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> Putting FI back on a 2.0l
Tdskip
post Oct 10 2018, 03:11 PM
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Thanks for all of the responses and considerations.

This 2.0l engine is out of the car currently.
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jcd914
post Oct 11 2018, 12:35 AM
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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
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Tdskip
post Oct 11 2018, 06:24 AM
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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!
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jcd914
post Oct 11 2018, 05:01 PM
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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
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914_teener
post Oct 12 2018, 02:19 PM
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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.
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Tdskip
post Oct 12 2018, 03:31 PM
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I feel another Tech Day topic in the making here...

Is there a how to guide I should be studying?

Thanks!
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Tdskip
post Dec 26 2018, 01:56 PM
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QUOTE(JeffBowlsby @ Oct 6 2018, 12:02 PM) *

It would be a rare person/circumstance to take off a perfectly functional FI system to change to carbs. You can be 99% sure one or more FI components are not working and will need replacement and its pretty easy to troubleshoot most of them.


Finally got around to doing some testing on this specific set up and sure enough Jeff, the MPS is bad.

I wonder if that was the only reason why it was pulled off?
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JeffBowlsby
post Dec 26 2018, 02:17 PM
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Certainly would be a problem. I have the 043 MPS rebuilt and ready to ship also, just like the 049's.
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Tdskip
post Dec 27 2018, 08:53 AM
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Hi Jeff!

The one I bought from you for the 1.7 arrived already and is going in today -thanks!

Still doing lake archeology on this one but I’ll ping as needed. Was a pleasure working with you, thanks!
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