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Morrie's Avatar
 
Join Date: Nov 2001
Location: Austin, TX
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Smile Engine Build Advice

Hi Guys,

I am a tail dragger... 912E guy with a carbed 2.0. I am looking for some real world advice and know you folks will have the most practical and useful info.

This summer I will be tearing down the 2.0 to freshen it up a bit. It runs very well but compression is edging down towards the 90-110 range so I know its time before I cause harm.

What I want is a well mannered car that I can primarially use around town and country touring. I want a balance between economical parts and reliability, and would like to hear your thoughts on what to do and what not to do. Here's some thoughts I have that I would like some input on.

P&C: Flat top, dished, or domed? Seems most are dished some, lowering compression ratio. What you you folks recommend for my application?

Cam: I have the stock FI cam in there now, this needs to go for something more suited to carbs. What and where?

Heads: Who do you trust to rework your heads and what should I expect to pay if they are not cracked? If they are, do you get them repaired or try and hunt down better ones?

Carbs: I have a set of Weber 44s and a set of 40s. I think the 44s are too big for my intended use. Do you agree?

I am pretty comfortable with what and where as far as the old 356/912 motors, but need a bit of coaching for the type IV.

Thanks! Looking forward to hearing what everyone has to say!!

MorriE
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68 912 Coupe, 76 911S SR Coupe "The Clown Car", 04 BMW 330Ci Cab, 08 Acura MDX "Porsche Support Vehicle" - to be proven!

Gone but remembered- 89 944S2 SR Coupe, 76 912E "Green Rat", 67 912 outlaw, 68 912 Coupe, 87 924S, 02 Ford Explorer - you served us well!
Old 03-08-2007, 06:29 PM
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You could do far worse than poking around on http://www.aircooledtechnology.com and looking into their engine kits.

I'm guessing (just a guess!) that the 40s are the more appropriate size, but I know people who like the 44s as well.

Heads: Len Hoffman at Hoffman Automotive Machining (HAM). http://www.haminc.biz . Be prepared to pay real money, but the work is evidently worth it.

The Web 86 is a good grind for a carbed car, and we do sell Web-cam products. But Jake has more specialized cams.

--DD
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Last edited by Dave at Pelican Parts; 03-09-2007 at 06:43 AM..
Old 03-09-2007, 06:40 AM
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Jakes cams also have a special facing grind that he figured out to make the cams last longer (less wear).
Some of his cams have different exhaust duration to cool off the heads more which really helps CHTs.
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Old 03-09-2007, 11:40 AM
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Jake's amazing stuff

If you have the cash to shell out I am a firm believer that Jake makes the absolute best motor money can buy, bar none.

I am more along the lines of careful disassembly, inspection, repair, and reassembly. I know I need P&C, re-ring is never a good plan on these things, 616, Type IV, or otherwise. I also expect the 2.0 L heads will be cracked. Pretty much a give I would imagine with as hot as this engine has been and as many miles as it has gone. I guess a good place to start would be an engine gasket set, get my 40s all prepped, and get a set of Jakes econo P&C. I don't need to go fast, just want to go... :-)

MorriE
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68 912 Coupe, 76 911S SR Coupe "The Clown Car", 04 BMW 330Ci Cab, 08 Acura MDX "Porsche Support Vehicle" - to be proven!

Gone but remembered- 89 944S2 SR Coupe, 76 912E "Green Rat", 67 912 outlaw, 68 912 Coupe, 87 924S, 02 Ford Explorer - you served us well!
Old 03-11-2007, 08:26 PM
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I can help you- no matter how simple the build is.
Build the engine to a 2056 with my KB piston/cylinder kit, use my 9530 cam with those carbs and run 8.5:1 CR.. This will net you 125HP with stock rebuilt heads from Len Hoffman.. DO NOTuse the econo P/C kit if you want longevity-I sell them only for low cost builds for guys that don't have much longevity in mind. I am very close to discontinuing these components due to their quality.

