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Craig Williams (Craigw)
Junior Member
Username: Craigw

Post Number: 70
Registered: 4-2002
Posted on Monday, February 17, 2003 - 9:00 am:   

Hi Justin,
the total length of the straight was 2 miles. We were entering the straight from a long but reasonably tight right hand bend. Would estimate the timing equipment was about a mile and a bit down the straight. There was no time recording but I have it on camcorder so can check roughly.

All I can say is I've seen 155 indicated on the speedo before and it was nothing like that!(my speedo decided not to work on saturday)
Justin Randall Kenyon (Kenyon)
Junior Member
Username: Kenyon

Post Number: 95
Registered: 10-2002
Posted on Monday, February 17, 2003 - 8:14 am:   

Craig,

What was the distance for you to reach 155mph at 7000 rpm and was your time ?
Please respond
Craig Williams (Craigw)
Junior Member
Username: Craigw

Post Number: 69
Registered: 4-2002
Posted on Monday, February 17, 2003 - 6:49 am:   

thanks guys, I did take some out pre run. Car performed faultlessly, was quicker than all the normally aspirated 911's (bar one cheeky 996!), managed a max of 155mph at 7000rpm(recorded electronically) - amazing the difference between speedo readings and actual speed. Didn't overheat at all, no brake fade either.

Did have one scary moment when after a run someone (luckily) noticed petrol spewing out under the car, luckily it was just a bolt that needed tightening (no idea what it did but was near the top front of the engine bay & a large brass nut) Thanks again for all advice.
Philip Airey (Pma1010)
Junior Member
Username: Pma1010

Post Number: 124
Registered: 7-2002
Posted on Friday, February 14, 2003 - 8:16 pm:   

As you may know, peeing coolant over the track is a hazard and will get you pulled in. I used the 6cm rule with (factory rec) 50/50 and distilled water and on hot days will still spew coolant. Agree with Rob on mixture and level.
Philip
Rob Schermerhorn (Rexrcr)
Junior Member
Username: Rexrcr

Post Number: 231
Registered: 11-2002
Posted on Friday, February 14, 2003 - 7:32 pm:   

Craig, you will not "blow pipes" with an over full expansion tank. As the name states, the cooling system is designed for expansion and contraction as the coolant level fluctuates with pressure, temperature, and flow rates. Overfull, the worst that would happen is coolant "peeing" out the hose attached to the bung where the cap is, then to the ground. Now, if that overflow hit a rear tire at an inopportune time, that could be bad. I always just stuck my finger into the tank, and if I just hit water with the tip, all good.

I highly recommend pressure testing to 22 psi, letting sit overnight, find and fix what leaks, and installing a 20 - 22 psi cap. I also advocate filling with distilled water with no more than 15% anti freeze to improve heat transfer and heat capacity of the cooling system if your climate can take it, which in the UK, you can. Ethylene glycol specific heat capacity is less than water, hence the overall improvement when reducing the amount of anti freeze.
Philip (Phil_good)
New member
Username: Phil_good

Post Number: 15
Registered: 12-2002
Posted on Friday, February 14, 2003 - 2:31 pm:   

The workshop manual says 6 cm below the cap.
Craig Williams (Craigw)
Junior Member
Username: Craigw

Post Number: 67
Registered: 4-2002
Posted on Friday, February 14, 2003 - 6:55 am:   

thanks Justin, didn't fancy any blown pipes etc.
Justin Randall Kenyon (Kenyon)
Junior Member
Username: Kenyon

Post Number: 93
Registered: 10-2002
Posted on Friday, February 14, 2003 - 6:52 am:   

The level of coolant should be at the middle of the seam of the expansion tank. If slightly above should not be a problem. If not enough gap in the tank for the coolant to expand, then coolant will over flow out of the over pipe and level it self out to the proper level.
Craig Williams (Craigw)
Junior Member
Username: Craigw

Post Number: 65
Registered: 4-2002
Posted on Friday, February 14, 2003 - 6:37 am:   

Hi guys,

Further to an earlier post a few of us here in the UK have access to a runway tomorrow, 2 mile straight for high speed runs.

Have done all advised checks but had a question regarding coolant levels.

Just checked coolant level and seems to be about 3cms below the cap, is this too much to allow for expansion at high speeds ?

Cheers

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