 FI Manifold Flow Rates, Which set of manifolds is best for a 2056, 1.7L or 1.8L? |
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| ptravnic |
 Oct 10 2006, 11:25 AM
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#1
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Senior Member  Group: Members Posts: 1,231 Joined: 27-May 03 From: Chicago, IL Member No.: 747 Region Association: None 
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Title says it all. My 2056 was built using 1.8L heads (4 bolt pattern) so I can either use the 1.7L or 1.8L manifolds. Which will provide better flow? Any data to back it up?
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| Jake Raby |
Oct 10 2006, 11:30 AM
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#2
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
What plenum do you have??
The 1.7 runners are the smallest diameter, they build torque but hurt RPM.. |
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| Brando |
Oct 10 2006, 12:37 PM
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#3
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BUY MY SPARE KIDNEY!!! Group: Members Posts: 3,935 Joined: 29-August 04 From: Santa Ana, CA Member No.: 2,648 Region Association: Southern California |
I believe the 1.8 runners are the same diameter as the 2.0 runners. That would allow you to use a 2.0 intake as well.
Are you using D-Jet or L-Jet? |
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| ptravnic |
Oct 10 2006, 12:58 PM
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#4
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Senior Member Group: Members Posts: 1,231 Joined: 27-May 03 From: Chicago, IL Member No.: 747 Region Association: None
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QUOTE(Jake Raby @ Oct 10 2006, 01:30 PM)  What plenum do you have?? The 1.7 runners are the smallest diameter, they build torque but hurt RPM.. All built off a once stock 1.7L D-jet. So, I'm using a 1.7L plenum but I'm willing to switch to the 2.0L if a benefit is to be had by doing so. I'm getting a 2.0L throttle body, and 2.0L injectors to go along w/the setup. My MPS was adjusted by Geoff (Bleyseng) based on his 2056 setup. I'll fine tune it w/a a/f meter and dyno once the parts are all in order. -pt |
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| Jake Raby |
Oct 10 2006, 02:12 PM
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#5
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Nope, 2.0 runners are larger diameter and shorter than all the rest..
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| ptravnic |
Oct 10 2006, 02:32 PM
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#6
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Senior Member Group: Members Posts: 1,231 Joined: 27-May 03 From: Chicago, IL Member No.: 747 Region Association: None
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Conclusions:
1.7L manifolds have a smaller diameter, will produce more torque, less power response @ higher RPM's 1.8L manifolds have a larger diameter, wil produce less torque, more power responsee @ higher RPM's Cool. I'm going to try out the 1.8L manifolds b/c the webcam 73 performs best from about 3 to 4.5k rpm's. My fun driving is done at these levels on windy roads. I'll keep the 1.7L plenum b/c it sounds like the 2.0L plenum will not line up w/the other manifolds. Thanks for all the help. -pt |
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| Joe Ricard |
Oct 10 2006, 06:01 PM
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#7
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CUMONIWANNARACEU Group: Members Posts: 6,811 Joined: 5-January 03 From: Gautier, MS Member No.: 92 |
Curious as to what kind HP/Tq. numbers that motor will make.
Compression ratio? vs. Cam profile? Bet ya don't make much more than a well tuned 2.0L See Jake I've been listening. |
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| ptravnic |
Oct 10 2006, 07:20 PM
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#8
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Senior Member Group: Members Posts: 1,231 Joined: 27-May 03 From: Chicago, IL Member No.: 747 Region Association: None
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CR is ~ 8.6:1. Webcam 73 grind w/matching lifters. Was hoping for 115ish hp.
-pt |
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