Driving IMIA's extraordinary air-cooled 911s
Discussion
Slippydiff said:
The OE Speedlines were NLA for a while , available again now though. Unfortunately they weigh a ton, have weird offsets and corrode. At 5750 euros they’re a non starter unless you really have to have OE.
Tramonts or BBS every time for me (or Cargraphics) ...
That car is sitting very well Slippy. What was the set up?Tramonts or BBS every time for me (or Cargraphics) ...
Slippydiff said:
IMI A said:
on 911uk but it was basically someone asking how much to get to the 993 RS "look" and I forgot about the wheels in that figure ! The #10995 includes Speedlines!!! Dementia setting in very early 
Tramonts or BBS every time for me (or Cargraphics) ...
Steve Rance said:
That car is sitting very well Slippy. What was the set up?
Evening Steve, it’s actually a US car, it’s a rep based on a C4 with sunroof ...Looks good though !! Iit’s On JRZ's.
It’s a Rennlister’s car :
https://rennlist.com/forums/993-forum/943805-my-99...
And I remember now that the wheels weren’t Cargraphic, they were Brombacher Works, subsequently changed to Tramont RS reps.
I know this car well. Tony built it with Paul. What you have is a nut and bolt recreation of a RS CS. I believe that Tony worked for Porsche Reading back in the day and was sent to Germany to be trained on working on 964/993 RS’s. His knowledge of these cars is pretty much second to none. Your build will probably be so accurate that an expert couldn’t tell one apart from a genuine car without a chassis number. If I were you I’d do a little research on it and create a build file. You have something very special there.
Here's a vid of whats involved to build one properly. One can of course get the 993 RS look for £11k + paint with the door cards, body kit and original Speedlines which seems popular on a 993 but to build one like Jackals old car or the 9m CS cars in the vid involves a lot of marque expertise and know how.
Excuse the music!
https://www.youtube.com/watch?v=r5adY38sUtM
Car seems to go very well.
https://www.youtube.com/watch?v=5XsVsjF-_gU
https://www.youtube.com/watch?v=U1pO_1Bj_N8
Excuse the music!
https://www.youtube.com/watch?v=r5adY38sUtM
Car seems to go very well.
https://www.youtube.com/watch?v=5XsVsjF-_gU
https://www.youtube.com/watch?v=U1pO_1Bj_N8
IMI A said:
Here's a vid of whats involved to build one properly. One can of course get the 993 RS look for £11k + paint with the door cards, body kit and original Speedlines which seems popular on a 993 but to build one like Jackals old car or the 9m CS cars in the vid involves a lot of marque expertise and know how.
Excuse the music!
https://www.youtube.com/watch?v=r5adY38sUtM
Car seems to go very well.
https://www.youtube.com/watch?v=5XsVsjF-_gU
https://www.youtube.com/watch?v=U1pO_1Bj_N8
I like the music Excuse the music!
https://www.youtube.com/watch?v=r5adY38sUtM
Car seems to go very well.
https://www.youtube.com/watch?v=5XsVsjF-_gU
https://www.youtube.com/watch?v=U1pO_1Bj_N8
Far better than the din the Yanks normally use to accompany their videos (I’m definitely getting old) 
I remember the build, it’s documented on RL. Very nicely done, and using almost the perfect donor car.
A shame about the wheels, I know they’re forged, light, strong, a well regarded manufacturer and excellent quality, but they really don’t suit an air cooled 911. BBS or Tramont reps every time.
9M went through a long phase of running the front ride heights of air cooled RS models higher than the rear, not only does it look strange, it means the front to rear rake is incorrect (as in non-existent) They set a 964 RS of mine up that way, and I disliked the way it drove (and looked).
ras62 said:
IMIA does the engine in your car have hydraulic tappets or are they manually adjusted? IIRC from 9M posts on Rennlist the power claims were a lot higher than 330 bhp with all the parts you mentioned?
I'll check for you Ras as I'm not near the paperwork but I'm guessing they're the regular hydraulic tappets as YP built for max torque not max bhp. The old owner knew what he wanted having built air cooled previously and he's building another one with a back date as we speak. Speaking to him about the new build and he's going to maybe go 3.8 for max torque again rather than the high revving track based cars like the ones below. He's also going to go for a boat tailed crankcase on the new one whatever in the world that is? YP doesnt have boat tails thats about as far as my engineering savvy goes!The engines in the 9m 93RS CS and 9M 93 RSR are more track spec I expect as the blue car is at 350bhp and the black one in pic below 430bhp is the power claim.
I'm going to do my best at some stage to get the YP down to Litchfield Motorsport and get her on their maha dyno. Watching the 9m RSR on track she's defo quick keeping a 480bhp 430 honest so I'd guess has similar power to weight of circa 340bhp per ton. Can't believe owner selling her TBH looks amazing.
https://www.youtube.com/watch?v=lI1PjgCV_c4
https://www.pistonheads.com/classifieds/used-cars/...
“Boatailing” is a machining/grinding process carried out to the internals of the crankcase, specifically the webs. It can seen in this image in the area adjacent to the oil sqirter jets which I’ve highlighted in red. The process forms a blunt knife edge or a “boat tail” that presents to the air circulating around the crankcase when the piston descends down the cylinder bore.
It’s alleged to reduce pumping losses within the crankcase at high revs. I’d take any claims of increased horsepower gains with a massive pinch of salt.
In an F1 engine or bike engine there may be a benefit, but in a slow revving (by modern day standards) I’m less than convinced by its benefits.
It’s alleged to reduce pumping losses within the crankcase at high revs. I’d take any claims of increased horsepower gains with a massive pinch of salt.
In an F1 engine or bike engine there may be a benefit, but in a slow revving (by modern day standards) I’m less than convinced by its benefits.
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