75 S to R Homage

[left4dead]

Car looks incredible, Andy.

The detail is superb.

I really hope to see this in the flesh someday.... Enjoy.

[haasad]

So I had a 3 hour rolling road session this morning with Pete and Tom at Sigma engineering in Gillingham who were recommended by Tim at Marque 21 and Terry at TT Racing. Scary seeing your car strapped down and driven.

Anyhow we dropped the air corrector jets one size and things improved mixture wise but there was still a misfire loaded only at 3800 rpm onwards.

We went back to the dizzy to look at phasing. What we discovered was that once the total advance was "in" the rotor tips were clear ie past the relevant dizzy pin by some margin. We did some measuring and re-positioned the rotor relative to the shaft to be sure that at idle the rotor tips were just starting to close in on the dizzy pins and as the full advance comes in they are still in good proximity.

Ran it up misfire nearly gone just a little high end (5900-6000) miss and pulling like a train below. We are sure the NGK6ES plugs which I've been running it on are a bit soft so will swap out to some harder hotter ones tommorrow. One other thing to do is make a little insulator for the modified jag rotor end since their is a lot of exposed conductor there which may be tracking under heavy load.

Pete went through the carb balance in detail and did some fine tuning.

We didn't do a full power run but we know we have a minimum of 180hp at the wheels. This dyno is known to be conservative in its figures and the best bit is how torquey it is pulling some real load easily.

I'll get some figures once its got a few more miles on it. The drive home was great and I realised that in reality I'm not confident nor able enough to drive it much above 5500rpm in third or fourth any way but what a noise with it on cam....

Did have a scare when we noticed a loose rocker shaft bolt.......:o but all fixed now.

[911hillclimber]

Interesting:
1
You have found a good Rolling road, so need more details!
2
That they got that far into the engine (rotor over-lap etc) is impressive to me. I think Neil Bainbridge has a machine that does all that 'off engine', but those lads seem to be keen.

Did they remove the rocker covers to check valve clearance before the runs? If not, how did you find the loose rocker bolt?

When I was at war with my missfire, I tried 3 types of plugs from 3 experts (PMO's remember) and it seems to like stock 3.2 injection plugs!
3
3rd gear in a good 911 is the best gear ever!

Finally:
PROGRESS!!

[haasad]

Well the rolling road is in Gillingham Dorset and the prop ' Pete Lander certainly knows his onions.

I knew the clearances were all bang on I only did them at the weekend.

We found the loose rocker shaft nut when using a magnetic tool to lift out a plug from No4 it kept catching something else loose
I must have forgotten to check it on assembly as the others were all tight.

The plugs we have are NGK B7ECS which are not a usual choice being a "shrouded" type plug but I've just fitted them and nailed it up the road, no discernible miss and far less popping and banging as it warms up, they were recommended by Pete as the racing plug at a sensible price they use them in all their hemi head two valve Jags so the installation mechanics are similiar and the heat range is correct. Time will tell but I'm certainly happy now.

Just need to fill her up with new Joe Gibbs HR1 and new gear oil later in the week....

[sladey]

I'll get some figures once its got a few more miles on it. The drive home was great and I realised that in reality I'm not confident nor able enough to drive it much above 5500rpm in third or fourth any way but what a noise with it on cam....

That's when the magic starts and they love being revved


Sent from my iPad using Tapatalk HD

[haasad]

[quote="sladey"][quote="haasad"]

I'll get some figures once its got a few more miles on it. The drive home was great and I realised that in reality I'm not confident nor able enough to drive it much above 5500rpm in third or fourth any way but what a noise with it on cam....
[/quote]

That's when the magic starts and they love being revved


Sent from my iPad using Tapatalk HD[/quote]

oh bloody hell what have I built !!!!!

[911hillclimber]

It's a Hot Rod!
Enjoy it, post pics and wait (longer) for the summer!
Graham.

[chris hak]

I'm sure Andy won't mind me posting this on here:-

http://youtu.be/9chFlJUzQy0

[Darren65]

Magic!

I bet your neighbours love those 6:00AM Sunday morning drives!

[haasad]

I had an opportunity to weigh the car on a calibrated bridge today...930 kg wet and full of fuel...So a conservative 190 BHP at the wheels makes me not far off 200hp per tonne...no wonder I'm a bit scared of it.

On another matter The box that Mike sorted for me doesnt wine anyway near as much as previously so thats good. The "gripper diff is very loud and clunky at slow speed manouvering in particular in fact inside the car it sounds positively alarming. Any experience here? ( I can live with it if its normal )

[911hillclimber]

FWIW:
My plated diffs in the front and back of my hot Impreza creeekeeed/crakkkked like mad at slow speed/parking.
Silent when in motion about 10 mph.

200 bhp/ton is a good place to be on the road.

[johnM]

My ZF was noisy until it bedded in. Very quite now.

Kind regards.

[haasad]

A little update. The car is going well now and really pulls hard . I've no bench mark but am pretty happy now I'm getting used to it. Still need to find someone to trim my recaro style shells the bare glass and basic bum pad is a bit hard ... While I had the gearbox out recently I took the opportunity to have a look at correcting what I thought was a crancshaft oil seal leak. I couldn't see any evidence of that seal leaking once the flywheel was off so looked harder. I'm convinced I could see oil weeping past the drilling plug in the crankshaft end so I reseated the plug with a flat punch crossed my fingers and reassebled it. So far its stayed bone dry with another 100 or so miles on the clock, fingers crossed that was the culprit.

And I still have a very nioisy / crunchy diff' but the guys at gripper have confirmed its normal so I guess we'll accept it as part of the whole experience. Apparently they now have clutch plates for the diffs that have grooves to improve oiling that are quieter so a job for a few years time. ( I hope)

[haasad]

Must post some pics, but having a great time with the car. I was proud to show it at Bealiue ( never could spell that!)with Canford Classics cars, had a great drive back in a pair with the blue ST, and more recently at Sherborne classics with Marque 21, We've been putting some miles in around Dorset with zero problems and its stayed oil tight . The 915 box is fine too although the shift doesn't like to be hurried. I've learnt to use the torque accelerating through corners to time exits for when the power starts to hit above 4750rpm. I don't think its fast in a modern sense but certainly decently quick and so involving. I've got a trimmer sorted for the seats in October so that detail will be done. He has some correctish Recaro badges too

Best thing is how well its been recieved folks really seem to love it which is both a real surprise and very flattering, best thing is letting liitle kids ( up to the age of at least 50 ) get in at shows and seeing the look on their faces when its revved on open pipes. In the real world running it silenced is fine and I think its torquier then too. I've blagged a pre 72 car park for GWR so hope to meet a few of you then also hoping to do CLM next year.

TTFN

[Lightweight_911]

Best thing is how well its been recieved folks really seem to love it which is both a real surprise and very flattering ...

I don't know why you should be surprised Andy - it's a fabulous-looking car !

... best thing is letting liitle kids ( up to the age of at least 50 ) get in at shows and seeing the look on their faces when its revved on open pipes..

- you can't beat the sound of a flat six on megaphones ! ...


I look forward to catching up with you & the car again in the near future.