PMO carbs on stock 964 3.6 engine

Looking for some advice on my car: as it is a '72 s with a nice story and a big part still original paint I don't want to touch the body at all. I have 8" and 9" Fuchs and via this forum found Harry in Germany (close by Belgium) who will make me a set of rsr Fuchs (9" to the front and 8" widened to 11") - meanwhile I have a set of braids with TB's. Suspension wise I am thinking about kw or ohlins coilovers, it has 930 brakes.
It was converted to coilovers some time ago but there seems to be a fitment issue on the front as coils touch the body so that negative camber is not possible.
I will try to get some pictures on here, maybe someone knows those coilovers, can't find a brand on them...
The dilemma is on the engine: I could go back to rsr spec 2.8 or 3.0 and 917 brakes etc, but I am afraid that the total cost will be to high to still drive and enjoy the car, and that it won't be very streetable (I will not track it - it will be a weekend hotrod). It came with a 964 3.6 - 0km when installed - but I don't like the modern look, when you open the hood and see the engine it is a let down to me. So I thought of keeping the engine stock, but with (46?) PMO carbs, a amber engine shroud etc to give it a real cool look. Are there members running this engine set-up? Hp lost with the carbs? Throttle response comparable with itb?
The itb route is to expensive for me on a not period correct engine... hope to have some feedback to finally decide which way to go...
Some pictures of the car: http://www.early911sregistry.org/for...=1#post1019948
Cheers, Nico

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Hi...the link to your car doesn't work. Hoping this replacement will suffice.

http://www.early911sregistry.org/for...=1#post1019948

“Original paint”...

good one.

Always liked the idea, but it's rare enough that you almost never hear it mentioned. When all is said and done, a modified fan design for a straight blade type, and removal of ac unit, if possible.

Yes it seems rare, found this engine on bring a trailer a while ago: https://bringatrailer.com/listing/3-...porsche-motor/
I really liked the idea, but then with a full stock 3.6. I only find info on itb conversions for the 964/993 engines, I know it is modern, hi-tech, better fuel consumption etc... but never found feedback on a carb conversion for street use.

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Originally Posted by nico55

I really liked the idea, but then with a full stock 3.6. I only find info on itb conversions for the 964/993 engines, I know it is modern, hi-tech, better fuel consumption etc... but never found feedback on a carb conversion for street use.

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One reason for this may have something to do with a 3.6 in confines and choice of 'supertuners', where the whole car is gone over, given a new brand, or signature, with very high costs associated. A carb'd version would defeat the whole purpose of rebadging, with an absence of bells and whistles, that hi-tech offers.

I still think you're onto something...which on it's own, is outstanding.

One of the main benefits of EFI is spark control.

Over 11:1 compression on 91 octane with this configuration sounds like a very bad idea. Especially given the completely incorrect dome shape of the piston for carbs.


Also having my doubts on those dyno numbers. :rolleyes:

I sure don't have the same knowledge or experience as people like Frank Beck above but I have seen a few people running them with carbs. They don't seem to have any problems. We've got some guys that drive up from Monterey Mexico to run with us in the annual Texas Hill Country Rallye. They make the drive up and back as well as flogging them pretty hard through our winding roads.

I remember reading something about the larger displacement engines being able to run higher compression ratios on pump gas than the earlier small displacement engines.

Found a car with this set-up: http://dempseymotorsports.com/porsche-911-rsr/
In Belgium we have 98 octane pump gas, so should be ok?
To be honest I have no technical knowledge myself, I am just looking for a "budget friendly" hotrod engine, all the tech work is done by my brother but he wasn't very enthousiastic about the carb route :) so double checking on the forum, but if I understand it good the owner of the green rsr liked this 3.6 pmo setup very much?

I suspect you will be better off with the EFI unless you rebuild the engine to better suit carbs. Different pistons and cams would be needed to work well with carbs, I suspect.

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Originally Posted by nico55

To be honest I have no technical knowledge myself, I am just looking for a "budget friendly" hotrod engine, all the tech work is done by my brother but he wasn't very enthousiastic about the carb route :) so double checking on the forum, but if I understand it good the owner of the green rsr liked this 3.6 pmo setup very much?

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Though you may not be versed with engines, you will probably gain foundational knowledge of detonation if you absorb some basics now. Reducing compression a nominal amount to 10: 1 would probably be wise, regardless of octane. Some insight here :

https://jalopyjournal.com/forum/thre...mp-gas.291798/

I can see your thirst for carbs, but at what cost (money, time, experimenting, etc. not to mention anquish, worry and frustration). With a car like yours just go stock 3.6 and call it a day. I'd backdate the heat, put SSI's on the car and rock and roll. Next, rebuild your gearbox with shorter gear ratios :) and a guard lsd, lots of upgraded internals, maybe a collant pump if you plan to track it, and go live the dream. Ask yourself, do you take the blue pill and all goes back to normal and you don't own a Porsche. Take the red pill and I'll guide you down the rabbit hole to the slipper slope of Porschephilia, recently certified in the Physician's Desk Reference manuall as an addendum to describe men of our ilk :)

Hahaha, Ill take two red ones :)
You are right, I thought it was just buying the pmo kit, plug and play... I will just leave it like that. Today the rsr finish braids came in with TB's and next week the car will be picked up by Leo - Madeno Racing (ohlins center), his work is fantastic, can't wait to finally drive the car.
About that 964 engine: it was installed in 1990, so I think it is the first 3.6 conversion ever?

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Originally Posted by JackMan

I can see your thirst for carbs, but at what cost (money, time, experimenting, etc. not to mention anquish, worry and frustration). With a car like yours just go stock 3.6 and call it a day. I'd backdate the heat, put SSI's on the car and rock and roll. Next, rebuild your gearbox with shorter gear ratios :) and a guard lsd, lots of upgraded internals, maybe a collant pump if you plan to track it, and go live the dream. Ask yourself, do you take the blue pill and all goes back to normal and you don't own a Porsche. Take the red pill and I'll guide you down the rabbit hole to the slipper slope of Porschephilia, recently certified in the Physician's Desk Reference manuall as an addendum to describe men of our ilk :)

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Here some more pictures (paint on roof, bonnet, bumpers, under- and inside seems original)?Attachment 498624

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Today we fitted the braids, next week suspension and geometry Attachment 498693

Very very cool car, love the color and the Braids. Now get out there and drive it, get it dirty! Don't worry about making the front bonnet perfect. Don't paint it. Love the patina of the chips on the leading edge of the front bonnet/bumper. If you are afraid of rust or can't stand the look of patina, hire a pro to respray. Your front bonnet and bumper are way past the touch up paint stage.

Thanks! It is even better in person :) I will wait as long as possible to paint it as things are only once original.
About 15 years ago I had a 911t with a 3.2, it was completely matte, I will try to find some pictures of that one.
I remember selling it: impossible! Nobody liked it, and it was for sale for 6 months for a bargain price. Instagram changed some things....

Quote:

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Originally Posted by JackMan

Very very cool car, love the color and the Braids. Now get out there and drive it, get it dirty! Don't worry about making the front bonnet perfect. Don't paint it. Love the patina of the chips on the leading edge of the front bonnet/bumper. If you are afraid of rust or can't stand the look of patina, hire a pro to respray. Your front bonnet and bumper are way past the touch up paint stage.

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Off to Ohlins Center for a full custom TTX setup, can't wait Attachment 501627

Hi, I found an article in excellence magazine about a green rsr, Eade Hopkinson was the owner, seems he had done just a pmo 46mm carb conversion and a hpx ignition system. Anyone knows this car?