I haven't posted on my engine for a long time, so due an update:
- Pinnacle of last year for the new engine was a 13.59 at Santa Pod
- Over the last winter, I've been getting a new head together - it's a P90 with porting & modified combustion chamber and a big cam.
- I also rebuilt an FS5W71C gearbox with a quickshift that I fitted over the Winter.
A couple of random photos - first the ports. I had the waterways tapped on 5 & 6 so I can later improve the cooling flow from the back end of the head.
And I also added a Kameari crank damper, 'cos it's going to rev a LOT more with this head
I put it together a couple of weeks ago. I hadn't got too far with (the carb equivalent of) mapping it before the diff died - hence my classified for a new R200 diff.
Over this weekend, I prepared the new diff, got the propshaft balanced by Bailey Morris and fitted it all.
I went for a test drive on Saturday and the vibration and noises from the diff & prop are all gone. I ran it up to 8000 a couple of times too which went well
Just as I got home, the rad sprang a like and it was misfiring a bit. The electric fan had worn a hole in the rad - so I've soldered that up and gone back to the viscous fan for now.
I pulled the spark plugs and they were not looking their best:
Some of the tips have melted
so that's where the weekend fun stopped.
I hope there's no serious damage - I've ordered some colder plugs. I'll retard the ignition timing a few degrees next weekend and see how it is, and build back up the revs, checking the plugs regularly.
Next up? stop melting plugs, get the fuelling right, go to Le Mans Classic, get a new exhaust manifold from Sean, get the fuelling right again, go to Northampton Motorsport for some time on the rolling road to optimise and see what it produces (and maybe Santa Pod along the way too).
I should also thank pmac & skiddell for their help. If it works well, it's down to them (and Phil who built it). if it doesn't work well, it'll be down to me