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I've ran without rear spring rubbers and all it does is make the noise of the springs moving on the seats a bit more audible in the car.
They do have some bump stops built in them which also help to locate the spring, but I had no issues with mine and I was on track with it.
No RR graphs mate as the engines not gone together yet. R3 maxi Pistons are 3 ring as well mate, so good for a certain amount of longevity, although as with every forged piston they won't like constant cold starts.
Cam wise I think only the 403's come close to the maxi cams as well. Not really...
I've got genuine R3 maxi pistons, rods and cams mate. I'll also be using a R3 maxi evo airbox.
Head is ported and polished along with port matched manifold, supertech valves (standard size), 197 crank dynamically balanced alongside a lightweight flywheel and pulleys (possibly getting a maxi evo...
R3 maxi evo inlet valve part number: 77 11 155 377. It's either a stronger valve, or its bigger.
Exhaust valve is: 77 11 155 375 so the same exhaust valve used throughout.
Maxi evo revs to 8400rpm and also has solid lifters along with steel rods and crank.
197/200 shares the same size valve as 172/182. The difference in the 2 being that the 197/200 has a better design combustion chamber and ports. The 172/182 head does suffer relatively badly from the valves being shrouded as well.
As a for instance regards the valve sizes, the R3 Maxi Evo engine...
Cup racers were 20mm wider track per wheel so you need 20mm to be safe mate.
There's a few on here that have run the vw box mate and there's custom flywheels available.
@Andyrg@ ClioTurbo has done this conversion and I believe can supply the parts you'd need.
What gearbox do you intend on running with?
The outer cv joints off a 1*2 will fit the ex cup racer hubs you have as well, so you may just need to get your original driveshafts lengthened or remade.
Standard jc5 will be chocolate in a rally car though if you intend on giving it some abuse...
You could enlarge the pockets on the oe Pistons to run 422's or 423's. Iirc you need to increase the pocket depth around 1.5-2mm.
But those profiles work better with higher comp ratios. You could always fit a set of 197 Pistons if you really wanted to do it on the cheap and not bother with...