The technical adventures of Dr_C

Dr_C · Oct 19, 2014

I'm starting a new thread here, as the old one has become very large and seems impossible to move from the market place. I have actually got some attention from the forum Forums - www.Motorcyclebuilders.net - You build it.. We show it to the world! as you can see here: The Husaberg DRC680 - www.Motorcyclebuilders.net - You build it.. We show it to the world!

Fun and feeds my latent narcissism! [emoji1]

tourist · Oct 19, 2014

Fun read!

I don't think I had actually seen the head before. It's beautiful!

What EFI system did you use?

Dr_C · Oct 19, 2014

tourist said:
Fun read!

I don't think I had actually seen the head before. It's beautiful!

What EFI system did you use?

Thanks, Ferðamaður!
I'm using a Megasquirt III system, Ducati 1198 throttle body and injector.

bushmechanic · Oct 19, 2014

Excellent DR C, thanks for taking the time

not sure why they don't think the coffee percolator crank vent is the cutting edge of the project

Dr_C · Oct 19, 2014

bushmechanic said:
Excellent DR C, thanks for taking the time

not sure why they don't think the coffee percolator crank vent is the cutting edge of the project

Beats me too! Specially considering all that engineering and fabricating involved with it!

Dr_C · Oct 25, 2014

Today some plumbing with the coolers!

Dr_C · Oct 31, 2014

If you don't have access to fancy tools making the necessary thickening on the cooling stub, a weld will have to do! Make sure there is enough piece of straight tube to fixate it in the lathe. Voila!

tourist · Oct 31, 2014

Problem-solving is fun.

I'm really curious about the EFI conversion. Did you have a timing wheel machined for the flywheel? Easy fit? How is the cam sensing done? (Is there only one canonical way to do that. .?)

Dr_C · Nov 1, 2014

tourist said:
Problem-solving is fun.

I'm really curious about the EFI conversion. Did you have a timing wheel machined for the flywheel? Easy fit? How is the cam sensing done? (Is there only one canonical way to do that. .?)

Thats a novel right there... "Conversion" gives you the wrong idea. Development and manufacturing is more realistic! [emoji6]
The trigger is on the upper cam chain wheel and comes from one tooth only. I used a visual indication of TDC (on the flywheel) to calibrate the position of TDC against the tooth, which was done in the software. I have no sensor on the flywheel. Oh, no flywheel either for that matter!

Dr_C · Nov 3, 2014

The lousy machinist in my workshop, probably the same b-stard that misplaces my tools all the time, managed not to get the cylinder sleeve flange square. So I had to machine a shaft to put the sleeve on, just to shave off 0,04mm to make the flange square and equally thick. Hm. I do not seem to have any problems keeping myself busy...

berglsmerg · Nov 3, 2014

Is this b-stard the same person who makes trouble with beer and firecrackers Mats ?

bushmechanic · Nov 3, 2014

nice Dr_C

I had to do the same to put a groove in the top surface of my liner for a guitar string.

I'm curious if you found any contact between the big end OD and the cases and how much clearance seems to be necessary.

do we have the same problem Bergsmlerg ? .. that bastarto who steals the firecrackers must be the same one

Dr_C · Nov 4, 2014

berglsmerg said:
Is this b-stard the same person who makes trouble with beer and firecrackers Mats ?

The very same! A real pain sometimes but he´s the only one working for free in this project. Otherwise I would have canned him long time ago...

Dr_C · Nov 4, 2014

bushmechanic said:
nice Dr_C

I had to do the same to put a groove in the top surface of my liner for a guitar string.

I'm curious if you found any contact between the big end OD and the cases and how much clearance seems to be necessary.

do we have the same problem Bergsmlerg ? .. that bastarto who steals the firecrackers must be the same one

On old drag racing trick! I use a fabric thread in this engine to keep compression on the head gasket, to prevent coolant from leaking! Very "high tech"!

No contact at all! I think I had about 0,5-1,0 mm clearance. Can't check that until my liner is back from... "honing"?

bushmechanic · Nov 4, 2014

interesting idea!

ive been eying off an old roll of wax coated kite string since i read that

tourist · Nov 4, 2014

firecracker fuse is best

re. the FI - very interesting!, so do I get this right, the sensor on the cam is all the timing data that the ECU gets for ignition and fueling? at any rate the fi must have been fun to solve, very interesting to think about at least

Dr_C · Nov 6, 2014

tourist said:
firecracker fuse is best

re. the FI - very interesting!, so do I get this right, the sensor on the cam is all the timing data that the ECU gets for ignition and fueling? at any rate the fi must have been fun to solve, very interesting to think about at least

Yes, one trigger for both fuel and ignition on the cam (well, same rev at least). That means no wasted spark (higher energy available, less power consumtion). Flip side could be less accurate ignition on low revs (varying speed during one cycle), but I do not operate much in that region... :happy:

tourist · Nov 6, 2014

!interesting! ... thanks

Maybe this is all covered in the previous thread? I skimmed but didn't find info - but I wanted to ask what sensors you have?

I'm doing a gedankenexperiment on updating my DR-Z to 2000's EFI technology

Dr_C · Nov 6, 2014

tourist said:
!interesting! ... thanks

Maybe this is all covered in the previous thread? I skimmed but didn't find info - but I wanted to ask what sensors you have?

I'm doing a gedankenexperiment on updating my DR-Z to 2000's EFI technology

I purchased most of the equipment and sensors from MegaSquirt | Engine Management System | Electronic Fuel Injection - DIYAutoTune.com
That's one safe way of ensuring everything works together. The cam sensor is a normal Hall effect sensor, which I bought from: https://www.elfa.se/elfa3~se_sv/elfa/init.do?item=73-490-38&toc=19236

Dr_C · Nov 8, 2014

How would you suggest I connect my coolers? Parallel/in series, flow direction?

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