Yes, you have a nice pair of manifolds.
DD
| Slant Six Forum https://www.slantsix.org/forum/ |
|
| /6 exhaust https://www.slantsix.org/forum/viewtopic.php?t=18839 |
Page 1 of 2 |
| Author: | FuryIII [ Wed Jul 26, 2006 9:02 pm ] |
| Post subject: | /6 exhaust |
hello. this is my first post. what are the advantages/disadvantages of headers/split manifold? id also like to get as much input as i can on loseing the heat exchange with headers. im not after a hot rod. im after the shock factor. |
|
| Author: | SlantSixDan [ Wed Jul 26, 2006 10:16 pm ] |
| Post subject: | |
In general: Headers = noise, leaks, rust, poor fit, heat-related running problems (not enough heat *and* too much heat in the engine bay). Split (DutraDual) exhaust manifolds: No leaks, good fit, no heat-related problems, novelty visual effect. |
|
| Author: | slantvaliant [ Thu Jul 27, 2006 6:32 am ] |
| Post subject: | |
Quote: im after the shock factor
One word: Zoomies!
|
|
| Author: | Sam Powell [ Thu Jul 27, 2006 7:08 pm ] |
| Post subject: | |
You can get the split manifolds from Doug Dutra, otherwise known as Doctor Dodge. They will require that you fabricate some custom pipes, but are worth the effort if for no other reason then you can tighten the manifold bolts up tighter without fear of expansion cracking the exhaust manifold. The factory system is so long that they must leave the entire intake/exhaust gang a little on the loose side(10 ft/lbs of torque), so that they can slide a little as they expand. Once they are expanded everything gets tight, but I always suspected vacuum leaks when a slant is cold make a cold start problem worse. Once you can really crank down on those manifld bolts, which you can do with the split manifolds since they are less than half as long, she drives better when cold. |
|
| Author: | rock [ Thu Jul 27, 2006 7:18 pm ] |
| Post subject: | Howdy, here is an offer |
Hello, Man, you got two really knowledgeable and helpful guys to answer right off Dand and Sam) and a third (me) who is learning at their knees! If you PM me with your regular email, I will send you a good pic of what a set of Dutras looks like on my newly finished slant with offenhauser 4bbl intake and edlebrock 500cfm carb. Chrome, stainless, new paint = shock for sure! rock '64d100 |
|
| Author: | steponmebbbboom [ Sat Jul 29, 2006 9:32 am ] |
| Post subject: | |
Quote: im after the shock factor
Paint the car pink.
|
|
| Author: | Doctor Dodge [ Sat Jul 29, 2006 10:24 am ] |
| Post subject: | |
Dutra Duals Info. |
|
| Author: | FuryIII [ Sun Jul 30, 2006 7:08 pm ] |
| Post subject: | |
thanks for all the info. I like the DD1 thats on it now. not high impact but "normal". i dont wanna shock them with how it looks on the outside. i wanna shock them with how it looks on the inside. |
|
| Author: | Flyntgr [ Sun Jul 30, 2006 7:22 pm ] |
| Post subject: | Dual Dutra Duals |
I had Doug Dutra have a pair ceramic chrome plated and they are SHARP AS A TACK! Then I used 2.25" dual exhausts, front to rear, with Turbo mufflers. They are a little loud for the timid, but music to my old 62 year old ears. The sound at full throttle is like nothing else I've heard, and believe me they sound tough. This is a little more expensive, especially with the chrome-like ceramic coating, but I only wanted to do this once, and to get it right the first time. It IS right. Best of luck to you on your exhausts. |
|
| Author: | Doctor Dodge [ Sun Jul 30, 2006 9:38 pm ] |
| Post subject: | |
Yes, you have a nice pair of manifolds. DD
|
|
| Author: | CStryker [ Sun Jul 30, 2006 9:46 pm ] |
| Post subject: | |
Quote: You can get the split manifolds from Doug Dutra, otherwise known as Doctor Dodge. They will require that you fabricate some custom pipes, but are worth the effort if for no other reason then you can tighten the manifold bolts up tighter without fear of expansion cracking the exhaust manifold. The factory system is so long that they must leave the entire intake/exhaust gang a little on the loose side(10 ft/lbs of torque), so that they can slide a little as they expand. Once they are expanded everything gets tight, but I always suspected vacuum leaks when a slant is cold make a cold start problem worse. Once you can really crank down on those manifld bolts, which you can do with the split manifolds since they are less than half as long, she drives better when cold.
Don't you still have to worry about the intake manifold cracking though, since it still spans the full length? If not, what do you consider "really crank down?"
|
|
| Author: | 64ragtop [ Fri Aug 04, 2006 5:43 pm ] |
| Post subject: | |
Quote: Quote: You can get the split manifolds... Once you can really crank down on those manifld bolts, which you can do with the split manifolds since they are less than half as long, she drives better when cold.
Don't you still have to worry about the intake manifold cracking though, since it still spans the full length? If not, what do you consider "really crank down?"but surely "a bunch" more than TEN!!! |
|
| Author: | SlantSixDan [ Fri Aug 04, 2006 7:10 pm ] |
| Post subject: | |
Quote: Don't you still have to worry about the intake manifold cracking though, since it still spans the full length?
The intake manifolds do not crack like the exhausts—ever. Sometimes an intake will develop cracks in the "floor" area below the carb due to the thermal cycling caused by the exhaust hot spot, but no, you do not need to worry about stress cracking due to the intake spanning the whole length of the engine.
|
|
| Author: | SlantSixDan [ Fri Aug 04, 2006 7:13 pm ] |
| Post subject: | |
Quote: I always suspected vacuum leaks when a slant is cold make a cold start problem worse.
Well, surely. Vacuum leaks on any engine will cause problems with starting, running and driveability. There are no such leaks when the slant-6 manifolds are in good shape and are installed per factory specifications, using a quality gasket.Quote: Once you can really crank down on those manifld bolts, which you can do with the split manifolds since they are less than half as long, she drives better when cold.
This advice is not at all sound. "really cranking down" on the manifold "bolts" (which don't exist; they're studs and nuts) is a collossally bad idea. Don't do it. Flat manifold and head surfaces - a quality gasket - and factory installation procedure and torque values. That's the recipe for a successful and leak-free manifold installation. If your car has cold starting/cold running problems, they are usually not because of insufficient manifold stud nut torque, but because of carburetor and/or choke issues. Find and fix the problem, don't hamfist the manifold stud nuts, because if you do, you will usually come to regret it one way or another.
|
|
| Author: | Bren67Cuda904 [ Fri Aug 04, 2006 7:26 pm ] |
| Post subject: | |
Impact wrench  not really 
|
|
| Page 1 of 2 | All times are UTC-08:00 |
| Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/ |
|