Fuel injection and porsche heads

[ohiowesty]

I recently bought a '79 Westie. It has the correct block but with porsche heads and a single Weber carb. I would like to convert it back to fuel injection. My question is how would that work with the porsche heads, considering that the volume of the combustion chamber might be slightly different, the larger Porsche valves might create a different flow, and the spark plugs being placed at a different angle will detonate the mix a bit differently. All these factors will create a different dynamic from what the FI system was optimized for from the factory. Thanks in advance for your advice.

[old DKP driver]

Welcome

Are you saying that you have the 2.0 Porsche 3 bolt (intake manifold)
heads?

the valves are 42 int. 36 ext. on those heads
part # 039 101 371 A

Normally a 1979 bus will have square exhaust ports compared to oval ports
on earlier years from 1972.

You could always sell the 039 heads and go back to original 2.0 Bus heads
_________________
V.W.owner since 1967

[SlowLane]

Seeing as how you are starting with a Frankenmotor, you might want to convert to a Megasquirt system instead of going back to the factory L-Jet. Roughly the same amount of trouble scraping the parts together, but the Megasquirt would be much more tailorable to your engine's peculiarities.

This is assuming that your local smog laws would allow it, but as you already have that Weber thing on there, I gather that isn't a concern.

Just curious, though: what kind of heater boxes are you using? As pointed out, the original '79 heads had rectangle exhaust ports, so also would the heat exchangers.
_________________
Present:
'81 Westfalia: 2L, manual. Originally Canadian, now Californiated
Back in the day:
'72 Super Beetle
'69 Camper Van - Corvair powered
'71 Window Van - Transferred Corvair from '69

"With sufficient thrust, pigs fly just fine." - Internet RFC 1925

"They say a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance." - Sir Terry Pratchett

[Amskeptic]

[SlowLane]

[old DKP driver]

Sell the 2.0 Porsche heads and you will be ahead of the game money-wise
Then buy 2 NEW 2.0 Bus heads

It would be different if those heads were in a lighter car but, that's a decision for you.

IN A BUG, yes
in a 914 YES
IN a brick (bus)
_________________
V.W.owner since 1967

[ohiowesty]

[old DKP driver]

Don't forget that you also have to cut 4 new spark plug holes in the sheet
metal to match the new plug angle Since the bus holes are in an upright
configuration.

as far as which injection system is concerned it's a toss up depending on what you have for $$

D-JET was a good system and L-JET is also good and cheaper in the long run as long as parts are available.
_________________
V.W.owner since 1967

[old DKP driver]

Whoops !

Forgot your question on the intake manifold bolt holes. Yes you can
drill the holes for the center studs.
_________________
V.W.owner since 1967