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> Type 4 rebuild questions
mepstein
post Nov 19 2018, 08:14 PM
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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
post Nov 20 2018, 07:51 PM
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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
post Nov 20 2018, 08:06 PM
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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
post Nov 20 2018, 09:09 PM
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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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mepstein
post Nov 20 2018, 09:17 PM
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QUOTE(worn @ Nov 20 2018, 10:09 PM) *

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.

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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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
jcd914   Stock 1.7L at 8.2:1 compression ratio was 80HP (72...   Nov 20 2018, 07:51 PM
mepstein   Stock 1.7L at 8.2:1 compression ratio was 80HP (7...   Nov 20 2018, 08:06 PM
worn   Stock 1.7L at 8.2:1 compression ratio was 80HP (...   Nov 20 2018, 09:09 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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