I did the same thing that you have in mind 5 years ago with my 912E, the engine was built primarily with used parts except our heads, KB pistons and my 9530 cam- that was 125K miles ago.
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'64 356C Outlaw,'76 912E,95 993,89 964 &'88 Carrera
Old 03-12-2007, 11:44 AM
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2056 CC from Jake

I just finished a 2056 rebuild on my 912E (Jake has one too) and do as Jake says!! My engine runs great and it gets the HP that he tells you it gets. The torque is the thing, very flat from 3000 to 5000 RPM. Give your heads to Len Hoffman. These guys know their stuff!!!!
Old 03-12-2007, 07:13 PM
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Ok,

So lets say I have a case all machined with new bearings. I've got new pushrod tubes, the "good" seals, a pair of Weber 40s all boiled out and rebuilt and a "decent" 009 disty. My exhaust quest has ended with a what I would assume to be a rather restrictive pair of bus heat exchangers which give me toasty heat. I believe my major remaining purchases are below, then the heads. For a 616, getting heads done runs about 300 each. Is that in the ballpark for 2.0 heads? Am I better off trying to scrounge a pair of 1.8 heads? I know, so many questions.....

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96mm KB Piston and Cylinder Stroker Kit #6330

Manufactured by AA, these cast iron cylinders have been fitted with the finest Keith Black hypereutectic pistons. Kit includes pistons, rings, 22mm pins, and keepers for a 78/80mm stroke. #6330

Our price: $599.00
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Aircooled Technology Custom Camshaft with lifters

Here we understand the benefits of a proper camshaft for your Type 4 engine. For years we have worked to improve the Type 4 from camshaft developments and have created many profiles for general and specific applications an effects. To make our camshaft program as comprehensive as possible we d...

Our price: $275.00
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2.0L Porsche Gasket Set #44

Full gasket set for 2.0L Porsche engines.
*Please note*
This gasket set does not include the front and rear seals. They should be purchased seprately. Part numbers 4 and 8.

item #44

Our price: $75.00
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68 912 Coupe, 76 911S SR Coupe "The Clown Car", 04 BMW 330Ci Cab, 08 Acura MDX "Porsche Support Vehicle" - to be proven!

Gone but remembered- 89 944S2 SR Coupe, 76 912E "Green Rat", 67 912 outlaw, 68 912 Coupe, 87 924S, 02 Ford Explorer - you served us well!
Old 03-15-2007, 08:32 PM
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Have Len rebuild the heads, but it won't be for $300!
Ditch the 009 and use the stock dizzy or a Mallory as 009 have a lousy advance curve for a type4.
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Old 03-15-2007, 09:00 PM
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The last 616 heads I rebuilt cost more tlike 1500 bucks for the pair... A 300.00 price just means that all the old valves were being used as well as hardware- thats a huge No No... Valves for a 616 engine can cost up to 100 bucks each!

For a very in depth head rebuild for 2.0 heads, including all new hardware, valves, springs, seats, guides and specialist attention you can expect to pay around 1,000.00, or at that point stepping up to a set of brand new heads based on our CNC program is a wise decision... Heads are not cheap for these engines when they are thoroughly rebuilt. If you choose another cheaper route you could have a failure again in less than one month- it happens almost daily!

The components you have chosen from my store look like solid choices, I will work with you to choose the proper camshaft that best fits your needs.

You need to do some research on the proper valvetrain upgrades that should be utilized with my camshaft. This can be researched on my forums or by listening to my 4th Dimension Radio show that we did on valvetrain.
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Jake Raby
Flat 6 Innovations and Aircooled Technology
IMS Solution Inventor
US Patents:8,992,089/ 9,416,697/ 9,687,974/ 9,909,369
'64 356C Outlaw,'76 912E,95 993,89 964 &'88 Carrera
Old 03-16-2007, 06:28 AM
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If 500 each includes everything you say, then that is very reasonable. My parts price is around 2000 now to rebuild the top end plus a cam. If I can get the short block I want for a nice price, I may be out the door for around 3K. That would not be bad considering how little I have into to the car initially.
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68 912 Coupe, 76 911S SR Coupe "The Clown Car", 04 BMW 330Ci Cab, 08 Acura MDX "Porsche Support Vehicle" - to be proven!

Gone but remembered- 89 944S2 SR Coupe, 76 912E "Green Rat", 67 912 outlaw, 68 912 Coupe, 87 924S, 02 Ford Explorer - you served us well!
Old 03-16-2007, 09:17 AM
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