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Ben Lipman Goo Roo SA Soarer TT manual, plus TT track car, plus a spare shell
Posts: 4066 Reg: 04-2006
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Sunday, November 05, 2017 - 09:23 am, by: Ben Lipman(Ben12a)
Been a while since last update: Engine number three has been leaking combustion pressure from number two cylinder into the cooling system. Instant over pressure and over heating.
Engine number four is in the car, engine number three is in bits, and engine number two is gathering parts for a rebuild. Oh, and I fabricated a rear boot lid extension not too far from the factory lip, but more aggressive. Caught up? Good.
Last Monday I had the car out at Mallala with the SA Supra track day. With low track density, only five cars in my group, and 15 minute sessions I was really hoping to test out the new engine and lower the bench mark. Unfortunately, it rained. Again. I am beginning to think I am cursed.
For those following my progress on facebook, you would know I was unable to get hold of the Project Mu Club Racer pads in time. (They still haven’t arrived – never using that online seller again!) I also had another replacement 1J in the car after discovering my overheating issues were likely related to combustion pressure leaking into the cooling system. The first session in the rain was basically a shakedown and pad bed in session, and session two was also wet. It appeared that everything was running fine, and the cooling system looked to be coping.
After it poured with rain at lunch the track went to clay again and the drying line had to slowly evolve. As the track dried out the coolant temps began to rise. It would appear that whilst better, the cooling system is still struggling to keep up. The issue appears to be getting a consistent seal on the radiator, as the system temp drops back to 88-90 degrees C as soon as you get out of the throttle for half a lap. I have had a look at quite a few cooling systems on more modern cars and am gathering the parts to convert mine to a remote header tank style. This will see the radiator sealed with a blanking cap, a remote header tank installed and the header tank plumbed back to the water pump inlet. This will essentially form a closed or sealed system where the ‘overflow reservoir’ is also pressurised and feeds directly back into the system.
I am off to scour the wreckers today for parts to make my new system.
