1973 2.7L 911RS - Replica

stylomylo · 11-29-2007, 05:41 PM

Finally after 1 year of restoration, it's complete!

The original car was a 1974 911S EURO with 2.7L MFI with 911/83 915 transmission. Everything was stripped and all parts were either reconditioned or replaced. Body was bare metal finished but unfortunately, it could not be hot dipped galvanized because there isn't any galvinizing facility where I live. Engine is fully rebuilt with new components except for crankshaft and conrods. MFI was reconditioned at a reputable shop in the UK.

I'm not new to Porches (owned 993C4 previously and now a 997S), however, I'm new to early 911. I bought this car with the intention of rebuilding it after much research, but I've never driven an early 911 so didn't know what to expect. I have a few questions which perhaps some of you may be able to assist.

- engine smokes quite a bit when pushed (ie 4-6k RPM). is this normal?
- strong fuel smell when car (outside) is idling and some smoke
- 1st gear will crunch. must stick it into 2nd prior to 1st
- 3rd gear is very vague and hard to engage
- there is a strange vibration coming from transmission during lift off between 3-2k RPM

many thanks....

Joe Bob · Joe Bob's Garage

Cool....looks good. Humor me, could you take a close up pic of the Carrera RS on the duck tail?

There are many different styles for the "RS" and I'm curious as to which one that you used?

As to the smoking issue, it could be a few things. How full is the oil tank? How many miles have you put on it since you got on the road? Have you done any leak down or compression checks?

RSBob · RSBob's Garage

Sounds like time for a tranny rebuild. From your description you synchros are shot or weak. Nice looking beastie.

raj911 · raj911's Garage

Hi stylomylo, have see your car around the Holland area. Sweet looking. Would love to see it in the flesh

Who did the backdate for you?

Sorry I cannot help with the tech stuff, I am just no good at it.

RWebb · RWebb's Garage

what happens re oil smoke if you run it up to 5k and then back off?

Larry_Ratcliff · 11-29-2007, 09:19 PM

gorgeous car! Is the smoke oil smoke or running rich smoke? Based on your descriptions it sounds like your injection needs to be tuned (since you smell heavy gas at idle). this would be normal cold (sort of) but should go away when warmed up. However, it sounds like you are getting a very rich condition at all spectrums of the rpm range.

dd74 · 11-29-2007, 10:12 PM

Very nice car. Engine could be valve guides. Transmission probably should be rebuilt. Do it with short gears.

stylomylo · 11-29-2007, 10:25 PM

just to answer some of your questions:

- engine is fully rebuilt (ie new valves, valve guides, pistons etc)
- tranny has brand new synchros (but has short shift kit installed)
- larry, i think you're right, car is running very rich, no smoke after lifting off

one other question, these early 911s have a hand throttle, but it's seems to me they're absolutely ineffective (unless there's something wrong with mine)
hot or cold engine, i CANNOT get the car to idle at 750RPM. what's wrong? is there a black art to this?

Macroni · Macroni's Garage

Beautiful! Where did you get the seats?

911teo · 11-30-2007, 04:28 AM

Wonderful car. Where are you located?

911teo · 11-30-2007, 04:29 AM

Quote:

Originally Posted by Luke Marano Jr

Beautiful! Where did you get the seats?

try here

http://www.rs911.com/cat.php?sectionid=1&catid=2

javadog · 11-30-2007, 04:45 AM

engine smokes quite a bit when pushed (ie 4-6k RPM). is this normal?
- strong fuel smell when car (outside) is idling and some smoke

Neither is normal. Try to find someone who really knows the MFI system and have them go through the whole tuning process. Shortcuts here will only frustrate you.

- 1st gear will crunch. must stick it into 2nd prior to 1st
- 3rd gear is very vague and hard to engage
- there is a strange vibration coming from transmission during lift off between 3-2k RPM

I'm going to assume that your clutch cable is properly adjusted and the shift linkage is in good condition and is also properly adjusted. If you are not sure, start with these. I'm also going to assume from your description that only the synchro rings were replaced. If so, that may be a problem as the other parts in the synchronizer assembly will have some wear and the new parts won't work well with the old parts. Again, take it to a good technician and have him drive the car.

one other question, these early 911s have a hand throttle, but it's seems to me they're absolutely ineffective (unless there's something wrong with mine)
hot or cold engine, i CANNOT get the car to idle at 750RPM. what's wrong? is there a black art to this?

