914-6 Heat Exchanger Questions |
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914-6 Heat Exchanger Questions |
patssle |
Nov 15 2010, 12:40 PM
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#1
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Senior Member Group: Members Posts: 981 Joined: 28-August 09 From: Houston, TX Member No.: 10,741 Region Association: None |
Will a 1 5/8 exhaust work fine on a 3.0? I've read the 1 1/2 is better, but not as readily available.
I've been searching, and many threads are several years old. Is GHL no longer available? I read some negative things about B&B from a long time ago, are they better/improved now - or still crap? Basically looking for some updated opinions on heat exchangers for a 3.0L six. I found a used pair of 5/8 B&Bs...any reason not to go that route? Thanks. |
SLITS |
Nov 15 2010, 12:44 PM
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#2
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
The 1 5/8" you are talking about is O.D. I.D would be 1 1/2" assuming 1/16" metal thickness (never measured it).
Stock 914/6 exchangers are 1 1/2" O.D. and again, assuming 1/16" metal thickness would make them 1 3/8" I.D. |
IronHillRestorations |
Nov 15 2010, 01:11 PM
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#3
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I. I. R. C. Group: Members Posts: 6,717 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None |
Generally speaking for a street (flat 6) engine, a little small is better than a little too large.
The problem I've had with the B&B is fit and alignment. Sometimes they don't fit right, and sometimes the exhaust flanges don't align with the muffler. Ship them back and forth and it gets pricey, for something that's pricey to begin with. |
pete-stevers |
Nov 15 2010, 01:46 PM
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#4
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saved from fire! Group: Members Posts: 2,641 Joined: 10-October 04 From: Abbotsford,BC, Canada Member No.: 2,914 Region Association: Pacific Northwest |
I have heard it is much better to run stock(on up to a 3.2) than after market stainless if you really want heat, i think D Root will second this,
i think(..don't quote me) Chappy is running a pair of stock heat exchangers on his turbo 3.1 |
patssle |
Nov 15 2010, 03:38 PM
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#5
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Senior Member Group: Members Posts: 981 Joined: 28-August 09 From: Houston, TX Member No.: 10,741 Region Association: None |
Stock is insanely expensive though (found a pair asking for $4,000).
So going B&B can be a gamble? What about Hayward & Scott, any better luck there? |
mepstein |
Nov 15 2010, 04:55 PM
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#6
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914-6 GT in waiting Group: Members Posts: 19,269 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
I'm also thinking about the H & S heat exchangers. They will make custom sizes.
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914Sixer |
Nov 15 2010, 07:02 PM
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#7
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
Check with your Porsche dealer. Last ones I knew about were around $1600 each from Porsche.
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IronHillRestorations |
Nov 15 2010, 08:04 PM
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#8
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I. I. R. C. Group: Members Posts: 6,717 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None |
The Hayward & Scot h/e's LOOK good, but I don't like the idea of welds inside the heat collectors, and neither does Porsche. Some people died from CO poisoning on some early 911's due to faulty h/e design, that included welds inside the collectors.
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patssle |
Nov 15 2010, 08:06 PM
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#9
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Senior Member Group: Members Posts: 981 Joined: 28-August 09 From: Houston, TX Member No.: 10,741 Region Association: None |
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patssle |
Nov 15 2010, 08:09 PM
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#10
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Senior Member Group: Members Posts: 981 Joined: 28-August 09 From: Houston, TX Member No.: 10,741 Region Association: None |
The Hayward & Scot h/e's LOOK good, but I don't like the idea of welds inside the heat collectors, and neither does Porsche. Some people died from CO poisoning on some early 911's due to faulty h/e design, that included welds inside the collectors. I did read about this issue. People said they installed a monoxide detector just to be safe. |
914Sixer |
Nov 15 2010, 08:23 PM
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#11
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
There are two nice sets on Ebay right now.
