2.7 CIS Engine Rebuild
 

Good Morning.

I am attempting to re-build my 1974 2.7 CIS engine (no car) fingers X, and I have so many questions... that the book by Dempsey doesn't go over, but I will keep it short.

I want to convert the CIS to Carbs but I have read in that the pistons are designed/shaped for CIS. Will I have to change the pistons? I know I will have to get my distributor re-curved and a low pressured fuel pump for this build. This there anything else I should be aware of?

Secondly, The stock compression is 8:1, I was thinking of putting JE pistons with a compression of 9:5 as a replacement. Can I just substitute those and not have to worry about changing out my heads and cams?

Thanks,
Cam

Started Last Night, Super Excited :D
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You will want to go with a more aggressive cam to take advantage of the higher CR and the improved inlet flow from the carbs. The CIS cams do not have enough lift.

A set of E or S cams, depending on the type of driving you plan to do, will make a world of difference.

Subscribed- I'm doing the exact same thing with my '76 "s" engine- I have Zenith carbs coming (I'd love to go with PMOs or Webers, but am on a tight budget)... I just closed up my cases (case savers, new mains, etc) and just got my heads back from Rothsport (beautiful work, Jeff gave me a funny look when I suggested I might stick with CIS!)

I had also purchased a used nicasil P&C set (thanks Tom!) but I'm leaning towards seeing if I can pick up the JE set as you suggested...

Curt

Just completed the first step :D

Now just need to purchase some JE Pistons for the next step. Any deals out there?

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Wow! Looks like you've gotten quite a bit done. Hope you can detail some the work completed already.

Have you done anything inside the case? And how'd you get get it so clean?

I got really lucky with this engine. The internals were absolutely perfect. I think what happen was that the oil cooler just lost its pressure and just stared spewing oil everywhere. All the major upgrades where done, casesavers, oil pressure relief bypass, the baffling was already cut, etc...

My cousin has a tranny shop with 2 parts washers and a solvent tank, I was probably there for at least for 12hrs. Everything got washed by hand and thrown into the parts washer, PS those things are amazing saved me a lot of time. The case haves were the worst and I ended up washing them 4 times in the parts washer and solvent washed 3 times. Everything else got washed twice.

I like that beautiful orange fan with black center and black housing. The rest of it is great. I'd suggest the E cams for every day tractability and mileage; the S cams for more aggressive RPM and lower mileage but with smile from the wailing engine until you go on a long road trip. It's called the trade-off for a reason--Zioo

Just finished with the second section of the re-build. I have a new found dislike for "C" clips. I took a few shots to the chest and even had one shoot across the garage and land in a spider's web.

The pistons are JE 90mm 9.5 CR and they fit pretty well. Now it's going to be a couple weeks for the machining of the heads and c-shafts. Suggestions on where I should send my parts?
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I am sticking the engine in my '66 912, should be a fun lil ride.
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sigh....
why does machine work take so long; doesn't go well with my A.D.D.


So in the meantime I installed my engine air baffles. http://forums.pelicanparts.com/uploa...1288147184.jpg
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Got the machine work back today !!!!!!

Started on the pre-assemble...

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me being excited !!!
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pre-gaming what the finished product would semi look like
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Does anybody build 1974 2.7's to concours level any more? If they do so, do they start with a restoration and then move on to concours? Given that the advice is to stay away from 74-77 Porsche motors and rebuilds, how many of these tens of thousands of cars with magnesium cases and Bosch K-Jetronic fuel injection are left on the planet in their undisturbed originality? Zioo

Does anyone have the part # for the 1974 CIS microswitch? I've put the word microswitch into the Pelican search engine and have come up negative. Did Pelican forget to add the english word to their part number search on this one? Thank you -- Zioo

I just found it after 3 hours of searching the internet: the elusive part number for the 1974-1977 microswitch. Wayne, please add the word microswitch in your parts search for the following parts numbers for your members and users: 911 613 106 00. It is featured by one of your competitors as G91161310600. Cost is just over $100.00. This is apparently an esoteric piece of information. Hopefully by adding it here, it will wind up on Rennlist as well--Zioo

Awesome build! I have a very similar setup in my 76. the car is a ton of fun and surprisingly quick.

update
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now I just need to figure out how to wire it to the 912


or stick it in the 21 window......

This is just crying to go in the 21-window VW.

In ’72 I collected all the pieces to put a paltry 2.0T in a then-new ’72 bus.
Done right, your 2.7 would ‘transport’ you to another dimension.

There are quite a number of very experienced Pelicans who have done this ‘right’. John Walker comes to mind.

Research what it will take to make this happen.
Leave your SWB ’66 912 stock.

Best,
Grady

I can not wait to see you driving with this new engine, so cool!
William G.

subscribed

Nice work, as I am going through this next month, where did you source the pistons and cams if I might ask.

Bought the pistons from Top End Performance via ebay (got a pretty good deal), then did a will call at JE in Huntington Beach.

One of my buddies gave me the "E" cams to use, we just did a switch-a-roo my CIS for his.

I am planning on installing the engine this weekend, EXCITED, if all goes to plan....