The technical adventures of Dr_C

Cant really tell about the clutch, Taffy. I have never killed one... yet. Sometimes I put together an engine with the older version and sometimes with the newer.

I live in the very south of Sweden, so it is not so cold here. A month ago we had a new record regarding temperature difference from north to south of 40 degC.

Two radiators give almost the same cooling area as OEM, so sometimes I have to use a strip of tape across either one of them. But at the premiere it was overheated, so I need to reveal the primary cause of that.

The cylinder head is back from machining. The holes for the lifters had some scratches, so I went from 31mm to 32mm. I had to surf the internet a couple of hours to find that lifters for a Mitsubishi Evo X would fit my needs! Hopefully they will not be rejected after the transplant... Also the valve seals are taking a beating from the collets (high max lift), so I had the guides shortened 3mm to keep clear.

spanner said:

Hi Dr C what size valves in this DOHC head?

I suppose the valve angle is less than the 20 degree of the OEM head?

Are you expecting a start up soon?

Cheers spanner

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Inlets are 41mm and exhaust are 33mm. The total inclined angle is 21deg.

While waiting for new lifters I'm entertaining myself with knocking rust off the frame on my race bus... very fun, really...

Suppliers with prompt and correct delivery have earned some free advertising! Supertech got my valve lifters on the road just a couple of hours after my payment and now they have turned up here, in workshop!

spanner said:

Any progress Dr C???

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Not so much... I had to put some 70 hours into my "racing" bus (mobile home), but now the rust is gone (for now) and almost the whole frame have been epoxy coated.

However, I have ordered 2 sleeves from Westwood and having a discussion with JE on 2 new pistons. I'm also designing new holders for my brake calipers, as the old ones didn't place the pads well enough on the discs. And I have treated myself with a tricky multimeter https://moosh.im/ that communicate with my smartphone through Bluetooth and displaying values or graphs!

But part from that I have mostly been crawling around beneath my mobil home. Fun. Indeed.

72triple said:

Dr. C is freaking awesome. I sat through his build vids on Youboob last night. You sir are a mad man with the skills to pay the bills. "...no iridium spark plugs in this shop ever again." Bwahahhahh! With as much trial and tribulation that are involved in one-off hand built machines your demeanor is very neutral. I on the other hand would have been smashing parts and pieces to bits with the closest 10lb. micrometer that I could lay my hands on. Love you, you your show. Your passion and commitment are infectious. Keep them coming.

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Wow! What kind words, 72triple! I'm especially proud over superlatives as "a mad man"! I'll print your message out and stick it on the workshop wall!

I hope soon to return to the interesting stuff in the workshop. A cheering like yours is good fuel for that! Thanks!

When I got this fork, the caliper brackets were deformed. The former mechanic had mounted tapered washers inbetween the brackets and the fork to compensate... On a roadracing bike?! Come on! So I had new ones machined, just copying the measurements. After a while I got big problems with the brake lever activating closer to the handlebar after say half the session/race. When suddenly having to use the whole hand, instead of two fingers, is very disturbing and costed positions. I switched braking fluid, made sure no bubbles where trapped, switched braking lines, braking pump, pads and put new seals in the calipers. Eventually the problem returned every time. Then my good friend Allan from SBS Brakes pointed out an obvious problem to me! The pads where not properly placed on the discs, so a tiny bit of the pad was outside of the disc! So after the pad got a little worn, the thermal expansion of the disc pushed the pads apart. That made the elonged stroke of the braking lever when the disc got hot! Why didn't I notice that myself?

Anyways, designing new brakets that ensure proper alignment was not as simple as one might think. I just had to CAD some mockups, having the machinist drill them, mount and test alignment. This is the third mockup, and now its close...

bushmechanic said:

love the deadly honest technical terminology Dr_C!

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I believe my poor english is a bad combination with your dirty mind?

Haha! I'd better be more careful... with my fingers.... on the keybord! [emoji6]