The hand throttle should work and the car's idle should be adjustable, although I don't know that I would adjust the idle to 750. Yes, tuning an MFI system is difficult and there are lot's of people that claim to be able to do so that I wouldn't let near one of my cars. I'm thinking that you need to find a new technician...

JR

dd74 · 11-30-2007, 10:56 AM

Quote:

Originally Posted by stylomylo

one other question, these early 911s have a hand throttle, but it's seems to me they're absolutely ineffective (unless there's something wrong with mine)
hot or cold engine, i CANNOT get the car to idle at 750RPM. what's wrong? is there a black art to this?

The hand throttle is just an extension of the accelerator pedal. Mine works at anything from just below 1,000 RPM to 4,000 RPM. In short, to get the RPM you want is a matter of trial and error as far as to how high you pull the throttle. I pull mine about a 1/3 of the way when starting, then ease it down as the engine rises in idle. I've never been able to set it for a particular RPM, but rather have to continually adjust it as the engine warms up.

equality72521 · 11-30-2007, 12:27 PM

You so need to host some hi-res pics, I need some new desktop wallpaper.

RWebb · RWebb's Garage

who rebuilt the trans.? do they know all the tricks? if correctly rebulit you should not get the synchronizer grunch noise - unless brand new or the clutch is not properly adjusted.

who rebuilt the motor? were the valve guides replaced? with what? are you sure they are properly seated?
if all that is for certain fine, then do Check/Measure/Adjust on the MFI and do NOT deviate at all from the details

jester911 · jester911's Garage

I didn't see it mentioned in there but since the engine rebuild what was the break in procedure?

Beautiful car.

stylomylo · 12-02-2007, 05:27 PM

thank you to all of you who replied & to answer all your questions:

1) break-in procedure - car only has 1400km so i'm still breaking it in. max 5K RPM, lots of long distances drives 50km+ each time with constant gear & RPM changes.
2) who rebuilt the engine/transmission - very reputable local mechanic who specializes with early 911s. all the items you mentioned are new, ie valve guides, synchro clutch, clutch cable & MFI properly adjusted, etc
3) hi-res pics - certainly, but uploading can be slow, therefore suggest you send me pm and i can email them to you
4) seats - purchased from http://www.classiccarseats.com/index.php
5) location - SINGAPORE
6) hand throttle (HT) - even after engine is properly warmed up, RPM is hard to adjust, for example, when RPM drops slowly, during idle, i will pull HT, then nothing happens, but when i gently blip the foot throttle (FT), RPM will rise immediately to 3500K RPM, so i gently drop the HT down, RPM drops, but will continue to drop slowly and doesn't stay constant. if i drop the HT too much, i have to feather the FT to keep RPM up, but if pull it just by just a few millimeters, nothing happens unless i blip the FT again. in other words, i have to constantly change the HT position during idle and feather the trottle to keep the RPM STEADY. is this how it's supposed to behave?

thanks once again fellow enthusiast!

Jeff Alton · 12-02-2007, 05:39 PM

The hand throttle is only there to keep the motor idling as it warms up. Once that happens, it should not be required at all.

Cheers

mmn710 · 12-04-2007, 06:31 PM

Car looks great!!! My dads shop actually has one them selves, The motor is original 2.7 RS motor. Thing runs great, I was looking at your seats which i really liked and thinking of getting a set too. We have a set of Sparco's in it but there way to uncomfortable. Good luck with it, hope you work those problems out.

ed mayo · 12-05-2007, 09:46 PM

Stylomoylo, the thermostat has been removed from the pump, that means there is no automatic change in mixture as the engine goes from cold to hot, kind of similar to a choke system on a carburetor. This was done on race cars that only saw track use, the pump would be adjusted properly for hot running only. It came off the trailer, got warmed up, and hit the track. For your street usage you MUST have the thermostat and its necessary hot air plumbing to make it work, and make the car driveable. In its current state it is unuseable as a street car.