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> At a crossroads with my conversion
Cfletch
post Oct 31 2024, 05:57 PM
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Need maybe a little outside perspective. I have a 1970 914 1.7 that has been sitting on jackstands for about 10 years at this stage and is in the middlish of a 6 conversion. I ended up getting a 2.7L out of a 74 911 a while back that was stock and had its CIS installed on it, but needed to be refreshed with new gaskets. There came a point in time where I thought I did not want the CIS because of complexity of the fuel system and sizing of the plenum where I said screw it I'll do carbs instead. I got a set of core italian webers and went to rebuild them only to find out they needed more parts than I had thought. Those are sitting on the work bench in need of the random parts to be back to complete. I never got around to getting intake manifolds because I ran into an issue with the weird 74 CIS port sizing. They are 32mm from my recollection with the cutout in them for the injector. Once I realized that I couldn't just slap a standard intake on it I kind of just stopped in my tracks and with other projects, college, and career stuff taking priority, the car just sat. I eventually talked to the old owner of PMO and he mentioned that I could get away with actually using the MFI manifolds with my webers to circumvent the issues of the intake ports on the heads since the gaskets also have that cutout for the injectors so that was always kind of the option and route I was going. Now back after 10 years, I really want to get the car back on the ground and to drive it. I have a ton of work still left in terms of oil system, axles, intake of course, and engine install and I guess I am here to see what others think as the best direction to take.

Would I be better/smarter to just go back to CIS and deal with the system that I don't really feel comfortable dealing with? Or stick to the webers and the mix and match of the MFI intake manifold?

Additionally I was having some issues back when I was more active on the project to get the engine installed into the car.... Its been on a jack for all this time just waiting to be installed and from my recollection the angle of the car and the angle of the engine were off giving me some issues getting everything lined up in a manor where it could actually be bolted together. I think I generally just need to get back into the project and make progress but am not sure where to spend my time and money on.

Any thoughts or ideas are welcome
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Cfletch
post Nov 1 2024, 03:33 PM
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To kind of address the general convo going on here.

I think I might end up just doing new MFI manifold to work with my funky port heads and get new carbs.

Body is good! Its a California car and the longs are solid and HH was gone through and fixed. I have the front 5 lug conversion figured out with new to me 911 stuff that I got from someone leaving their conversion project. I have a /6 tank and I think I just need the neck? I'll have to check. I got my oil cooler modified by Rich ages ago. I think the last thing I will eventually need to address is electrical for the new engine, gotta wire up my CDI box and also just the rear end stuff, I got some 5 lug conversion stuff for the rear as well, but its been so long I forgot exactly what I got. I know I need Axles. I think I have 911 hubs and axle stubs...? And I got a new to me Tailshift. Engine is currently mated with a resurfaced flywheel, pilot, throw out, PP and clutch.

The PMO pricing seems so insane to me in a way but I think I need to just bite the bullet. What is a solid reason as to why I shouldnt use my original Webers? I am only missing a few little pieces here and there, nothing unobtainable, just need to make a list and finish it.
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bossboy302
post Nov 1 2024, 04:02 PM
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Doing a 6 conversion replacing MFI with Webers (new).
MFI cylinder head injector plugs readily available from Sierra Madre. Can't say if same for CIS...
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Cfletch
post Nov 1 2024, 04:37 PM
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QUOTE(bossboy302 @ Nov 1 2024, 03:02 PM) *

Doing a 6 conversion replacing MFI with Webers (new).
MFI cylinder head injector plugs readily available from Sierra Madre. Can't say if same for CIS...


Got a part number for the MFI plugs?
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Posts in this topic
Cfletch   At a crossroads with my conversion   Oct 31 2024, 05:57 PM
Robarabian   I will PM you.. we should talk. I have a similar ...   Oct 31 2024, 07:39 PM
rick 918-S   At one time I had some adapters made that blocked ...   Oct 31 2024, 09:47 PM
mb911   Sell the used carbs, sell the cis system, click ea...   Nov 1 2024, 04:48 AM
930cabman   Sell the used carbs, sell the cis system, click e...   Nov 1 2024, 08:28 AM
mepstein   Sell the used carbs, sell the cis system, click e...   Nov 1 2024, 10:49 AM
930cabman   I recently finished mine, very similar conversion....   Nov 1 2024, 04:50 AM
Cairo94507   All of the above. I didn't see any mention of...   Nov 1 2024, 07:11 AM
Root_Werks   Lots of advice; boils down to your skill, patience...   Nov 1 2024, 10:55 AM
gereed75   Lots of good opinions here. I’ll add mine - sell...   Nov 1 2024, 02:46 PM
mepstein   Or buy a converted car and sell what you have. You...   Nov 1 2024, 02:51 PM
Cfletch   To kind of address the general convo going on here...   Nov 1 2024, 03:33 PM
bossboy302   Doing a 6 conversion replacing MFI with Webers (ne...   Nov 1 2024, 04:02 PM
Cfletch   Doing a 6 conversion replacing MFI with Webers (n...   Nov 1 2024, 04:37 PM
ClayPerrine   Doing a 6 conversion replacing MFI with Webers (n...   Nov 1 2024, 06:17 PM
gereed75   Not sure what an “MFI manifold” is. With MFI t...   Nov 2 2024, 08:37 AM
mb911   Not sure what an “MFI manifold” is. With MFI ...   Nov 2 2024, 10:58 AM
PanelBilly   Sell the engine and put in a 2.0 from a /4. Drive ...   Nov 2 2024, 03:41 PM
dtmehall   Sell the engine and put in a 2.0 from a /4. Drive...   Nov 2 2024, 08:04 PM
Cfletch   This is what I am referring to here: https://empiu...   Nov 2 2024, 07:50 PM
gereed75   That is a standard carb manifold. Yea would work o...   Nov 2 2024, 08:55 PM
colingreene   I will have a 2258 coming out of my car soon enoug...   Nov 3 2024, 11:41 PM


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