Borgo by AE 10.4:1 pistons - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 8 (permalink) Old 05-09-2017, 01:03 PM Thread Starter
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Borgo by AE 10.4:1 pistons

I have a set of three excellent 84mm Borgos that were just removed from my three-cylinder Alfa --- scratch that -- from my 2L GTV engine. The fourth got beat up when a washer mysteriously found its way into cylinder #2.

These are 11,000 mile pistons and liners that came out of a well-maintained engine that was running perfectly until the big washer event. I bought a set of Wes Ingram's CP Carillo's to replace the Borgos.

You can still buy Borgos new, but they are no longer made by AE, so if you need one or more replacements to match what you already have, these should do the trick.

I live in southern Washington, near Portlandia.

Gary Williams
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post #2 of 8 (permalink) Old 05-10-2017, 06:55 AM
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post #3 of 8 (permalink) Old 05-15-2017, 10:58 PM Thread Starter
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These are SOLD.

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post #4 of 8 (permalink) Old 05-16-2017, 06:48 AM
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Are we flip-floppers? In the past you have argued against Borgo 10.4's based on John Norman's dyno tests. I was skeptical as most race motors use domed pistons but now after talking to Jim Steck, I think that you were right and I was wrong.

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #5 of 8 (permalink) Old 05-16-2017, 08:23 AM Thread Starter
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Not sure which "you" you are referring to, Ed. Don't think it's me. I don't remember ever arguing for or against Borgos. I don't have the technical chops for that.

I have, however, wished I had not built my motor using Borgos in 2002, when other guys were just beginning to discover that flat-top pistons gave better power because they could be designed for a slightly lower compression ratio, which allowed motors to run with more advance on pump gas.

It will be interesting to see what a Borgo versus Carillo piston comparison will show when I get my car back on our friendly local chassis dyno.

Gary Williams
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'67 GTV
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post #6 of 8 (permalink) Old 05-16-2017, 09:53 AM
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I quoted Andrew.

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #7 of 8 (permalink) Old 05-16-2017, 10:02 AM
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More advance does not necessarily produce more power. My car made the same HP and torque at 34 and 36 BTDC. You just need sufficient advance for the combustion to end at the right time. What I am learning is that with Alfa Nord engines a very high compression ratio can be counterproductive. There are some very powerful motors running with moderate CR's.

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #8 of 8 (permalink) Old 05-16-2017, 10:20 AM Thread Starter
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Originally Posted by alfaparticle View Post
I quoted Andrew.
Ah, mystery solved.

You're way ahead of me on engine tuning, but it seems that high compression, mediocre pump gas, and less than optimum advance conspire to keep a motor from peak performance.

I can't change the quality of fuel. My hope is that the new pistons will bring the best out of my motor in a way that the old-design Borgos could not.

Gary Williams
Washington State
'67 GTV
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