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Join Date: May 2006
Location: Tampa,FL
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i don't think you'll want to go any bigger on the idle jet.
double check the linkages to the carbs. one might be adjusted too long; holding the carb open just enough to raise the idle. adjust the carbs on a fully warmed up engine. set the air intake using the syncrometer with the linkages disconnected.
Old 10-27-2010, 12:15 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #61 (permalink)
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Thanks everyone for your input. The timing was the answer. At 3000 rpms my timing was 26 degs. Changed it to 32 readjusted the carbs and its gone no more stalling at a stop. Amazing thanks again everyone.
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Jerry McAbee
1967 912
1968 912
2002 Tundra 4x4
Old 10-28-2010, 10:33 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #62 (permalink)
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Hi Jerry, I walked out of a local Bakersfield business today and was pleasantly surprised to see your creation sitting in the parking lot. The pictures don't do it justice. Your wife seemed pleased with your handi-work too! Thanks for being as detailed as you are with the posts.
P.S. the engine sounds amazing.
Old 11-02-2010, 02:00 PM
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Here is the picture I took of Jerry's 912.
Old 11-02-2010, 02:04 PM
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Thanks Scott I am honored that someone from my home town recognized my car. My wife has been driving it to work sense the weather is good. I think she likes it. Its a little strange not having the car here when I get off work to tinker with. I plan on having the car on a dyno this weekend really curious how much hp it puts out. My guess from what I have researched should be around 100 or so. I will post the results.

Thanks again
Jerry
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Jerry McAbee
1967 912
1968 912
2002 Tundra 4x4
Old 11-02-2010, 04:45 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #65 (permalink)
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dyno at md automotive

Today I drove my car to Westminster to MD Automotive about 150 mile to dyno my car. What a blast. Mark is a great guy. The car ran perfect and got 20 mpg even after about 20 dynos.

Without going into to much detail we tried a 120, 122 and a 125 main and played with the timing. The end result was a 122 main and 34 degs timing with top #s at 98.52 HP and 96.65 torque.



Here is a video we made of one of the passes

YouTube - Jerry's 1967 912 dyno at MD **********

Thanks Mark for the use of your dyno.
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Jerry McAbee
1967 912
1968 912
2002 Tundra 4x4
Old 11-07-2010, 12:09 AM
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Its been a while since I finished my engine build. As of today I have put 2,414 mile on my new engine. This being my first 912 engine I have learned a lot.

As far as the long block goes I really like the setup

JE pistons 86 mm with cast iron cylinders
331s cam
lightened flywheel
Oil bypass

The engine revs fast but has is very drivable power.
The oil bypass keep the engine cool plus give an extra quart of oil.



The biggest head ache I have had is with the carburetors.

The rebuild done by 356 Carburetor Rescue was very nice. The only problem I had was the accelerator pump diaphragm dried out.

So if I could do it again I would have spent a lot more time bench testing the accelerator pump volume, and the float levels. I would have a variety of main jets to test with also.

It has take 2000 miles to finally feel like I have these dogs dialed in. I had one set of accelerators putting out .80 mls and the other putting out .40 mls. I have them both set at .65mls for cold weather. I adjusted the floats so at high rpm the fuel just starts coming out the level screw hole.

I could really tell a difference with accelerating from cruising speed no hesitation just nice power. But I was still having a problem with the engine wanting to die on deceleration coming to a stop. I have adjusted the timing it helped but was still there. I was using 122 mains I had ordered some 125s and installed them and the dieing at a stop is gone. The power transition is smoother also. When I tried the 125s I had borrowed for the dyno the 122 had more power. Maybe more HP doesn't always mean better driveablity if thats a word.

Also this little tool was very helpful in measuring the accelerator pumps. If anyone knows were to get one I would like to have one this is Walt's at Comp Engineering


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Jerry McAbee
1967 912
1968 912
2002 Tundra 4x4
Old 01-13-2011, 10:16 PM
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yikes! they used to carry one for about $15. the other porsche vendor beginning with "S" . part # 000-721-025-10
you might also try to call about this one products

Last edited by BryanM; 01-14-2011 at 05:20 AM..
Old 01-14-2011, 05:16 AM
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Looks to me like a typical graduated glass test tube used in the science. $15 should buy you a lot of 12 for regular glass. I guess this means carb adjustments are a science...

I can't believe you put over 2000 miles on your rebuild already. Must be the SoCal weather. Nice work!!
Old 01-14-2011, 06:03 AM
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And now ?
How many Miles since you rebuildingthe engine ?
I'm rebuild my 69 engine....

JLC
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356 sold now for 66 kg sold now for 66 912 US import sold now for 69 912 barn find US import, in the 911 world with an US 79 SC
Old 11-30-2012, 01:33 PM
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oiling gasket

Quote:
Originally Posted by Jerry1 View Post
Installing timing cover

Lube all gears with assembly lube
Install all seals in case curil-t will help hold them in place
Install seals on oil tube. (tapered end should face the opening of the seal)
Test fit gasket( I had to punch out for dowels on the case)
Curil-t case install gasket curil-t gasket install timing cover
Torque to 18 lbs




There are 4 seals don't forget the little black one in the center.









Install oil pump gears and cover.






Hi Jery, and all member, is it absolutely necessary to oiling the gasket ?

JLC
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356 sold now for 66 kg sold now for 66 912 US import sold now for 69 912 barn find US import, in the 911 world with an US 79 SC
Old 12-01-2012, 09:37 AM
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Hi JLC

I have over 12,000 mile on the engine. Thanks for asking. I believe the sealer is to help with oil leaks.

Here are some pic with the new paint.


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Jerry McAbee
1967 912
1968 912
2002 Tundra 4x4
Old 12-01-2012, 04:51 PM
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Hi, are you still here Jerry? I have a question re 912 engine, and need opinion!
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Old 06-07-2017, 11:03 AM
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Quote:
Originally Posted by hoover View Post
Hi, are you still here Jerry? I have a question re 912 engine, and need opinion!
What's our problem ?
jlc
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356 sold now for 66 kg sold now for 66 912 US import sold now for 69 912 barn find US import, in the 911 world with an US 79 SC
Old 06-18-2017, 04:45 AM
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Thanks for response, problem now solved. I had an issue with the crank ring bearing, it stopped the crankcase halves closing but traced the problem down to the locating pin.
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Old 06-18-2017, 07:42 AM
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Sorry Hoover I didn't have the notification set. I hope you got it worked out. If you have any other questions please let me know.
Jerry
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Jerry McAbee
1967 912
1968 912
2002 Tundra 4x4
Old 07-23-2017, 01:42 PM
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Hi Jerry, thanks for responding, I got the cases closing nicely now. Thanks also for your offer.
With regards.
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Old 07-23-2017, 01:53 PM
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Hi Jerry, i'm recoming for one little question !
Where are you bought the main bearing ? Pelican ? alu or steel NOS or new product ?
Cheers.....happy new year !
JLC
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356 sold now for 66 kg sold now for 66 912 US import sold now for 69 912 barn find US import, in the 911 world with an US 79 SC
Old 01-13-2018, 02:28 PM
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Hi rapido

Competition Engineering supplied them. "Competition Engineering - Expert Porsche machining for 50 years".
Jerry
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Jerry McAbee
1967 912
1968 912
2002 Tundra 4x4
Old 02-21-2018, 06:48 PM
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