MFI pump 2.0S
 

hello everybody ,

Is a 2.0S MFI stock pump run without any problem with a 2.2S upgrade ? (JE piston 84mm ) ?
the guys from Koller told me the upgrade of a 2.0S to a 2.2s spec is very expensive and it is better to make a standard exchange .
Therefore I would prefer to keep my 2.0s pump unless......


thanks for your expert answer.

jd

Koller & Schwemmer will tell you "the smaller pump cannot be adjusted to meet the fuel requirements of the larger engine"

This is not true, given that the camshaft profiles are identical and the 2,0 runs rich anyway, I think it's no problem to use the 2,0S pump.

See here:

http://forums.pelicanparts.com/porsche-911-technical-forum/386414-mfi-pump-open-heart-surgery.html

Do NOT let them trade your 2,0S pump for a 2,2. The 2,0 is the best pump for converting to an RSR. . . is worth more than a 2,2.

Good luck!

Tanks a lot ;)

they require 2270 € for the overhaul of the pump
and 2990 euros for the exchange of 2.2 s !!!

do you mean i will not require only minor adjustment to make it work ?

Your 2.0 pump can easily be tuned to give enough fuel for the 2.2

You may have a lower rpm spot or two that has a sub-optimal air/fuel ratio, but it should be minor. This is due to slightly different space cams.

Your 2.0 pump will work fine for all the important (higher) rev ranges where you are on the power.

it sounds great. :D
;)

I have also seen on supertec website very nice polymid tubes between MFI and injector. Is there any recommendation ? Can i use it for street use ? Do i need adaptors because i do not see how they are sealed to the injection parts ?


best regards

Metal lines are fine. Why do you want the plastic ones? I do not know if they are any better. I like the security (rigidity) of the hard lines.

In fact on my engine when i bought the car , everything was original except the injection which was replaced by carburettors
I wanted to restore it but the rigid line i own are not in good condition and need to be treated again.
therefore i'm wondering if plastic line are not a good alternative and i must say the racing look is not so bad.

jd

I do not think there is anything bad about the plastic, as long as they are routed well so that they do not rub on anything. The metal lines were made the same lengths for fluid dynamics reasons, if I remember correctly. Just make sure you replicate that.

Since Porsche used them on racecars, they must be good, I am just not sure why they switched.

maybe someone from supertec (henry ? ) can answer ?

I encountered a problem with the Parker Parflex poly fuel line (3/16 OD, .046 wall, 500 psi working pressure, semi clear line) last year while testing an MFI pump with the customers injectors. One of the injectors was totality plunged and that fuel line burst during the test. I switched to the "FreelinWade" semi clear nylon with a 900 psi working pressure and ran the same test with the plunged injector and the pump sounded like it had a rod knocking but the line did not fail. So plastic, nylon lines could have a safety issue compared to the steel lines IMHO.

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