 1.8 vs 2.0 OE Exhaust differences? |
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| pete000 |
 Feb 17 2011, 05:35 PM
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#1
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Senior Member  Group: Members Posts: 1,886 Joined: 23-August 10 From: Bradenton Florida Member No.: 12,094 Region Association: South East States  |
I am curious of what is the difference between the 1.8 and the 2.0 exhaust systems in the 914. I know that the 1.8 has the curved up section at the back and the 2.0 is straight.
Is there any other significant differences? Size of tubing, bigger ports, better flow for a larger displacement, etc...? Do the 2.0 heat exchangers and muffler set up bot on to a 1.8 based engine? |
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Replies(1 - 7)
| Drums66 |
Feb 17 2011, 06:11 PM
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#2
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914 Rudiments Group: Members Posts: 5,321 Joined: 15-January 03 From: Coronado,Cali Member No.: 151 Region Association: Southwest Region |
.......Better exhaust flow with 2.0 (IMG:style_emoticons/default/idea.gif)
(IMG:style_emoticons/default/bye1.gif) |
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| Tom |
Feb 17 2011, 06:25 PM
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#3
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Advanced Member Group: Members Posts: 2,139 Joined: 21-August 05 From: Port Orchard, WA 98367 Member No.: 4,626 Region Association: None |
Short answer is that stainless steel ex's will flow better.
Long answer is you have too much restriction in both intake and exhaust. A 2.5 is going to be better with dual carbs and a good header. You need to visit: aircooled technologies forum. Jakes site, with lots of info on engine combinations. Tom |
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| Dave_Darling |
Feb 17 2011, 07:53 PM
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#4
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914 Idiot Group: Members Posts: 15,063 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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The 1.8 spans two different types of exhaust. The 2.0 does as well.
The 75-76 exhaust is the same for the 2.0 and the 1.8, and it is pretty lousy. The 74 1.8 used the same (more or less) exhaust as the 1.7 did, with the kick-up near the end. The 73-74 2.0 did not have the kick-up. The pipes are also slightly larger diameter than the 1.7 exhaust, and they are a different distance apart. (Important if you are trying to mix and match parts!) SSI made versions of both the 1.7 and the early 2.0 heat exchangers, but the 1.7 version seems to be less common these days. The diameter of those pipes was the same on both versions, and evidently slightly larger than that of the stock 2.0 pipes. --DD |
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| TargaToy |
Feb 17 2011, 09:09 PM
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#5
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-NONSOLIS RADIOS SEDIOUIS FULMINA MITTO- Group: Members Posts: 706 Joined: 26-March 10 From: DelMarVa Peninsula Member No.: 11,509 Region Association: MidAtlantic Region
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Sorry to hijak but how does one ID the stainless HE's by brand or size? My car was fitted with stainless pipes by the PO on the 1.7.
Dave, are you saying they might flow as well as 2.0 pipes? I ask because a 2056 build is in the future plans and not having to upgrade exhaust would be a real nice bonus. |
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| sean_v8_914 |
Feb 18 2011, 08:41 AM
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#6
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
1974 only 1.8 has bigger tubes than the early 1.7
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| Root_Werks |
Feb 18 2011, 10:41 AM
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#7
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Village Idiot Group: Members Posts: 8,511 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest
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QUOTE(TargaToy @ Feb 17 2011, 07:09 PM)  Sorry to hijak but how does one ID the stainless HE's by brand or size? My car was fitted with stainless pipes by the PO on the 1.7. Dave, are you saying they might flow as well as 2.0 pipes? I ask because a 2056 build is in the future plans and not having to upgrade exhaust would be a real nice bonus. It's been hashed out before, there are some good threads on this: Bottom line is the company that made SS HE's used the same pipe for 2.0 and 1.8-1.7 HE's. I'm running the 1.7-1.8 SS-HE's on my 2.0, others have measured the ID and OD of the SS-HE's pipes, they are the same which is slightly larger than stock 2.0 HE's and even larger than 1.7 HE's. So if you have 1.7 SS HE's, I wouldn't sell them. They'll function the same as the 2.0 SS-HE's. |
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| TargaToy |
Feb 18 2011, 10:36 PM
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#8
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-NONSOLIS RADIOS SEDIOUIS FULMINA MITTO- Group: Members Posts: 706 Joined: 26-March 10 From: DelMarVa Peninsula Member No.: 11,509 Region Association: MidAtlantic Region
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Thank you, thank you, thank you. This is very nice to find out. The PO did something I'm actually PLEASED about (IMG:style_emoticons/default/biggrin.gif)
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