Running M44 build!

[benz-tech]

I'm sure there's just a burr on there as well. I would never grind down the guides on the exhaust guides or on any engine with rockers. Since these have buckets and there is zero side loading of the valve, I feel pretty comfortable with it. Removing them really makes to port look a lot bigger, as does being shinny but yeah mostly just a clean-up.

[benz-tech]

Small update. Block and pistons are back, just measured the crank and painted the block. All the mains are right at  .0017" with the orig bearings. Ill need to see what the actual specs are. De-burring the guides fixed the issue. They are nice and smooth now.

[jrw21]

Looks good. What type of paint did you use on the block?

[benz-tech]

A 3-year-old can that I used when I built my Datsun engine. I can get the brand for you. Probably back when paint was actually paint.

[benz-tech]

Making sure the valves and pistons have enough clearance. The intake has .160" or around 4mm at tdc. Even If I get some huge cam with 2mm lift at tdc I should still be ok. I still need to cut exh valve reliefs since I had no idea where they went after decking the pistons and they only sit at .105". Once the final cut is made on them, it's off to the balancer. I still need to look up the spec for valve-to-piston clearance before heading back to the endmill.

[wazzu70]

Valve to piston minimum is around 1mm I believe. I need to look it up again.

Either way, you have acres of room!

[benz-tech]

I just read the same on MM's site. 1.0mm min and preferably 1.5mm. I should be right there. Update: head went to the machine shop to be pressure tested and have the exh valves faced a bit. I will finish smoothing the ports and grind the seats when I get it all back.

[benz-tech]

Head is all done, surfaced and a 4-angle valve job. I would have done 5 angles but there is just not enough room to put a 15* on the top. The intake cam is out to get reground, I'm just not sure by whom. I'm also having trouble getting an exact measurement on the combustion chamber. Sometimes it comes out 33, sometimes it's 35cc. It just depends on the mood of my syringe.

[jrw21]

Head looks good. Funny I think I have cc'd it half a dozen times and got between 33 and 35 each time.

[benz-tech]

I just did it 3 more times and got right around 33 each time. That puts me at 11.6:1. I'd like it just a but lower so it will be back to the end mill to take some more out of the pistons.

[wazzu70]

Looking good!!

[Warsteiner]

33 for me too....

Cheers,
~Ralph

[benz-tech]

It's been a long time since my last update. It's frustrating to be so tight on dough. Funds should be freed up here soon so expect this to move forward. The latest done is the rods, pistons, crank, 12.5 lb flywheel and PP are all back from the balancer. I made 360* main bearings by cutting a groove all around the lower shell. Maybe not as good as orig 360s but better than nothing. I have yet to make contact with Steve at TEP to get total seal rings lined up. Still need HG kit and intake cam reground. I will get some pics later this week. I will prob swap parts in in stages starting with the flywheel/clutch so that I can mock up the g250 to get the linkage and drive shaft worked out first.

[ispierrot]

 

Hi, I'm trying to finish a M42 with piston europe S50 and crank  M44, could you put a picture of the head of your US piston.

 Thank you.

[benz-tech]

538g rods. 448g pistons. I don't have any stock M42 stuff laying around but they are both a good amount lighter. Final static compression ratio is 11.3:1.  If anyone has suggestions on where to get rings and who could regrind an intake cam in expensively.