A couple of engine assembly questions.

[Jcslocum]

I have my 3.2 stripped down to the rods and will now begin the buildup to 3.4. I have a few questions for the great tribal knowledge of the PP forum:

Do these oil restrictors make sense for a street engine:



I'm NOT going to split the cases. This is a well maintained 100K motor that is nice and clean inside. I will be replacing the rod bolts tho.

I will be installing ARP rod bolts and inspecting the rod bearings closely. Is there any trick to doing the bolts in place? Specific order of removal/install to make it go easy?

Can I reuse the existing copper rings from the cylinder if deck height needs to change? I have new ones, just wonder if this is acceptable practice.

Thanks for any input!

[Eagledriver]

I don't like the restrictors. I think they make the oil pressure too high. The engine oil coolers are getting old and high oil pressure can make them leak. I haven't tried to do the rod bolts in place but it shouldn't be hard. I would reuse the copper gaskets if they are in good shape. I like to use a non-hardening sealant on them to prevent leaks.

-Andy

[Jcslocum]

Andy,

Thanks for the input. How much do you think they raise the Oil pressure overall?

[E Sully]

The restrictors are a controversial subject. It seems Porsche found that there was excess oil going to the cams and heads. The restrictors limit oil to the top end, and in turn increase low end pressure to the crankshaft. Overall pressure is not going to be increased since the oil pressure relief valve rating is not affected, so I don't see how it would increase the risk of hurting the oil cooler. It only increases low end pressure to the bottom end. You will find some who feel there is never too much oil flowing to the cams and won't use them. I used them when I rebuilt my '86 3.2 engine with no problem. Considering Porsche has superceded the fitting, I would think they determined it was beneficial for early engines.

[930/66]

Originally Posted by E Sully

It only increases low end pressure to the bottom end.

I have also the restrictors, my low end pressure is 0.5 bar higher as before (warm engine). High Pressure is like before. I have the restrictors for 10 years mounted in my Car an no problems with it.

[Flat6pac]

My point for the restrictions is, I would more prefer to loose a cam than a crank especially in a 3.2.
Bruce

[Jcslocum]

OK, there seems to be fols on both sides. I will probably install them as I prefer the higher pressure in the bottom end too.

Another small need for info:

Does anyone put anti seize on the rocker shaft bolts. I do not expect to take them apart in the future, once they are installed but man were they TIGHT! I went thru 2 Allen wrenches. Good Allen wrenches not HF crap. So, these are long bolts that can tolerate some anti sieze. Are you guys lubing or not??

[Flat6pac]

The rockers are too tight but the need to seal the oil leaks and keep the shafts on location is a must. Just lube the bolt to tighten, I would install the rocker shaft seals for extra sealing.
Bruce

[Jcslocum]

Bruce,

I have the seals already, thanks. I want a very close to zero leak engine.

I found lots of little areas leaking as I disassembled. The big surprise was 1 cam tensioner rubber line was just flopping around and the back of the cam chain housings. All had failed epoxy and were weeping all over.