Type 4 rebuild questions |
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Type 4 rebuild questions |
mepstein |
Nov 19 2018, 08:14 PM
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#1
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914-6 GT in waiting Group: Members Posts: 19,578 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
What can I do to rebuild my 1.7 for more HP and torque but keep the original d-jet.
piston and cylinders crank camshaft heads ? I know I can't change the cam too much but is there one that will do better and still work with d-jet. I know there is modern FI but I'm not interested. No carbs. I'm not looking for all out HP or dropping 10K on an engine kit. I just want a nice bump in power, if possible, while keeping a stock looking engine. |
jcd914 |
Nov 20 2018, 07:51 PM
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#2
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Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
Stock 1.7L at 8.2:1 compression ratio was 80HP (72 1.7 was 72HP)
Stock USA 2.0L at 7.6:1 compression ratio was 95HP Stock Euro 2.0L at 8.0:1 compression ratio was 100HP So stock 2.0 Euro spec is a 20% increase over a stock 1.7L 80HP engine. Get rods to go with your 2.0 crank and pistons. D-jet will have no problem with that size engine, many run D-jet on 2056 engines. 73 2.0L D-jet used the same ECU as 72-73 1.7 D-jet but has different injectors, head temp sensor and MPS. Jim |
mepstein |
Nov 20 2018, 08:06 PM
Post
#3
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914-6 GT in waiting Group: Members Posts: 19,578 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
Stock 1.7L at 8.2:1 compression ratio was 80HP (72 1.7 was 72HP) Stock USA 2.0L at 7.6:1 compression ratio was 95HP Stock Euro 2.0L at 8.0:1 compression ratio was 100HP So stock 2.0 Euro spec is a 20% increase over a stock 1.7L 80HP engine. Get rods to go with your 2.0 crank and pistons. D-jet will have no problem with that size engine, many run D-jet on 2056 engines. 73 2.0L D-jet used the same ECU as 72-73 1.7 D-jet but has different injectors, head temp sensor and MPS. Jim That's beginning to sound like a plan. I do have 2.0 rods. If i only use premium grade fuel, can I move the compression to ~ 9.0. |
worn |
Nov 20 2018, 09:09 PM
Post
#4
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can't remember Group: Members Posts: 3,323 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
Stock 1.7L at 8.2:1 compression ratio was 80HP (72 1.7 was 72HP) Stock USA 2.0L at 7.6:1 compression ratio was 95HP Stock Euro 2.0L at 8.0:1 compression ratio was 100HP So stock 2.0 Euro spec is a 20% increase over a stock 1.7L 80HP engine. Get rods to go with your 2.0 crank and pistons. D-jet will have no problem with that size engine, many run D-jet on 2056 engines. 73 2.0L D-jet used the same ECU as 72-73 1.7 D-jet but has different injectors, head temp sensor and MPS. Jim That's beginning to sound like a plan. I do have 2.0 rods. If i only use premium grade fuel, can I move the compression to ~ 9.0. No one told me no at the time, but said no after the fact when I had cooling issues. I expect your expertise would be greater than mine. Have to revisit my numbers, but I think I went 9:00 for the 2056 and have worried about head temps ever since. That led to rich A:F solutions. Would prefer stock. |
mepstein |
Nov 20 2018, 09:17 PM
Post
#5
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914-6 GT in waiting Group: Members Posts: 19,578 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
Stock 1.7L at 8.2:1 compression ratio was 80HP (72 1.7 was 72HP) Stock USA 2.0L at 7.6:1 compression ratio was 95HP Stock Euro 2.0L at 8.0:1 compression ratio was 100HP So stock 2.0 Euro spec is a 20% increase over a stock 1.7L 80HP engine. Get rods to go with your 2.0 crank and pistons. D-jet will have no problem with that size engine, many run D-jet on 2056 engines. 73 2.0L D-jet used the same ECU as 72-73 1.7 D-jet but has different injectors, head temp sensor and MPS. Jim That's beginning to sound like a plan. I do have 2.0 rods. If i only use premium grade fuel, can I move the compression to ~ 9.0. No one told me no at the time, but said no after the fact when I had cooling issues. I expect your expertise would be greater than mine. Have to revisit my numbers, but I think I went 9:00 for the 2056 and have worried about head temps ever since. That led to rich A:F solutions. Would prefer stock. Makes sense. 9.0 is still pretty tame on a 911 engine but I guess the 4's are more sensitive. I'll let someone more knowledgeable than me figure it out. |
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