1.7 single carb or 1.8 fi motor, what should I do? |
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1.7 single carb or 1.8 fi motor, what should I do? |
jimkelly |
Jun 22 2005, 06:45 AM
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#1
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Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
My car has a 1.7 single carb but I have access to a 1.8 fi motor. Should I do a swap when the motor and tranny are out for a clutch replacement??
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ClayPerrine |
Jun 22 2005, 06:50 AM
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#2
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Life's been good to me so far..... Group: Admin Posts: 15,423 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
Jim,
The FI will run better and get better mileage than the single weber carb. It will also make the engine last longer. To get a air cooled 914 to run with that carb, you have to run it really rich because the fuel drops out of atomization at the manifold below the carb. I would put the injection back on. Easy starting, and smoother running. But remember, I dislike carbs, so my opinion is biased. |
jimkelly |
Jun 22 2005, 07:25 AM
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#3
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Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
Thanks - who is not biased (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)
I've read that FI is much better than carbs for these engines. I suppose a 1.8 with 50k on it should be better than a 1.7 with unknown mileage as well too? Jim |
tat2dphreak |
Jun 22 2005, 07:44 AM
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#4
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stoya, stoya, stoya Group: Benefactors Posts: 8,797 Joined: 6-June 03 From: Wylie, TX Member No.: 792 Region Association: Southwest Region |
if you are REAL energetic, you can take the FI off the 1.8 and use it on the 1.7... don't use a single carb though, 2 carbs or FI, whichever you feel like you can dial in more correctly is the right choice for you... |
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ClayPerrine |
Jun 22 2005, 08:05 AM
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#5
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Life's been good to me so far..... Group: Admin Posts: 15,423 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
If you raise the compression, the 1.8 engine is better than the 1.7. The 1.8 uses bigger valves. The problem with it is that the manufacture dropped the compression ratio to lower emissions, so we get a lower HP output. With the tweaking that I did on Betty's car, we get about 90 HP out of a 1.8 with the injection. But it doesn't have the torque of the 2.0. Wish I could talk her into a built 2.0 for her car. (IMG:http://www.914world.com/bbs2/html/emoticons/screwy.gif) |
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root |
Jun 22 2005, 09:18 AM
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#6
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Two Wheeled Type4 Completed! Group: Members Posts: 849 Joined: 5-May 04 From: Sterling, VA Member No.: 2,026 Region Association: None |
Jim,
Just thinking out loud here..... This engine comes with fuel injection,right? Does that include all the goodies? MPS-manifold pressure sensor, brain, wiring harness.... Don't forget you'll need a fuel pump too. (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif) The one you have for your carb won't cut it. You need ~32 psi constant for the F.I. Maybe ask Boboli914 for a list of what it comes with so you can plan ahead. (IMG:http://www.914world.com/bbs2/html/emoticons/chatsmiley.gif) |
jimkelly |
Jun 22 2005, 09:37 AM
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#7
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Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
Root,
I've contacted him - I'll keep you posted. That orange car in CA with the fuchs is still avail. I emailed the owner of it too as I will not be satisfied until my car has fuchs on it. Also there is a guy parting out several cars in the dc area - I emailed him for parking brake handle and cable. It will be real nice when we have a complete list of what is needed . Thanks, Jim |
tat2dphreak |
Jun 22 2005, 09:42 AM
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#8
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stoya, stoya, stoya Group: Benefactors Posts: 8,797 Joined: 6-June 03 From: Wylie, TX Member No.: 792 Region Association: Southwest Region |
not only the fuel pump, but wouldn't you have to change the FI harness and the relay board? since the 1.8 was Ljet? unless the car was originally an Ljet car that is...
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SLITS |
Jun 22 2005, 09:51 AM
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#9
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
1.8 was L-Jet....no pressure sensor...metered by a vane airflow unit...you would need EVERYTHING to make it work (or spend a bunch of money acquiring the missing parts).
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Dave_Darling |
Jun 22 2005, 09:53 AM
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#10
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914 Idiot Group: Members Posts: 14,981 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
The relay board is the same for L-jet cars as it was for D-jet cars. One single part number is listed for all four-cylinder 914 applications.
--DD |
jimkelly |
Jun 22 2005, 10:12 AM
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#11
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Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
I'm starting to see why people with limited mechanical abilities switched over to carb/s from FI. I guess a comprerssion test on my engine and the 1.8 would yield some valueable info. Maybe the 1.8 carbed might be an option as - for one reason - it has only been sitting for one year and my 1.7 has been sitting for about two. Jim
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tat2dphreak |
Jun 22 2005, 10:21 AM
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#12
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stoya, stoya, stoya Group: Benefactors Posts: 8,797 Joined: 6-June 03 From: Wylie, TX Member No.: 792 Region Association: Southwest Region |
single carb should not be an option... sorry, they are terrible... and will not give you enough fuel, you'll run lean all the time |
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root |
Jun 22 2005, 11:37 AM
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#13
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Two Wheeled Type4 Completed! Group: Members Posts: 849 Joined: 5-May 04 From: Sterling, VA Member No.: 2,026 Region Association: None |
Yesterday I looked at Jim's car. I got to tell you that's the first time I've
seen a teener with a single carb. Reminded me of the old old days pre-typeIV. When the bugs had single carbs. Jim and I were so busy looking at everthing else we didn't spend time checking the carb out. Don't even know what size it is yet, but it did look old-old skool cool and simple in there with the chrome air filter and chrome intake tubes ooh yah!. I suppose if you tuned the thing well and you drove really conservative (like granny-style) you'd end up getting pretty good gas mileage. I'm thinking that people with 4 cylinders and one well tuned carb should get some kind of Federal Gas Rebate... (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif) |
type47 |
Jun 22 2005, 07:48 PM
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#14
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
many fuel injection parts for L-jet are still available at a reasonable price, unlike D-jet. i vote for 1.8 L-jet (but i'm partial, i have one w/L-jet). if you are thinking of going that route, consider the porsche parade swap meet this sat, 6/25.
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