 Type 4 rebuild questions |
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| mepstein |
 Nov 19 2018, 08:14 PM
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#1
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914-6 GT in waiting  Group: Members Posts: 19,272 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region 
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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. |
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| 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 |
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| mepstein |
Nov 20 2018, 08:06 PM
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#3
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914-6 GT in waiting Group: Members Posts: 19,272 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(jcd914 @ Nov 20 2018, 08:51 PM)  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. |
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| worn |
Nov 20 2018, 09:09 PM
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#4
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can't remember Group: Members Posts: 3,156 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest
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QUOTE(mepstein @ Nov 20 2018, 07:06 PM) QUOTE(jcd914 @ Nov 20 2018, 08:51 PM) 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. |
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Posts in this topic
mepstein Type 4 rebuild questions Nov 19 2018, 08:14 PM
Mark Henry Webcam #73
96mm KB's for 66mm crank and move u... Nov 19 2018, 08:58 PM
mepstein
Webcam #73
96mm KB's for 66mm crank and move ... Nov 19 2018, 09:39 PM Chris914n6 The big difference with Djets is ecu and injectors... Nov 20 2018, 01:20 AM BeatNavy Mark (E) I'm doing a similar build right now. ... Nov 20 2018, 06:05 AM Racer I know a bump to a 1911 was always popular for 1.7... Nov 20 2018, 07:05 AM saigon71 FAT 440 MP camshaft is great with D-jet.
I think ... Nov 20 2018, 07:08 AM Literati914 Posted in the classifieds?, you amateur :poke:
... Nov 20 2018, 09:35 AM mepstein
Posted in the classifieds?, you amateur :poke:
... Nov 20 2018, 01:01 PM 914Sixer Correct me if I am wrong, but the stock 1.7 made 8... Nov 20 2018, 09:42 AM Racer
Correct me if I am wrong, but the stock 1.7 made ... Nov 20 2018, 11:22 AM porschetub
Correct me if I am wrong, but the stock 1.7 made... Nov 21 2018, 02:03 AM GregAmy "Subscribing". My 2L street car is runni... Nov 20 2018, 10:07 AM yellowporky getting ready to build up my 73 1.7 next month.
T... Nov 20 2018, 10:26 AM Alapone Just curious, has anyone built a motor with a 66mm... Nov 20 2018, 11:09 AM Mark Henry
Mark (E) I'm doing a similar build right now.... Nov 20 2018, 05:16 PM 914Sixer My bad, I got on the wrong info line. 88 hp was f... Nov 20 2018, 01:13 PM Jamie
My bad, I got on the wrong info line. 88 hp was ... Nov 20 2018, 02:41 PM thelogo If your stick in with djet = stay bone stock
If y... Nov 20 2018, 02:40 PM mepstein I already have 94mm Mahle P&C's, 2.0 crank... Nov 20 2018, 02:50 PM rgalla9146
I already have 94mm Mahle P&C's, 2.0 cran... Nov 21 2018, 04:58 PM mepstein
I already have 94mm Mahle P&C's, 2.0 cra... Nov 21 2018, 05:15 PM rgalla9146
[quote name='rgalla9146' post='2667542' date='Nov... Nov 21 2018, 06:02 PM mepstein
[quote name='rgalla9146' post='2667542' date='No... Nov 21 2018, 06:16 PM worn
[quote name='rgalla9146' post='2667542' date='Nov... Nov 21 2018, 06:14 PM JOEPROPER I think you're right about looking at HP incre... Nov 20 2018, 04:24 PM TravisNeff The CA spec 73 1.7 was 72 HP, lower than the 1.8 b... Nov 20 2018, 05:03 PM 76-914 Leave it stock and keep the RPM's up. Those ar... Nov 20 2018, 05:06 PM mepstein
[quote name='mepstein' post='2667271' date='Nov 2... Nov 20 2018, 09:17 PM Valy The static CR doesn't say much without conside... Nov 21 2018, 01:14 AM JamesM I think you are starting in the wrong place. the g... Nov 21 2018, 03:18 AM mepstein
I think you are starting in the wrong place. the ... Nov 21 2018, 07:29 AM scott_in_nh
Ditch the d-jet and you could do something like t... Nov 21 2018, 11:21 AM Front yard mechanic You could always turbo Nov 21 2018, 08:28 AM ClayPerrine
You could always turbo
OK.. I have to say it..... Nov 21 2018, 01:13 PM worn
You could always turbo
OK.. I have to say it.... Nov 21 2018, 06:10 PM Dave_Darling
"You can't turbo a 914!!!... Nov 22 2018, 02:24 PM 914forme Source a 2.0L bus intake and that keeps the D-Jet ... Nov 21 2018, 04:31 PM cgnj Mark,
Here is the link regarding the plenums.2270 ... Nov 21 2018, 09:06 PM ottox914 See the various builds linked in my sig. Very hap... Nov 24 2018, 10:23 PM |
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