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iamchappy |
Nov 15 2010, 08:37 PM
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#12
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It all happens so fast! Group: Members Posts: 4,893 Joined: 5-November 03 From: minnetonka, mn Member No.: 1,315 Region Association: Upper MidWest |
I have heard it is much better to run stock(on up to a 3.2) than after market stainless if you really want heat, i think D Root will second this, i think(..don't quote me) Chappy is running a pair of stock heat exchangers on his turbo 3.1 Not anymore, they were too restricting for the turbo, my bigger headers work much better. But I do know guys are running them on there 3.2's. |
Steve |
Nov 15 2010, 08:48 PM
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#13
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914 Guru Group: Members Posts: 5,584 Joined: 14-June 03 From: Orange County, CA Member No.: 822 Region Association: Southern California |
I'm running stock 914-6 heat exchangers on my 3.2 and it runs fine. My 3.2 has tons more power and torque than the previous 2.7 with 1 5/8" headers. It's too bad I didn't get to compare the headers with the heat exchangers for a comparison. I also got my heat exchangers for free, so I can't complain.
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Maltese Falcon |
Nov 15 2010, 08:51 PM
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#14
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Advanced Member Group: Members Posts: 4,641 Joined: 14-September 04 From: Mulholland SoCal Member No.: 2,755 Region Association: None |
I have a cust'r with a 3.2 ( motronic) and NO heater boxes. He has good heat/ defrost in the cabin. He utilized the fan blower atop the engine , which blows accross the barrels, and then ducts the flow into the J-tubes. The result is good cabin heat. The original purpose of the blower was to rid the engine of excess heat after shutdown. In reality, I've never seen anyone use it a a six conversion.
Marty |
pete-stevers |
Nov 15 2010, 09:02 PM
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#15
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saved from fire! Group: Members Posts: 2,641 Joined: 10-October 04 From: Abbotsford,BC, Canada Member No.: 2,914 Region Association: Pacific Northwest |
I have a cust'r with a 3.2 ( motronic) and NO heater boxes. He has good heat/ defrost in the cabin. He utilized the fan blower atop the engine , which blows accross the barrels, and then ducts the flow into the J-tubes. The result is good cabin heat. The original purpose of the blower was to rid the engine of excess heat after shutdown. In reality, I've never seen anyone use it a a six conversion. Marty ...... Marty you have been holding out on us.... Can you explain in detail, maybe photos too if you have em?? heat headers no spensive heater boxes??? thanks..eh? |
Maltese Falcon |
Nov 15 2010, 09:20 PM
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#16
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Advanced Member Group: Members Posts: 4,641 Joined: 14-September 04 From: Mulholland SoCal Member No.: 2,755 Region Association: None |
I have a cust'r with a 3.2 ( motronic) and NO heater boxes. He has good heat/ defrost in the cabin. He utilized the fan blower atop the engine , which blows accross the barrels, and then ducts the flow into the J-tubes. The result is good cabin heat. The original purpose of the blower was to rid the engine of excess heat after shutdown. In reality, I've never seen anyone use it a a six conversion. Marty ...... Marty you have been holding out on us.... Can you explain in detail, maybe photos too if you have em?? heat headers no spensive heater boxes??? it's just using the fan blower (on top/ left of the 3.2) , once you are below the front sheet metal (with some custom contours)...just split some ducting L and R to the oe 914 heat duct inlets. You will not need to use the stock 914 heater blower , but redirect the 12v power to the new 3.2 fan. Sorry for the grainy pic, this is the same system heating up my 3.2 syncro vanagon. Marty thanks..eh? |
JmuRiz |
Nov 17 2010, 10:44 AM
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#17
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914 Guru Group: Members Posts: 5,426 Joined: 30-December 02 From: NoVA Member No.: 50 Region Association: MidAtlantic Region |
Bummer there's no way to do that on an old 2.7 with carbs. Oh well, I guess seat-heaters or a cig-lighter powered heat blanket will be needed in the rare occasion I drive it in chilly weather.
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