Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

2 Pages V < 1 2  
Reply to this topicStart new topic
> Putting FI back on a 2.0l
Tdskip
post Oct 10 2018, 03:11 PM
Post #21


Senior Member
***

Group: Members
Posts: 644
Joined: 1-December 17
From: soCal
Member No.: 21,666
Region Association: None



Thanks for all of the responses and considerations.

This 2.0l engine is out of the car currently.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jcd914
post Oct 11 2018, 12:35 AM
Post #22


Senior Member
***

Group: Members
Posts: 1,662
Joined: 7-February 08
From: Sacramento, CA
Member No.: 8,684
Region Association: Northern California



QUOTE(Tdskip @ Oct 10 2018, 06:17 AM) *


It was an FI engine that was rebuilt with FI on it before it was switched (based on what I was told).



How much do you trust what you were told?

If it was rebuild and running on the stock FI before the switch to carbs then it still has a FI cam.

Jim
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Tdskip
post Oct 11 2018, 06:24 AM
Post #23


Senior Member
***

Group: Members
Posts: 644
Joined: 1-December 17
From: soCal
Member No.: 21,666
Region Association: None



QUOTE(jcd914 @ Oct 11 2018, 01:35 AM) *


How much do you trust what you were told?

If it was rebuild and running on the stock FI before the switch to carbs then it still has a FI cam.

Jim


Hi Jim. Everything seems to check out from what I was told prior to purchase and then what I saw when I went in person to pick it up.

Worst case, I suppose, is that I would put the carbs back on it.

What happens when an FI system meets a carb cam? Earth spin backwards? Dog and Cats start sleeping together? Or just bad timing/fuel ratios?

Thanks!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jcd914
post Oct 11 2018, 05:01 PM
Post #24


Senior Member
***

Group: Members
Posts: 1,662
Joined: 7-February 08
From: Sacramento, CA
Member No.: 8,684
Region Association: Northern California



The cams with higher lift and longer duration and overlap create irregular intake vacuum.
The FI does not handle the vacuum pulses and irregular air flow very well.
A mild carb cam you may just get poor idle quality and poor low rpm drivability.
The more radical the cam the worse the FI handles it.

Personally I would probably take the chance since the process is reversible.
I might take the time to measure the cam lift, duration and timing.

Good luck
Jim
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914_teener
post Oct 12 2018, 02:19 PM
Post #25


Advanced Member
****

Group: Members
Posts: 3,617
Joined: 31-August 08
From: So. Cal
Member No.: 9,489
Region Association: Southern California



QUOTE(jcd914 @ Oct 11 2018, 04:01 PM) *

The cams with higher lift and longer duration and overlap create irregular intake vacuum.
The FI does not handle the vacuum pulses and irregular air flow very well.
A mild carb cam you may just get poor idle quality and poor low rpm drivability.
The more radical the cam the worse the FI handles it.

Personally I would probably take the chance since the process is reversible.
I might take the time to measure the cam lift, duration and timing.

Good luck
Jim



You can measure both duration and lift with the cam in the engine. It will take some measuring...effort....and math.

It can be done.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Tdskip
post Oct 12 2018, 03:31 PM
Post #26


Senior Member
***

Group: Members
Posts: 644
Joined: 1-December 17
From: soCal
Member No.: 21,666
Region Association: None



I feel another Tech Day topic in the making here...

Is there a how to guide I should be studying?

Thanks!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

2 Pages V < 1 2
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 17th October 2018 - 04:35 PM