Hi all, RE: 1992 Porsche 964 Engine Rebuild
Considering we are not looking for high horse power or spending a lot of money, What input would you offer for our project?
Background:
We are in the process of rebuilding a 1992 964 3.6L engine for my son's 1978 911 race car. The car has been running a 3.2L Aase built stock spec engine for about 5 years - it is still very strong and a class winner for 2 years. But, we need more torque and minor HP increase to still be competitive within the NASA PTA Class. Based on our weight HP is limited to 248 RWHP and torque lower than HP.
Findings:
We purchased a used 3.6L and have disassembled it to inspect and measure. The engine had a known leak down test indicating rings - but we also found valve issues in #5 & 6 and #5 rod bearing excess wear. Cylinders are out of tolerance spec also.
Approach:
After discussing the issues with our local Porsche Indi shop and Don at EBS(and researching the Forums) we have decided to:
1. send the cylinders to EBS for refinishing and increase to 102MM
2. send heads to local racing engine machine shop for reconditioning-guides,grind,etc.
3. send crankshaft and rods to machine shop for reconditioning and microfinishing
4. send cams to Webcams for regrind to 20/21 - and maybe rockers for recondition
5. replace with JE 12.5CR 102MM piston set
6. replace with ARP rod bolts
7. replace with EBS racing valve springs
8. replace head studs
9. replace rod, main and IS bearings
10. replace flywheel with Patrick 964/915 custom conversion
11. replace front pulley with single belt
12. clean and flush case and valve carrier oil passages
13. reassemble by Porsche Indi shop
14. wiring conversion by Indi shop
15. use existing 915 custom built and geared transmission - rebuilt last year
16. use existing custom 1.75" header system
17. use 964 stock intake and DME
18. when conversion to 3.6 is complete take car to Steve Wong for dyno custom chips
I will be posting this thread on several different places for feedback.
Thank you for your time to respond.
Sincerely,
Roy Turner
Phoenix, AZ
A picture of the UPS brown Porsche race car ---
