocker I picked out of the new lot to do the cam timing was 1.011" which is the same as the factory 993 rockers. The cast 964 rockers just don't seem to have the same build quality as the 993 part and I would have prefered to use the 993 part, but didn't want the hydraulic lifters. I did look at machining them to accept the manual adjustment, but just didn't have the time or patience to do that at this point. It appears that the 964 cam towers are more tolerant of the wider inconsistencies than the 993 cam towers. So, I made a fixture and put each of the rockers in the lathe and turned them down to 1.010" which I felt was a better clearance value than the 993 factory rockers. I'm turning the engine to a higher rpm so I wanted a little more clearance. With the additional clearance, they just feel better.

 

Gorgeous car and engine!

 

I wondering if you had the headers treated with a ceramic/metallic coating?

 

Thanks Jean, I know how much you have enjoyed the 965 body.

The headers are bare 321 Stainless without coating. The second set of headers I have are coated.

 

Love the intake set up.When I see EFI with single cylinder V-Stackes it reminds me of the good old days with carbs.

 

nice car cant wait to see video of the car!