When he's finished helping Russ, he's going to build his own 40.
KB
Not only that, he's also got another interesting and complex project lined up. Which is why he's so anal at getting perfect castings for the GT40. They are just a trial run before he attempts something much more difficult and involved.....
Russ is definitely very lucky.
KB
Nah. It's not luck, it's good management! I started him off on small seemingly harmless doses of motor racing but now the euphoric highs have got him and he's just like the rest of us with a fully fledged addiction!!
He took the day off work today to be at the dyno session too!
Well I fell on my feet with the dyno operator! He came up through drag racing in his younger days so really knew his way round four barrel carbs then went to Europe and was a spanner man for F2. Absolutely top notch! For any local guys, I highly recommennd Gary at P.A.D Racing.
The miss that I have been looking for never actually manifested itself on the dyno though, however there were three variables. I fitted a new set of plugs the night before, the motor was running a lot hotter than at the track, the rear clip was not in place. So it will be interesting to see how it goes on Sunday!
Had a bit of drama on the first few pulls which were each prematurely terminated when the oil pressure dropped to 25psi at WOT at high revs! That's a worry! Tried to visualise what in the motor or oil system could be causing this problem but to no avail. Added another couple of litres of oil and cranked up the relief valve to see if it would make any difference, but no. Getting this thing up and running is revealing one problem after another....It must end soon...!
Could it be the gauge? In days gone by I have clutched to this straw only to find that the motor concerned is invariably well and truly poked! Worth a try though, fitted a mechanical gauge and instantly got 75psi at WOT. Instant relief.
So the dyno program back on full song! Gary rejetted the carb a few times, drilled out a few passage ways in the metering block and eventually got a consistent AF ratio all the way through the rev range. Then we played with the spark and found 30° gave the best results. 2° either side producing a small intermitent misfire.
So a fairly full on day, all day on the dyno. I really learnt a lot and would never have been able to achieve these results left to my own devices track testing. So all good.
First pic is Lims adaptors all bolted up
Second pic, the whole setup and Gary on a mission.
Third and 4th pics with additional mufflers which were used for all but the last few pulls and blower ducting to the oil cooler.