54 and 65 in Australia

[Willa]

Sorry for the bad picture,
The oil goes in at no 1 and no 4 through the gallery and returns through the middle ( where the oil usually goes into the engine) The engine has great oil pressure and flow. Also I have additional modifications to assist with flow and pressure.
Cheers
Willa.

[dakazman]

  Willa , Thanks for this thread. I have been following it for some time but staying focused on getting my original motor running. I’m getting plenty of ideas here for my other 821. You have a very clean layout that I love studying in your pics. Keep posting.
Dakazman

[StephenH]

So what I thought was going to take a month has taken 6.....

They look worth the wait Willa.

[MRN I J]

Did you ever dyno test the last engine Willa ?

[Willa]

Hi MRN,

We went to dyno, had issues so pulled the yeah off to check everything and discovered one of the exhaust valve seats had collapsed into the head. It did this because of the porting and softish material that the head is made of, unfortunately because of this the head is unusable..... so we are back to creating a new head then back to the dyno. The new head will have the chamber welded up to increase the compression to 11.5:1 or possibly 12:1 rather than shaving the head which is what we did on the old one. The pistons I have chosen are slightly dished which is counterintuitive for achieving compression and the reason the chambers need welding to get the desired result. We are about 4 weeks away from finishing and being able to dyno. I will share the results when available, hoping for a bit more than the previous set up with reliability.
Cheers
Willa

[MRN I J]

Sorry to hear about that head, if you weld you may have to heat treat the new head after welding as it often softens the heads.
Will be interested to hear how you get on.

[Willa]

Here is a picture of the cylinder head,
Just starting the chamber welding, then rough cut seats, guides, porting, flow testing ..... more porting? we are using 7mm stems on both the intake and exhaust valves. We will fill any holes and clean up the gasket face then assemble with light springs to test and mate the cam and lifters, fit the proper springs, check and dyno. Hoping for good results??

Cheers,
Willa.

[GavinT]

That looks like a nice job, Willa.
I'd love to see it when the chambers have been reshaped.

[MRN I J]

has it distorted much from the welding ?