105 Headers Comparison/shootout! - Page 5 - Alfa Romeo Bulletin Board & Forums
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post #61 of 126 (permalink) Old 02-21-2019, 09:33 AM
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Photos?
Yeah sure why not, here some pics from today
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post #62 of 126 (permalink) Old 02-21-2019, 09:40 AM
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As stated previously I already have a stinger pipe
Open pipe, then!

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post #63 of 126 (permalink) Old 02-21-2019, 09:43 AM
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Yeah sure why not, here some pics from today
This is now the best alfabb thread.

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post #64 of 126 (permalink) Old 02-21-2019, 09:45 AM Thread Starter
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Open pipe, then!


Hahaha
I was thinking maybe a larger diameter stinger or a smaller mid muffler. The car sounds nice it would just be even better if the engine thrashing wasn’t so loud (engine fan noise?)
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post #65 of 126 (permalink) Old 02-21-2019, 09:52 AM
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Nice! one of the many top drivers that got their career started in the SB series!
did you know that Hans Deen drove this car also? just once, when dady Huisman was angry on his son Patrick and he didnt let him race that weekend so Hans was there and raced this car, he told me that personally like he visits me every summer.
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post #66 of 126 (permalink) Old 02-21-2019, 11:29 AM
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Is this the kind of sound that you are searching for?

This is Shankle headers into a 2 1/4" pipe with a single Borla Straight through muffler. It is not too obnoxious under light throttle.
Compression ratio and exhaust valve timing affect exhaust note.
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Ed Prytherch
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85 GTV6 3L
76 Suzuki GT500
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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 #67 of 126 (permalink) Old 02-21-2019, 11:51 AM
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Nah,.. I think he was thinking something like this, my bud Francois Sicard warming up the 512

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The older I get.. the faster I was....
Tom
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post #68 of 126 (permalink) Old 02-21-2019, 10:39 PM
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For street hot rodding the best “bang for the buck” will be the set that most resemble the original Shankle headers. They had extra long runners on the 2-1 sections as to be able to tune for optimum ( if you had ability and time). It seems Vick Auto and Centerline are closest. Yes there is a co-relation of sound to performance. However obtaining that optimum within legal / social parameters may not be possible. If you don’t want to invest more time and money experimenting, find a complete system that the headers of your choice fit. Invest your money in shocks -tires sway bars brakes. Winning drag race at the stoplight nationals is not as rewarding as beating your opponent around the corners- through the twisties...

"Whenever I see an Alfa Romeo, I take off my hat". Henry Ford.
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post #69 of 126 (permalink) Old 02-22-2019, 05:51 AM
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[...]Winning drag race at the stoplight nationals is not as rewarding as beating your opponent around the corners- through the twisties...
Well...
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post #70 of 126 (permalink) Old 02-22-2019, 05:56 AM
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Ports 1&4 and 2&3 are always paired in 4-2-1 headers so that the pressure pulses in them are evenly spaced. That is for performance. Sound is a byproduct.
One of the top Alfa engine builders in the US has a set of modified IAP headers that he uses on motors on his engine dyno. He has shared data that shows how the HP peak varies with the length of tube from the collector to the open tail pipe. An engine can make upwards of 5 HP more tuning that length.
One of his customers paid Burns big bucks for a custom 4-1 system with an engineered collector and it made less power than his modified IAP headers. He was able to adjust some pipe lengths to get the Burns unit to equal his standard setup.
What primary tube size would be best for a strong street engine?

Mike
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1966 Super
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post #71 of 126 (permalink) Old 02-22-2019, 08:38 AM
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This is Shankle headers into a 2 1/4" pipe with a single Borla Straight through muffler. It is not too obnoxious under light throttle. Compression ratio and exhaust valve timing affect exhaust note.

Umm . . . Ed . . .? It's pretty obnoxious. But, then, my Super's AH exhaust isn't all that far behind. We're all doing the best we can so this is just a burden we'll have to bear.

Jim . . . '72 Super 1300, '70, 1750GTV, 2nd series,
'62, Lancia Flaminia Zagato3c, 2nd series

Last edited by 180OUT; 02-22-2019 at 08:43 AM.
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post #72 of 126 (permalink) Old 02-22-2019, 09:40 AM
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What primary tube size would be best for a strong street engine?
its all relative, it all depends on the intent of the motor you are building. first of all what type of header header config? in a nutshell 4-2-1 or tri-Y are better for street vehicles for low end torque but they do hamper high rpm running with the early merging of exhaust pulses. 4-1 are more race oriented for high rpm power and use.

old nords arent dynamos when it comes to revs unless its a purpose built 1300. i would reckon the 4-2-1 configs are better for the majority of builds on this board. pure non alfa race and crotch rockets motorcycles rev happy motors in search of top end power nearly always run 4-1
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post #73 of 126 (permalink) Old 02-22-2019, 09:58 AM
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The original GTA headers are interesting to me as it appears the primary pipes are not of equal length, and to my eye the shorter primaries seem to have a smaller diameter. I will try and post a few pics over the weekend to illustrate.

Cars ruined my life! 😱
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post #74 of 126 (permalink) Old 02-22-2019, 10:48 AM
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In his for sale post Terry Stahley reports that his 210 HP/8000 rpm motor makes 4 more HP with Spruell headers compared with 4-2-1. The 230 HP chart that Richard Jemison posted was with GTA-like 4-2-1 headers which have quite long primaries and short secondaries.

Ed Prytherch
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76 Suzuki GT500
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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 #75 of 126 (permalink) Old 02-22-2019, 01:32 PM
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GTA Headers imported from Italy back in the 70's. There is some debate as to whether or not equal length headers are better than those without.
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Jim . . . '72 Super 1300, '70, 1750GTV, 2nd series,
'62, Lancia Flaminia Zagato3c, 2nd series

Last edited by 180OUT; 02-22-2019 at 01:36 PM.
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