Ok,thanks...

thanks Kev,

will let you know if I get stuck!

cheers.
marcel

calculating the compressio ratio (CR)
 

In order to calculate the Cr, you need to measure the volume of the combustion chamber (Vc), the minimum volume of space into which the fuel and air is compressed prior to ignition.

Measured the Vc of the tuned head with a burret.
The result: 57 ccm3
Next is to measure the space above the 103mm piston on top of its stroke. Add this result to the 57 and we know the total Vc. After this we can start calculating the CR.

To be continued...

Ola Marjani,

Nice project you have going on, i am thinking about the 727 conversien.

Regards from Holland,

Ren�

Engine removal finally finished
 

after spending a few hours in my garage I finally removed the engine.
I can tell you it's a hell of a job! You have to remove so many parts in order to finally remove the engine. A good thing about this is that you can clean the parts perfectly.
Also found out that 2 main engine screws were loosen up, after appr. 6.000 kms. So it's a good thing to check all screws with a torque wrench from time to time.

Next thing is to remove the oem head and cylinder.

Well Rene,

That's good news, the more conversions we do, the more we get to know about this engine.
Keep us informed.
Thanks.

Marcel

piston to valve clearance/Compression Ratio
 

Measured the piston to valve clearance. Used a Cometic base and the oem head gasket. The results: 1,3 mm on the intake and 2,1 on the exhaust valves. According to OTR the piston to valve clearance should not exceed 1,2mm intake and 1,7 exhaust.

So that should be okay. Also the OEM gasket is 1,0 mm (unused)/ 0,85mm (used) and the Cometic is 1,4 mm (unused) and 1,0 mm (used/ approximately
). Because finally I will use a Cometic gasket, the clearance should be okay for sure.
I used play-doh clay (tip by Kev).

Also now I know what the Cr will be. According to the result of the measurements, the Cr will be around 1:11,3. Assuming the Cometic gasket will shorten from 1,4mm to 1,0mm. It was difficult to measure the space above the piston using the Burret, but I finally did it. It's not much, only about 2,7 ml. That's not much, though expected because of the dome.

Still waiting for some parts comming out of the US, so have to wait patiently again. Will keep you all informed.

Greetings from Holland,

Marcel

Nice work.

You need to also mention that your cylinder head face was machined by an unknown amount by Off The Road & you needed to measure all the above measurements to make sure you have a safe build.

Well done mate.

Kev is right, forgot to mention that. If I've got the time I will measure the OEM head so we can compare the volumes.

Red Bull Starter Motor
 

I created a RB starter motor, which injects pure taurine into the engine to give it wings!